View source for User:SounderBruce/Sandbox/Interstate

{{User:SounderBruce/Sandbox/Template}}

*[https://www.worldcat.org/search?q=official+opening+au%3AWashington+%28State%29.+Department+of+Highways.&qt=results_page WorldCat documents] with opening dates
*[https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll1/id/5955/rec/2 WSD
OT Highway News] (1962 progress)
*[https://digital.osl.state.or.us/islandora/object/osl%3A302568#page
/158/mode/1up Oregon bibliography] (newspaper article index)
*[https://apps.itd.idaho.gov/apps/mediamanagermvc/transporter/archivesindex.html Idaho Transporter] (vault articles)
*[https://www.newspapers.com/clip/22212056/washington_limited_access_highway_plan/ 1953 Washington limited access highway plan]

=Status=
{| class="wikitable sortable" style="text-align:center"
|-
! Route
! Class
! Priority
! RD
! History
! Exits
! Images
! Other
|-
| align=left | {{jct|state=WA|I|5}} (WA) || {{yes|GA}} || {{yes|High}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}} || {{maybe|Doing}} || {{N/A}}
|-
| align=left | {{jct|state=WA|I|82}} (OR/WA) || style="background:#ADD8E6" | FA || {{yes|High}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}} || {{N/A}}
|-
| align=left | {{jct|state=WA|I|90}} (WA) || B || {{yes|High}} || {{yes|Done}} || {{no|Not Done}} || {{yes|Done}} || {{no|Not Done}} || {{N/A}}
|-
| align=left | {{jct|state=WA|I|182}} (WA) || style="background:#ADD8E6" | FA || {{maybe|Mid}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}} || {{N/A}}
|-
| align=left | {{jct|state=WA|I|205}} (OR/WA) || style="background:#ADD8E6" | FA || {{yes|High}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}}
|-
| align=left | {{jct|state=WA|I|405}} (WA) || C || {{yes|High}} || {{yes|Done}} || {{no|Not Done}} || {{yes|Done}} || {{no|Not Done}} || {{yes|Done}}
|-
| align=left | {{jct|state=WA|I|605}} (WA) || {{yes|GA}} (old) || {{no|Low}} || {{no|Not Done}} || {{no|Not Done}} || {{N/A}} || {{N/A}} || {{N/A}}
|-
| align=left | {{jct|state=WA|I|705}} (WA) || {{yes|GA}} (old) || {{no|Low}} || {{yes|Done}} || {{no|Not Done}} || {{yes|Done}} || {{no|Not Done}} || {{N/A}}
|-
| align=left | {{jct|state=OR|I|5}} (OR) || C || {{maybe|Mid}} || {{yes|Done}} || {{no|Not Done}} || {{no|Not Done}} || {{no|Not Done}} || {{N/A}}
|-
| align=left | {{jct|state=OR|I|84}} (OR) || C || {{maybe|Mid}} || {{yes|Done}} || {{no|Not Done}} || {{no|Not Done}} || {{no|Not Done}} || {{N/A}}
|-
| align=left | {{jct|state=OR|I|105}} (OR) || Redirect || {{no|Low}} || {{no|Not Done}} || {{no|Not Done}} || {{no|Not Done}} || {{no|Not Done}} || {{N/A}}
|-
| align=left | {{jct|state=OR|I|305}} (OR) || Redirect || {{no|Low}} || {{no|Not Done}} || {{no|Not Done}} || {{N/A}} || {{no|Not Done}} || {{N/A}}
|-
| align=left | {{jct|state=OR|I|405}} (OR) || {{yes|GA}} || {{maybe|Mid}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}} || {{N/A}}
|-
| align=left | {{jct|state=OR|I|505}} (OR) || Redirect || {{no|Low}} || {{no|Not Done}} || {{no|Not Done}} || {{N/A}} || {{no|Not Done}} || {{N/A}}
|-
| align=left | {{jct|state=ID|I|15}} (ID) || Start || {{no|Low}} || {{no|Not Done}} || {{no|Not Done}} || {{no|Not Done}} || {{no|Not Done}} || {{N/A}}
|-
| align=left | {{jct|state=ID|I|84}} (ID) || C || {{maybe|Mid}} || {{yes|Done}} || {{no|Not Done}} || {{no|Not Done}} || {{no|Not Done}} || {{N/A}}
|-
| align=left | {{jct|state=ID|I|86}} (ID) || {{yes|GA}} || {{maybe|Mid}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}} || {{yes|Done}} || {{N/A}}
|-
| align=left | {{jct|state=ID|I|90}} (ID) || C || {{maybe|Mid}} || {{yes|Done}} || {{no|Not Done}} || {{no|Not Done}} || {{no|Not Done}} || {{N/A}}
|-
| align=left | {{jct|state=ID|I|184}} (ID) || C || {{maybe|Mid}} || {{yes|Done}} || {{no|Not Done}} || {{no|Not Done}} || {{no|Not Done}} || {{N/A}}
|}

=50-ish States Project=

{| class="wikitable sortable" style="text-align:center"
|-
! State !! Route !! Class !! Priority !! Difficulty !! class=unsortable | Sources
|-
| AL || align=left | 
|-
| AK || align=left | 
|-
| AZ || align=left | {{jct|state=AZ|I|17}} || Start || Low || Mid || {{maybe|some NP}}
|-
| AR || align=left | {{jct|state=AR|I|630}} || Start || Low || Mid || {{N/A}}
|-
| CA || align=left | {{jct|state=CA|I|505}} || {{maybe|C}} || Mid || Mid || {{yes|NP}}
|-
| CO || align=left | 
|-
| CT || align=left | 
|-
| DE || align=left | 
|-
| DC || align=left | 
|-
| FL || align=left colspan=5 | {{jct|state=FL|I|175}} or {{jct|state=FL|I|375}}
|-
| GA || align=left | 
|-
| '''HI''' || align=left | {{jct|state=HI|I|2}} || {{yes|GA}} || Done || Done || {{yes|NP}}
|-
| ID || align=left | {{jct|state=ID|I|184}} || Start || High || Mid || {{maybe|Waiting}}
|-
| IL || align=left | 
|-
| IN || align=left | 
|-
| IA || align=left | 
|-
| KS || align=left | 
|-
| KY || align=left | 
|-
| LA || align=left | 
|-
| ME || align=left | 
|-
| MD || align=left | 
|-
| MA || align=left | 
|-
| MI || {{N/A}}
|-
| MN || align=left | 
|-
| MS || align=left | 
|-
| MO || align=left | 
|-
| MT || align=left | {{jct|state=MT|I|115}} || Start || Low || Mid || {{yes|NP}}
|-
| NE || align=left | {{jct|state=NE|I|180}} || {{yes|GA}} || Done || Done || {{N/A}}
|-
| NV || align=left | {{jct|state=NV|I|515}} || Start || Low || Mid || {{yes|NP}}
|-
| '''NH''' || align=left | {{jct|state=NH|I|95}} || C || High || Mid || {{yes|NP}}
|-
| NJ || align=left | 
|-
| NM || align=left | 
|-
| NY || align=left | 
|-
| NC || align=left | {{jct|state=NC|I|240}} || Start || Low || Mid || {{yes|NP}}
|-
| '''ND''' || align=left | {{jct|state=ND|I|194}} || Start || High || || {{yes|NP}}
|-
| OH || align=left | 
|-
| OK || align=left | 
|-
| OR || align=left | {{jct|state=OR|I|405}} || {{yes|GA}} || Done || Done || {{N/A}}
|-
| PA || align=left | 
|-
| '''PR''' || align=left | 
|-
| RI || align=left | 
|-
| '''SC''' || align=left | {{jct|state=SC|I|126}} || C || Mid || Mid || {{yes|NP}}
|-
| '''SD''' || align=left | {{jct|state=SD|I|229}} || {{yes|GA}} || Done || Done || {{yes|NP}}
|-
| TN || align=left | 
|-
| TX || align=left | 
|-
| UT || align=left | 
|-
| VT || align=left | 
|-
| VA || align=left | 
|-
| WA || align=left | {{jct|state=WA|I|5}} || {{yes|GA}} || Done || Done || {{N/A}}
|-
| WV || align=left | 
|-
| WI || align=left | 
|-
| WY || align=left | {{jct|state=WY|I|180}} || Start || Mid || || {{yes|NP}}
|}

=[[List of Interstate Highways in Washington]]=

==Business routes==

*Not managed by WSDOT
*Not numbered by AASHTO<ref name="AAHSTO-2013-BL90"/>

{{routelist top|length_ref=}}
{{routelist row
|state=WA
|type=BL
|route=5
|dab=Vancouver
|sortkey=0005a
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|decommissioned=?
|decommissioned_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BL
|route=5
|dab=Castle Rock
|sortkey=0005b
|length_mi=
|length_ref=
|terminus_a={{jct|state=WA|I|5|noshield=yes}} near Castle Rock
|terminus_b={{jct|state=WA|I|5|SR|411|SR|504|noshield=yes}} in Castle Rock
|established=
|established_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BL
|route=5
|dab=Chehalis–Centralia
|sortkey=0005c
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|decommissioned=?
|decommissioned_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BL
|route=5
|dab=Olympia
|sortkey=0005d
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|decommissioned=?
|decommissioned_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BL
|route=5
|dab=Fife–Midway
|sortkey=0005e
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=1962
|established_ref=
|decommissioned=1970
|notes=Now part of [[Washington State Route 99|SR 99]]
}}
{{routelist row
|state=WA
|type=BL
|route=5
|dab=Everett–Marysville
|sortkey=0005f
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|decommissioned=?
|decommissioned_ref=
|notes=Now part of [[Washington State Route 529|SR 529]]
}}
{{routelist row
|state=WA
|type=BL
|route=5
|dab=Bellingham
|sortkey=0005g
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|decommissioned=?
|decommissioned_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BL
|route=82
|dab=Yakima
|sortkey=0082a
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|decommissioned=?
|decommissioned_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BL
|route=82
|dab=Sunnyside
|sortkey=0082b
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|decommissioned=?
|decommissioned_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BL
|route=90
|dab=Cle Elum
|sortkey=0090a
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|decommissioned=?
|decommissioned_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BL
|route=90
|dab=Ellensburg
|sortkey=0090b
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BL
|route=90
|dab=Moses Lake
|sortkey=0090c
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BS
|route=90
|dab=Ritzville
|sortkey=0090d
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BL
|route=90
|dab=Spokane
|sortkey=0090e
|length_mi=
|length_ref=
|terminus_a=
|terminus_b=
|established=
|established_ref=
|decommissioned=?
|decommissioned_ref=
|notes=none
}}
{{routelist row
|state=WA
|type=BL
|route=90
|dab=Spokane Valley
|sortkey=0090f
|length_mi=8.21
|length_ref=<ref name="AAHSTO-2013-BL90"/>
|terminus_a=
|terminus_b=
|established=2013
|established_ref=<ref name="AAHSTO-2013-BL90"/>
|notes=none
}}
{{routelist bottom|keys=former}}

==References==
{{reflist}}

=[[Interstate 90]]=

==Route description==

===AADT by state===

:National source: [https://www.fhwa.dot.gov/interstatebrief2011/2011interstatebrief.pdf FHWA, August 2013] (also includes VMT)
{| class="wikitable sortable"
|-
! State !! Section !! Count !! class=unsortable | Notes
|-
| [[Interstate 90 (Washington)|Washington]]
| Eastgate, Bellevue
| 150,000
| 2016 data
|-
| [[Interstate 90 (Washington)|Washington]]
| SR 21 near Ritzville
| 11,000
| 2016 data
|-
| [[Interstate 90 (Idaho)|Idaho]]
| Huetter
| 60,729
| 2017 data
|-
| [[Interstate 90 (Idaho)|Idaho]]
| Mullan
| 7,861
| 2017 data
|-
| [[Interstate 90 (Montana)|Montana]]
| Billings
| 30,116
| [https://mdt.mt.gov/other/webdata/external/Planning/TRAFFIC_MAPS/2019_FLOW_MAP.PDF 2019 data]
|-
| [[Interstate 90 (Montana)|Montana]]
| South of Crow Agency
| 3,816
| 2019 data
|-
| [[Interstate 90 (Wyoming)|Wyoming]]
| Highway 336, Sheridan
| 5,413
| [https://www.dot.state.wy.us/files/live/sites/wydot/files/shared/Planning/VMB/2020VMBpdf.pdf 2020 data]
|-
| [[Interstate 90 (Wyoming)|Wyoming]]
| Crazy Woman Creek Road
| 1,506
| 2020 data
|-
| [[Interstate 90 (South Dakota)|South Dakota]]
| East of I-190, Rapid City
| 35,130
| [https://dot.sd.gov/media/documents/Traffic_2020.pdf 2020 data]
|-
| [[Interstate 90 (South Dakota)|South Dakota]]
| Between SD-63 and US 83, Murdo
| 6,250
| 2020 data
|-
| [[Interstate 90 (Minnesota)|Minnesota]]
| 
| 
| 
|-
| [[Interstate 90 (Wisconsin)|Wisconsin]]
| 
| 
| 
|-
| [[Interstate 90 (Illinois)|Illinois]]
| 
| 
| 
|-
| [[Interstate 90 (Indiana)|Indiana]]
| 
| 
| 
|-
| [[Interstate 90 (Ohio)|Ohio]]
| 
| 
| 
|-
| [[Interstate 90 (Pennsylvania)|Pennsylvania]]
| 
| 
| 
|-
| [[Interstate 90 (New York)|New York]]
| 
| 
| 
|-
| [[Interstate 90 (Massachusetts)|Massachusetts]]
| 
| 
| 
|}

;FHWA 2011

{| class="wikitable sortable"
|-
! State !! Type !! Count
|-
| WA || Mean Rural || 23,311
|-
| WA || Max Rural || 61,726
|-
| WA || Mean Urban || 77,888
|-
| WA || Max Urban || 140,767
|-
| ID || Mean Rural || 10,847
|-
| ID || Max Rural || 15,000
|-
| ID || Mean Urban || 40,352
|-
| ID || Max Urban || 51,500
|-
| MT || Mean Rural || 8,152
|-
| MT || Max Rural || 23,650
|-
| MT || Mean Urban || 19,915
|-
| MT || Max Urban || 28,920
|-
| WY || Mean Rural || 5,313
|-
| WY || Max Rural || 9,820
|-
| WY || Mean Urban || 8,032
|-
| WY || Max Urban || 9,969
|-
| SD || Mean Rural || 8,410
|-
| SD || Max Rural || 22,680
|-
| SD || Mean Urban || 21,565
|-
| SD || Max Urban || 34,850
|-
| MN || Mean Rural || 10,247
|-
| MN || Max Rural || 20,400
|-
| MN || Mean Urban || 14,175
|-
| MN || Max Urban || 26,500
|-
| WI || Mean Rural || 28,955
|-
| WI || Max Rural || 36,421
|-
| WI || Mean Urban || 24,868
|-
| WI || Max Urban || 40,739
|-
| IL || Mean Rural || 45,902
|-
| IL || Max Rural || 45,902
|-
| IL || Mean Urban || 202,907
|-
| IL || Max Urban || 306,574
|-
| IN || Mean Rural || 0
|-
| IN || Max Rural || 0
|-
| IN || Mean Urban || 34,266
|-
| IN || Max Urban || 36,713
|-
| OH || Mean Rural || 28,184
|-
| OH || Max Rural || 37,730
|-
| OH || Mean Urban || 84,013
|-
| OH || Max Urban || 145,340
|-
| PA || Mean Rural || 17,208
|-
| PA || Max Rural || 33,040
|-
| PA || Mean Urban || 25,625
|-
| PA || Max Urban || 33,040
|-
| NY || Mean Rural || 27,533
|-
| NY || Max Rural || 39,000
|-
| NY || Mean Urban || 53,377
|-
| NY || Max Urban || 137,200
|-
| MA || Mean Rural || 33,512
|-
| MA || Max Rural || 95,323
|-
| MA || Mean Urban || 79,524
|-
| MA || Max Urban || 131,125
|}

==History==

*Auto trail predecessors
**Yellowstone Trail from Seattle
**National Parks Highway
**Black and Yellow Trail (est. 1919)<ref>https://www.southdakotamagazine.com/old-highway-16</ref>

*Predecessors map?
*Decommissioning timeline:
**June 1969: US 10, Seattle to Spokane only
**June 1975: US 10, Spokane to Coeur d'Alene
**July 1977: US 10, Coeur d'Alene to US 93 near Missoula
**June 1986: US 10, Missoula to West Fargo, ND

;Tollway and expressway plans
*1941: Illinois plans, later delayed due to war
**1954: Calumet Skyway (now Chicago Skyway) approved, began construction in 1956<ref>HAER report</ref>
*1942: New York Thruway approved (NYC to Buffalo to PA), construction began in 1946<ref>https://www.thruway.ny.gov/oursystem/toll-collector-history.html</ref><ref>https://www.thruway.ny.gov/about/financial/bond/sales/2011a-bans.pdf</ref>
**1944: Berkshire Thruway approved, construction began in 
*1949: Plan approved for Ohio, began construction in 1952
**Parallel, toll-free highway planned for I-90 (including cancelled Parma Freeway), built in parts as SR 2 before plan abandoned
*1951: Plan approved for Indiana, began construction in 1954<ref>https://web.archive.org/web/20170623213751/http://articles.southbendtribune.com/2006-01-22/news/26998259_1_indiana-toll-road-route-lagrange-county</ref>
*Pennsylvania plan cancelled

;Construction notes
*House Bill 14359, signed into law in September 1966: All Interstates to be built to four lanes, requiring later expansion in Montana and other states?<ref name="MT"/>

;Designation history
*1958 plan: Interstate 90W for Niagara extension of Thruway<ref>{{cite news |date=October 21, 1958 |title=Interstate Roads Get Designations |page=37 |url=https://www.nytimes.com/1958/10/22/archives/interstate-roads-get-designations.html |work=The New York Times |agency=Associated Press |accessdate=}}</ref>
*circa 1965: I-94 moved from Chicago Skyway to southern Tri-State (Kingery) Expressway through Hammond, I-90 moved north and fully covers Indiana Toll Road<ref>https://indianamemory.contentdm.oclc.org/digital/collection/p15078coll8/id/1126/rec/1</ref><ref>https://indianamemory.contentdm.oclc.org/digital/collection/p15078coll8/id/1128/rec/1</ref>
**Proposed by Indiana in 1964 to reduce signage confusion and congestion<ref>https://na4.visualvault.com/app/aashto/default/vvlogin?token=ea1551ad-d854-ec11-a9f9-a7fbceea2193&returnurl=documentviewer%3fDhID%3d6b0bdffb-c6d5-ea11-a98a-ff9beffbfef8%26hidemenu%3dtrue</ref>

*July 6, 1977: IL relocation to Northwest Tollway approved; I-290 created from old alignment?
*1990: MA requests I-90 extension on Turnpike from Allston/Brighton to I-93 despite not meeting Interstate standards (11-foot lanes, narrow shoulders, short clearance)<ref>https://na4.visualvault.com/app/aashto/default/vvlogin?token=ea1551ad-d854-ec11-a9f9-a7fbceea2193&returnurl=documentviewer%3fDhID%3d08365d46-54e6-ea11-a98a-ff9beffbfef8%26hidemenu%3dtrue</ref>
**Until 1970s, I-90 was unsigned on Pike east of Allston<ref>https://www.arcgis.com/home/group.html?id=7e4965ef9cc84e91a08ecc7d0ddfc859&view=list&start=21&num=20#content</ref>
*Chicago Skyway standards: Signage removed in 1999 due to confusion over official designation after switch from I-94<ref>https://web.archive.org/web/20080922090915/http://tollroadsnews.info/artman/publish/article_969.shtml</ref>

