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|length_mi=1433.52
|length_mi=1433.52
|length_round=2
|length_round=2
|length_ref=<ref name="USDOT">{{cite web |url = http://www.fhwa.dot.gov/reports/routefinder/table1.htm |title = Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002 |date = October 31, 2002 |publisher = [[Federal Highway Administration]] |access-date = July 20, 2011 }}</ref>
|length_ref=<ref name="USDOT">{{cite web |url = https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/?redirect |title = Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002 |date = October 31, 2002 |publisher = [[Federal Highway Administration]] |access-date = July 20, 2011 |archive-date = May 27, 2012 |archive-url = https://archive.today/20120527023005/http://www.fhwa.dot.gov/reports/routefinder/table1.htm |url-status = live }}</ref>
|established=1957
|established=1957
|direction_a=South
|direction_a=South
|terminus_a={{jct|country=USA|state=CA|I|5}} / 32nd Street / Norman Scott Road in [[San Diego, California|San Diego, CA]]
|terminus_a={{jct|country=USA|state=CA|I|8|SR|15}} in [[San Diego|San Diego, CA]]
|junction=<!-- Major Interstate junctions only; Only 10 most major intersections and cities belong here; please read [[WP:USRD/STDS]] for more info -->{{plainlist|
|junction=<!-- Major Interstate junctions only; Only 5-8 most major intersections and cities belong here; please read [[WP:USRD/STDS]] for more info -->
{{jct|country=USA|state=CA|I|8}} in [[San Diego|San Diego, CA]]
*{{jct|country=USA|I|10}} in [[Ontario, California|Ontario, CA]]
*{{jct|country=USA|I|10}} in [[Ontario, California|Ontario, CA]]
*{{jct|country=USA|I|40}} in [[Barstow, California|Barstow, CA]]
*{{jct|country=USA|I|40}} in [[Barstow, California|Barstow, CA]]
*{{jct|country=USA|I|515|US|93|US|95}} in [[Las Vegas, Nevada|Las Vegas, NV]]
*{{jct|country=USA|I|11|US|93|US|95}} in [[Las Vegas, Nevada|Las Vegas, NV]]
*{{jct|country=USA|I|70}} near [[Cove Fort, Utah|Cove Fort, UT]]
*{{jct|country=USA|I|70}} near [[Cove Fort, Utah|Cove Fort, UT]]
*{{jct|country=USA|I|80}} in [[Salt Lake City|Salt Lake City, UT]]
*{{jct|country=USA|I|80}} in [[Salt Lake City|Salt Lake City, UT]]
*{{jct|country=USA|I|84|dab1=Oregon-Utah}} from [[Riverdale, Utah|Riverdale]] to [[Tremonton, Utah|Tremonton, UT]]
*{{jct|country=USA|I|84|dab1=Oregon-Utah}} from [[Riverdale, Utah|Riverdale]] to [[Tremonton, Utah|Tremonton, UT]]
*{{jct|country=USA|I|86|dab1=Idaho}} in [[Chubbuck, Idaho|Chubbuck, ID]]
*{{jct|country=USA|I|86|dab1=Idaho}} in [[Chubbuck, Idaho|Chubbuck, ID]]
*{{jct|country=USA|I|90}} near [[Butte, Montana|Butte, MT]]}}
*{{jct|country=USA|I|90}} near [[Butte, Montana|Butte, MT]]
|direction_b=North
|direction_b=North
|terminus_b={{Jct|province=AB|Hwy|4}} at [[Sweetgrass–Coutts Border Crossing]] at [[Sweet Grass, Montana|Sweet Grass, MT]]
|terminus_b={{Jct|province=AB|Hwy|4}} at [[Sweetgrass–Coutts Border Crossing]] at [[Sweet Grass, Montana|Sweet Grass, MT]]
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}}
}}


'''Interstate&nbsp;15''' ('''I-15''') is a major [[Interstate Highway System|Interstate Highway]] in the western [[United States]], running through [[Southern California]] and the [[Intermountain West]]. I-15 begins near the [[Mexico–United States border|Mexican border]] in [[San Diego County, California|San Diego County]] and stretches north to [[Alberta|Alberta, Canada]], passing through the states of [[California]], [[Nevada]], [[Arizona]], [[Utah]], [[Idaho]], and [[Montana]]. The Interstate serves the cities of [[San Diego]], [[San Bernardino, California|San Bernardino]], [[Las Vegas]], [[St. George, Utah|St. George]], [[Provo, Utah|Provo]], [[Salt Lake City]], [[Ogden, Utah|Ogden]], [[Pocatello]], [[Idaho Falls, Idaho|Idaho Falls]], [[Butte, Montana|Butte]], [[Helena, Montana|Helena]], and [[Great Falls, Montana|Great Falls]]. It also passes close to the urban areas of [[Los Angeles County, California|Los Angeles]], [[Orange County, California|Orange]], and [[Riverside County, California|Riverside]] counties, California. The stretches of I-15 in Idaho, Utah, and Arizona have been designated as the "Veterans Memorial Highway".<ref name="AARoads">{{cite web |url = http://www.aaroads.com/west/i-015a_ut.html |work = Utah @ Rocky Mountain Roads |title = Interstate 15 |access-date = January 2, 2008 |publisher = AAroads }}{{sps|certain=yes|date=December 2020}}</ref> The southern end is at a junction with [[Interstate 8|I-8]] and [[California State Route 15|State Route&nbsp;15]] (SR&nbsp;15) in [[San Diego]], and the northern end is at a connection with [[Alberta Highway 4]] at the [[Sweetgrass–Coutts Border Crossing]].