===Major projects===
{| class="wikitable sortable"
|-
! State !! Section !! Date finished !! class=unsortable | Notes
|-
| Washington
| Spokane Valley (Havana to Pines)
| {{dts|1956|11}}
| First section in state
|-
| Washington
| [[Vantage Bridge]]
| {{dts|1962|11}}<ref>https://www.newspapers.com/clip/76754835/new-bridge-on-columbia-is-dedicated/</ref>
| Bridge over Columbia River; 2 lanes opened in October
|-style="background:#9F9"
| Washington
| Seattle to Bellevue
| {{dts|1993|09}}
| Last section in state; express lanes removed in 2017
|-style="background:#9F9"
| Idaho
| Wallace
| {{dts|1991|09}}
| Last section in state
|-
| Montana
| Bearmouth to Drummond (43 miles)
| {{dts|}}
| First section in state to be contracted (1958)
|-
| Montana
| Superior bypass
| {{dts|1961|06}}<ref>https://www.newspapers.com/clip/90325309/superior-residents-frown-on-sign/</ref>
| First section in state<ref>https://www.newspapers.com/clip/90325192/ie-road-network-speeded-by-federal/</ref>
|-
| Montana
| Homestake Pass
| {{dts|1966|10}}
| Crossing the Continental Divide<ref name="MT">{{JSTOR|24416216}}, p. 60</ref>
|-style="background:#9F9"
| Montana
| Livingston to Springdale (20 miles)
| {{dts|1987|05}}<ref>https://www.newspapers.com/clip/89956022/i-90-finally-done/</ref>
| Last 4-lane section in state
|-
| Montana
|
| circa 1995
| Converted to four-lane freeway with full median
|-style="background:#9F9"
| Wyoming
| Montana line to Ranchester (10 miles)
| {{dts|1985|10|10}}
| Last section in state
|-
| South Dakota
| [[Lewis and Clark Memorial Bridge]]
| {{dts|1974|08}}<ref>https://www.newspapers.com/clip/89956442/i-90-bridge-at-chamberlain-opens-to/</ref>
| Bridge over Missouri River; dedicated on July 7
|-style="background:#9F9"
| South Dakota
| Wyoming line to Spearfish (9.8 miles)
| {{dts|1976|11}}<ref>https://www.newspapers.com/clip/89956130/i-90-ceremony-to-be-held-near-spearfish/</ref>
| Last section in state
|-
| Minnesota
| Austin (6.4 miles)
| {{dts|1961|11}}
| First section in state
|-
| Minnesota
| [[Dresbach Bridge]]
| {{dts|1967|10}}<ref>https://www.newspapers.com/clip/89956371/many-drives-give-new-i-90-a-trial-spin/</ref><ref>https://www.newspapers.com/clip/89956374/2nd-major-i-90-project-at-la-crosse-is/</ref>
| Replaced in 2016
|-style="background:#9F9"
| Minnesota
| Guckeen to Frost (14 miles)
| {{dts|1978|09}}
| Last section in state; golden spike at Blue Earth
|-
| Wisconsin
| Illinois to Janesville (18 miles)<ref>https://www.newspapers.com/clip/89956670/opens-18-miles-of-interstate-expressway/</ref>
| {{dts|1959|11}}
| First section in state; extension of IL Tollway
|-
| Wisconsin
| Janesville to Madison (30 miles)
| {{dts|1962|11}}
| "Third longest freeway sector" to be completed under 1956 act;<ref>https://www.newspapers.com/clip/89956704/expressway-from-chicago-to-dells-open/</ref> marks 45 percent completion of Wisconsin system<ref>https://www.newspapers.com/clip/89956721/198-miles-now-open-on-i-90-in/</ref>
|-style="background:#9F9"
| Wisconsin
| La Crosse to Tomah (37.6 miles)
| {{dts|1969|11}}<ref>https://www.newspapers.com/clip/89956761/ribbons-all-cut-i-90-is-now-open/</ref>
| Last section in state<ref>https://www.newspapers.com/clip/89956768/i-90-rites-open-4-laner-to-area/</ref>
|-
| Illinois
| Tri-State (Kingery) Expressway
| {{dts|1950|11}}<ref>{{cite news |last=Foust |first=Hal |date=October 23, 1950 |title=First Section of Expressway Will Open Nov. 1 |at=sec. 1, p. 14 |work=Chicago Tribune |url=https://www.newspapers.com/clip/90008367/first-section-of-expressway-will-open/ |via=Newspapers.com |accessdate=December 4, 2021}}</ref>
| Transferred to I-94 in 1965?
|-
| Illinois
| Congress (Eisenhower) Expressway, first sections
| {{dts|1955|12}}<ref>https://www.newspapers.com/clip/89957155/show-45-mile-congress-st-stretch-to/</ref>
| Transferred to I-290 in 1977
|-
| Illinois
| Chicago Skyway
| {{dts|1958|04|16}}<ref>https://www.newspapers.com/clip/89957115/a-great-day-for-chicago-skyway-open/</ref>
| Technically a toll bridge due to state law; maps from the era show I-94 on Skyway and 90 on the Kingery Expressway<ref>https://www.idaillinois.org/digital/collection/isl9/id/108/rec/35</ref>
|-
| Illinois
| Northwest Tollway from Chicago to Elgin (76 miles)
| {{dts|1958|08|20}}<ref>https://www.newspapers.com/clip/89957220/traffic-rolls-on-76-miles-of-tollways/</ref>
| I-90 originally split at Des Plaines, rest was signed IL 194<ref>https://www.idaillinois.org/digital/collection/isl9/id/211/rec/48</ref>
|-
| Illinois
| Northwest (Kennedy) Expressway from 
| {{dts|1960|11|05}}<ref>https://www.newspapers.com/clip/89957237/n-w-thruway-does-good-job-in-first/</ref>
| Not originally part of I-90 until 1977 switch; express lanes added in 1992–94
|-style="background:#9F9"
| Illinois
| Dan Ryan Expressway (71st to current I-290)
| {{dts|1962|12|15}}
| Last section of current I-90 in the state<br />"Widest freeway in the world";<ref>https://www.wbez.org/stories/how-the-dan-ryan-changed-the-south-side/c61e76c7-0ce7-438a-9697-cec04ca4e388</ref> rebuilt in 2006–2007
|-
| Indiana
| Tri-State Expressway, 177th (IL) to Columbia Ave in Hammond
| {{dts|1951|12|13}}<ref>https://www.newspapers.com/clip/90008620/schricker-stevenson-open-super-highway/</ref><ref>https://www.newspapers.com/clip/90008624/indiana-faces-last-hurdle-in-toll-road/</ref>
| First section in state; part of I-94 since 1965
|-
| Indiana
| Toll Road, South Bend to Ohio (80 miles)
| {{dts|1956|08|16}}<ref>https://www.newspapers.com/clip/90008518/indiana-opens-80-mile-link-of-toll-road/</ref><ref>https://www.newspapers.com/clip/90008522/simple-rite-will-open-toll-gates/</ref>
| First toll section in state, began construction in September 1954; dedicated in September<ref>https://www.newspapers.com/clip/90008491/thousands-see-toll-road-fete/</ref>
|-style="background:#9F9"
| Indiana
| Toll Road, IL to Gary interchange (16.7 miles)
| {{dts|1956|11|15}}<ref>https://www.newspapers.com/clip/90008489/no-fanfare-as-final-indiana-toll-link/</ref>
| Toll road opened in stages from east to west; Last section in state; to be linked with Chicago Skyway (opened in 1958)
|-
| Ohio
| Shoreway?
| 
| 
|-
| Ohio
| Turnpike, Indiana to Youngstown?
| {{dts|1955|10|01}}<ref>https://news.google.com/newspapers?nid=8_tS2Vw13FcC&dat=19551001&printsec=frontpage&hl=en</ref>
| 
|-
| Ohio
| Cleveland Innerbelt, Chester Avenue to SR 2
| {{dts|1959|12|17}}<ref>https://case.edu/ech/articles/i/innerbelt-freeway</ref>
| First section of Innerbelt, following bridge in August
|-style="background:#9F9"
| Ohio
| West Cleveland to I-490
| {{dts|1978|11|04}}<ref>https://www.newspapers.com/clip/90008915/heckler-draws-retort-from-rhodes/</ref>
| Last section in state<ref>https://www.dot.state.oh.us/Divisions/Planning/Environment/manuals_guidance/Documents/Cultural%20Resources/Context_Studies/Context%20for%20Interstate%20System%20in%20Ohio.pdf (p. 18)</ref>
|-
| Ohio
| [[George V. Voinovich Bridges]]
| {{dts|2013}} to 2016
| Replacement of old bridges in Cleveland
|-
| Pennsylvania
| Ohio to Erie (26 miles)
| {{dts|1960|07|01}}
| First section in state<ref>https://www.newspapers.com/clip/90009037/freeway-around-erie-pa-to-open/</ref>
|-style="background:#9F9"
| Pennsylvania
| Erie to New York (20 miles)
| {{dts|1960|10}}<ref>{{cite news |last=White |first=William A. |date=October 28, 1960 |title='Dead-End' Thruway Is Opened At Erie |page=4 |work=[[The Pittsburgh Press]] |url=https://www.newspapers.com/clip/89848466/dead-end-thruway-is-opened-at-erie/ |via=Newspapers.com |accessdate=December 1, 2021}}</ref>
| Last section in state
|-
| New York
| Lowell to West Henrietta near Rochester (115 miles)
| {{dts|1954|06|23}}<ref>{{cite news |last=Ingraham |first=Joseph C. |date=June 23, 1954 |title=Thruway to Open Officially Today |page=29 |url=https://www.nytimes.com/1954/06/24/archives/thruway-to-open-officially-today-dewey-will-cut-tape-on-first-toll.html |work=The New York Times |accessdate=}}</ref>
| First Thruway section; Buffalo extension opened August 25, 1954<ref>{{cite news |last=Ingraham |first=Joseph C. |date=August 27, 1954 |title=Link in Thruway Opened By Dewey |page=23 |url=https://www.nytimes.com/1954/08/27/archives/link-in-thruway-opened-by-dewey-57mile-trunk-stretch-ties-buffalo.html |work=The New York Times |accessdate=}}</ref>
|-
| New York
| Westmoreland to Newburgh (183 miles)
| {{dts|1954|10|26}}<ref>{{cite news |last=Ingraham |first=Joseph C. |date=October 24, 1954 |title=More Thruway: Newburgh-Utica Link Opens Tuesday, Bringing Pike Within 61 Miles of City |page=X19 |url=https://www.nytimes.com/1954/10/24/archives/more-thruway-newburghutica-link-opens-tuesday-bringing-pike-within.html |work=The New York Times |accessdate=}}</ref>
| Last Thruway section from Albany to Buffalo; gives NY the longest toll road in the country<br />Final two-lane section eliminated in December<ref>{{cite news |date=December 1, 1954 |title=Thruway is Nearing Full 4-Lane Status |page=28 |url=https://www.nytimes.com/1954/12/01/archives/thruway-is-nearing-full-4lane-status.html |work=The New York Times |accessdate=}}</ref>
|-
| New York
| Pennsylvania to Buffalo (70 miles)
| {{dts|1957|12|14}}<ref>{{cite news |date=December 15, 1957 |title=The Thruway Becomes the Longest Toll Road |page=159 |url=https://www.nytimes.com/1957/12/15/archives/the-thruway-becomes-the-longest-toll-road-on-schedule.html |work=The New York Times |accessdate=}}</ref>
| Last mainline Thruway section; construction began in October 1954
|-style="background:#9F9"
| New York
| Berkshire Connector, I-87 to MassPike
| {{dts|1959|05|26}}<ref>{{cite news |last=Weaver Jr. |first=Warren |date=May 27, 1959 |title=Thruway Opened to New England |page=20 |url=https://www.nytimes.com/1959/05/27/archives/thruway-opened-to-new-england-governor-rides-half-moon-in-symbolic.html |work=The New York Times |accessdate=}}</ref>
| Last Thruway section on I-90; eastern half opened on October 8, 1958<ref>{{cite news |last=Stengren |first=Bernard |date=October 9, 1958 |title=Thruway Opens a Berkshire Link |page=34 |url=https://www.nytimes.com/1958/10/09/archives/thruway-opens-a-berkshire-link-harriman-hails-dedication-of-eastern.html |work=The New York Times |accessdate=}}</ref>
|-
| New York
| 
| 
| First non-Thruway section
|-style="background:#9F9"
| New York
| Schodack Center area (3.6 miles)<ref>{{cite news |last=Faber |first=Harold |date=February 23, 1976 |title=Bypass Cuts Into Income Of Thruway |page=52 |url=https://www.nytimes.com/1976/02/23/archives/bypass-cuts-into-income-of-thruway.html |work=The New York Times |accessdate=}}</ref>
| {{dts|1976}}<ref>{{cite web |year=1977 |title=New York State Department of Transportation Annual Report, 1976 |page=7 |url=https://nysl.ptfs.com/data/Library1/Library1/pdf/1760149_1976.pdf |publisher=[[New York State Department of Transportation]] |via=[[New York State Library]] |accessdate=}}</ref>
| Final non-Thruway section; I-90 moved from earlier route along full Berkshire<ref>https://web.archive.org/web/20160213195904/http://blog.timesunion.com/gettingthere/thruway-connectors-name-spurs-question/697/</ref>
|-
| Massachusetts
| New York to Route 128, Newton
| {{dts|1957|05|15}}<ref>https://www.newspapers.com/clip/90009666/toll-road-open-hub-extension-vowed/</ref>
| First section in state
|-style="background:#9F9"
| Massachusetts
| Allston to South Stations (3.7 miles)
| {{dts|1965|02|18}}<ref>{{cite news |last=Hanron |first=Robert B. |date=February 19, 1965 |title=East-West Gateway Swings Open; 60 M.P.H. Through Boston... |page=1 |work=The Boston Globe |url=https://www.newspapers.com/clip/90009765/east-west-gateway-swings-open/ |via=Newspapers.com |accessdate=December 4, 2021}}</ref>
| Last original section in state
|-
| Massachusetts
| [[Big Dig]]
| {{dts|2003|01|18}}<ref>{{cite news |last=Lewis |first=Raphael |date=January 18, 2003 |title=Pike tunnel finished, and new era begins |page=A1 |work=The Boston Globe |url=http://www.boston.com/dailyglobe2/018/metro/Pike_tunnel_finished_and_new_era_begins+.shtml |url-status=dead |archive-url=https://web.archive.org/web/20030124144148/http://www.boston.com/dailyglobe2/018/metro/Pike_tunnel_finished_and_new_era_begins+.shtml |archive-date=January 24, 2003 |accessdate=}}</ref>
| Extension via tunnels from I-93 to Logan; July 2006 tunnel collapse and closure until September (or later?)
|}

===First and last sections===

{| class="wikitable sortable"
|-
! State !! First section !! Last section !! class=unsortable | Other notes
|-
| [[Interstate 90 (Washington)|Washington]]
| {{dts|1956|11}}, Spokane Valley (Havana to Pines)<ref>https://www.newspapers.com/clip/89848854/freeway-is-five-traffic-benefits-are/</ref>
| {{dts|1993|09}}, Seattle to Bellevue
| 
|-
| [[Interstate 90 (Idaho)|Idaho]]
| {{dts|1960|10}}, Coeur d'Alene<ref>https://www.newspapers.com/clip/89848901/freeway-opened-at-coeur-dalene/</ref>
| {{dts|1991|09}}, Wallace<br />{{dts|1992}}, Veterans Bridge
| 
|-
| [[Interstate 90 (Montana)|Montana]]
| {{dts|1961|06}}
| {{dts|1987|05}}, west of Springdale (20 miles)<ref>https://www.newspapers.com/clip/24026005/i-90-finished-in-state-montana/</ref>
| 1959: Springdale Cut was "one of the first major interstate jobs [in MT]"<ref>https://www.newspapers.com/image/410147159/?terms=%22interstate%2090%22&match=1</ref>
|-
| [[Interstate 90 (Wyoming)|Wyoming]]
| {{dts|}}
| {{dts|1985|10|10}}, at Montana border (10 miles)
| 
|-
| [[Interstate 90 (South Dakota)|South Dakota]]
| {{dts|}}
| {{dts|1976|11}}, Montana to Spearfish (9.8 miles)<ref>https://www.newspapers.com/clip/89956141/interstate-history-recorded/</ref>
| 
|-
| [[Interstate 90 (Minnesota)|Minnesota]]
| {{dts|1961|11}}, Austin (6.4 miles)<ref>https://www.newspapers.com/clip/89956300/beltline-at-austin-opened/</ref>
| {{dts|1978|09}}, Guckeen to Frost (14 miles) with golden spike at Golden Earth<ref>{{cite news |last=Coleman |first=Nick |date=September 24, 1978 |title=Blue Earth puts Golden Spike in Interstate 90 |pages=[https://www.newspapers.com/clip/89956184/blue-earth-puts-golden-spike-in/ 1A], [https://www.newspapers.com/clip/89956211/blue-earth-puts-golden-spike-in/ 16A] |work=[[Minneapolis Tribune]] |url=https://www.newspapers.com/clip/89956184/blue-earth-puts-golden-spike-in/ |via=Newspapers.com |accessdate=}}</ref>
| 
|-
| [[Interstate 90 (Wisconsin)|Wisconsin]]
| {{dts|1959|11}}, Illinois to Janesville (15 miles)<ref>https://www.newspapers.com/clip/89956662/nelson-opens-i-90-section/</ref><ref>{{cite WisDOT map |date=1960 |access-date=}}</ref>
| {{dts|1962|11}}, Janesville to Madison (30 miles)
| 
|-
| [[Interstate 90 (Illinois)|Illinois]]
| {{dts|1955}}, Eisenhower or 1958, Skyway 
| {{dts|1962|12}}, Dan Ryan
| Originally on I-290 (Congress/Eisenhower) and South Dan Ryan (switched with I-94)
|-
| [[Interstate 90 (Indiana)|Indiana]]
| {{dts|1956|08}}, South Bend to Ohio
| {{dts|1956|11}}, Gary
| 
|-
| [[Interstate 90 (Ohio)|Ohio]]
| {{dts|}}
| {{dts|1978|11}}, west of Cleveland
| 
|-
| [[Interstate 90 (Pennsylvania)|Pennsylvania]]
| {{dts|1960|07}}, Ohio to Erie
| {{dts|1960|10}}, Erie to NY
| 
|-
| [[Interstate 90 (New York)|New York]]
| {{dts|1954|06}}
| {{dts|1976}}
| 
|-
| [[Interstate 90 (Massachusetts)|Massachusetts]]
| {{dts|1957|05}}
| {{dts|1965|02}}
| 
|}

==References==
{{reflist}}

==Major junctions==

==Auxiliary routes==
{| class="wikitable sortable"
|-
! State(s) !! Route !! class=unsortable | Notes
|-
| [[South Dakota]] || {{jct|state=SD|I|190}} || Serves [[Rapid City, South Dakota|Rapid City]]
|-
| rowspan=2 | [[Illinois]]
| {{jct|state=IL|I|190}} || Serves [[O'Hare International Airport]]
|-
| {{jct|state=IL|I|290}} || Bypasses [[Chicago]]
|-
| [[Ohio]] || {{jct|state=OH|I|490}} || Serves [[Cleveland, Ohio|Cleveland]]
|-
| rowspan=9 | [[New York (state)|New York]]
| {{jct|state=NY|I|190}}
|-
| {{jct|state=NY|I|290}}
|-
| {{jct|state=NY|I|390}}
|-
| {{jct|state=NY|I|490}}
|-
| {{jct|state=NY|I|590}}
|}

* [[Buffalo, New York]]: [[Interstate 190 (New York)|I-190]], [[Interstate 290 (New York)|I-290]], [[Interstate 990|I-990]] (not directly connected)
* [[Rochester, Monroe County, New York|Rochester, New York]]: [[Interstate 390 (New York)|I-390]], [[Interstate 490 (New York)|I-490]], [[Interstate 590|I-590]] (not directly connected)
* [[Syracuse, New York]]: [[Interstate 690|I-690]]
* [[Utica, New York]]: [[Interstate 790|I-790]]
* [[Schenectady, New York]]: [[Interstate 890|I-890]]
* [[Worcester, Massachusetts]]: [[Interstate 290 (Massachusetts)|I-290]] (spur to [[Interstate 495 (Massachusetts)|I-495]]), [[Interstate 190 (Massachusetts)|I-190]] (spur to [[Leominster, Massachusetts]], northerly roadbed connected only to I-290 and not to I-90 itself)

=[[Interstate 5 in Washington]]=

==History==
===National highway and state upgrades===

*1951: State legislature approves bond sales to fund four-lane expansion of US 99
**Bypasses of various cities, while other sections are upgraded to limited access standards<ref>{{cite news |last=Cunningham |first=Ross |date=November 3, 1953 |title=By-Passes Explained By Highway Men |page=25 |work=The Seattle Times}}</ref>
**Vancouver to Centralia completed by 1953<ref>{{cite news |last=Hittle |first=Leroy |date=May 21, 1953 |title=Paving Near Castle Rock Is Completed |page=28 |work=The Seattle Times}}</ref>
**Program scheduled to be completed by 1954<ref>https://www.newspapers.com/clip/22241486/us_99_progress/</ref>
*1952: Kalama to Kelso section completed<ref>https://www.newspapers.com/clip/22323270/kalama_highway_paving/</ref>
*1953: State Toll Bridge Authority authorized to study toll superhighways, including Tacoma–Everett corridor<ref>{{cite news |last=Cunningham |first=Ross |date=February 22, 1953 |title=Plans for Network Of Toll Highways, Bridges Take Shape |page=15 |work=The Seattle Times}}</ref>
*April 1953: Alaskan Way Viaduct opens, as part of US 99 program
*July 26, 1953: 4-lane section from Toutle River (near Castle Rock) to Foster Creek (near Toledo) opens<ref>https://www.newspapers.com/clip/22212131/toutle_to_foster_highway_completed/</ref>
*October 1953: Castle Rock to Foster Creek; first 60 mph section in the state<ref>https://www.newspapers.com/clip/22320608/castle_rock_speed_limit/</ref>
*November 20, 1953: Vancouver freeway opened from Interstate Bridge to Broadway Street (now C Street exit)<ref name="SDC-1953">{{cite news |title=1st Vancouver Freeway Link Opened |date=November 20, 1953 |page=6 |url=http://news.google.com/newspapers?id=vfNXAAAAIBAJ&sjid=f_YDAAAAIBAJ&pg=6011,3156836 |work=[[Spokane Daily Chronicle]]}}</ref>
**Extended 2 miles through to city limits (approximately Main & 49th) on April 1, 1955 ($7 million; began November 1951, dedicated day before)<ref>https://www.newspapers.com/clip/21536004/vancouver_freeway/</ref><ref>{{cite news |last=Herrington |first=Gregg |date=December 29, 1999 |title=State's first freeway starts in Vancouver |page=A1 |work=The Columbian |url=https://www.highbeam.com/doc/1P2-23435281.html |via=HighBeam |subscription=yes |accessdate=}}</ref><ref>{{cite news |last=Ryll |first=Thomas |date=October 28, 2001 |title=Finally, an all-new freeway |page=A1 |work=The Columbian |url=https://www.highbeam.com/doc/1P2-23485838.html |via=HighBeam |subscription=yes |accessdate=}}</ref>
***Dedicated on March 31 with a 19-gun artillery salute; first real freeway in Washington state
*September 15, 1954: 4-lane highway opens from National Avenue in Chehalis to Fort Borst Park in Centralia<ref>https://www.newspapers.com/clip/22212039/chehaliscentralia_highway_opened/</ref>
*September 17, 1954: Kelso to Castle Rock (6.5 mi, $1 million) opened to four-lane traffic in present northbound lanes<ref>https://www.newspapers.com/clip/22320448/castle_rock_to_kelso_highway_opened/</ref>
*October 30, 1954: Marysville bypass opened (9 mi, 4 lanes, $7 million)<ref>{{cite news |last=Patty |first=Stanton |date=October 31, 1954 |title=Highway Section Opens |page=22 |work=The Seattle Times}}</ref><ref>{{cite news |date=October 24, 1954 |title=Marysville Road To Open Saturday |page=23 |work=The Seattle Times}}</ref>
**Ebey Slough Bridges upgraded and twinned
*November 24, 1954: Tumwater to Grand Mound cutoff opens (14 miles, $2.75 million), bypassing Tenino (saving 5.2 miles)<ref>https://www.newspapers.com/clip/22319783/tumwater_to_grand_mound_highway/</ref>
**Initially two lanes, expanded to four on December 17<ref>https://www.newspapers.com/clip/22319951/tumwater_to_grand_mound_expanded/</ref>
*1955: Yellow Book published by Bureau of Public Roads, outlines interstate highway from San Diego to Bellingham and a bypass of Seattle<ref name="YBN-1955">{{cite map |title=General Location of National System of Interstate Highways Including All Additional Routes at Urban Areas Designated in September 1955 (Yellow Book) |date=September 1955 |url=http://commons.wikimedia.org/wiki/File:Interstate_Highway_plan_September_1955.jpg |publisher=Bureau of Public Roads |accessdate= |oclc=4165975}}</ref><ref name="YBS-1955">{{cite map |title=Yellow Book: Seattle, Washington |year=1955 |url=https://commons.wikimedia.org/wiki/File:Seattle,_Washington_1955_Yellow_Book.jpg |publisher=Bureau of Public Roads |accessdate=}}</ref>
*December 22, 1955: 4-lane section of US 99 from Chehalis to Cowlitz River near Toledo opens (14 mi, $3.3 million); entire Vancouver–Tumwater "superhighway" dedicated<ref>{{cite news |date=December 22, 1955 |title=New 4-Lane Link in '99' Is Opened |page=29 |work=The Seattle Times |agency=United Press International}}</ref><ref>https://www.newspapers.com/clip/22211951/chehalis_highway_upgrade/</ref>
**Two-lane segment near Napavine (SR 508)/Chehalis (National Ave) had opened in November<ref>https://www.newspapers.com/clip/22211962/napavine_highway_opens/</ref>
*December 30, 1955: Northbound lanes of Centralia to Grand Mound section completed (5.2 miles)<ref>https://www.newspapers.com/clip/22211990/centralia_to_grand_mound_highway/</ref>
**May 15, 1956: Southbound lanes open, eliminating last traffic signal south of Tumwater<ref>https://www.newspapers.com/clip/22212001/centralia_to_grand_mound_highway_widened/</ref>
*June 29, 1956: [[Federal Aid Highway Act of 1956]] signed, creates Interstate Highway System<ref name="FHWA-1996"/><ref name="HL-1956">{{cite web |last=Becker |first=Paula |date=December 1, 2002 |title=Eisenhower signs National System of Interstate and Defense Highways Act on June 29, 1956. |url=http://www.historylink.org/index.cfm?DisplayPage=output.cfm&file_id=4030 |work=HistoryLink |accessdate=}}</ref>
**$168 million appropriated for Everett-Seattle-Tacoma freeway to replace tollway<ref>{{cite news |last=Cunningham |first=Ross |date=June 27, 1956 |title=Road Bill Lists $168,000,000 For Tacoma-Everett Highway |page=1 |work=The Seattle Times}}</ref>
*1956: Mount Vernon to Conway?{{cn}}
*August 1956: Burlington section opens, including Skagit River bridge<ref>http://www.historylink.org/File/10407</ref><ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll1/id/2134/rec/6</ref>
*December 1956: State Supreme Court declares use of bond issues to finance $227 million toll road plan unconstitutional<ref>https://law.justia.com/cases/washington/supreme-court/1956/33648-1.html</ref><ref>{{cite news |last=Cunningham |first=Ross |date=December 5, 1956 |title=State High Court's Decision Means No Expressway Tolls |page=15 |work=The Seattle Times}}</ref><ref>{{cite news |date=May 7, 1956 |title=Toll-Road Case Taken Up By Supreme Court |page=9 |work=The Seattle Times |agency=Associated Press}}</ref>

===Interstate Highway era===
;Planning
*1958: Remaining super-2 segments to be upgraded<ref>{{cite news |date=September 26, 1958 |title=71 Miles Of New Roadway To Be in Use |page=2 |work=The Seattle Times |agency=Associated Press}}</ref>
*1964: Highway renumbering, US 99 replaces PSH 1<ref name="sr">{{cite web |last=Prahl |first=C. G. |title=Identification of State Highways |url=https://www.wsdot.wa.gov/sites/default/files/2005/04/26/Identification-of-state-highways.pdf |publisher=Washington State Highway Commission, Department of Highways |date=December 1, 1965 |accessdate=}}</ref>

;Freeway construction
*1957: Contracts awarded for Marysville to Conway, Ferndale to Blaine<ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll1/id/2515/rec/7</ref>
*By late 1959: Vancouver to Olympia, Everett to Burlington completed<ref>https://www.newspapers.com/clip/21693498/interstate_5_overview_1959/</ref>
*1958: Northbound Interstate Bridge (drawbridge) dedicated on July 1, old bridge closes<ref name="TC-bridge">{{cite web |title=The Columbia River Crossing: Bridge Project Timeline |url=http://www.columbian.com/i5bridge/ |work=[[The Columbian]] |accessdate=}}</ref>
*December 12, 1958: First section of Olympia Freeway (1 mile, $11.6 million) opens<ref>https://www.newspapers.com/clip/21693688/olympia_freeway_opens/</ref>
**6.5 miles, from Trosper Road to Mud Bay?<ref name="OLY-2008"/>
**Includes US 410 section, first three-level interchange
*October 1, 1959: Ponders Corner (Gravelly Lake) to 72nd Street in Tacoma opens; first section of Tacoma–Seattle–Everett freeway (3.3 + 1.7 mi; $4.68 million)<ref>{{cite news |date=September 30, 1959 |title=1st Stretch of Freeway To Be Opened Tomorrow |page=20 |work=The Seattle Times}}</ref>
*1960: Southbound Interstate Bridge opens to traffic after retrofit<ref name="TC-bridge"/>
*December 5, 1960: 5-mile section of Bellingham freeway opens ($5.2 million)<ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll3/id/250/rec/2</ref><ref>https://www.newspapers.com/clip/22211777/bellingham_freeway_opening/</ref><ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll1/id/3759/rec/8</ref>
*December 21, 1960: Tacoma Freeway opens from 72nd to M Street (2.9 mi)<ref>{{cite news |date=December 21, 1960 |title=Tacoma Freeway Section Opened |page=5 |work=The Seattle Times}}</ref><ref>https://www.newspapers.com/clip/24414951/tacoma_freeway_opening/</ref>
*May 1962: Ferndale section opens?{{cn}}
**Governor Rosellini made bet with BC Premier<ref>https://www.newspapers.com/clip/23689634/governor_pays_off_bet_on_highway_race/</ref>
*August 24, 1962: 5-mile section of freeway near Hazel Dell dedicated, two weeks ater opening ($4.7 million)<ref>https://www.newspapers.com/clip/22211820/hazel_dell_freeway_dedicated/</ref><ref>WSDOT, 1962 December</ref>
*October 10, 1962: Six-lane Tacoma to Midway/Highline section completed (13.5 miles, $14.5 million), beginning on east side of Puyallup River<ref>{{cite news |date=October 10, 1962 |title=Tacoma-Midway Link In Freeway Opened |page=1 |work=The Seattle Times}}</ref>
**Impact on Fife<ref>{{cite news |last=Duncan |first=Don |date=October 17, 1962 |title=Fife Sounds Sad Note Over Freeway |page=1 |work=The Seattle Times}}</ref>
**Used by drivers who broke barrier<ref>{{cite news |last=Barr |first=Robert A. |date=September 25, 1962 |title='Sneaky' Drivers Use Yet-to-Open Freeway |page=1 |work=The Seattle Times}}</ref>
*October 29, 1963: Ferndale to Dakota Creek (11 miles, $4.7 million) dedicated by governor<ref>{{cite news |date=October 27, 1963 |title=Freeway Stretch To Be Dedicated |page=11 |work=The Seattle Times |agency=Associated Press}}</ref><ref>{{cite news |date=October 29, 1963 |title=Rosellini Backs Parks Board In Dispute at Peace Arch |page=A |work=The Seattle Times}}</ref>
*October 30, 1964: Tacoma Freeway (1.5 miles) opens, between E Street and Port of Tacoma<ref>{{cite news |date=October 30, 1964 |title=Tacoma Freeway Section Dedicated |page=26 |work=The Seattle Times |agency=Associated Press}}</ref><ref>https://news.google.com/newspapers?id=nWRYAAAAIBAJ&sjid=l_cDAAAAIBAJ&pg=7036%2C6000459</ref>
*August 1965: M to C streets in Tacoma?<ref name="WA-1969May"/>{{cn}}
*September 21, 1965: Last section of Tacoma Freeway opens near Pacific Avenue Interchange ($9 million, 1 mile, 16 bridges)<ref>https://www.newspapers.com/clip/22211903/last_section_of_tacoma_freeway/</ref>
**Total cost of 6.3-mile Tacoma Freeway: $28 million; 6 interchanges
*November 23, 1965: Dakota Creek to Blaine Freeway (2.5 miles, $2.24 million),<ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll1/id/4937/rec/10</ref> ending 400 feet south of Peace Arch (landscaped into park)<ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll3/id/258/rec/1</ref><ref>{{cite news |date=November 25, 1965 |title=New Blaine Freeway Dedicated Tuesday |work=Blaine Journal}}</ref><ref>https://books.google.com/books?id=Nj_Cj16XfuwC&pg=PA449&lpg=PA449&dq=blaine+freeway+November+23,+1965&source=bl&ots=8OwzzxfikH&sig=NV4DxEUx8PsLdZIIW48ZuKHqxe8&hl=en&sa=X&ved=2ahUKEwiT25nd2rTdAhV9GTQIHV4mBzMQ6AEwBXoECAAQAQ#v=onepage&q=freeway&f=false</ref>{{cn}}
**Connected to existing Vancouver-Blaine Freeway, which opened in 1962<ref>https://www2.gov.bc.ca/assets/gov/driving-and-transportation/reports-and-reference/reports-and-studies/frontier_to_freeway.pdf</ref>
*February 1, 1966: Chuckanut Drive to Alger (9 mi, $5.3 million)<ref>{{cite news |date=January 31, 1966 |title=Ceremonies For Freeway Opening Set |page=5 |work=The Seattle Times}}</ref><ref>{{cite news |date=January 20, 1966 |title=Freeway Segment Scheduled Feb. 1 |page=A |work=The Seattle Times |agency=Associated Press}}</ref><ref name="WSDOT-Bellingham66">https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll3/id/245/rec/1</ref>
*August 1966: Alger to Nulle Road (2.5 miles) opens<ref>https://www.newspapers.com/clip/22211845/alger_freeway_opens/</ref>
*November 3, 1966: 6-mile section of Bellingham Freeway opens, from Samish Inn to Fielding Street; last four-lane segment in state<ref name="WSDOT-Bellingham66"/><ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll1/id/5085</ref>
*1967: Lewis and Clark Trail Highway becomes Washington state byway<ref name="RCW-byway">{{cite web |url=http://apps.leg.wa.gov/rcw/default.aspx?cite=47.39&full=true#47.39.020 |title=47.39.020: Designation of portions of existing highways and ferry routes as part of system. |year=1967; revised 1969, 1970, 1971, 1973, 1990, 1991, 1992, 1993, 2003, 2009, 2010, 2011 |work=Revised Code of Washington |publisher=Washington State Legislature |accessdate=}}</ref>
*1967: US 12 extended west, concurrent with I-5 from Chehalis to Grand Mound<ref name="FHWA-US12">{{cite web |last=Weingroff |first=Richard |date=April 7, 2011 |title=U.S. 12: Michigan to Washington |publisher=Federal Highway Administration |url=http://www.fhwa.dot.gov/infrastructure/us12.cfm |accessdate=}}</ref><ref name="rand1967-map">{{cite map |publisher=Rand McNally |title=Northwest, 1967 |year=1967 |url=http://www.broermapsonline.org/members/NorthAmerica/UnitedStates/Northwest/gousha_ra_1967_028.html |accessdate=}}</ref>
*January 18, 1968: 41st Street to Marine View Drive in Everett opened (3 mi, 6 lanes, $14 million)<ref>{{cite news |last=Barr |first=Robert A. |date=January 18, 1968 |title=Everett Freeway Bypass Is Opened |page=45 |work=The Seattle Times}}</ref>
*November 13, 1968: Lacey to Nisqually/Fort Lewis freeway completed (8 mi), removing last traffic signal north of Portland (at Martin Way)<ref>https://www.newspapers.com/image/151113411/?terms=Olympia%2Bfreeway</ref><ref>https://www.newspapers.com/image/384065378/?terms=Olympia%2Binterstate</ref><ref>https://www.newspapers.com/clip/23662391/ft_lewislacey_freeway/</ref>
**Began construction in May 1968, cost $2.2 million<ref>https://www.newspapers.com/clip/22211725/olympia_freeway_expansion/</ref>
**Incorporates 1936 bridge and new parallel span
*November 1968: Lake Goodwin Interchange<ref name="WA-1969May">https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll1/id/5608/</ref>
*May 14, 1969: Final section of I-5 opened, Everett to Marysville<ref name="HL-EM1969"/><ref name="Cameron-2005"/><ref name="EH-1969">{{cite news |last=Mansfield |first=Tom |title=I-5 Opened Today |date=May 14, 1969 |page=1-A |work=[[The Herald (Everett)|The Everett Herald]]}}</ref>
**Delayed from September 1968 due to bridge complications?<ref>{{cite news |last=Barr |first=Robert A. |date=September 1, 1968 |title=Completion of Everett Link Delayed |page=1 |work=The Seattle Times}}</ref>
**Construction began in early 1966; 41st interchange to Marysville, costing $11 million and using 24 major bridges and overpasses<ref>{{cite news |last=Barr |first=Robert A. |date=January 30, 1966 |title=Freeway Speed-Up to Ease Everett Jams |page=22 |work=The Seattle Times}}</ref>
*1970s: Upgrades to rural sections to full Interstate standards with new interchanges and overpasses<ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll1/id/5903/rec/3</ref>
**Marysville to Smokey Point upgraded to six lanes after settlement of eminent domain dispute with Tulalips<ref>{{cite news |last=Barr |first=Robert A. |date=March 16, 1969 |title=Angry Indians Stall Paleface Path; State's Price on 10 Acres for Interstate 5 Rejected |page=39 |work=The Seattle Times}}</ref>
***BIA plans interchange at 88th Street in 1990<ref>{{cite news |last=Bergsman |first=Jerry |date=August 2, 1989 |title=Traffic grows, so city looks for solutions |page=H1 |work=The Seattle Times}}</ref>
**1972: Stillaguamish River bridge twinned, I-5 expanded to six lanes and new interchanges added north of river ($13 million)<ref>{{cite news |last=Barr |first=Robert A. |date=July 16, 1972 |title=Rain stalls I-5 reconstruction project |page=H7 |work=The Seattle Times}}</ref><ref>{{cite news |last=Barr |first=Robert A. |date=February 14, 1971 |title=$13 million earmarked for Interstate 5 |page=A28 |work=The Seattle Times}}</ref>
***Built using new method to protect fish<ref>{{cite news |last=Barr |first=Robert A. |date=August 12, 1970 |title=State using a new method to bridge river |page=D18 |work=The Seattle Times}}</ref>
**Kelso expanded to six lanes?<ref>https://books.google.com/books?id=JIA2AQAAMAAJ</ref>

===Seattle construction===

*250-foot-wide depressed roadway requires demolition of landmarks<ref>{{cite news |date=January 6, 1955 |title=Proposed Tollway Will Doom Many Seattle Landmarks |page=1 |work=The Seattle Times}}</ref>
*Lid proposed by Thiry in 1961<ref>{{cite news |date=April 30, 1961 |title=Questions and Answers on Rival Freeway Plans—Open or Covered? |page=12 |work=The Seattle Times}}</ref>
*August 1958: Ship Canal Bridge construction begins, with goal of serving World's Fair visitors (not met)
*Low-level Duwamish River crossing design could have jeopardized port operations and development<ref>{{cite news |date=May 28, 1958 |title=Tourist See River's Promises, Problems |page=12 |work=The Seattle Times}}</ref><ref>{{cite news |last=Wells |first=Jay |date=June 24, 1959 |title=State Making '$10,000,000 Mistake' |page=58 |work=The Seattle Times}}</ref>
**Replaced with modern, high-level curved girder design; port specified minimum clearance of 135 feet
*April 1957: First hearings for Seattle Freeway route<ref>{{cite news |date=April 21, 1957 |title=Route for Proposed Freeway Announced for Public Hearing |page=16 |work=The Seattle Times}}</ref>
*1957: Funding for Seattle Freeway received on October 1<ref name="HL-1957">{{cite web |last=Becker |first=Paula |date=April 30, 2003 |title=First part of Seattle Freeway (Interstate 5) route receives federal funding on October 1, 1957. |url=http://www.historylink.org/File/4166 |work=HistoryLink |accessdate=}}</ref>
*Department of Highways establishes special division for Seattle Freeway (Division 7), headed by E. I. Roberts

;Resources
*[https://books.google.com/books?id=4--gBQAAQBAJ&lpg=PA21&ots=hA6KjTHDEr&dq=%22Evergreen%20Memorial%20Highway%22%2099&pg=PR18#v=onepage&q&f=false Back to the Future] (U District)
*[https://books.google.com/books?id=AoY2AQAAMAAJ&pg=PA8&lpg=PA8&dq=%22Interstate+5%22+SEattle+%22January+31,+1967%22&source=bl&ots=NQ9lnkqGWA&sig=7_eLNySyJ1UrutrZSwmysfjgFV0&hl=en&sa=X&ved=2ahUKEwiM-6C2wcbfAhWFi1QKHavvC3oQ6AEwCnoECAQQAQ#v=onepage&q=%22Interstate%205%22%20SEattle%20%22January%2031%2C%201967%22&f=false Past Events] (EIS)

;Construction
*June 1961: Protests against freeway across First Hill<ref>http://www.historylink.org/File/3944</ref>
*October 1961: Bids open for Federal Way and Midway section
*1962: North of Downtown section well underway
*Early 1963: Construction on Seattle to Everett section begins<ref>http://www.historylink.org/File/8548</ref>
*1963: Fallout shelter at Ravenna dedicated<ref>http://www.historylink.org/File/3705</ref>
**Broke ground on May 15, 1962

;Opening dates
*December 18, 1962: First section of I-5 in Seattle opens on December 18, from Roanoke Street to Ravena Street via Ship Canal Bridge<ref name="HL-SCBr">{{cite web |last=Long |first=Priscilla |date=May 27, 2001 |title=Lake Washington Ship Canal Bridge (Interstate 5) opens to traffic in December 1962. |url=http://www.historylink.org/File/3312 |work=HistoryLink |accessdate=}}</ref>
**Ribbon cutting was premature, without speeches, due to a screw-up
*August 28, 1963: SR 520 opens, along with section of I-5 from Roanoke to Mercer (via temporary ramp at Harvard) and 75th to Ravenna<ref>{{cite news |date=August 27, 1963 |title=Pact for Center Operation O.K'd |page=22 |work=The Seattle Times}}</ref><ref>{{cite news |date=August 25, 1963 |title=Traffic Routes to Evergreen Point Floating Bridge |page=4 |work=The Seattle Times}}</ref>
**Thru traffic forced to exit off until later date{{when}}<ref>{{cite news |date=August 30, 1963 |title=To Mercer Exit Freeway Users Soon Can Go |page=1 |work=The Seattle Times}}</ref>
**November 1963: Mercer ramps open to traffic<ref>{{cite new |date=November 1, 1963 |title=New Freeway Access May Open Earlier |page=36 |work=The Seattle Times}}</ref>
**NE 45th interchange fully opens in January 1965<ref>Barr, Jan. 25, 1965</ref>
*October 30, 1964: Olive to Mercer (northbound, 2 lanes) opens, replacing Lakeview/Harvard ramp<ref>{{cite news |date=October 31, 1964 |title=Traffic Snarled By Closure Of Freeway Ramp |page=2 |work=The Seattle Times}}</ref><ref>{{cite news |date=October 28, 1964 |title=Olive-Mercer Link Of Freeway to Open |page=1 |work=The Seattle Times}}</ref><ref>{{cite news |last=Barr |first=Robert A. |date=October 15, 1964 |title=Freeway Link Nearly Ready |page=43 |work=The Seattle Times}}</ref>
*February 3, 1965: Bothell Way (75th) to Eastmont/Broadway (Everett) opens, completing 19.7 miles of freeway ($23 million)<ref name="Cameron-2005">{{cite book |ref=Cameron |last1=Cameron |first1=David A. |last2=Grimes |first2=Lynne |last3=Wyatt |first3=Jane |year=2005 |title=Snohomish County: An Illustrated History |publisher=Kelcema Books |isbn=0-9766700-0-3 |chapter=Chapter 11: 1965&ndash;2004 |page=332}}</ref><ref name="HL-ES1965">{{cite web |last=Dougherty |first=Phil |date=March 24, 2008 |title=Interstate 5 is completed from Everett to Seattle on February 3, 1965. |url=http://www.historylink.org/File/8548 |work=HistoryLink |accessdate=}}</ref>
**Several missing interchanges (Northgate, 236th, 220th, 128th) opened later; only access from 145th, 175th, 205th<ref>{{cite news |last=Barr |first=Robert A. |date=January 25, 1965 |title=Big Freeway Jams Expected Because of Uncompleted Exits |page=1 |work=The Seattle Times}}</ref><ref>{{cite news |last=Barr |first=Robert A. |date=January 10, 1965 |title=Freeway May Catch Up to Interchanges In 1 to 6 Years |page=1 |work=The Seattle Times}}</ref>
**Peak loads create traffic jams<ref>{{cite news |last=Barr |first=Robert A. |date=March 17, 1965 |title=Freeway Loads Tops Capacity |page=1 |work=The Seattle Times}}</ref>
*June 2, 1965: Reversible express lanes and 13 ramps (until Pine) open<ref>{{cite news |date=May 3, 1965 |title=Reversible Lanes to Aid Traffic Flow |page=13 |work=The Seattle Times}}</ref><ref>{{cite news |last=Barr |first=Robert A. |date=June 3, 1965 |title=New Reversible Route Relieves Traffic Congestion on Freeway |page=21 |work=The Seattle Times}}</ref>
**Mercer exit opens in October 1966<ref>{{cite news |last=Barr |first=Robert A. |date=October 18, 1966 |title=Mercer St. Reversible Exit to Open Tuesday |page=1 |work=The Seattle Times}}</ref>
**CCTV cameras to monitor direction change<ref>{{cite news |last=Barr |first=Robert A. |date=September 13, 1965 |title=Closed-Circuit TV Soon Will Control Freeway Lanes |page=4 |work=The Seattle Times}}</ref> and aid police<ref>{{cite news |last=Barr |first=Robert A. |date=May 7, 1965 |title=TV May Spy on Freeway Traffic |page=7 |work=The Seattle Times}}</ref>
**Delayed from May due to parts for CCTV system<ref>{{cite news |last=Barr |first=Robert A. |date=May 12, 1965 |title=Freeway 'Short-Circuited': Reversible Route Delayed |page=1 |work=The Seattle Times}}</ref>
**Relief for increasing congestion<ref>{{cite news |last=Barr |first=Robert A. |date=January 26, 1964 |title=Snarled Freeway Traffic Poses Increasing Headache |page=12 |work=The Seattle Times}}</ref>
*June 30, 1966: Olive Way to Cherry Street section opens, including ramps to University and Columbia<ref>{{cite news |last=Barr |first=Robert A. |date=July 5, 1966 |title=Route Fast but Motorists Slow |page=12 |work=The Seattle Times}}</ref><ref>{{cite news |last=Barr |first=Robert A. |date=June 12, 1966 |title=Strike, Slides May Delay Freeway Date |page=4  |work=The Seattle Times}}</ref>
*September 29, 1966: Dearborn to James northbound lanes open<ref>{{cite news |last=Barr |first=Robert A. |date=September 15, 1966 |title=New Section of Freeway, Two Exits to Be Opened |page=1 |work=The Seattle Times}}</ref><ref>{{cite news |last=Barr |first=Robert A. |date=September 25, 1966 |title=Northbound Freeway Unit to Open Thursday |page=55 |work=The Seattle Times}}</ref><ref>{{cite news |last=Barr |first=Robert A. |date=October 2, 1966 |title=Freeway to Midway Sought This Year |page=13 |work=The Seattle Times}}</ref>
*October 27, 1966: All southbound lanes open near Mercer exit; James to Dearborn southbound lanes also open<ref>{{cite news |last=Barr |first=Robert A. |date=October 27, 1966 |title=Freeway Jam Eased  by New Lanes |page=1 |work=The Seattle Times}}</ref>
*January 31, 1967: Dearborn to Midway section opens, completing Everett–Tacoma freeway; express lanes also completed<ref>{{cite news |last=Heilman |first=Robert |date=January 31, 1967 |title=Ceremony Opens Final Freeway Link |page=1 |work=The Seattle Times}}</ref><ref name="HL-ET1967">{{cite web |last=Wilma |first=David |date=September 4, 2002 |title=Interstate 5 is completed from Everett to Tacoma on January 31, 1967. |url=http://www.historylink.org/File/1354 |work=HistoryLink |accessdate=}}</ref><ref>{{cite news |last=Duncan |first=Don |date=August 13, 1985 |title=Major events: City's triumphs and tragedies make history |page=C2 |work=The Seattle Times}}</ref>
**$130 million to construct, $44 million for property acquisition<ref>{{cite news |last=Duncan |first=Don |date=December 13, 1966 |title=Freeway Link Provides Some Amazing Statistics |page=29 |work=The Seattle Times}}</ref>
***$2.3 million for Duwamish River bridge (eight 275-ft steel girders)<ref>{{cite news |last=Barr |first=Robert A. |date=March 25, 1964 |title=Tukwila Freeway Bridge: Steelwork Nears Completion |page=7 |work=The Seattle Times}}</ref>
**Dearborn to Spokane shifted to northbound lanes while southbound lanes are completed<ref>{{cite news |last=Barr |first=Robert A. |date=January 29, 1967 |title=Freeway Opening to Shift Flow |page=3 |work=The Seattle Times}}</ref>

===Later history===

;Later construction
*1970s: Rest areas built to combat driver fatigue<ref>{{cite news |last=Barr |first=Robert A. |date=May 25, 1972 |title=Rest stops: 122 along state highways; 240 is goal |page=F5 |work=The Seattle Times}}</ref>
*1973: Exit numbers installed to replace names<ref>{{cite news |date=June 3, 1973 |title=State has new map showing mileages to freeway points |page=A23 |work=The Seattle Times}}</ref>
**Mileposts erected in 1966<ref>{{cite news |date=May 21, 1966 |title=State to Erect Highway Mileposts |page=6 |work=The Seattle Times |agency=Associated Press}}</ref>

;Incidents
*Protests: Vietnam War, WTO 1999, George Floyd 2020 (1 death)
*May 23, 2013: [[I-5 Skagit River Bridge collapse|Skagit River Bridge collapses]]
*December 18, 2017: [[2017 Washington train derailment|Amtrak derailment]] closes SB lanes for hours

;Major projects
**Widening to six lanes in Chehalis (Rush Road to 13th Street)
**Widening to six lanes from US 12 to Maytown
**Concrete rehabilitation in Puget Sound region
*2005 Transportation Tax Package<ref>https://web.archive.org/web/20061231022010/http://www.wsdot.wa.gov/NR/rdonlyres/80246D82-62AC-463D-9EDF-C9FB83949587/0/ProjectsbyType.pdf</ref>
**Median barriers in Bellingham, Blaine, 
**Noise wall extensions in Seattle (near Ship Canal Bridge)
**Stormwater treatment in Bellingham, Mount Vernon
**SR 432 interchange rebuild
**Bridge repair in Seattle (northbound viaduct, southbound viaduct in South SeattlE)
*JBLM program begins construction in 2018, to be completed in 2021<ref>https://www.thenewstribune.com/news/local/traffic/article32730132.html</ref>
*2006–10: Median barriers in Marysville replaced with concrete due to fatal head-on crashes<ref>https://www.heraldnet.com/news/1-1-million-settlement-over-i-5-cable-barriers/</ref><ref>https://news.google.com/newspapers?nid=ovGv7akYl-cC&dat=20050713&printsec=frontpage&hl=en</ref>
*2011–2014: Lewis County expansion in Chehalis/Centralia
**2011 phase: Grand Mound
**2014 phase added collector lanes at SR 507 and river crossing
*2017: Pavement repair in Seattle/Tukwila
**Proposed since 2003 due to deterioration<ref>http://community.seattletimes.nwsource.com/archive/?date=20030404&slug=pavement04m</ref>
**New auxiliary lane added in 2019 by narrowing lanes and eliminating shoulder<ref>https://www.wsdot.wa.gov/Projects/I5/SenecaTo520Improve/default.htm</ref>
*Bridge retrofits: Stillaguamish, Toutle, Cowlitz

==Exit list==
<!-- FIX FOR UXINGs
{{jctinttop|exit|length_ref=<ref name="log"/>}}
{{jctbridge|exit
|river=[[Columbia River]]
|mile=0.00
|mile2=0.27
|bridge=[[Interstate Bridge]]<br />Oregon–Washington state line, continues as {{jct|state=OR|I|5}} towards [[Portland, Oregon|Portland]]}}
{{WAint|exit
|county=Clark
|cspan=13
|location=Vancouver
|lspan=6
|mile=0.28
|mile2=0.79
|exit=1A
|road={{jct|state=WA|SR|14|dir1=east|city1=Camas}}
|notes=}}
{{WAint|exit
|mile=0.39
|mile2=0.79
|exit=1B
|road=6th Street &ndash; [[Vancouver, Washington|City Center]], [[Vancouver, Washington|Convention Center]]
|notes=}}
{{WAint|exit
|mile=0.87
|mile2=1.38
|exit=1C
|road={{jct|state=WA|SR|501|dir1=north|name1=Mill Plain Boulevard|location1=[[Port of Vancouver USA|Port of Vancouver]]}}
|notes=}}
{{WAint|exit
|mile=1.54
|mile2=1.91
|exit=1D
|road=4th Plain Boulevard
|notes=}}
{{WAint|exit
|mile=1.98
|mile2=2.50
|exit=2
|road={{jct|state=WA|SR|500|dir1=east|road|39th Street|city1=Orchards}}
|notes=}}
{{WAint|exit
|mile=2.74
|mile2=3.28
|exit=3
|road=Northeast Highway 99, Main Street &ndash; [[Hazel Dell, Washington|Hazel Dell]]
|notes=}}
{{WAint|exit
|location=none
|mile=3.87
|mile2=4.74
|exit=4
|road=Northeast 78th Street
|notes=}}
{{WAint|exit
|location=none
|mile=5.02
|mile2=5.80
|exit=5
|road=Northeast 99th Street
|notes=}}
{{WAint|exit
|location=none
|mile=6.85
|mile2=8.25
|exit=7
|road={{jct|state=WA|I|205|dir1=south|road|Northeast 134th Street|location1=[[Salem, Oregon|Salem]]}}
|notes=Northbound exit to I-205 southbound is via Northeast 134th Street}}
{{WAint|exit
|location=none
|mile=9.17
|mile2=9.94
|exit=9
|road=Northeast 179th Street &ndash; [[Clark County Fair|Clark County Fairgrounds]]
|notes=}}
{{WAint|exit
|location=none
|mile=10.39
|mile2=12.18
|exit=11
|road={{jct|state=WA|SR|502|dir1=east|name1=Northeast 219th Street|location1=Battle Ground}}
|notes=}}
{{WAint|exit
|location=Ridgefield
|mile=13.37
|mile2=14.58
|exit=14
|road={{jct|state=WA|SR|501|dir1=south|name1=Pioneer Street|city1=Ridgefield}}
|notes=}}
{{WAint|exit
|location=none
|mile=16.40
|mile2=17.22
|exit=16
|road=Northwest La Center Road &ndash; [[La Center, Washington|La Center]]
|notes=}}
{{WAint|exit
|county=Cowlitz
|cspan=13
|location=Woodland
|lspan=2
|mile=20.85
|mile2=22.19
|exit=21
|road={{jct|state=WA|SR|503|dir1=east|city1=Woodland|city2=Cougar}}
|notes=}}
{{WAint|exit
|mile=22.15
|mile2=23.18
|exit=22
|road=Dike Access Road
|notes=}}
{{WAint|exit
|location=none
|mile=27.22
|mile2=28.22
|exit=27
|road=Todd Road &ndash; [[Port of Kalama]]
|notes=}}
{{WAint|exit
|location=Kalama
|mile=29.38
|mile2=31.01
|exit=30
|road=Elm Street / Oak Street &ndash; [[Kalama, Washington|Kalama]]
|notes=}}
{{WAint|exit
|location=none
|mile=32.00
|mile2=32.75
|exit=32
|road=Kalama River Road
|notes=}}
{{WAint|exit
|location=Kelso
|lspan=3
|mile=36.11
|mile2=37.48
|exit=36
|road={{jct|state=WA|SR|432|dir1=west|to2=to|SR|4|city1=Longview|city2=Long Beach}}
|notes=}}
{{WAint|exit
|mile=39.44
|mile2=40.19
|exit=39
|road={{jct|state=WA|SR|4|dir1=west|city1=Kelso}}
|notes=}}
{{WAint|exit
|mile=40.53
|mile2=41.20
|exit=40
|road=North Kelso Avenue
|notes=}}
{{WAint|exit
|location=none
|mile=42.17
|mile2=43.23
|exit=42
|road=Lexington Bridge Drive
|notes=}}
{{WAint|exit
|location=none
|mile=45.71
|mile2=46.86
|exit=46
|road=Headquarters Road, Pleasant Hill Road
|notes=}}
{{WAint|exit
|location=Castle Rock
|lspan=2
|mile=47.54
|mile2=48.64
|exit=48
|road={{jct|state=WA|BL|5|dir1=north|dab1=Castle Rock|name1=Huntington Avenue|city1=Castle Rock}}
|notes=}}
{{WAint|exit
|mile=49.42
|mile2=50.48
|exit=49
|road={{jct|state=WA|SR|411|dir1=south|SR|504|dir2=east|BL|5|dir3=south|dab1=Castle Rock|city1=Castle Rock|city2=Toutle}}
|notes=}}
{{WAint|exit
|location=none
|mile=52.32
|mile2=53.07
|exit=52
|road=Barnes Drive, Toutle Park Road
|notes=}}
{{WAint|exit
|county=Lewis
|cspan=13
|location=none
|mile=56.76
|mile2=57.95
|exit=57
|road=Jackson Highway
|notes=}}
{{WAint|exit
|location=none
|mile=59.28
|mile2=59.73
|exit=59
|road={{jct|state=WA|SR|506|dir1=west|city1=Vader|city2=Ryderwood}}
|notes=}}
{{WAint|exit
|location=none
|mile=60.73
|mile2=61.47
|exit=60
|road=Toldeo Vader Road
|notes=}}
{{WAint|exit
|location=none
|mile=62.99
|mile2=64.01
|exit=63
|road={{jct|state=WA|SR|505|city1=Winlock|city2=Toldeo}}
|notes=}}
{{WAint|exit
|location=none
|mile=68.16
|mile2=69.01
|exit=68
|road={{jct|state=WA|US|12|dir1=east|city1=Morton|city2=Yakima}}
|type=concur
|notes=South end of US&nbsp;12 overlap}}
{{WAint|exit
|location=Napavine
|lspan=2
|mile=70.74
|mile2=71.58
|exit=71
|road={{jct|state=WA|SR|508|dir1=east|city1=Napavine|city2=Onalaska}}
|notes=}}
{{WAint|exit
|mile=72.46
|mile2=73.25
|exit=72
|road=Rush Road
|notes=}}
{{WAint|exit
|location=none
|mile=74.14
|mile2=75.42
|exit=74
|road=Labree Road
|notes=}}
{{WAint|exit
|location=Chehalis
|lspan=3
|mile=76.31
|mile2=77.09
|exit=76
|road=13th Street
|notes=}}
{{WAint|exit
|mile=77.62
|mile2=78.46
|exit=77
|road={{jct|state=WA|SR|6|dir1=west|city1=Pe Ell|city2=Raymond}}
|notes=}}
{{WAint|exit
|mile=78.64
|mile2=79.57
|exit=79
|road=Chamber Way
|notes=}}
{{WAint|exit
|location=Centralia
|lspan=2
|mile=81.28
|mile2=82.15
|exit=81
|road={{jct|state=WA|SR|507|dir1=north|name1=Mellen Street}}
|notes=}}
{{WAint|exit
|mile=82.45
|mile2=83.33
|exit=82
|road=Harrison Avenue, Factory Outlet Way
|notes=}}
{{WAint|exit
|county=Thurston
|cspan=13
|location=Grand Mound
|mile=87.87
|mile2=88.97
|exit=88
|road={{jct|state=WA|US|12|dir1=west|city1=Aberdeen|city2=Tenino}}
|type=concur
|notes=North end of US&nbsp;12 overlap}}
{{WAint|exit
|location=none
|mile=94.94
|mile2=95.28
|exit=95
|road={{jct|state=WA|SR|121|dir1=north|city1=Littlerock|city2=Maytown}}
|notes=}}
{{WAint|exit
|location=none
|mile=98.75
|mile2=99.84
|exit=99
|road={{jct|state=WA|SR|121|dir1=south|name1=93rd Avenue}}
|notes=}}
{{WAint|exit
|location=Tumwater
|lspan=4
|mile=100.81
|mile2=101.94
|exit=101
|road=Tumwater Boulevard &ndash; [[Olympia Regional Airport|Olympia Airport]]
|notes=}}
{{WAint|exit
|mile=102.54
|mile2=103.24
|exit=102
|road=Tosper Road &ndash; [[Black Lake (Washington)|Black Lake]]
|notes=}}
{{WAint|exit
|mile=103.49
|exit=103
|road=Deschutes Way &ndash; [[Tumwater Historic District]]
|type=incomplete
|notes=Northbound exit}}
{{WAint|exit
|mile=103.80
|mile2=104.88
|exit=104
|road={{jct|state=WA|US|101|dir1=north|city1=Aberdeen|city2=Port Angeles}}
|notes=}}
{{WAint|exit
|location=Olympia
|lspan=2
|mile=104.96
|mile2=106.30
|exit=105
|road=Henderson Boulevard &ndash; [[Washington State Capitol|State Capitol]], [[Olympia, Washington|City Center]], [[Port of Olympia]]
|notes=Signed as southbound exits 105A and 105B}}
{{WAint|exit
|mile=106.98
|mile2=107.96
|exit=107
|road=Pacific Avenue
|notes=}}
{{WAint|exit
|location=Lacey
|lspan=3
|mile=108.00
|mile2=108.53
|exit=108
|road=Sleater-Kinney Road, College Street
|notes=Signed as northbound exits 108A and 108B}}
{{WAint|exit
|mile=108.90
|mile2=109.59
|exit=109
|road=Martin Way
|notes=}}
{{WAint|exit
|mile=110.91
|mile2=112.50
|exit=111
|road={{jct|state=WA|SR|510|dir1=east|name1=Marvin Road|city1=Yelm}}
|notes=}}
{{WAint|exit
|location=none
|mile=113.77
|mile2=114.72
|exit=114
|road=Martin Way, Nisqually Cutoff Road &ndash; [[Nisqually, Washington|Nisqually]]
|notes=}}
{{WAint|exit
|county=Pierce
|cspan=18
|location=none
|mile=116.48
|mile2=117.32
|exit=116
|road=Mounts Road
|notes=}}
{{WAint|exit
|location=DuPont
|mile=117.47
|mile2=118.46
|exit=118
|road=Center Drive &ndash; [[DuPont, Washington|City Center]]
|notes=}}
{{WAint|exit
|location=Fort Lewis
|lspan=2
|mile=118.70
|mile2=119.44
|exit=119
|road=Steilacoom-DuPont Road
|notes=}}
{{WAint|exit
|mile=120.39
|mile2=121.46
|exit=120
|road=41st Division Drive &ndash; [[Joint Base Lewis-McChord]]
|notes=}}
{{WAint|exit
|location=Lakewood
|lspan=6
|mile=122.39
|mile2=123.11
|exit=122
|road=Berkley Street
|notes=}}
{{WAint|exit
|mile=123.33
|mile2=124.00
|exit=123
|road=Thorne Lane
|notes=}}
{{WAint|exit
|mile=124.27
|mile2=125.15
|exit=124
|road=Gravelly Lake Drive
|notes=}}
{{WAint|exit
|mile=125.51
|mile2=126.26
|exit=125
|road=Bridgeport Way &ndash; [[McChord Field]]
|notes=}}
{{WAint|exit
|mile=126.83
|mile2=128.12
|exit=127
|road={{jct|state=WA|SR|512|dir1=east|road|South Tacoma Way|city1=Puyallup}}
|notes=}}
{{WAint|exit
|mile=128.54
|mile2=128.98
|exit=128
|road=South 84th Street
|type=incomplete
|notes=Northbound exit and southbound entrance}}
{{WAint|exit
|location=Tacoma
|lspan=6
|mile=129.16
|mile2=130.08
|exit=129
|road=South 72nd Street
|notes=}}
{{WAint|exit
|mile=130.29
|mile2=131.14
|exit=130
|road=South 56th Street, Tacoma Mall Boulevard &ndash; [[University Place, Washington|University Place]]
|notes=}}
{{WAint|exit
|mile=131.41
|mile2=132.95
|exit=132
|road={{jct|state=WA|SR|16|dir1=west|road|South 38th Street|city1=Bremerton}}
|notes=}}
{{WAint|exit
|mile=133.35
|mile2=134.24
|exit=133
|road={{jct|state=WA|I|705|dir1=north|SR|7|dir1=south|location1=[[Tacoma, Washington|City Center]]}}
|notes=}}
{{WAint|exit
|mile=134.35
|mile2=134.97
|exit=134
|road=Portland Avenue
|type=incomplete
|notes=Northbound exit and southbound entrance}}
{{WAint|exit
|mile=135.03
|mile2=135.38
|exit=135
|road={{jct|state=WA|SR|167|dir1=north|city1=Puyallup}}
|notes=}}
{{WAint|exit
|location=Fife
|lspan=2
|mile=135.75
|mile2=136.57
|exit=136
|road=Port of Tacoma Road, 20th Street East &ndash; [[Port of Tacoma]]
|notes=Signed as northbound exits 136A and 136B}}
{{WAint|exit
|mile=136.81
|mile2=138.10
|exit=137
|road={{jct|state=WA|SR|99|dir1=north|name1=54th Avenue East|city1=Fife}}
|notes=}}
{{jctco |state=WA |county=King}}
{{WAint|exit
|county1=Snohomish
|county2=King
|location1=Mountlake Terrace
|location2=Shoreline
|location_group=city
|mile=177.23
|mile2=178.49
|exit=177
|road={{jct|state=WA|SR|104|city1=Edmonds|city2=Lake Forest Park}}
|notes=}}
{{WAint|exit
|county=Snohomish
|cspan=27
|location=Mountlake Terrace
|lspan=3
|mile=178.01
|mile2=178.33
|exit=178
|road=236th Street Southwest &ndash; [[Mountlake Terrace, Washington|Mountlake Terrace]]
|type=incomplete
|notes=Northbound exit and southbound entrance}}
{{WAint|exit
|mile=178.26
|mile2=178.81
|exit=&nbsp;
|road=Mountlake Terrace Transit Center
|type=hov
|notes=Buses only}}
{{WAint|exit
|mile=178.89
|mile2=179.67
|exit=179
|road=220th Street Southwest &ndash; [[Mountlake Terrace, Washington|Mountlake Terrace]]
|notes=}}
{{WAint|exit
|location=Lynnwood
|lspan=3
|mile=180.16
|mile2=180.42
|exit=&nbsp;
|road=Lynnwood Transit Center
|type=hov
|notes=}}
{{WAint|exit
|mile=180.17
|mile2=180.81
|exit=181A
|road={{jct|state=WA|SR-Spur|524|dir1=north|dab1=Lynnwood|name1=44th Avenue West|to2=to|SR|524|dir2=west|city1=Lynnwood}}
|type=incomplete
|notes=Northbound exit and southbound entrance}}
{{WAint|exit
|mile=181.83
|mile2=182.65
|exit=181B
|road={{jct|state=WA|SR|524|name1=196th Street Southwest}}
|notes=}}
{{WAint|exit
|location=none
|mile=181.61
|mile2=183.25
|exit=182
|road={{jct|state=WA|I|405|dir1=south|SR|525|dir2=north|to3=to|SR|99|city1=Bellevue|city2=Renton|city3=Mukilteo}}
|notes=}}
{{WAint|exit
|location=Martha Lake
|lspan=3
|mile=183.46
|mile2=184.53
|exit=183
|road=164th Street Southwest
|notes=}}
{{WAint|exit
|mile=183.65
|mile2=184.21
|exit=&nbsp;
|road=Ash Way Park and Ride
|type=hov
|notes=Buses only, northbound exit and southbound entrance}}
{{WAint|exit
|mile=185.95
|mile2=186.93
|exit=186
|road={{jct|state=WA|SR|96|dir1=east|name1=128th Street Southwest}}
|notes=}}
{{WAint|exit
|location=Everett
|lspan=8
|mile=187.27
|mile2=188.57
|exit=&nbsp;
|road=South Everett Freeway Station &ndash; 112th Street Southeast
|type=hov
|notes=}}
{{WAint|exit
|mile=188.17
|mile2=190.03
|exit=189
|road={{jct|state=WA|SR|99|name1=Everett Mall Way|dir1=south|SR|526|dir2=west|SR|527|dir3=south|road|Broadway|city1=Mukilteo|location2=[[Whidbey Island Ferry]]}}
|notes=}}
{{WAint|exit
|mile=191.62
|mile2=192.41
|exit=192
|espan=2
|road=Broadway
|type=incomplete
|notes=Northbound exit and southbound entrance}}
{{WAint
|mile=191.83
|mile2=193.00
|road=41st Street, Evergreen Way
|notes=}}
{{WAint|exit
|mile=193.31
|mile2=193.71
|exit=193
|road={{jct|state=WA|SR|529|dir1=north|name1=Pacific Avenue|location1=[[Everett, Washington|City Center]]}}
|type=incomplete
|notes=Northbound exit and southbound entrance}}
{{WAint|exit
|mile=193.66
|mile2=194.50
|exit=194
|espan=2
|road={{jct|state=WA|US|2|dir1=east|city1=Snohomish|city2=Wenatchee}}
|notes=}}
{{WAint
|mile=194.08
|mile2=194.50
|road={{jct|state=WA|SR-Spur|529|name1=Everett Avenue|to2=to|SR|529|dir2=north|location1=[[Everett, Washington|City Center]]}}
|type=incomplete
|notes=Northbound entrance and southbound exit}}
{{WAint|exit
|mile=194.55
|mile2=194.87
|exit=195
|road=Marine View Drive
|type=incomplete
|notes=Northbound exit and southbound entrance}}
{{WAint|exit
|location=none
|mile=198.33
|mile2=198.67
|exit=198
|road={{jct|state=WA|SR|529|dir1=south|name1=North Broadway|location1=[[Port of Everett]]}}
|type=incomplete
|notes=Northbound entrance and southbound exit}}
{{WAint|exit
|location=Marysville
|lspan=3
|mile=198.96
|mile2=199.64
|exit=199
|road={{jct|state=WA|SR|528|dir1=east|city1=Marysville|location2=[[Tulalip Indian Reservation|Tulalip]]}}
|notes=}}
{{WAint|exit
|mile=200.24
|mile2=201.25
|exit=200
|road=88th Street Northeast, Quil Ceda Way
|notes=}}
{{WAint|exit
|mile=202.12
|mile2=202.92
|exit=202
|road=116th Street Northeast
|notes=}}
{{WAint|exit
|location1=Marysville
|location2=Arlington
|location_group=city
|mile=205.43
|mile2=206.65
|exit=206
|road={{jct|state=WA|SR|531|name1=172nd Street Northeast|city1=Smokey Point}}
|notes=}}
{{WAint|exit
|location=none
|mile=208.31
|mile2=209.14
|exit=208
|road={{jct|state=WA|SR|530|dir1=east|city1=Arlington|city2=Darrington}}
|notes=}}
{{WAint|exit
|location=none
|mile=209.95
|mile2=210.84
|exit=210
|road=236th Street Northeast
|notes=}}
{{WAint|exit
|location=none
|mile=212.31
|mile2=213.13
|exit=212
|road={{jct|state=WA|SR|532|dir1=west|city1=Stanwood|location2=[[Camano Island]]}}
|notes=}}
{{WAint|exit
|location=none
|mile=214.66
|mile2=215.56
|exit=215
|road=300th Street Northeast
|notes=}}
{{WAint|exit
|county=Skagit
|cspan=12
|location=none
|mile=218.19
|mile2=219.10
|exit=218
|road=Starbird Road
|notes=}}
{{WAint|exit
|location=Conway
|mile=220.72
|mile2=221.55
|exit=221
|road={{jct|state=WA|SR|534|dir1=east|city1=Lake McMurray}}
|notes=}}
{{WAint|exit
|location=none
|mile=223.64
|mile2=224.00
|exit=224
|road=Old Highway 99 South
|type=incomplete
|notes=Northbound exit and southbound entrance}}
{{WAint|exit
|location=Mount Vernon
|lspan=3
|mile=224.74
|mile2=225.65
|exit=225
|road=Anderson Road
|notes=}}
{{WAint|exit
|mile=225.99
|mile2=226.76
|exit=226
|road={{jct|state=WA|SR|536|dir1=west|name1=Kincaid Street}}
|notes=}}
{{WAint|exit
|mile=227.27
|mile2=228.23
|exit=227
|road={{jct|state=WA|SR|538|dir1=east|name1=College Way}}
|notes=}}
{{WAint|exit
|location=Burlington
|lspan=2
|mile=228.53
|mile2=229.41
|exit=229
|road=George Hopper Road
|notes=}}
{{WAint|exit
|mile=229.47
|mile2=230.64
|exit=230
|road={{jct|state=WA|SR|20|city1=Burlington|city2=Anacortes}}
|notes=}}
{{WAint|exit
|location=none
|mile=230.85
|mile2=231.66
|exit=231
|road={{jct|state=WA|SR|11|dir1=north|name1=Chuckanut Drive|city1=Bow|city2=Edison}}
|notes=}}
{{WAint|exit
|location=none
|mile=232.57
|mile2=233.32
|exit=232
|road=Cook Road &ndash; [[Sedro-Woolley, Washington|Sedro-Woolley]]
|notes=}}
{{WAint|exit
|location=none
|mile=236.12
|mile2=236.91
|exit=236
|road=Bow Hill Road 
|notes=}}
{{WAint|exit
|location=none
|mile=240.64
|mile2=241.42
|exit=240
|road=Lake Samish Road &ndash; [[Alger, Washington|Alger]]
|notes=}}
{{WAint|exit
|county=Whatcom
|cspan=19
|location=none
|mile=242.60
|mile2=243.14
|exit=242
|road=Nulle Road &ndash; [[South Lake Samish, Washington|South Lake Samish]]
|notes=}}
{{WAint|exit
|location=none
|mile=246.28
|mile2=246.71
|exit=246
|road=Samish Way &ndash; [[North Lake Samish, Washington|North Lake Samish]]
|notes=}}
{{WAint|exit
|location=Bellingham
|lspan=7
|mile=250.41
|mile2=251.07
|exit=250
|road={{jct|state=WA|SR|11|dir1=south|name1=Chuckanut Drive, Old Fairhaven Parkway}}
|notes=}}
{{WAint|exit
|mile=251.61
|mile2=252.56
|exit=252
|road=Samish Way &ndash; [[Western Washington University]]
|notes=}}
{{WAint|exit
|mile=252.66
|mile2=253.40
|exit=253
|road=Lakeway Drive
|notes=}}
{{WAint|exit
|mile=253.65
|mile2=254.16
|exit=254
|road=Iowa Street, Ohio Street, State Street
|notes=}}
{{WAint|exit
|mile=254.67
|mile2=255.31
|exit=255
|road={{jct|state=WA|SR|542|dir1=east|name1=Sunset Drive|location1=[[Mount Baker]]}}
|notes=}}
{{WAint|exit
|mile=255.60
|mile2=256.73
|exit=256
|road={{jct|state=WA|SR|539|dir1=north|name1=Meridian Street|road|Bellis Fair Mall Parkway|city1=Lynden}}
|notes=Signed as northbound exits 256A and 256B}}
{{WAint|exit
|mile=256.80
|mile2=257.19
|exit=257
|road=Northwest Avenue
|notes=}}
{{WAint|exit
|location=none
|mile=257.39
|mile2=258.36
|exit=258
|road=Bakerview Road &ndash; [[Bellingham International Airport]]
|notes=}}
{{WAint|exit
|location=none
|mile=259.77
|mile2=260.62
|exit=260
|road=Slater Road &ndash; [[Lummi Island]]
|notes=}}
{{WAint|exit
|location=Ferndale
|lspan=2
|mile=262.15
|mile2=263.08
|exit=262
|road=Main Street &ndash; [[Ferndale, Washington|City Center]]
|notes=}}
{{WAint|exit
|mile=263.28
|mile2=264.20
|exit=263
|road=Portal Way
|notes=}}
{{WAint|exit
|location=none
|mile=265.45
|mile2=266.38
|exit=266
|road={{jct|state=WA|SR|548|dir1=north|name1=Grandview Road|city1=Custer}}
|notes=}}
{{WAint|exit
|location=none
|mile=269.69
|mile2=270.91
|exit=270
|road=Birch Bay-Lynden Road &ndash; [[Lynden, Washington|Lynden]], [[Birch Bay, Washington|Birch Bay]]
|notes=}}
{{WAint|exit
|location=Blaine
|lspan=4
|mile=273.99
|mile2=274.23
|exit=274
|road=Peace Portal Drive &ndash; [[Semiahmoo, Washington|Semiahmoo]]
|type=incomplete
|notes=Northbound exit and southbound entrance}}
{{WAint|exit
|mile=274.62
|mile2=275.21
|exit=275
|road={{jct|state=WA|SR|543|dir1=north|location1=[[Canada–United States border|Border Crossing]]}}
|type=incomplete
|notes=Northbound exit and southbound entrance}}
{{WAint|exit
|mile=275.88
|mile2=276.42
|exit=276
|road={{jct|state=WA|SR|548|dir1=south|location1=[[Blaine, Washington|City Center]]}}
|notes=}}
{{jctplace|exit
|mile=276.62
|place=[[Peace Arch]]<br />[[Canada–United States border]], continues as {{jct|province=BC|Hwy|99}} towards [[Vancouver]]}}
{{legendRJL|exit}}-->

==Auxiliary routes==
There are three [[List of auxiliary Interstate Highways|auxiliary Interstate Highways]] for I-5 in Washington. [[Interstate 205 (Oregon–Washington)|I-205]] is an easterly bypass of Portland, Oregon and Vancouver that provides a second crossing of the Columbia River.<ref name="wsdot-map">{{cite map |title=Washington State Highways, 2011&ndash;2012 |scale=1:842,000 |year=2011 |url=http://www.wsdot.wa.gov/NR/rdonlyres/14A6187A-B266-4340-A351-D668F89AC231/0/TouristMapFront_withHillshade.pdf |format=PDF |publisher=Washington State Department of Transportation |accessdate=}}</ref> [[Interstate 405 (Washington)|I-405]] is as a bypass of the Seattle metropolitan area and serves cities in the "[[Eastside (King County, Washington)|Eastside]]" area of King County. The third and shortest auxiliary Interstate is [[Interstate 705|I-705]], which is a short spur that travels into Tacoma.<ref name="wsdot-map"/>

In addition to the auxiliary Interstates, there is one current [[Business routes of Interstate 5|business route]] related to the freeway in the state, serving as a signed connection to [[Interstate 5 Business (Castle Rock, Washington)|Castle Rock]].{{fake citation needed}}

==References==
{{reflist|2}}

=[[Interstate 90 in Washington]]=

==History==

*1940s: US 10 relocated between Thorp and Spokane (via Ellensburg, Vantage and Moses Lake, concurrent with US 395 from Ritzville)<ref>{{cite map |year=1944 |title=Highways of the State of Washington |publisher=Washington State Department of Highways |cartography=Rand McNally |url=http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~290279~90061931 |via=David Rumsey Historical Map Collection |accessdate=}}</ref>
**Old alignment becomes US 10 Alt, superseded by US 2 in 1946<ref>https://www.fhwa.dot.gov/infrastructure/us2.cfm</ref>
**Vantage Bridge built in 1927, rebuilt in 1962

;Numbering history
*I-5 to SR 900 in Seattle
**1969 as PSH 2 (ex.s. c 281)??; became I-90 in 1970
*SR 900 in Seattle to SR 900 near Issaquah
**1939 as PSH 2 (c 5); became I-90 in 1970
*SR 900 near Issaquah to North Bend
**1909 as SR 7 (c 92); became Sunset Highway in 1913 (c 65); became SR 2 in 1923 (c 185); became PSH 2 in 1937 (c 190); became I-90 in 1970
*North Bend to Easton
**1899 as wagon road (c 57); became SR 7 in 1905 (c 7); became Sunset Highway in 1913 (c 65); became SR 2 in 1923 (c 185); became PSH 2 in 1937 (c 190); became I-90 in 1970
*Easton to SR 970 near Cle Elum
**1909 as SR 7 (c 92); became Sunset Highway in 1913 (c 65); became SR 2 in 1923 (c 185); became PSH 2 in 1937 (c 190); became I-90 in 1970
*SR 970 near Cle Elum to I-82 near Ellensburg
**1913 as Inland Empire Highway (c 65); became Sunset Highway in 1915 (c 29); became Sunset Highway Southern Division in 1919 (c 110); became SR 3 in 1923 (c 185); became PSH 3 in 1937 (c 190); became I-90 in 1970
*I-82 near Ellensburg to SR 281 near George
**1915 as Sunset Highway (c 29); became North Central Highway in 1919 (c 110); became SR 7 in 1923 (c 185); became PSH 7 in 1937 (c 190); became I-90 in 1970
*SR 281 near George to US 395 at Ritzville
**1937 as PSH 18 (c 190); became I-90 in 1970
*US 395 at Ritzville to US 2 near Spokane
**1913 as Central Washington Highway (c 65); became SR 11 in 1923 (c 185); became PSH 11 in 1937 (c 190); became I-90 in 1970
*US 2 near Spokane to Idaho
**1909 as SR 7 (c 92); became Sunset Highway in 1913 (c 65); became SR 2 in 1923 (c 185); became PSH 2 in 1937 (c 190); became I-90 in 1970

===Interstate Highway construction===

;Completed freeway segments<ref name="DigitalLibrary">https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll3/search/searchterm/i-90/field/statea/mode/exact/conn/and/order/title/ad/asc</ref>
*September 13, 1958: Spokane Valley extended west from Custer/Havana to Helena Street (near SR 290); 2.04 miles and $1,649,450.70<ref>{{cite news |date=September 12, 1958 |title=Freeway in City  Opens Tomorrow |page=3 |work=Spokane Daily Chronicle |url=https://www.newspapers.com/clip/39951510/freeway_in_city_opens_tomorrow/ |via=Newspapers.com |accessdate=December 1, 2019}}</ref><ref>{{cite news |date=September 13, 1958 |title=Freeway Enters Spokane  Today |page=1 |work=The Spokesman-Review |url=https://www.newspapers.com/clip/39951389/freeway_enters_spokane_today/ |via=Newspapers.com |accessdate=December 1, 2019}}</ref>
*October 23, 1964: Spokane Valley/Greenacres (Appleway Ave/Liberty Lake) to Seaton (Starr Road); 3.2 miles<ref>{{cite news |date=October 24, 1964 |title=Freeway Section Is Open |page=6 |work=The Spokesman-Review |url=https://news.google.com/newspapers?id=_-BXAAAAIBAJ&sjid=GekDAAAAIBAJ&pg=5611%2C2625305 |via=Google News Archive |accessdate=}}</ref>
*November 15, 1964: 3.5 miles near George?{{cn}}<ref>https://www.newspapers.com/clip/37842484/tacoma_road_span_to_open/</ref><ref>https://www.newspapers.com/clip/84797891/2-highway-links-slated-for-opening/</ref>
*December 7, 1965: Four Lakes to Maple Street (Downtown Spokane), 9.2 miles, including US 2 and US 195 interchanges, for $10 million; 300–400 people attend dedication<ref>{{cite news |last=Lemon |first=John J. |date=December 7, 1965 |title=Road Dedicated |page=1 |work=Spokane Daily Chronicle |url=https://news.google.com/newspapers?id=Ym5YAAAAIBAJ&sjid=AvgDAAAAIBAJ&pg=4901%2C1539641 |via=Google News Archive |accessdate=}}</ref><ref>{{cite news |date=December 8, 1965 |title=Freeway Project Work Is Praised |page=11 |work=The Spokesman-Review |url=https://news.google.com/newspapers?id=xrRWAAAAIBAJ&sjid=0ugDAAAAIBAJ&pg=7387%2C2269701 |via=Google News Archive |accessdate=}}</ref>
**Construction began in 1961, Sunset Hill completed but put on hold due to lawsuits{{cn}}
***Routing choices included Riverfront<ref>{{cite news |date=February 4, 1964 |title=Freeway Halted; State Will Appeal |page=1 |work=Spokesman-Review |url=https://news.google.com/newspapers?id=NuBXAAAAIBAJ&sjid=FOkDAAAAIBAJ&pg=6373%2C1142134 |via=Google News Archive |accessdate=}}</ref>
**East Central section: 1,000 homes leveled, Liberty Park reduced from 28 to 26 acres, other impacts<ref>http://spokanehistorical.org/items/show/468?tour=17&index=0</ref><ref>http://www.spokesman.com/stories/2010/apr/25/freeway-redraws-housing-footprint/</ref>
*November 18, 1966: Tyler to Four Lakes (Cheney bypass) dedicated, 16.7 miles and $5.8 million<ref>{{cite news |date=November 19, 1966 |title=Gov. Evans, Crowd Dedicate New Section of Freeway 90 |page=5 |work=The Spokesman-Review |url=https://news.google.com/newspapers?id=V8xYAAAAIBAJ&sjid=AekDAAAAIBAJ&pg=5209%2C969018 |via=Google News Archive |accessdate=}}</ref>
**Football-themed dedication (because of Apple Cup)
**Governor arrived by small plane landing on highway; car fails to tear banner; Prahl's car gets flat tire
*August 8, 1967: 24 miles from Cle Elum to Ellensburg (final two-lane segment from Seattle);<ref>{{cite news |last=Loken |first=Marty |date=August 27, 1967 |title=Cle Elum, By-Passed by New Highway, Isn't Complaining |page=4 |work=The Seattle Times}}</ref><ref>{{cite news |last=McGiffin |first=Jim |date=August 9, 1967 |title=New Freeway Will Open Path For People, Industry–Evans |page=1 |work=Ellensburg Daily Record |url=https://news.google.com/newspapers?id=s5taAAAAIBAJ&sjid=t0sDAAAAIBAJ&pg=638%2C1769930 |via=Google News Archive |accessdate=}}</ref><ref>{{cite news |last=Olds |first=Virginia |date=August 11, 1967 |title=At Last! A Little Peace And Quiet |page=1 |work=Ellensburg Daily Record |url=https://news.google.com/newspapers?id=tZtaAAAAIBAJ&sjid=t0sDAAAAIBAJ&pg=4088%2C1881223 |via=Google News Archive |accessdate=}}</ref> began construction in 1965 and cost $16.5 million<ref>{{cite news |date=January 11, 1965 |title=Highways; Massive Plans Unveiled |page=1 |work=[[The Chronicle (Centralia, Washington)|The Daily Chronicle]] |location=Centralia, Washington |agency=Associated Press |url=https://www.newspapers.com/clip/21004117/1965_highway_projects/ |via=Newspapers.com |accessdate=June 17, 2018}}</ref>
**14 contractors, 31 bridges, 2 rest areas, high fence for elk, gravel pits turned into fishing ponds<ref>{{cite news |date=August 6, 1967 |title=New Interstate Section To Open  Tuesday |page=1 |work=Tri-City Herald}}</ref>
**Named one of America's most beautiful highways by Parade Magazine in 1967<ref>https://web.archive.org/web/20021122191055fw_/http://www.wsdot.wa.gov/HQ/Library/ImageLibrary/1966-68/1966-68%20image3.htm</ref>
*November 20, 1968: Ellensburg to Vantage (26.9 miles, $16.7 million) dedicated at future I-82 interchange<ref>{{cite news |date=November 21, 1968 |title=Interstate Opens Near Ellensburg |work=The Spokesman-Review |url=https://news.google.com/newspapers?id=6rVWAAAAIBAJ&sjid=fekDAAAAIBAJ&pg=3028%2C1871647 |via=Google News Archives |accessdate=}}</ref><ref>{{cite news |date=November 21, 1968 |title=Construction Of I-82 Underway By End Of Next Year |page=1 |work=Ellensburg Daily Record |url=https://news.google.com/newspapers?id=Le1OAAAAIBAJ&sjid=E0wDAAAAIBAJ&pg=2498%2C2775659 |via=Google News Archives |accessdate=}}</ref><ref>{{cite news |date=November 19, 1968 |title=George Zahn To Speak At I-90 Dedication |page=1 |work=Ellensburg Daily Record |url=https://news.google.com/newspapers?id=K-1OAAAAIBAJ&sjid=E0wDAAAAIBAJ&pg=4528%2C2616313 |via=Google News Archives |accessdate=}}</ref><ref>[https://www.newspapers.com/clip/37842509/interstate_opens_near_ellensburg/ Interstate Opens Near Ellensburg]</ref>
*November 22, 1968: Tokio to Fishtrap, including Sprague bypass (23.4 miles, $7.67 million), in time for [[Apple Cup]] (WSU-UW) at Albi Stadium in Spokane<ref>{{cite news |date=November 23, 1968 |title=Fishtrap Freeway 90 Link Open |page=5 |work=The Spokesman-Review |url=https://news.google.com/newspapers?id=7LVWAAAAIBAJ&sjid=fekDAAAAIBAJ&pg=7415%2C2606514 |via=Google News Archives |accessdate=}}</ref><ref>{{cite news |date=November 22, 1968 |title=Tokio-to-Fishtrap Highway Opened |page=5 |work=Spokane Daily Chronicle |url=https://news.google.com/newspapers?id=fY9YAAAAIBAJ&sjid=F_gDAAAAIBAJ&pg=5943%2C1685663 |via=Google News Archives |accessdate=}}</ref>
**102 miles of I-90 in the last two years
**13 bridges, 2 interchanges, 2 rest areas
**Moses Lake to Ritzville still remains (30 mi)
*1969: Moses Lake to county line near Schrag{{cn}}
*1969: Vantage area work?<ref>https://www.newspapers.com/clip/21699023/interstate_archaeology/</ref>
*September 25, 1969: Downtown Spokane Viaduct (Maple to Pine/Division); $15.3 million, 2.5 years of construction, seven contractors, 1.3 miles (6,600 feet)<ref name="DigitalLibrary"/><ref>{{cite news |date=September 18, 1969 |title=Freeway Dedication Slated in Spokane |page=1 |work=[[Tri-County Tribune]] |location=Deer Park, Washington |url=https://news.google.com/newspapers?id=oOMkAAAAIBAJ&sjid=bxEGAAAAIBAJ&pg=1869,179729 |via=Google News Archive |accessdate=}}</ref><ref>{{cite news |date=September 25, 1969 |title=Newest Freeway Section Opens; 6,600-Foot Unit Dedicated Today |page=1 |work=Spokane Daily Chronicle |url=https://news.google.com/newspapers?id=uXYzAAAAIBAJ&sjid=IvgDAAAAIBAJ&pg=6916%2C2983220 |via=Google News Archive |accessdate=}}</ref>
**Lawsuit filed by Deaconess Hospital in 1963 ruled in their favor, but overturned by state supreme court on June 7, 1965{{cn}}
*October 1971: Spokane/Pine Street to Helena Street{{cn}}
**Plans approved in November 1968<ref>[https://www.newspapers.com/clip/37842534/final_plans_completed_for_freeway/ Final Plans Completed for Freeway]</ref>
**Began construction in May 1969<ref name="DigitalLibrary"/>{{rp|Sept 25 1969}}
*September 1972: Issaquah bypass opens (a week before Sept. 13)<ref>{{cite news |last=Andrews |first=Paul |date=September 13, 1972 |title=Girls help dedicate strip of 'new' road |page=A20 |work=The Seattle Times}}</ref><ref>{{cite news |last=Andrews |first=Paul |date=October 22, 1972 |title=Businesses on old highway hit by Issaquah bypass freeway |page=G6 |work=The Seattle Times}}</ref>
*1970s: Richards Road to Issaquah{{cn}}
*August 28, 1973: Ritzville to Schrag (county line): 26.2 miles, $16 million; began in August 1971<ref>{{cite news |date=August 28, 1973 |title=Cross-State Freeway Link Opens |page=1 |work=Spokane Daily Chronicle |url=https://news.google.com/newspapers?id=7t5YAAAAIBAJ&sjid=cfgDAAAAIBAJ&pg=5288%2C3593552 |via=Google News Archive |accessdate=}}</ref><ref>{{cite news |date=August 28, 1973 |title=Last section of two-lane road replaced |page=D6 |work=The Seattle Times}}</ref><ref>https://news.google.com/newspapers?id=DhxOAAAAIBAJ&sjid=nOwDAAAAIBAJ&pg=5750%2C5216626</ref><ref>{{cite news |date=October 24, 1971 |title=I-90 Section Being Improved |page=8 |work=Tri-City Herald}}</ref>
**"Last four-lane link" in I-90's 294-mile stretch from Seattle to Spokane
**Hyak to Easton opens days later
*July 28, 1977: Spokane River bridges (at state line) dedicated, along with freeway to first interchange (with Appleway)<ref>{{cite news |date=July 26, 1977 |title=I-90 Span Dedication Due Friday |page=5 |work=Spokane Daily Chronicle |url=https://news.google.com/newspapers?id=ylZOAAAAIBAJ&sjid=-vgDAAAAIBAJ&pg=5591%2C2186906 |via=Google News Archive |accessdate=}}</ref><ref>{{cite news |last=Floyd |first=Doug |date=July 29, 1977 |title=States Linked Today by Freeway |page=5 |work=Spokane Daily Chronicle |url=https://news.google.com/newspapers?id=zVZOAAAAIBAJ&sjid=-vgDAAAAIBAJ&pg=5496%2C3145890 |via=Google News Archive |accessdate=}}</ref>
**Began construction in 1973, cost $12.5 million (built by Idaho as part of 5.5-mile Post Falls bypass)

*October 1977: Westbound segment between Snoqualmie Pass and North Bend opened, avoiding steep hillside and icing problems<ref>{{cite news |date=October 5, 1977 |title=New westbound lanes of I-90 open |page=B7 |work=The Seattle Times}}</ref>
*October 13, 1978: westbound lanes of North Bend bypass (MP 27 to 34),<ref>{{cite news |date=October 13, 1978 |title=Bypass complete now at North Bend |page=B8 |work=The Seattle Times}}</ref> featuring festival celebrating retirement of last traffic signal between Seattle and Wallace, Idaho (installed in 1965)<ref>{{cite news |last=Corsaletti |first=Lou |date=October 11, 1978 |title=Requiem set for traffic signal, 13 |page=H3 |work=The Seattle Times}}</ref>
**Eastbound lanes opened earlier<ref>{{cite news |date=October 10, 1978 |title=I-90 bypass of North Bend to be in full operation Friday |page=D11 |work=The Seattle Times}}</ref> on January 26; total project cost $27.5 million, spans 8 miles<ref>{{cite news |date=January 27, 1978 |title=North Bend bypass opens with fanfare |page=A10 |work=The Seattle Times}}</ref>
***Map ref<ref>{{cite news |date=January 25, 1978 |title=Bypass to open |page=E9 |work=The Seattle Times}}</ref>
**Construction planned in 1969 (to be complete by late 1971),<ref>{{cite news |last1=Barr |first1=Robert A. |last2=Schwartz |first2=Susan |date=February 6, 1969 |title=Start Set on North Bend Bypass |page=41 |work=The Seattle Times}}</ref> delayed by lawsuits and design changes<ref>{{cite news |date=January 23, 1978 |title=Travelers will be free at last of the North Bend light |page=B8 |work=The Seattle Times}}</ref><ref>{{cite news |last=Corsaletti |first=Lou |date=June 1, 1977 |title=North Bend plan: Does it reflect what people want? |page=H10 |work=The Seattle Times}}</ref>
***Actually began in 1976<ref>{{cite news |date=November 18, 1976 |title=North Bend bypass contract awarded |page=D6 |work=The Seattle Times}}</ref>
*1981: Denny Creek segment near Snoqualmie Pass opens<ref>{{cite news |date=July 31, 1981 |title=Easy does it |page=7 |work=[[Spokane Daily Chronicle]] |url=https://news.google.com/newspapers?id=QjwaAAAAIBAJ&sjid=UycEAAAAIBAJ&pg=4714%2c4269610 |via=Google News Archive |accessdate=}}</ref>

;Missing segments
*Issaquah
*Vantage to George (after 1961,<ref>https://www.newspapers.com/image/31067939/?terms=Ritzville+freeway</ref> before 1967)<ref>http://broermapsonline.org/online/NorthAmerica/UnitedStates/Northwest/gousha_ra_1967_028.html</ref>
*George to Moses Lake (finished by 1967)<ref>https://www.interstate-guide.com/maps/washington_south_1967.jpg</ref>
**Upgraded in 1973 for [[Expo '74]] in Spokane
*Moses Lake to Schrag?

===Seattle section===

;Resources
*[https://books.google.com/books?id=FYc2AQAAMAAJ I-90 EIS with history] (p. 16, 24)
**[https://books.google.com/books?id=AoY2AQAAMAAJ&pg=PA8&dq=Interstate+90+Moses+Lake&hl=en&sa=X&ved=0ahUKEwjr4aH3q-3bAhUQJDQIHdsqCHkQ6AEILzAB#v=onepage&q=Interstate%2090%20Moses%20Lake&f=false Alternate EIS]
*Timelines: 1940 to 1989;<ref>{{cite news |last=Pryne |first=Eric |date=May 28, 1989 |title=The New Interstate 90—The Thirty Years' War |page=A1 |work=The Seattle Times |url=http://infoweb.newsbank.com/resources/doc/nb/news/0EB53367E378B6E1?p=AMNEWS |url-access=subscription |via=NewsBank |accessdate=}}</ref> 1993<ref name="Times-1993Timeline">{{cite news |last=Reynolds |first=Peggy |date=September 9, 1993 |title=Last link of I-90 ends 30-year saga |page=A10 |url=http://community.seattletimes.nwsource.com/archive/?date=19930909&slug=1720198 |work=The Seattle Times |accessdate=}}</ref>
**[https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll22/id/94 WSDOT timeline] (1988 to 1993)
*[http://www.mercergov.org/Page.asp?NavID=2954 Mercer Island documents]

;Overview
*Total cost (1993): $1.56 billion (original 1966 estimate: $80 million)<ref name="Times-1993Timeline"/>
**90 percent federal, like most Interstates
*Phase One (1989): Westbound bridge, Mercer Island roadway, three-level westbound tunnel, three-lane section of I-5 connector (temporary connection to Dearborn from express lanes)
*Phase Two (1992–93): Eastbound bridge retrofit, squaring of tunnels, completion of other sections, west end of I-5/SODO interchange
*Temporary I-90 along Rainier and future lanes on Beacon Hill to Dearborn
*Interchanges at MLK Way and 35th Avenue (west approach) removed, controversially<ref>{{cite news |last1=Gough |first1=William |last2=Burt |first2=Lyle |date=July 24, 1986 |title=Neighbors want better I-90 access |page=B1 |work=The Seattle Times}}</ref><ref>{{cite news |last=Christensen |first=Anne |date=January 13, 1988 |title=I-90 ramps turn into a two-way protest |page=F2 |work=The Seattle Times}}</ref>
*Hundreds of meetings and public hearings{{rp|42–54}}
*Originally planned to be complete in 1971 and connect to Alaskan Way Viaduct (stub ramps)<ref>{{cite news |last=Barr |first=Robert A. |date=January 10, 1965 |title=Freeway May Catch Up to Interchanges In 1 to 6 Years |page=1 |work=The Seattle Times}}</ref>

[[File:Seattle - Rainier Avenue overpass, 1954 (22651065004).gif|thumb|right|Rainier Avenue overpass, 1954]]

;Timeline<ref>https://books.google.com/books?id=FYc2AQAAMAAJ&pg=PA28#v=onepage&q&f=true</ref>{{rp|24}}
*1954: Bond measure plans to build viaduct from Connecticut Street at Alaskan Way Viaduct to Rainier Avenue<ref>{{cite news |last=Cunningham |first=Ross |date=October 24, 1954 |title=Bond Issue Would Provide Funds For Huge Traffic Project |page=14 |work=The Seattle Times}}</ref>
*May 1954: Rainier Avenue overpass opens to traffic ($2 million cost), providing connection to Corwin Place, which continues to Dearborn with no signal<ref>{{cite news |date=May 6, 1954 |title=Rainier Avenue Overpass Due To Open May 15 |page=37 |work=The Seattle Times}}</ref>
**Officially the "Rainier-Lakeway Interchange"<ref>{{cite news |date=May 16, 1954 |title=Rainier Ave. Overpass Officially Opens |page=28 |work=Seattle Post-Intelligencer}}</ref>
**Construction began in April 1953<ref>{{cite news |last=Fish |first=Byron |date=June 5, 1953 |title=Overpass 'Sidewalk Supervised' |page=18 |work=The Seattle Times}}</ref>
**Intended to relieve congestion caused by floating bridge, required demolition of buildings<ref>{{cite news |date=March 31, 1953 |title=Building Removal Angers Owner |page=10 |work=The Seattle Times}}</ref>
*1956: Parallel span for floating bridge proposed<ref>{{cite news |date=July 17, 1956 |title=Parallel Span Vital Regardless of Other Sites, Says Engineer |page=1 |work=The Seattle Times}}</ref>
*1957: Engineering studies by Department of Highways to determine routing of I-90 between I-5 and Factoria, later incorporated into PSGC long-range plan in 1960
**Estimated cost of $63.7 million for eight-lane parallel spans and six-lane highway from I-5 to Factoria<ref>{{cite news |date=November 14, 1957 |title=Explanation Of Bridge Costs Sought |page=25 |work=The Seattle Times}}</ref>
*[https://books.google.com/books?id=AoY2AQAAMAAJ&lpg=PA8&ots=NR8lrimNTt&dq=%22Corwin%20Place%22%20US%20Highway%2010&pg=PA8#v=onepage&q&f=false 1960s background] from 1982 EIS
*March 1963: Public hearings inspire Mercer Island backlash
**May 1963: Federal approval for northerly alignment requested and granted
*August 1964: Construction on Connecticut Street Interchange begins for I-5 project
**"Ramps to nowhere" completed in December 1966
*Design report released in 1966 and approved by PSCG
**[https://books.google.com/books?id=Mbc2AQAAMAAJ&lpg=PA853&ots=6DQ3f8qsdf&dq=%22Corwin%20Place%22%20US%20Highway%2010&pg=PA853#v=onepage&q=%22Corwin%20Place%22%20US%20Highway%2010&f=false Early design] with parallel freeway
**8-lane tunnel under Mount Baker Ridge proposed with parallel bridge in November by state Highway Department to state commission<ref>{{cite news |last=Barr |first=Robert A. |date=November 22, 1966 |title=8-Lane Tunnel Would Link Bridge and Mainland |page=6 |work=The Seattle Times}}</ref>
*1968/70: Forward Thrust proposal fails at the ballot
*1969: Construction begins on South Bellevue Interchange and East Channel Bridge upgrade
**East Channel halted in December 1970 due to public concerns, resumes in May 1979; old bridge demolished from August 1981 to July 1982<ref name="Reporter-1984"/>{{rp|14}}
*May 1970: Lathan v. Volpe filed in District Court, seeking injunction against property acquisition related to NEPA
**Initially denied, but granted in May 1972 (lifted in 1979)
*1970: Mercer Island lid proposed as mitigation measure, championed by new mayor Aubrey Davis<ref>{{cite news |last=Schwartz |first=Susan |date=October 10, 1971 |title=Sunken freeway looms as Mercer Island choice |page=A15 |work=The Seattle Times}}</ref><ref>{{cite news |date=October 31, 1971 |title=Mercer Island: I-90 plan gets mixed reception at hearing |page=A14 |work=The Seattle Times}}</ref><ref>{{cite news |last=Pryne |first=Eric |date=November 10, 1976 |title=Mercer Is. view of I-90: Negotiators slugged it out with the 'giant' |page=H1 |work=The Seattle Times}}</ref>
**Replaced earlier plan for elevated guideway and large cuts in hills; 10 lanes wide, 3,000-foot tunnel under First Hill (west side) with vent towers; reconnecting of Luther Burbank Park
*June 1971: Recommendation of 4-2-4 plan as part of Draft EIS
*1971: Protests
*November 3, 1971: State highway commission approves plan to build Seattle section
*1973: Federal appeals court decision requires new hearings and EIS
*1973 status: Tanner to Asahel Curtis (13.2 mi) and Factoria to Issaquah (8.1 mi) under construction, Echo Lake to Tanner via North Bend (7.3 mi), Snoqualmie (5.6 mi), and Seattle (3.1 mi) held by litigation, other sections delayed by environmental review<ref>{{cite news |last=Burt |first=Lyle |date=December 12, 1973 |title=It will be clear sailing up Interstate 90—by 1980 or '81 |page=C4 |work=The Seattle Times}}</ref>
*1974: City council decision
**Lobbying by Tunks<ref name="Times-1993Timeline"/>
**Public opinion turns against freeways, but remains supportive of I-90<ref name="Times-1993Timeline"/>
*December 22, 1976: Agreement signed by parties
*1977: EIS prepared
*Royer administration reevaluates sections, requests transit lanes (reversible express lanes)
**1978 agreement signed, despite unclear federal allowance
*1980: Carter administration cuts Interstate funding, temporarily dooming project
**Restored by Reagan in 1981
*1982: Legislature approves $48 million to resume work on I-90<ref>{{cite news |last=Anderson |first=Ross |date=March 4, 1982 |title=Legislature revives I-90 project |page=A1 |work=The Seattle Times}}</ref>

;Construction
*1981: "Bulge" removed from old bridge, permanently ending bridge openings for boat traffic
**Pontoon floated to Alaska in 1982<ref>{{cite news |last=Gough |first=William |date=November 12, 1982 |title=Piece of I-90 bulge sails north to Alaska |page=B2 |work=The Seattle Times}}</ref>
*November 1983: First bore<ref>{{cite news |last=Gough |first=William |date=September 23, 1983 |title=Digging to begin on unique I-90 circle-of-holes tunnel |page=A1 |work=The Seattle Times}}</ref> in expanded Mount Baker Tunnel completed, but later found to be off alignment
*1983: First pontoons for new bridge built at Port of Everett and floated to bridge site<ref>{{cite news |date=October 1, 1983 |title=Gawkers slow traffic |page=A6 |work=The Seattle Times}}</ref>
**Found to be leaking<ref>{{cite news |date=January 4, 1984 |title=Concrete pontoon for I-90 floating bridge leaks |page=C3 |work=The Seattle Times}}</ref>
*1983: Work on Mercer Island begins<ref>{{cite news |last=Williams |first=Scott |date=March 20, 1991 |title=I-90 project stirs up dust, anger |page=G3 |work=The Seattle Times}}</ref>
**Businesses shut down due to freeway construction<ref>{{cite news |last=Patel |first=Roxanne |date=June 29, 1993 |title=Mercer Island business district hurting |page=D1 |work=The Seattle Times}}</ref>
*Groundbreaking in 1984?
*March 1986: Excavation of new three-level Mount Baker Ridge Tunnel completed<ref>{{cite news |last=Gough |first=William |date=March 13, 1986 |title=The light at the end of the I-90 tunnel |page=D1 |work=The Seattle Times}}</ref>
**Tunnel completed in August 1988<ref>{{cite news |last=Case |first=Frederick |date=August 9, 1988 |title=Dig this party! With light now at the end of the tunnel, this bash to celebrate the Mount Baker I-90 shaft should be anything but boring |page=F1 |work=The Seattle Times}}</ref>
**From top to bottom: trail, westbound, reversible lanes
**2,900 feet long, $140 million, computer controlled<ref>{{cite news |last=Johnston |first=Steve |date=April 26, 1988 |title=New tunnel will have some new features |page=C3 |work=The Seattle Times}}</ref>

;Project phases and timeline<ref name="Reporter-1984"/>{{rp|7}}
*Mercer Island interim roadway and temporary connections: 1983 to 1985
*Mercer Island excavation (westbound and center): 1984 to 1987
*Mercer Island Lids: 1985 to 1987
*Burbank to East Channel Bridge: 1985 to 1987
*Mercer Island eastbound lanes: 1988 to 1992
*Bellevue: 1988 to 1990
**Plans in 1966<ref>{{cite news |last=Barr |first=Robert A. |date=November 22, 1966 |title=8-Lane Tunnel Would Link Bridge and Mainland...Girder-Type East Channel Span Would Be 'First' |pages=6–7 |work=The Seattle Times}}</ref>
*New bridge: 1982 to 1988
*Mount Baker Tunnel expansion: 1983 to 1986
*Ramps to Nowhere: 1984 to 1986
*Seattle segments: 1986 to 1992 (westbound finished in 1988)

;Openings
*July 1981: New East Channel Bridge opens to westbound traffic ($16 million)<ref>{{cite news |date=July 8, 1981 |title=Go West—on new East Channel bridge |page=F2 |work=The Seattle Times}}</ref>
**Higher than old bridge, allowing for taller ships to pass under
**Only half-completed, with piers for expansion
**Old 1939 bridge closed on August 10<ref>{{cite news |date=August 11, 1981 |title=East Channel's new bridge gets a tryout |page=C1 |work=The Seattle Times}}</ref> and demolished by July 1982
*September 4, 1984: Mercer Island interim roadway opened in 2-2-2 configuration (including HOV lane in peak direction and express lanes)<ref name="Reporter-1984">{{cite news |date=August 31, 1984 |title=I-90: What It Means To You |pages=3–4 |work=Mercer Island Reporter |via=''The Seattle Times''}}</ref>
*November 1988: I-5 to Rainier westbound (three-lane) section opened;<ref>{{cite news |last=Gough |first=William |date=November 16, 1988 |title=I-90 to I-5 with no hassle; Ramp opening next week ends the stop-light stopgap route |page=A1 |work=The Seattle Times}}</ref>
**Ramps to nowhere incorporated
*May 29, 1989: Ceremonial opening of Hadley Bridge and "completed" I-90
**Only the westbound lanes finished, temporarily carrying all traffic while old bridge is retrofitted
**June 23: Murrow Bridge and eastbound tunnels close for retrofit<ref>{{cite news |last=Gough |first=William |date=June 22, 1989 |title=That'll be one bridge–to go |page=A1 |work=The Seattle Times}}</ref>
**Bicycle and pedestrian trail?{{cn}}
*June 4, 1989: Mount Baker Tunnel's westbound lanes open to traffic; lid inaugurated<ref>{{cite news |last=Gough |first=William |date=May 22, 1989 |title=A sweeping new concrete ribbon |page=B1 |work=The Seattle Times}}</ref>
**Eastbound lanes open June 26
**Lid landscaped as a park in 1990<ref>{{cite news |last=Angelos |first=Constantine |date=June 8, 1990 |title=Park for I-90 lid likely to have active-sports features |page=B3 |work=The Seattle Times}}</ref>
**Renamed for councilman Sam Smith in 1998
*November 25, 1990: Center pontoons of Murrow bridge sink because of water left in open pontoons by workers during storm<ref>https://www.nytimes.com/1990/11/26/us/pontoon-bridge-sinks-in-flooding-as-seattle-is-battered-by-storms.html</ref>
**Hydroblasting used to remove roadtop concrete as part of rehabilitation<ref>{{cite news |last1=Judd |first1=Ron |last2=Wilson |first2=Duff |date=December 2, 1990 |title=Water: Enigma on old I-90 bridge |page=A1 |work=The Seattle Times}}</ref>
**New bridge closed for inspection of damaged anchors,<ref>{{cite news |last1=Whitely |first1=Peyton |last2=Montgomery |first2=Nancy |date=November 26, 1990 |title=New bridge in danger–It's a commuter's nightmare |page=A1 |work=The Seattle Times}}</ref> but reopens on November 27 (westbound only, thanks to temporary anchors and being held in place by tug boats)<ref>{{cite news |last1=Williams |first1=Marla |last2=Nalder |first2=Eric |last3=Norton |first3=Dee |last4=Guillen |first4=Tomas |date=November 27, 1990 |title=Bridge opened one way; Traffic cleared westbound only as tugs keep span stable |page=A1 |work=The Seattle Times}}</ref> carrying both directions on December 3,<ref>{{cite news |last1=Haberstroh |first1=Joe |last2=Williams |first2=Marla |last3=Angelos |first3=Constantine |date=December 3, 1990 |title=Crumpled pontoon to be removed; Congestion is reduced as eastbound lanes open |page=A1 |work=The Seattle Times}}</ref> and fully opened on December 13<ref>{{cite news |date=December 13, 1990 |title=All lanes open for eastbound bridge traffic |page=D7 |work=Seattle Post-Intelligencer}}</ref>
**Last section removed on December 11<ref>{{cite news |last=Higgins |first=Mark |date=December 11, 1990 |title=Say goodbye to the old Mercer Island floating bridge |page=B2 |work=Seattle Post-Intelligencer}}</ref>
**Replacement begins construction in November 1992, with Tacoma-built pontoons<ref>{{cite news |last=Whitely |first=Peyton |date=November 14, 1992 |title=Mercer Island bridge construction ahead of schedule |page=A1 |work=The Seattle Times}}</ref><ref>{{cite news |last=Whitely |first=Peyton |date=July 30, 1992 |title=Bridge coming together |page=B1 |work=The Seattle Times}}</ref>
*February 1992: Express lanes
*July 12, 1992: Mercer Island section's eastbound lanes completed<ref>{{cite news |last=Johnston |first=Steve |date=July 6, 1992 |title=I-90 friends, foes will break bread, not heads |page=B3 |work=The Seattle Times}}</ref><ref>{{cite news |last=Whitely |first=Peyton |date=July 12, 1992 |title=Opening of I-90 lanes ends long journey |page=B2 |work=The Seattle Times}}</ref>
**Bicycle and pedestrian trail (13.5 miles) opens on October 3<ref>{{cite news |date=October 2, 1992 |title=Bicycle and pedestrian trail on I-90 to open tomorrow |page=E3 |work=The Seattle Times}}</ref>
*September 12, 1993: Murrow bridge replacement completed, at cost of $93 million
**Marked the end of national I-90 construction, and one of the last gaps in Interstate system<ref>https://www.newspapers.com/clip/22449728/floating_bridge_finishes_interstate/</ref>
*Mount Baker Tunnel has fork<ref>{{cite news |last=Higgins |first=Mark |date=September 11, 1993 |title=I-90 sees the light at the 'in' of the tunnel |page=B1 |work=Seattle Post-Intelligencer}}</ref>

;Other details
*Mercer Island lid: 40-foot concrete wall, 13 exhaust fans, 3,800 lights<ref>{{cite magazine |last=Untermann |first=Richard K. |date=March 1995 |title=Drive, They Said |pages=34–36 |work=Landscape Architecture Magazine |volume=85 |issue=3 |publisher=[[American Society of Landscape Architects]] |jstor=44667432}}</ref>
*$123 million cost for westbound floating bridge; streamlined reversible lanes<ref>{{cite news |last=Gough |first=William |date=April 30, 1984 |title=Streamlined I-90 will cut traffic snarls, reversible lanes |page=C3 |work=The Seattle Times}}</ref>
**Old configuration (1984): 4 lanes merge into 3 at east approach to floating bridge, causing slowdowns; concrete barriers added to reverisble lanes in August 1984<ref>{{cite news |date=September 6, 1984 |title=Traffic on I-90 slows to a crawl |page=D1 |work=Seattle Post-Intelligencer}}</ref>

===Modern I-90 and upgrades===

*May 1980: Became impassible after Mount St. Helens eruption, which stranded 5,396 travelers until ash is cleared<ref>{{cite news |last1=Strick |first=Stan |last2=Burt |first2=Lyle |date=May 21, 1980 |title=Many motorists led from Eastern Washington |page=D3 |work=The Seattle Times}}</ref>
*1991: Renamed American Veterans Memorial Highway, in line with other sections of I-90<ref>{{cite news |date=April 16, 1991 |title=Bill to rename Interstate 90 sent to governor |page=B2 |work=The Seattle Times}}</ref>
*December 24, 1991: Freight train derails over I-90 at Latah Creek in Spokane, dumping cars onto the freeway and narrowly avoiding a Greyhound bus<ref>[https://www.newspapers.com/clip/37842570/rail_cars_fall_from_latah_creek_bridge/ Rail cars fall from Latah Creek Bridge]</ref>

;Recent projects
*1997–2000: Widening and new ramps in Spokane and Spokane Valley ($62.5 million)<ref>https://www.aaroads.com/washington/spokane/</ref>
**2003 to 2005: Widening in Spokane Valley to exit 291 ($37 million)
*2003: Western terminus rebuilt to accommodate improved SR 519 / Edgar Martinez Drive
**Former configuration: Looping ramp to Salvation Army (4th/Brougham) carried both directions
**New configuration: Separate directional ramps to 4th/SR 519 raised intersection; north ramp converted to westbound only
*Toll proposal<ref>https://web.archive.org/web/20131005162223/http://www.wsdot.wa.gov:80/Projects/I90/CrossLakeWATolling/default.htm</ref>
*2012–17: HOV lanes added, tunnel renovations
*Smart Highways system
*[https://www.wsdot.wa.gov/Projects/I90/SnoqualmiePassEast/History.htm Snoqualmie Pass East] project
**Hyak to Keechelus Dam: began construction in 2009, to be complete in late 2018 (adding new lane, avalanche bridges, straightened curves, replacing bridges/culverts) – $551 million
**Phase 2 to Stampede Pass interchange: construction began in 2015, to be complete in 2019 (wildlife crossing, rock slope stabliziation) – $108 million
**Snowshead removed in 2014<ref>https://blogs.sos.wa.gov/fromourcorner/index.php/2014/04/farewell-snoqualmie-pass-snowshed/</ref>
**Tolls considered as early funding source, but rejected due to public opposition<ref>http://www.spokesman.com/stories/2006/may/29/toll-possible-for-pass/</ref>

;Proposals
*Raising speed limit to 75 mph from George to Lincoln-Spokane line<ref>http://www.spokesman.com/stories/2016/may/11/washington-will-not-raise-i-90-speed-limit-to-75/</ref>

;Future
*Light rail in 2023 (and Issaquah extension in 2041)
*North Spokane Corridor at Market (with C-D lanes)<ref>https://www.wsdot.wa.gov/NR/rdonlyres/27EAC2A3-1310-4352-B869-73F0E9828F3D/0/US395NorthSpokaneCorridor2013Folio.pdf</ref>

==Auxiliary routes==
There are no [[List of auxiliary Interstate Highways|auxiliary Interstate Highways]] for I-90 in Washington. The freeway is supplemented by four current [[Business routes of Interstate 90|business routes]] in the state, serving as a signed connections to [[Interstate 90 Business (Ellensburg, Washington)|Ellensburg]], [[Interstate 90 Business (Moses Lake, Washington)|Moses Lake]], [[Interstate 90 Business (Ritzville, Washington)|Ritzville]], and [[Interstate 90 Business (Spokane Valley, Washington)|Spokane Valley]].{{fake citation needed}}

==References==
{{reflist}}

=[[Interstate 405 (Washington)]]=

==History==

*1908: Road built to connect Bellevue area to Kirkland
**1908: On April 16, by easement (No. 20,107), the Northern Pacific authorized King County to establish a public highway upon and across the right of-way at Kennydale
*1912 bond: proposed paved highway from Renton to Kirkland<ref>https://www.digitalarchives.wa.gov/Record/View/47B526DE6E5C5FE835DB6ADF4CAA7BB1</ref>
*1912 map: Bellevue to Bothell completed<ref>https://www.digitalarchives.wa.gov/Record/View/2A09EF8380759767949DD9971D8B40A5</ref>
*1932: Lake Washington Blvd. paved from Kirkland to Renton<ref>http://community.seattletimes.nwsource.com/archive/?date=20030325&slug=btabtimeline</ref>
*1937: SSH 2A designated, from Renton to Everett via Bellevue and Bothell ([https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~212157~5500256:Shell-Highway-Map-of-Washington- map])
**Bothell–Everett segment dropped in 1943; later SR 527
*1940: US 10 extended to Mercer Island, parclo interchange at Factoria built
*1948: Bypass proposed by Director of Highways Clarence B. Shain<ref>{{cite news |last=Whitely |first=Peyton |date=January 3, 2003 |title=Eastside history: I-405 radically altered life east of the lake |page=B3 |url=http://community.seattletimes.nwsource.com/archive/?date=20030103&slug=fourohfive03e |work=The Seattle Times |accessdate=}}</ref>
**1950: Incorporated into larger "East Pacific Highway" proposal between Tenino and Sumas (SR 507, 167, 405, 9), limited access highway with city bypasses; proposed by booster group<ref>{{cite news |date=December 5, 1950 |title=Highway To Canada Skipping Seattle Urged |page=40 |work=The Seattle Times}}</ref><ref>{{cite news |last=Cunningham |first=Ross |date=March 11, 1951 |title=Highway Bill Calls for Important New Roads |page=1 |work=The Seattle Times}}</ref><ref>{{cite news |date=January 4, 1951 |title=More Federal Cash Asked For Highway Care |page=22 |work=The Seattle Times}}</ref>
***Proposal dates back to early 1940s<ref>{{cite news |date=July 11, 1941 |title=New Highway To North Proposed |page=30 |work=The Seattle Times}}</ref>
***Planned extension of SSH 2A to US 99 north of Seattle<ref>{{cite news |date=August 30, 1955 |title=Overpass Speeded |page=17 |work=The Seattle Times}}</ref>
*1950: Relocated SSH 2A on Rose Hill (east of Kirkland) planned<ref>http://kirklandheritage.org/esj-timeline/esj-1947-1954.htm</ref>
**Other segments between Kingsgate and Renton opened between 1954 and 1957
*1952: Approval to build and purchase access rights<ref>{{cite book |last=Whitely |first=Peyton |year=2002 |title=A Hidden Past: An Exploration of Eastside History |chapter=Chapter 38: Interstate 405 |pages=116–119 |publisher=[[The Seattle Times Company]] |isbn=9780944912102 |oclc=51963215}}</ref>
*1950s: Engineering work on SSH 2A expansion<ref>http://community.seattletimes.nwsource.com/archive/?date=19971109&slug=2571394</ref>
*1955 Yellow Book<ref name=YBD>{{cite map |map-url = https://commons.wikimedia.org/wiki/File:Seattle,_Washington_1955_Yellow_Book.jpg |title = General Location of National System of Interstate Highways Including All Additional Routes at Urban Areas Designated in September 1955 |author = [[Bureau of Public Roads]] |scale = Scale not given |location = Washington, DC |publisher = [[Government Printing Office]] |map = Seattle and Environs |page = 41 |date = September 1955 |oclc = 4165975 |access-date =  |via = [[Wikimedia Commons]] }}</ref> shows route cutting west of Bothell
*1956/1960 approvals<ref>https://books.google.com/books?id=Bno2AQAAMAAJ&pg=PA16&lpg=PA16&dq=I-405+Renton+s+curves+1995&source=bl&ots=hLW94hrSwI&sig=YFchAu_JbLh2hXp79IHeud36A5E&hl=en&sa=X&ved=0ahUKEwiSq5aHs5_YAhVT2mMKHW-8Ad4Q6AEIazAM#v=onepage&q=1965&f=false</ref>
*1956: Survey of Bothell-Lynnwood route following Swamp Creek to "tollway"<ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll20/id/597/rec/3</ref>
**1956: Potential use of Eastside bypass for (what would become) I-5 discussed<ref>Times Editorial, June 17, 1956 (pg. 8)</ref><ref>{{cite news |last=Cunningham |first=Ross |date=June 27, 1956 |title=Expressway Work Will Begin Soon |page=2 |work=The Seattle Times}}</ref>
*1956: Wilburton to Kirkland segment of SSH 2A constructed
**1956: Potential conversion of SSH 2A
*1957: PSH 1 Renton branch (RE) designated, replacing SSH 1L and SSH 2A<ref>http://leg.wa.gov/CodeReviser/documents/sessionlaw/1957c172.pdf</ref><ref name="WSDOT-1957">https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll1/id/2841/rec/10</ref>
**US 99E designation?<ref>{{cite news |last=McDonald |first=Lucile |authorlink=Lucile Saunders McDonald |date=March 27, 1960 |title=Woodinville Faces Some Changes |page=4 |work=The Seattle Times}}</ref><ref>{{cite news |last=Schear |first=Dwight |date=March 10, 1957 |title=Senate O.K's Plan to Speed Freeway Work |page=5 |work=The Seattle Times}}</ref>
**Grading and paving underway north of Kirkland and north of Renton for PSH 1 branch<ref>{{cite news |date=July 25, 1957 |title=Road Progress East of Lake Reported Good |page=17 |work=The Seattle Times}}</ref>
*1956-11: SSH 2A completed between Kirkland and Bellevue<ref>Times, 2003</ref>
*1958-11: New overpass in Kennydale<ref>{{cite news |date=February 1, 1960 |title=Accident Laid to Lack of Walks |page=6 |work=The Seattle Times}}</ref>
*1963: Bellevue asks for Main Street overpass<ref>{{cite news |last=Lane |first=Bob |date=March 21, 1963 |title=Bellevue Officials Will Argue for New Overpass |page=33 |work=The Seattle Times}}</ref>
*1964: SR 405 designation (takes effect in 1970)
*1965: During construction, new outer bypass urged to relieve congestion by mid 1970s (I-605 proposals in later decades)<ref>{{cite news |last=Barr |first=Robert A. |date=December 1, 1965 |title=Beginning Urged Now on East Side's Traffic Problem |page=7 |work=The Seattle Times}}</ref>
*1966: Selection of Everett for Boeing 747 plant leads to calls for accelerated bypass (to serve Kent traffic)<ref>{{cite news |last=Burt |first=Lyle |date=May 7, 1966 |title=Target Dates For Everett 747 Plant Told |page=15 |work=The Seattle Times}}</ref>
*August 1966: Several sections open<ref>{{cite news |date=August 12, 1966 |title=Highway 405 Key Sections to Open |page=42 |work=Seattle Post-Intelligencer}}</ref>
**August 9: Temporary two-lane bridge over Sunset Highway at Factoria with traffic signals
**August 12: South of Sunset Highway at Factoria (replacing other temporary 2-lane configuration)
**August 19: Midlakes to Kirkland (3 miles), expanded from 2 lanes to 6 lanes

;Segments by opening date
*[https://www.wsdot.wa.gov/Projects/I405/corridor/Library.htm Environmental documents with possible context]

*Tukwila to Renton: 1965-08-31
*Downtown Renton: '''1965'''
*Renton to May Creek/Newport: '''by 1965-11''' (4 lanes)
*May Creek/Newport: '''by 1965-11'''<ref>{{cite news |last=Barr |first=Robert A. |date=November 10, 1965 |title=Paving Ordered to Ease Traffic Jam |page=1 |work=The Seattle Times}}</ref>
*Newport to Factoria: 1966-08
*Factoria Interchange: '''1971?'''
*Factoria to Downtown Bellevue (6 lanes): '''1971?''' (NBI)
*Downtown Bellevue (Midlakes) to Kirkland: 1966-08
*Kirkland to Bothell/Woodinville: '''by 1966'''
**Four lanes to NE 145th only in 1969
**Upgraded interchanges: '''by 1976'''
*Woodinville to Alderwood: 1969-11-05

===Construction timeline===
Built over Lake Washington Blvd. from Renton to Factoria, along new route in other segments

*SSH 2A expanded prior to interstate designation
**1956-10: Rose Hill (Kirkland) segment completed
**1958: Woodinville section
*1960 map: SSH 2A and PSH 1 branch shared designation up to 132nd Street, then a temp PSH 1 designation to Bothell<ref>{{cite map |year=1960 |title=Shell Street Guide and Metropolitan Map of Seattle |publisher=Shell Oil Company |cartography=H. M. Gousha Company |location=San Jose}}</ref>
*Limited seasons for construction due to glacial till and other factors (to be completed by 1972)<ref>{{cite news |last=McDonald |first=Lucile |authorlink=Lucile Saunders McDonald |date=August 25, 1963 |title=Work Progresses on By-Pass Highway |page=3 |work=The Seattle Times}}</ref>
**"Talked about for 25 years (1938)"
*1963-12: Construction on Tukwila interchange begins<ref>{{cite news |date=September 29, 1963 |title=Interchange Work To Begin Soon |page=13 |work=The Seattle Times}}</ref>
*1965-08-31: Tukwila to Renton completed<ref>{{cite news |date=August 31, 1965 |title=3 Miles of Renton Freeway Opened |page=6 |work=The Seattle Times}}</ref>
*1965: Renton to Bellevue?<ref>https://books.google.com/books?id=7xWaAwAAQBAJ&pg=PA33&lpg=PA33&dq=%22Highway+2A%22+Kirkland+Bellevue&source=bl&ots=QhAQzz0vQc&sig=qKWLYuf6k71DWbmjB6NJiQVbDFs&hl=en&sa=X&ved=0ahUKEwifs6bCuanYAhUSz2MKHe8rB5kQ6AEIPDAE#v=onepage&q=%22Highway%202A%22&f=false</ref>
*1966-08: Factoria segment completed
**Factoria interchange design disputed until 1965, county and city wanted different offramps<ref>{{cite news |last=Lane |first=Bob |date=April 18, 1965 |title=Arbitration Board May Rule May 4 on Long-Disputed Factoria Interchange |page=20 |work=The Seattle Times}}</ref>
**Interchange with US 10 (I-90) finished after 1970
*1967 map: controlled access and divided between Tukwila and NE 53rd Street near Houghton; rest to Woodinville Drive (south side of river/interchange) is signed as SR 405 and uncontrolled (but completed); extension north marked as proposed<ref>{{cite map |year=1967 |title=Seattle and vicinity |publisher=Enco |cartography=H. M. Gousha Company |location=San Jose}}</ref>
*1967-05: Construction begins on Woodinville to Swamp Creek section<ref name="SVN-1969"/>
*1967-11: Grading at SR 522 completed<ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll1/id/5165/rec/11</ref>
*1966-08: Midlakes to Kirkland completed, forming a full divided highway from Renton to Bothell<ref>{{cite news |last=Barr |first=Robert A. |date=August 10, 1966 |title=2 Sections Of Highway 405 Opening Early |page=1 |work=The Seattle Times}}</ref>
*1969-01: Factoria interchange first ramp opens<ref>{{cite news |date=January 15, 1969 |title=405 interchange opens last week |page=9 |work=Sammamish Valley News |url=http://rhs.stparchive.com/Archive/RHS/RHS01151969P11.php |via=SmallTownPapers |accessdate=}}</ref>
*1969: Woodinville to Swamp Creek (Lynnwood) completed (northbound in June; or August 5<ref name="SVN-1969">{{cite news |date=August 6, 1969 |title=Woodinville road opened Tuesday |page=9 |work=Sammamish Valley News |url=http://rhs.stparchive.com/Archive/RHS/RHS08061969P11.php |via=SmallTownPapers |accessdate=}}</ref> southbound on November 5);<ref>{{cite news |date=October 29, 1969 |title=South-bound lanes on Hwy. 405 open Nov. 5 |page=1 |work=The Enterprise |location=Lynnwood, Washington}}</ref> work began in May 1967<ref>{{cite news |date=July 30, 1969 |title=Woodinville-Area Lanes Of Interstate 405 to Open |page=8 |work=The Seattle Times}}</ref>
**Approved in 1966,<ref>{{cite news |last=Barr |first=Robert A. |date=January 30, 1966 |title=Go-Ahead Given For 4-Level Interchange |page=23 |work=The Seattle Times}}</ref> originally scheduled to be completed by 1972<ref>{{cite news |last=Burt |first=Lyle |date=May 4, 1966 |title=Road Could Serve Boeing Needs—Evans |page=1 |work=The Seattle Times}}</ref>
**Final segment, bringing all of I-405 to four lanes and grade separation<ref>{{cite news |date=October 27, 1969 |title=Ceremony To Open New Freeway Link |page=48 |work=The Seattle Times}}</ref><ref>{{cite news |last=Barr |first=Robert A. |date=October 6, 1969 |title=405 Freeway Link To Open Next Month |page=7 |work=The Seattle Times}}</ref>
*1969: Older overpasses (Brickyard/Juanita, NE 76th, NE 124th) demolished to make room for six-lane expansion<ref>{{cite news |date=November 28, 1969 |title=12 Years Old And Already Obsolete |page=1 |work=The Seattle Times}}</ref>
*November 5, 1969: Bothell to Lynnwood section dedicated; other work remains in Bellevue and Kirkland<ref>https://www.newspapers.com/article/the-daily-herald-new-freeway-link-dedica/140709258/</ref>
*1971: SR 405 renumbered to I-405 after full completion
*1972: Exit numbers installed between Tukwila and Factoria as part of trial; later implemented across the state in 1973<ref>{{cite news |date=August 20, 1972 |title=Exit the names, enter digits |page=C9 |work=The Seattle Times}}</ref>

===Later projects===
*1974: Wilburton tunnel constructed to replace earlier rail bridge
*1983: HOV lanes planned for I-405
**Under construction by 1984 from Tukwila to Lynnwood<ref>{{cite news |last=Varney |first=Val |date=May 2, 1984 |title=Renton residents review options to straighten S-curves, add lanes |page=G2 |work=The Seattle Times}}</ref>
*1984: SR 525 extension completed, including rebuilt Swamp Creek Interchange<ref>{{cite news |date=October 31, 1984 |title=Interchange at mall is nearly completed |page=F2 |work=The Seattle Times}}</ref>
*1984: Renton-area expansion to add HOV lanes<ref>https://www.seattletimes.com/seattle-news/transportation/can-3-billion-in-toll-lanes-interchanges-and-bus-rapid-transit-loosen-i-405-gridlock/</ref>
*1980s: I-90 connection to Seattle completed
*Late 1980s: 4th Street interchange in Bellevue with HOV lanes<ref>{{cite news |last=Seagaar |first=Jim |date=August 25, 1982 |title=Businessmen back I-405 plans |page=E6 |work=The Seattle Times}}</ref><ref>{{cite news |date=December 12, 1984 |title=Bellevue, retailers grapple with parking, traffic |page=H1 |work=The Seattle Times}}</ref>
**Other options considered included loop ramps and Main Street<ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll10/id/3649/rec/16</ref>
*1993: SR 520 interchange gains new ramp
*1995: Renton S-curves straightened (22 homes removed)
*2002-03: Final section of HOV lanes finished from Bothell to Lynnwood
**Relocated from shoulder to median?<ref>{{cite news |last=Whitely |first=Peyton |date=October 16, 1997 |title=HOV Q&A |page=A10 |work=The Seattle Times}}</ref>
*2008: Bellevue realignment (removal of Wilburton tunnel)
*December 2009: New lane opens southbound from Renton to Southcenter<ref>https://www.seattletimes.com/seattle-news/transportation/i-5-lane-squeeze-by-exits-irks-drivers/</ref>
*2015: HOT lanes open from Bellevue to Lynnwood
*2016: Shoulder use near Canyon Park

===Corridor improvements===
*Corridor Program (since 2002)<ref>https://www.wsdot.wa.gov/projects/I405/</ref>
**Early options studied: I-605/East Sammamish, expansion of arterial, widening of freeway<ref>{{cite news |last=Whitely |first=Peyton |date=January 24, 2000 |title=Untangling I-405 is on agenda |page=B1 |work=The Seattle Times}}</ref>
***By 1999, I-405 had become the second-busiest freeway in the state, with over 284,000 people (compared to I-5's 416K and I-90's 225K)
*HOT lanes extension to Renton (2024)<ref>https://www.seattletimes.com/seattle-news/transportation/i-405-express-toll-lanes-between-renton-and-bellevue-are-on-their-way/</ref>
*Braided ramps and new overpasses in Downtown Bellevue (2012)<ref>http://web.archive.org/web/20120622144858/http://www.wsdot.wa.gov/Projects/I405/NE8thtoSR520/</ref>
*SR 167 direct HOT/HOV interchange ramps (2019)
*2027: BRT service (delayed from 2024)
**NE 85th interchange reconstructed into three-level non-cloverleaf<ref>https://www.seattletimes.com/seattle-news/transportation/sound-transits-300-million-gamble-on-new-i-405-bus-station-in-kirkland/</ref> with $287 million from ST<ref>https://www.seattletimes.com/seattle-news/transportation/triple-deck-287m-kirkland-interchange-gets-sound-transits-green-light/</ref>
**SR 522 downgraded to signalized
**Other interchange rebuilds<ref>https://www.seattletimes.com/seattle-news/transportation/can-3-billion-in-toll-lanes-interchanges-and-bus-rapid-transit-loosen-i-405-gridlock/</ref>
*Corridor planning<ref>https://www.seattletimes.com/seattle-news/transportation/fueled-by-express-tolls-state-draws-big-plans-for-lynnwood-to-puyallup-corridor/</ref>

{{clear}}

==Transit service==

*ST Express, Metro, and CT
**History of routes?
*Stride
**Stations planned

==References==
{{reflist|2}}

=[[Interstate 705]]=

==History==

*Pacific Avenue was used by SR 16 until completion of Nalley Valley
**State maps mark it as SR 509?

;Design notes
*Called SR 509 Tacoma Spur initially, part of longer freeway through Federal Way
*Modified to not block views from Union Station
*Loop dropped?

;Construction
*February 1968: Pacific Avenue Interchange ramps open as part of SR 7 freeway<ref>{{cite news |date=February 12, 1968 |title=Interstate 5 Ramps To Be Opened in Tacoma |page=42 |work=Seattle Post-Intelligencer}}</ref>

;Planning
*1972: Funding for Tacoma Spur and Bayside Drive sought from state<ref>https://www.newspapers.com/clip/88664705/tacomans-vainly-plead-for-downtown/</ref>
*March 1978: FHWA and WSDOT recommend Interstate status<ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll14/id/1643/</ref>

;Later projects
*1991: Mayor proposes lid<ref>https://www.newspapers.com/clip/99650705/cap-tacoma-spur-to-create-plaza-mayor/</ref>

==References==
{{reflist}}

=[[Interstate 205 (Oregon–Washington)]]=

==History==

*OR 212 and OR 213 roughly parallel future I-205 corridor
**OR 212 continued west from Oregon City to Tualatin (as of 1972)<ref>[https://digital.osl.state.or.us/islandora/object/osl%3A70854/datastream/OBJ/view 1972 map]</ref>

;Planning
*Eastern bypass proposed in 1943 by [[Robert Moses]] plan
*Late 1940s: Plans for second Columbia River crossing, including option to extend Sandy Boulevadr over Government Island near current I-205 bridge site<ref>{{cite news |last=Penny |first=Herb |date=July 15, 1951 |title=Jam Remains After Years of Talk of New Span |page=20 |work=The Oregonian}}</ref>
**Twinned bridge ultimately chosen
**Government Island proposal revived in 1950s<ref>{{cite news |date=August 6, 1955 |title=Bridge EyedBy Parkrose |page=4 |work=The Oregonian}}</ref><ref>{{cite news |last=Sullivan |first=Ann |date=May 25, 1958 |title=Proposed Bridges Would End Isolation of Peaceful Islands |page=43 |work=The Oregonian}}</ref>
**Lady Island studied by both states in 1959<ref>https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll2/id/35859/rec/4</ref>
*1957: Washington survey to establish route for connecting Interstate between Salmon Creek and Hollywood Freeway (Portland)<ref>{{cite news |last=Mattson |first=V. A. |date=January 1957 |title=District 4 Makes Needs Study For Federal Interstate Highway System |page=21 |work=Washington Highway News |volume=6 |issue=7 |publisher=Washington State Department of Highways |oclc=29654162 |url=https://cdm16977.contentdm.oclc.org/digital/collection/p16977coll1/id/2578/rec/3 |via=Washington State Department of Transportation Library Digital Collections |accessdate=}}</ref>
*1960s: Planned I-205 causes development boom in northeast Vancouver that lasts into 1970s<ref>{{cite news |last=Bacon |first=Leonard |date=November 22, 1977 |title=I-205 bridge to have heavy impact on East County shopping |page=E3 |work=The Oregonian}}</ref>
*October 1966: Final throughway agreements for West Linn, Oregon City, and Gladstone approved by commission<ref>{{cite news |date=October 7, 1966 |title=State Approves Engineering Agreements For Fremont, West Linn Bridges |page=28 |work=The Oregonian}}</ref>

;Construction

*May 28, 1970: Willamette River Bridge dedicated and opens
**2,717 feet long (main span: 430 feet), cost $17.1 million<ref>{{cite news |last=Goranson |first=Eric |date=May 29, 1970 |title=New Span on Willamette: High, Wide, Handsome; First I-205 Link Opened By McCall |page=J4 |work=The Oregon Journal}}</ref>
*December 15, 1982: Jackson Bridge opened, cost $175 million (most expensive in Oregon history)<ref>{{cite news |last=Meyer |first=Denise |date=December 15, 1982 |title=New bridge to trim freeway traffic |page=9 |work=Corvallis Gazette-Times |agency=Associated Press |url=https://www.newspapers.com/clip/21286369/glenn_jackson_bridge_dedication_with/ |via=Newspapers.com |accessdate=}}</ref>
**Proposed since 1965, authorized in 1976, construction began on August 23<ref name="Columbian-Bridge2009">{{cite news |last=Mize |first=Jeffrey |date=May 4, 2009 |title=I-205 project, 30 years ago: A bridge without battles |page=A1 |work=The Columbian}}</ref>
**Initial work began in 1970 despite lawsuits<ref>{{cite news |last=Federman |first=Stan |date=October 1, 1970 |title=Work To Begin On I-205 Bridge Over Columbia Despite Pending Lawsuit |page=32 |work=The Oregonian}}</ref>
**Planned to open in mid-1983 (or 1984),<ref>{{cite news |last=Federman |first=Stan |date=February 27, 1981 |title=Columbia I-205 span may not open until '84 |page=B4 |work=The Oregonian}}</ref> but accelerated by Washington state
**Opening includes Lombard section and Airport Way ramps<ref>{{cite news |last=Federman |first=Stan |date=December 7, 1982 |title=Governors to tie ribbon at opening of I-205 bridge |page=B1 |work=The Oregonian}}</ref>

;Designations
From [https://www.oregon.gov/ODOT/ETA/Documents_Geometronics/ROW-Eng_State-Highway-History.pdf History of State Highways in Oregon] (p. 64-2)

*November 15, 1977: Bridge designated the Glenn L. Jackson Bridge
*March 25, 1981: Abandonment of Lake Road / Clackamas River section (Abandonment Resolution 601)

;Other notes
*1970 cost estimate: $229.2 million total, including $43.98 million for bridge; 25.9 miles in Oregon<ref>{{cite news |date=January 8, 1970 |title=State Speeds Work On Giant Freeway Plans; 1st Section To Open In Spring |page=ME 1 |work=The Oregon Journal}}</ref>
*1970: WSDOT estimates cost of construction at $273 million<ref>{{cite news |last=Barr |first=Robert A. |date=January 5, 1970 |title=Freeway to Bypass Downtown Portland; Columbia Bridge Planned |page=A19 |work=The Seattle Times}}</ref>
*1971: Campaign to designate I-205 as a scenic highway to prevent encroachment from billboards and signs<ref>{{cite news |last=Goranson |first=Eric |date=February 3, 1971 |title=Campaign Launched To Designate I-205 Scenic Highway; Petition Presented To Scenic Area Board |page=ME2 |work=The Oregon Journal}}</ref>
*1974 cost estimate: $162 million spent to date, $55 million for later work, $116 million for bridge; $333 million total<ref>{{cite news |last=Munson |first=Alden |date=December 31, 1974 |title=I-205 Stymied By Suit |page=B8 |work=The Oregon Journal}}</ref>
*1976 EIS pamphlet by ODOT: {{cite news |date=May 9, 1976 |title=Tomorrow's I-205 |pages=182–184 |work=The Oregonian |url=https://proxy.multcolib.org:2489/apps/news/openurl?ctx_ver=z39.88-2004&rft_id=info%3Asid/infoweb.newsbank.com&svc_dat=WORLDNEWS&req_dat=0D10F2CADB4B24C0&rft_val_format=info%3Aofi/fmt%3Akev%3Amtx%3Actx&rft_dat=document_id%3Aimage%252Fv2%253A11A73E5827618330%2540EANX-NB-131CB729F565943E%25402442908-131B4FE2C99BF53D%2540181-131B4FE2C99BF53D%2540/hlterms%3A%2522Interstate%2520205%2522%253B%2520%2522Route%2520205%2522%253B%2520I-205%253B%2520%2522Highway%2520205%2522}}

;Later history
*1995: West Linn southbound rest area closes due to crime and NIMBYs
*2000: Designated as Veterans Memorial Highway<ref>{{cite news |last=Stewart |first=Bill |date=November 2, 2000 |title=Interstate 205 will be marked as memorial tribute to veterans |page=D5 |work=The Oregonian}}</ref>
**Only Oregon highway where flags are permitted<ref>{{cite news |date=November 6, 2003 |title=Briefly 3,000 cars with flags will convoy down I-205 |page=D2 |work=The Oregonian}}</ref>
*2009: 17,000 solar panels planned<ref>[https://www.oregonlive.com/news/2009/07/some_west_linn_and_oregon_city.html Debate begins on ODOT plan to install up to 17,000 solar panels on I-205]</ref>
**2008: Small grid installed at I-5 interchange in Tualatin to power 28 percent of lighting needs<ref>[https://www.oregonlive.com/environment/2008/08/oregon_installs_first_highway.html Oregon installs first highway solar project]</ref>

;Other plans
*Westside bypass plans in the 1990s, canned after lobbying from 1000 Friends of Oregon
**1967 map for Rivergate Freeway
**1988: $17 million budgeted for engineering studies and ROW acquisition<ref>{{cite news |last=Green |first=Ashbel S. |date=March 5, 1990 |title=County politicians say westside bypass plans detoured |page=B2 |work=The Oregonian}}</ref>
**1991 study
**"disappeared from serious policy debate in 1995"<ref>{{cite news |last1=Oliver |first1=Gordon |last2=Hamilton |first2=Don |date=April 30, 1999 |title=Legislators revive westside bypass idea |page=D1 |work=The Oregonian}}</ref>
**Revivals<ref>https://www.oregonlive.com/politics/2017/03/new_bypass_highway_in_washingt.html</ref>

==References==
{{reflist}}

=[[Interstate 505 (Oregon)]]=
:''Split from [[U.S. Route 30 in Oregon]]''

;Resources
*[http://library.state.or.us/repository/2015/201509281034391/index.pdf ODOT History] (2004)
*[http://www.i-505.com/site/php/i505.php?pagename=timeline.php Timeline by Eliot H. Fackler] (2009)
*{{cite news |last=Hannon |first=Buck L. |date=February 8, 1976 |title=What Good is a Bridge If You Can't Get to It? |pages=12–13 |work=The Oregonian |place=Northwest Magazine}}

==History==

*Old US 30 alignment on Burnside etc.
*Industrial Freeway proposals from 1955 onward
**Moses plan (1943)?
*1964: Protest from Willamette Heights residents<ref>{{cite news |date=January 31, 1964 |title=Citizens Protest Highway Route |page=18 |work=The Oregonian}}</ref>
*1971 lawsuit
*November 1978: Portland City Council rejects funding
*September 13, 1979: Governor Atiyeh requests withdrawl<ref>[https://www.fhwa.dot.gov/highwayhistory/data/page05.cfm Part V - Interstate Withdrawal-Substitution Program]</ref>
*December 14, 1979: USDOT cancels project, reallocates funds
*Late 1988: US 30 project finished

==References==
{{reflist}}

=[[Interstate 84 in Oregon]]=

==History==

*1964–65: Proposal to extend Interstate via US 30 to Astoria submitted by Oregon to U.S. Congress<ref>https:/upwiki/wikipedia/commons/8/83/Interstate_Highway_plan_March_30%2C_1970.jpg</ref><ref>{{cite news |date=September 26, 1964 |title=Interstate Extension To Astoria Is Sought |page=7 |work=The Oregon Statesman |url=https://www.newspapers.com/clip/21289213/astoria_interstate_extension/ |via=Newspapers.com |accessdate=}}</ref>
**HJM 18<ref>https://www.newspapers.com/clip/21289281/senate_hjm_18/</ref>

===Interstate construction===

*November 1959: First Interstate shields in state added to I-80N near Rooster Rock<ref>{{cite news |date=November 28, 1959 |title=Highway Department Places New-Type Signs on Freeways |page=3 |work=Capital Journal |url=https://www.newspapers.com/clip/21698816/new_oregon_interstate_markers/ |via=Newspapers.com |accessdate=}}</ref>
*1950s to 1970s: new surface-level route through gorge
**Several sections destroyed or usurped by new highway construction<ref>https://sos.oregon.gov/archives/exhibits/columbia-river-highway/Pages/history-bypass.aspx</ref>
**1953: Mosier to Rownea (6 mi; near The Dalles) opened<ref>{{cite news |date=October 28, 1953 |title=Columbia Highway Section Opening Due |page=5 |work=Corvallis Gazette-Times |agency=United Press International |url=https://www.newspapers.com/clip/21203735/mosierrowena_section/ |via=Newspapers.com |accessdate=}}</ref>
**July 1954 completion for all sections?{{cn}}
*By 1954: Troutdale to The Dalles water-level route completed<ref>{{cite news |date=June 13, 1954 |title=Highways Greatly Improved |page=10 |work=The Oregon Statesman |url=https://sos.oregon.gov/archives/exhibits/columbia-river-highway/Pages/history-bypass.aspx |via=Newspapers.com |accessdate=}}</ref>
*1956: 382-mile section of US 30 designated as federal aid route<ref name="OSHC-1954">{{cite book |date=October 1956 |title=Twenty-Second Biennial Report of the Oregon State Highway Commission |publisher=Oregon State Highway Commission |oclc=18475229 |url=https://catalog.hathitrust.org/Record/007931037 |via=HathiTrust |accessdate=}}</ref>{{rp|11}}
*September 15, 1956: New section of US&nbsp;30 between Emigrant Hill and Ontario opens<ref name="OSHC-1954"/>{{rp|131}}
*1956–58: Troutdale to Rooster Rock Park (7.84 mi), Mosier and Rowena (3.13 mi), Chenoweth Creek to The Dalles (1.88 mi), etc.<ref>https://babel.hathitrust.org/cgi/pt?id=uc1.b2886432;view=1up;seq=41</ref>{{rp|35}}
*July 30, 1959: Meacham to Glover (4 lanes)<ref name="LaGrande-1960">{{cite news |date=January 5, 1960 |title=$15.5 Million in Highway Work Here |page=3 |work=La Grande Observer |url=https://www.newspapers.com/clip/21082687/i80n_la_grande_projects_part_2/ |via=Newspapers.com |accessdate=}}</ref>
*November 1960: Glover to Upper Perry (2 lanes) and Upper Perry to Orodell (4 lanes)<ref>{{cite news |date=November 25, 1960 |title=Two New Highway Lanes Opened |page=1 |work=La Grande Observer |url=https://www.newspapers.com/clip/21082643/i80n_deadman_pass_section_opened/ |via=Newspapers.com |accessdate=}}</ref>
*August 31, 1962: Deadman Pass to Meacham (9.4 miles, began in late 1958)<ref name="LaGrande-1960"/>
*September 20, 1962: Emigrant Hill (Deadman Pass) to La Grande dedicated (33 miles, $15 million, 4 lanes)<ref>{{cite news |date=September 18, 1962 |title=All Plans Complete For Dedication of Freeway Thursday |page=1 |work=La Grande Observer |url=https://www.newspapers.com/clip/21082627/i80n_completed_from_emigrant_to_la/ |via=Newspapers.com |accessdate=}}</ref><ref>{{cite news |date=September 20, 1962 |title=Oregon Dedicates 4-Lane Freeway |page=3A |work=The Eugene Guard |agency=Associated Press |url=https://www.newspapers.com/clip/21723742/pendleton_to_la_grande_freeway/ |via=Newspapers.com |accessdate=}}</ref>
**Follows original Oregon Trail<ref>{{cite news |date=September 19, 1962 |title=Old Wagon Road Becomes Modern Highway in Rugged Blue Mountains |page=11 |work=[[Albany Democrat-Herald]] |url=https://www.newspapers.com/clip/21082651/i80n_deadmans_pass/ |via=Newspapers.com |accessdate=}}</ref>
*June 29, 1964: The Dalles bypass (4.6 miles, $7.9 million)<ref>{{cite news |date=June 25, 1964 |title=Ribbon Cutting Set For Highway Opening |page=12 |work=Corvallis Gazette-Times |url=https://www.newspapers.com/clip/21202363/the_dalles_freeway_opening/ |via=Newspapers.com |accessdate=}}</ref>
*1967: Additional work near Troutdale completed?{{cn}}
*October 28, 1969: Tooth Rock tunnel (renovated) and viaduct (new) opened; final freeway segment/bottleneck between Portland and Pendleton<ref>{{cite news |date=October 22, 1969 |title=I-80 Tunnel Opening Set |page=22 |work=Capital Journal |url=https://www.newspapers.com/clip/21198135/tooth_rock_section_opens/ |via=Newspapers.com |accessdate=}}</ref>
*November 1969: Pendleton bypass opened?{{cn}}
*As of December 1969: Tooth Rock Tunnel, 9.3 miles near Pendleton<ref>{{cite news |date=January 1, 1970 |title=U.S. Road Aid Tops $256 Million In NW |page=9 |work=The Oregon Journal}}</ref>
*By 1970: 4-lane and interchange added to gorge section{{cn}}
*1972: 62 miles of I-80N under construction; all four-lane execpt for Ladd Canyon/North Powder in Baker County<ref>{{cite news |last=Harvey Jr. |first=Paul W. |date=January 14, 1972 |title=Freeway to lead to Ontario |page=16 |work=Capital Journal |agency=Associated Press |url=https://www.newspapers.com/clip/21723663/eastern_oregon_section_of_i80n/ |via=Newspapers.com |accessdate=}}</ref>
*1973: All complete, but Super-2 sections remained between Boardman and Pendleton{{cn}}
**La Grande to North Powder<ref>http://library.state.or.us/repository/2012/201210161155482/index.pdf</ref>{{rp|B3}}
*July 3, 1975: Baker City dedicated (completing I-80N)<ref>{{cite news |date=July 3, 1975 |title=Interstate 80N Rites Today |page=7 |work=The Oregon Statesman |url=https://www.newspapers.com/clip/21290474/i80n_dedication_near_baker/ |via=Newspapers.com |accessdate=}}</ref>

;Banfield
*1926: High-speed expressway through Sullivan Gulch studied by city<ref>http://sgnablog.blogspot.com/2010/12/long-illustrious-history-of-sullivans.html</ref>
**to follow existing railroad
*1947: Gulch expressway plans revived; attempted renaming to "Sullivan Gulch Pike" fails
*1953: First bids<ref>https://www.newspapers.com/image/125822249/?terms=Troutdale+highway</ref>
*October 1, 1955: Banfield from Hollywood (42nd) to Troutdale opened<ref name="OSHC-1954"/>{{rp|19}}
**No shoulder, no center barrier (several crashes)<ref>{{cite news |last1=Trevison |first1=Catherine |last2=Franzen |first2=Robin |date=August 11, 2005 |title=Banfield offers entry to new era |page=1 |work=The Oregonian}}</ref>
***Caused sprawl in Gresham
**1957: Rest of Banfield

;Mount Hood
*I-80N designation to use new freeway along US 26 corridor south of Banfield, US 30 to use Banfield<ref>{{cite news |last=Yocom |first=Doug |date=August 7, 1969 |title=Freeways in Our Future: Safety Keeps Experts Pulling Their Hair |page=2 |work=The Oregon Journal}}</ref>
*1972: Lawsuit filed against plan
*1975: Proposal withdrawn; funds used for MAX

;Renumbering
*1958: I-82N becomes I-80N, as compromise over I-80 designation
*1977: Proposed renumbering to I-84 by Utah and Idaho, opposed by Oregon due to cost
**Idaho proposal: I-84 along I-15W to Pocatello, but conditionally approved in July on the whole I-80N corridor
*October 1977: Oregon agrees to renumbering, to cost $187,000 (90% federal)<ref>{{cite news |date=October 19, 1977 |title=Freeway 80N to become I-84 |page=7A |work=The Oregon Statesman |agency=Associated Press |url=https://www.newspapers.com/clip/21196951/i84_designation_approved_by_oregon/ |via=Newspapers.com |accessdate=}}</ref>
*AASHO denies renumbering initially
*Approved in August 1979, as part of un-suffixing, and to be done by May 1<ref>{{cite news |date=August 7, 1979 |title=I-80N up for name change |page=10A |work=The Oregon Statesman |agency=United Press International |url=https://www.newspapers.com/clip/21197030/i80n_up_for_name_change/ |via=Newspapers.com |accessdate=}}</ref><ref>{{cite news |date=September 6, 1979 |title=Interstate across Idaho will be I-84 |page=C3 |work=[[Times-News (Idaho)|Times-News]] |location=Twin Falls, Idaho |agency=Associated Press |url=https://www.newspapers.com/clip/21197049/interstate_across_idaho_will_be_i84/ |via=Newspapers.com |accessdate=}}</ref>
*1980: Officially changed on May 1, with sign removal beginning two years earlier<ref>{{cite news |date=April 3, 1980 |title=Interstate 80N will become Interstate 84 on May Day |page=1B |work=Statesman Journal |url=https://www.newspapers.com/clip/21066357/i80n_becomes_i84/ |via=Newspapers.com |accessdate=June 18, 2018}}</ref<ref>{{cite news |date=April 18, 1980 |title=Interstate 80N changed to 84 |page=12 |work=Corvallis Gazette-Times |agency=Associated Press |url=https://www.newspapers.com/clip/21066361/i84_signage/ |via=Newspapers.com |accessdate=}}</ref>

===Later years===

*1986: Banfield expanded from four to six lanes; MAX light rail added
*2014: Vietnam Veterans Memorial Highway designation (matching Idaho)
*2016: Safety improvements between Pendleton and La Grande, including variable speed zones

==References==
{{reflist}}

=[[Interstate 5 in Oregon]]=

*[http://www.oregonhighways.us/html_files/Highways/hwy-001.html Rough timeline]
*[https://www.newspapers.com/clip/24306281/highway_99_plans/ 1960 timeline] (Eugene to Ashland)

==History==

*Pacific Highway auto trail championed by good roads groups in 1910s
**Split between West and East Valley leads to suffixed routes

;Freeway construction<ref>http://www.oregonhighways.us/html_files/Routes/i-005.html</ref>
*1952-1954: "New Pacific Highway" planned on entirely new alignment for expressway-grade construction<ref name="ODOT-IH"/>{{rp|14}}
**47-mile corridor from Portland to Salem, estimated to cost $11 million<ref>https://www.newspapers.com/image/96107332/?terms=Pacific%2Bfreeway</ref>
*Gradually extended south from original freeway to Salem
*R.H. Baldock Freeway construction begins in 1954, completed in 1961<ref>{{cite news |last=Farrell |first=Peter |date=November 22, 1996 |title=On the whole, I-5 still in pretty good shape |page=A21 |work=The Oregonian}}</ref>
**First highway contract awarded in January 1959<ref name="AP-Hatfield66">https://www.newspapers.com/clip/21204327/gov_hatfield_dedicates_interstate_5/</ref>
**Originally named Portland-Salem Expressway; renamed for retiring highway engineer R.H. Baldock in July 1956<ref>https://www.newspapers.com/clip/21700803/baldock_tribute/</ref>
***Governor Martin suggested<ref>https://www.newspapers.com/clip/21700544/salem_freeway_name/</ref>
*November 1, 1954:{{cn}}<ref>{{cite news |date=October 31, 1954 |work=The Oregonian}}</ref> Wilsonville to Tigard paved and grade-separated, but no intermediate interchanges<ref>https://www.newspapers.com/clip/21786889/barbur_to_wilsonville_expressway/</ref>
**Wilsonville (Boone) bridge partially opened on July 1 to replace ferry<ref>https://www.newspapers.com/clip/21700635/boone_ferry_replacement/</ref>
*November 1, 1954: Salem bypass opens (9.5 miles, $2.6 million)<ref>https://www.newspapers.com/clip/21700700/salem_bypass_opened_to_traffic/</ref><ref>https://www.newspapers.com/clip/21700696/salem_bypass_opened/</ref>
*November 1, 1955: Salem to Wilsonville section opens (25 miles)<ref>https://www.newspapers.com/clip/21700503/salem_to_wilsonville_freeway_opened/</ref>
**2-lane section remains between Brooks and Broadacres
**Completion of Portland-Salem expressway is the longest toll-free expressway in the United States, cutting 20 minutes from travel time<ref name="ODOT-IH2004"/>
*35.7-mile expressway rebuilt and expanded to four lanes from May 2<ref>https://www.newspapers.com/clip/21700768/baldock_expressway_reopening/</ref> to August 10, 1956, dedicated to Baldock<ref>https://www.newspapers.com/clip/21700774/baldock_freeway_reopens/</ref>
**Cost $13.2 million to repave and rebuild<ref>https://www.newspapers.com/clip/21700785/baldock_expressway_blurb/</ref>
*By late 1959: completed from Goshen to Canyonville, Albany to Portland<ref>https://www.newspapers.com/clip/21693498/interstate_5_overview_1959/</ref>
*1959: Myrtle Creek to Canyonville{{cn}}
*1958–59: Albany to Salem
**October 28, 1958: Albany to Salem section opens, with exception of Santiam River bridge (11 miles)<ref>https://www.newspapers.com/clip/21701098/albany_freeway/</ref><ref>https://www.newspapers.com/clip/21701105/albany_freeway_opening_announced/</ref>
**January 24, 1959: Santiam River bridge opens west of Jefferson<ref>https://www.newspapers.com/clip/21701051/santiam_bridge_opens/</ref>
**April 14: Murder Creek section (2 miles) opens<ref>https://www.newspapers.com/clip/21701041/north_albany_freeway/</ref><ref>https://www.newspapers.com/clip/21701048/north_albany_section/</ref>
**November 25, 1959: Albany bypass, from OR 39 to North Albany (5 miles)<ref>https://www.newspapers.com/clip/21692871/albany_freeway_opening/</ref>
*August 1960: Halsey to Albany area (11.5 miles)<ref>https://www.newspapers.com/clip/21692303/albany_to_halsey_freeway_opening/</ref>
**Longest straight freeway in Oregon<ref>https://www.newspapers.com/clip/21698544/eugenealbany_freeway_planning/</ref>
*November 10, 1960: Eugene/Q Street (OR 126/I-105) to Halsey (25 miles)<ref>https://www.newspapers.com/clip/21692460/eugene_to_halsey_freeway_opened/</ref>
**6-mile segment near Halsey remains two lanes until next spring
*December 1, 1961: Portland freeway from Tigard to Harbor/Ross bridge opens (6.6 miles, $16.4 million)<ref>https://www.newspapers.com/clip/21698302/southwest_portland_freeway/</ref>
**Routing decided in 1956
**Full dedication of Baldock Freeway
*December 5, 1961: Eugene bypass and Judkins Point bridge opens ($4 million), marking completion of 105-mile Baldock Freeway<ref>https://www.newspapers.com/clip/21665620/eugene_freeway_bridge_completed/</ref><ref>https://www.newspapers.com/clip/21698467/eugene_bridge_and_bypass_opens/</ref>
**Highway 99 designation to be kept on local roads through Eugene, per merchant request
**Signs removed beginning late December 1961<ref>https://www.newspapers.com/clip/21665349/baldock_freeway_signs_removed/</ref><ref>https://www.newspapers.com/clip/21698586/oregon_interstate_markers/</ref>

;Southern Oregon
*August 31, 1956: US 99 upgraded between Creswell and Cottage Grove for $4.47 million<ref>https://www.newspapers.com/clip/86115997/ceremonies-to-inaugurate-new-freeway/</ref>
*January 1957: Medford viaduct route adopted<ref>{{cite news |date=January 23, 1957 |title=Highway Commission Adopts Hawthorne Park Bypass For Interstate Construction of U.S. 99 in Medford Area |page=6 |work=The Oregonian}}</ref>
*November 9, 1958: Grants Pass to Jumpoff Joe Creek (6.5 mi, $2.1 million)<ref>https://www.newspapers.com/clip/24306560/grants_pass_freeway_extension/</ref>
*November 19, 1958: Myrtle Creek to Canyonville (6.36 mi, $4.572 million);<ref>https://www.newspapers.com/clip/24306486/myrtle_creek_freeway/</ref> last bypass of a Douglas County city<ref>https://www.newspapers.com/image/94035402/?terms=freeway</ref>
*September 20, 1961: Rogue River to Rock Point/Gold Hill dedicated 2 weeks after opening (6 miles)<ref>https://www.newspapers.com/clip/21723910/rogue_river_freeway_dedication/</ref>
*June 1, 1962: Grants Pass to Rogue River dedicated (10 miles, $10 million)<ref>https://www.newspapers.com/clip/21697997/grants_pass_freeway_dedicated/</ref><ref>https://www.newspapers.com/clip/21697987/grants_pass_to_rogue_river_freeway/</ref>
**Third-longest continuations freeway in Oregon at 24 miles<ref>https://www.newspapers.com/clip/21698106/grants_pass_blurb/</ref>
*August 1962: Rice Hill to North Oakland 7.2 miles)<ref>https://www.newspapers.com/clip/24306357/oakland_and_rice_hill_section_opens/</ref>
*December 20, 1962: Medford viaduct opens<ref>https://www.newspapers.com/clip/21664737/medford_dedication/</ref><ref>https://www.newspapers.com/clip/21664433/medford_viaduct_dedication_ceremony/</ref><ref>https://www.newspapers.com/clip/21664410/medford_viaduct_dedication/</ref><ref>https://www.newspapers.com/clip/21664375/medford_viaduct_dedication/</ref>
**Subject to routing dispute in 1956; other options considered were a western bypass, or Genesee Street residential area
*1962: 36 miles opened (Grants Pass to Rogue River, Gold Hill to Medford, Rice Hill to North Oakland)<ref>https://www.newspapers.com/clip/21664876/oregon_interstates_in_1962/</ref>
*January 11, 1963: Goshen to Creswell<ref>https://www.newspapers.com/clip/24306024/goshen_and_creswell_freeway/</ref>
*September 4, 1963: Cottage Grove to London Road (2.5 mi)<ref>https://www.newspapers.com/clip/24306109/cottage_grove_freeway_extension/</ref>
*December 21, 1965: Northbound lanes of Siskiyou Summit segment opens (11.45 miles, Ashland to CA border)<ref>https://www.newspapers.com/clip/21701245/siskiyou_northbound_lanes_open/</ref>
**June 21, 1966: Southbound lanes open<ref>https://www.newspapers.com/clip/21701215/siskiyou_freeway_opens/</ref>
**Required extensive earthworks<ref name="ODOT-IH2004"/>
**December 21, 1966: Northbound lanes open
*I-5 dedicated on October 22, 1966, at Cow Creek (near Glendale)<ref name="ODOT-75th"/>{{rp|5B}}
**First freeway to be completed from state to state;<ref name="ODOT-IH2004"/> I-5 would be completed through Washington in 1969 and California in 1972
**Estimated cost of $298 million (92.28 federal); 18 rest areas (9 pairs), 114 interchanges, 467 bridges, 80 million cu yards of dirt, 18 percent of traffic<ref name="AP-Hatfield66"/>
**Impact: small-town merchants hurt<ref>https://www.newspapers.com/clip/21701195/i5_impact_on_oregon_towns/</ref>
*Remaining section (25 mi): Jumpoff Joe Creek and Canyonville{{cn}}

;East Bank/Minnesota Freeway
*1943 Moses plan: Closer to river<ref>{{cite book |last=Moses |first=Robert |author-link=Robert Moses |date=November 10, 1943 |title=Portland Improvement |pages=32, 34 |publisher=Multnomah County |url=https://www.portlandmercury.com/images/editorial/20090930/Portland%20Improvement%20-%20Robert%20Moses%201943.pdf |via=[[Portland Mercury]] |accessdate=}}</ref>
*1950s: Routing controversy
**Albina (majority black area) chosen<ref>https://www.theatlantic.com/business/archive/2016/07/racist-history-portland/492035/</ref><ref>https://www.oregonlive.com/commuting/2020/07/gov-kate-brown-i-5-rose-quarter-widening-will-not-happen-without-support-of-portlands-black-community.html</ref>
*1959: Commission chooses route along Minnesota/Missouri avenues
**ROW acquisition begins<ref>{{cite news |last=Ostergren |first=Jack |date=June 2, 1964 |title=Portland Freeways Growing; More Concrete Lanes Slated |page=2 |work=The Oregon Journal}}</ref>
**Construction requires severing of 51 streets<ref>{{cite news |date=June 22, 1961 |title=Minnesota Freeway To Sever 51 Streets |page=1 |work=The Oregon Journal}}</ref>
*1959: Portland City Council to pay 25% of cost for Eastside Esplanade ($80,000) after BPR denies funds; 45-foot walkway to beautify waterfront<ref>{{cite news |date=October 27, 1959 |title=City Offers to Pay Quarter of Expense Of 45-Foot-Wide East Bank Esplanade |page=1 |work=The Oregonian}}</ref>
*Construction required destruction of 180 homes (began 1959), relocation of 400 residents<ref name="ODOT-IH2004">[http://library.state.or.us/repository/2015/201509281034391/index.pdf Interstate Highway System in Oregon] (2004)</ref>
*Completed 1962 to 1963<ref name="ODOT-IH2004"/>
*December 3, 1964: Final section opens<ref>https://www.newspapers.com/clip/21701278/minnesota_freeway_in_portland/</ref>

*October 18, 1966: Marquam Bridge finished, completing all of Oregon's I-5{{cn}}
*November 1, 1966: Tolls and last traffic light removed on Interstate Bridge{{cn}}

;Later projects
*1969: Widening approved for Wilsonville to Salem, requiring demolition and replacement of 25 bridges<ref>{{cite news |last=Yocom |first=Doug |date=August 8, 1969 |title=Freeways in Our Future: Wider Road Costly Headache |page=2 |work=The Oregon Journal}}</ref>
*1971: New mileposts and exit numbering<ref>https://www.newspapers.com/clip/21698152/oregon_milepost_markers_and_interchange/</ref>
*1973: Portland to Salem widening (6 lanes)
*Harbor Drive cancelled
*1970s: Salem widening
*1970: Wilsonville bridge widened to six lanes
**1998: $4 million seismic retrofit
*1990–94: Marquam Bridge widened to six lanes, including new approaches to eliminate tight curve<ref>{{cite news |last=Mayer |first=James |date=September 25, 1990 |title=Marquam Bridge work to begin |page=B10 |work=The Oregonian}}</ref>
**Seismic retrofit also included in response to 1989 SF earthquake

;Recent history
*August 1988: 21-vehicle accident near Albany kills 7 people, caused by smoke burning<ref>https://www.oregonlive.com/data/2015/02/smoky_21-vehicle_pileup_kills.html</ref>
*November 25, 1996: Sinkhole at Umpqua River near Roseburg (50 feet deep, 100 feet long) closes northbound lanes after swallowing two trucks and injuring drivers<ref>{{cite news |last1=Tims |first=Dana |last2=Larrabee |first2=Mark |last3=Brinckman |first3=Jonathan |date=November 22, 1996 |title=Sinkhole on I-5 swallows two tractor-trailers near Roseburg |page=A1 |url=https://www.oregonlive.com/pacific-northwest-news/index.ssf/1996/11/sinkhole_on_i-5_swallows_two_t.html |work=The Oregonian |accessdate=}}</ref>
**All four lanes reopen on November 25<ref>{{cite news |date=November 25, 1996 |title=Four lanes of Interstate 5 reopen after sinkhole filled |page=B2 |work=The Columbian |agency=Associated Press}}</ref>
*1998: HOV lane between Going and Marine added to NB lanes<ref>https://www.koin.com/news/after-17-years-hov-lane-still-a-pilot-project_20180208085942953/960252755</ref>
*2009–2013: New [[Whilamut Passage Bridge]] built to replace Judkins Point (1961)

;Proposals
*[[Columbia River Crossing]] project (ended in 2013)
*Rose Quarter lane expansion controversy<ref>https://www.portlandmercury.com/feature/2017/09/06/19295909/oregons-450-million-plan-to-widen-i-5-has-portlanders-preparing-for-war</ref>
**Effects on schools<ref>https://www.oregonlive.com/education/2019/03/portland-schools-officials-arent-buying-states-environmental-assessment-of-rose-quarter-freeway-expansion.html</ref>
*Westside Bypass (proposed many times, mostly abandoned by 1990s but revived)<ref>https://www.oregonlive.com/politics/index.ssf/2017/03/new_bypass_highway_in_washingt.html</ref><ref>https://portlandtribune.com/ttt/89-news/124465-leaders-ready-to-ride-new-bypass-proposal</ref>
**Firmest proposal in 1988, abandoned after STOP and LUTRAQ alternative plan in 1996
*2012: Freeway cap proposal<ref>https://www.oregonlive.com/portland/index.ssf/2012/06/400_million_plan_to_cap_inters.html</ref>
*Marquam Bridge replacement proposals: demolition, rerouting onto I-405, or tunnel<ref>http://www.riverfrontforpeople.org/media/012002_tribune.pdf</ref><ref>https://digital.osl.state.or.us/islandora/object/osl%3A99839</ref>
**East Bank replacement<ref>https://bikeportland.org/2012/04/06/adams-releases-i-5-tunnel-concept-plan-for-public-comment-70050</ref>
***Rerouting discussed in 1986<ref>https://digital.osl.state.or.us/islandora/object/osl%3A216838#page/118/mode/2up</ref>
*2017: Toll proposal<ref>http://www.columbian.com/news/2017/jul/06/oregon-tolls-i-5-i-205-take-step-forward/</ref>

==References==
{{reflist}}

=[[Interstate 105 (Oregon)]]=

*[http://www.mad-cow.org/00/nowhere.html West Eugene Parkway notes] (2000)
*[https://www.peaktraffic.org/lane.html Other Eugene plans]

=[[Interstate 184]]=

*[https://www.flickr.com/photos/zacharymaillard/3077592737/in/album-72157607101372379/ 1969 map]: Part of SH-55, opened from I-84 to US 20/26?
*[https://books.google.com/books?id=BJk1AQAAMAAJ 1981 bridge EIS]
*[https://books.google.com/books?id=I5k1AQAAMAAJ&pg=PA92&lpg=PA92&dq=Broadway+Chinden+Connector&source=bl&ots=rs9OjOtCxu&sig=4asEBFFRzkVZ9yp3D0i_dO8up9M&hl=en&sa=X&ved=0ahUKEwjqsY2yj7LcAhXGITQIHQ39C2MQ6AEIRTAE#v=snippet&q=I-184&f=false 1983 bridge EIS]
*[http://forum.skyscraperpage.com/showthread.php?t=131760 Bridge opening clippings]

=[[Interstate 90 in Idaho]]=

;Earlier roads

The Coeur d'Alene River valley would be used by several railroads built in the late 1880s and early 1890s, including the [[Northern Pacific Railway]] across [[Lookout Pass]] in 1891. The region, later named the Silver Valley for its mineral deposits, experienced a population boom that overwhelmed the original wagon road.

*1912: [[Yellowstone Trail]], promoted by automobile groups, was plotted across the Silver Valley<ref>https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~214737~5501798:Auto-Trails-Map-Idaho-Montana-Wyomi?sort=pub_list_no_initialsort%2Cpub_date%2Cpub_list_no%2Cseries_no</ref>
*September 29, 1913: North, East and West Highway designated as part of initial state highway system
*March 9, 1914: Re-designated as North Pacific Highway<ref>https://books.google.com/books?id=zAxJAQAAMAAJ&pg=PA51&dq=%22North+Pacific+Highway%22+Idaho&hl=en&sa=X&ved=0ahUKEwiRqY_J9evdAhVqyVQKHaDWDmIQ6AEIODAD#v=onepage&q=%22North%20Pacific%20Highway%22&f=false</ref>
*March 14, 1923: Re-designated as Coeur d'Alene-Yellowstone Trail<ref>http://cdm16876.contentdm.oclc.org/cdm/compoundobject/collection/p16876coll13/id/2834/show/2581/rec/1</ref>{{rp|7}}
*1926: US 10 created
*1924 map: Signed as Highway 23 (North Pacific Highway)<ref>https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~201784~3000707</ref>
*Later signed as part of State Highway 4, which now is a short connector to Burke

;Interstate
*1953: Coeur d'Alene truck bypass proposed<ref>https://www.newspapers.com/clip/120277124/truck-by-pass-plans-talked/</ref><ref>https://www.newspapers.com/clip/120277108/lake-city-truck-bypass-talked/</ref><ref>October 21, 1953 ITD board minutes, p. 81</ref>
*1957: I-90 plans<ref>https://www.newspapers.com/clip/24249693/numbering_system_approved_for/</ref>
*1959: Fourth of July Pass section ($3.5 million, 7 miles) to replace old tunnel
*October 22, 1960: Coeur d'Alene section opened, including Cedar Canyon ($3.175 million, 4.42 miles)<ref>https://www.newspapers.com/clip/89848901/freeway-opened-at-coeur-dalene/</ref>
*1961: Idaho announces $16 million upgrade program for US 10 from Fourth of July Canyon to Mullan<ref>https://www.newspapers.com/clip/24249459/idaho_plans_16_million_work_on_us/</ref>
*December 18, 1969: Kellogg to Osburn opens (7.3 mi)<ref>{{cite news |date=December 19, 1969 |title=Seven New Miles of Freeway Open |page=6 |work=The Spokesman-Review |url=https://www.newspapers.com/clip/39946588/seven_new_miles_of_freeway_open/ |via=Newspapers.com |accessdate=}}</ref>
*October 22, 1970: Post Falls to Coeur d'Alene opened (5.6 miles)<ref>{{cite news |last=Davis |first=Jan |date=October 23, 1970 |title=Interstate 90: Link Dedicated |page=B3 |work=Spokane Daily Chronicle |url=https://www.newspapers.com/clip/99451856/interstate-90-link-dedicated/ |via=Newspapers.com |accessdate=}}</ref>
*1975: US 10 decommissioned from Spokane to US 95 Alt (now SH-97)<ref>{{AASHTO minutes |year=1975S |page=1 |accessdate=}}</ref>
*July 28, 1977: Post Falls section opens to traffic, connecting with Washington work via new bridges<ref>{{cite news |date=July 26, 1977 |title=I-90 Span Dedication Due Friday |page=5 |work=Spokane Daily Chronicle |url=https://news.google.com/newspapers?id=ylZOAAAAIBAJ&sjid=-vgDAAAAIBAJ&pg=5591%2C2186906 |via=Google News Archive |accessdate=}}</ref><ref>{{cite news |last=Floyd |first=Doug |date=July 29, 1977 |title=States Linked Today by Freeway |page=5 |work=Spokane Daily Chronicle |url=https://news.google.com/newspapers?id=zVZOAAAAIBAJ&sjid=-vgDAAAAIBAJ&pg=5496%2C3145890 |via=Google News Archive |accessdate=}}</ref><ref>https://www.newspapers.com/clip/99451762/post-falls-i-90-bypass-dedicated/</ref><ref>https://www.newspapers.com/clip/99451652/july-20-post-falls-red-letter/</ref>
**Began construction in 1973, cost $12.5 million (built by Idaho as part of 5.5-mile Post Falls bypass)
**Only two sections left: Wallace and Lake Couer d'Alene
*1977: US 10 decommissioned from US 95 Alt (now SH-97) to Montana state line<ref>{{AASHTO minutes |year=1977S |page=6 |accessdate=}}</ref>
*September 1991: Wallace traffic light retired; viaduct opens
**Historic Northern Pacific depot in Wallace moved to make way for freeway, rest of downtown spared
*1992: Lake Coeur d'Alene section finished

;New projects
*2022: [https://itdprojects.org/projects/i90corridorstudy/ Corridor Study] from WA to Sherman Avenue
**Widenings and interchange rebuilds proposed, to cost $1.2 billion<ref>https://www.khq.com/news/idaho-transportation-department-proposes-major-i-90-construction-project-due-to-influx-of-people/article_18e0e63a-5a74-11ed-a968-a35f9de40941.html</ref>

==References==
{{reflist}}

=[[Interstate H-201]]=

*[https://books.google.com/books?id=QpE1AQAAMAAJ&pg=PT47&lpg=PT47&dq=%22King+Street%22+%22Moanalua+Road%22&source=bl&ots=M58dA9DW07&sig=ACfU3U1EdENBsJVMWcaOJELik-hEvHhNOw&hl=en&sa=X&ved=2ahUKEwjJzLCTv630AhWiHTQIHRniBMUQ6AF6BAgYEAM#v=onepage&q=%22Moanalua%20Road%22&f=false 1987 EIS with history]

;Timeline

*September 1965: Moanalua Road exits close for upgrade<ref>https://www.newspapers.com/image/271498510/?terms=%22Moanalua%20Road%22&match=1</ref>
**September 2: Construction began on freeway upgrades from Houghtailing to Vineyard
*1969: $20 million for Moanalua upgrade proposed, with half federal split<ref>https://www.newspapers.com/image/271274000/?terms=Moanalua&match=1</ref>
*1972: $37 million freeway<ref>https://www.newspapers.com/clip/89135682/37-million-moanalua-freeway-to-uncork/</ref>
*1973: $44 million<ref>https://www.newspapers.com/clip/89187306/everythings-booming-on-h-2-improvements/</ref>
*1974: 3.5 miles of never-ending construction; 30,000 daily drivers<ref>https://www.newspapers.com/image/261414906/</ref><ref>https://www.newspapers.com/image/261414921/?terms=%22Moanalua%20Freeway%22&match=1</ref>

==References==
{{reflist}}

=[[Interstate 395 (Maine)]]=

*[https://www.fhwa.dot.gov/pavement/concrete/asr/petrographic/maine.pdf Bridge study] (FHWA, 2009)

===ME 9 extension===
*[https://www.interstate-guide.com/i-395-me/ I-Guide], [http://www.kurumi.com/roads/3di/i395.html#fn Kurumi], [https://www.floodgap.com/roadgap/me/r?395 Floodgap], [https://web.archive.org/web/20100923113359/http://www.state.me.us/mdot/interstate/index.php archived 2006 page]
*[https://web.archive.org/web/20210121121032/https://bangordailynews.com/2014/12/30/news/maine-east-west-highway-timeline/ Bangor Daily News timeline] (2014)
*Part of [[East–West Highway (New England)|East–West Highway]] corridor
**[https://digitalmaine.com/cgi/viewcontent.cgi?article=1011&context=mdot_docs 1999 corridor study] (p. 25)
*[https://www.maine.gov/mdot/projects/I395rt9connector/ Project website]
**ROD 2016: Preferred alternative is a super-two expressway<ref>https://www.maine.gov/mdot/projects/I395rt9connector/docs/record_of_decision.pdf</ref>

;Timeline
*1939 and 1944 pre-Interstate plans show Houlton or Calais?<ref>[https://www.aaroads.com/forum/index.php?topic=513.msg2436760#msg2436760 AARoads]</ref>
*NAFTA<ref>https://web.archive.org/web/20160924011058/http://bangordailynews.com/2015/02/03/news/bangor/legislative-hearing-over-i-395-connector-reignites-15-year-controversy/</ref>

==References==
{{reflist}}