'''Interstate&nbsp;15''' ('''I-15''') is a major [[Interstate Highway System|Interstate Highway]] in the [[Western United States]], running through [[Southern California]] and the [[Intermountain West]]. I-15 begins near the [[Mexico–United States border|Mexican border]] in [[San Diego County, California|San Diego County]] and stretches north to [[Alberta|Alberta, Canada]], passing through the states of [[California]], [[Nevada]], [[Arizona]], [[Utah]], [[Idaho]], and [[Montana]]. The Interstate serves the cities of [[San Diego]], [[San Bernardino, California|San Bernardino]], [[Las Vegas]], [[Salt Lake City]], [[Idaho Falls, Idaho|Idaho Falls]], and [[Great Falls, Montana|Great Falls]]. It also passes close to the urban areas of [[Los Angeles County, California|Los Angeles]], [[Orange County, California|Orange]], and [[Riverside County, California|Riverside]] counties, California. The stretches of I-15 in Idaho,{{cn|date=October 2024}} Utah, and Arizona have been designated as the "Veterans Memorial Highway".<ref>{{cite web | last=Trishman | first=Robert | title=I-15 rededicated as Veterans Memorial Highway | website=Deseret News | date=February 10, 2012 | url=https://www.deseret.com/2012/2/10/20392593/i-15-rededicated-as-veterans-memorial-highway/ | access-date=October 26, 2024}}</ref><ref>{{cite web | title=Arizona highways honor veterans all year long | website=Department of Transportation | date=November 10, 2016 | url=https://azdot.gov/blog-article/arizona-highways-honor-veterans-all-year-long | access-date=October 26, 2024}}</ref> The southern end is at a junction with [[Interstate 8|I-8]] and [[Interstate 15 in California|State Route&nbsp;15]] (SR&nbsp;15) in San Diego, and the northern end is at a connection with [[Alberta Highway 4]] at the [[Sweetgrass–Coutts Border Crossing]].


I-15 was built to connect the [[Inland Empire]] with San Diego in California, facilitate tourism access to Las Vegas, provide access to the [[Arizona Strip]], interconnect all of the [[metropolitan statistical area]]s in Utah except for [[Logan, Utah|Logan]], and provide freeway bypasses for [[Pocatello, Idaho|Pocatello]], [[Idaho Falls, Idaho|Idaho Falls]], and [[Great Falls, Montana|Great Falls]]. Since its creation, I-15 has served as a long-haul route for [[North America]]n commerce. It is now officially chartered for this purpose: from the junction of [[Interstate 515|I-515]] in [[Las Vegas]] to the [[Canada–United States border|Canadian border]], I-15 forms part of the [[CANAMEX Corridor]], a [[High Priority Corridor]], as a result of the [[North American Free Trade Agreement]].<ref name=canamex>{{cite web |url = http://www.canamex.org/ |title = CANAMEX CORRIDOR, The safe, smart and secure corridor |access-date = January 2, 2008 |publisher = Canamex Corridor Project |archive-url = https://web.archive.org/web/20080101020328/http://www.canamex.org/ |archive-date = January 1, 2008 |url-status = dead }}</ref> Since the construction of I-15, California, Idaho, Nevada, and Utah have consistently ranked in the fastest-growing areas of the United States. As a result, the route of I-15 has substantially increased in population and commuter traffic.
I-15 was built to connect the [[Inland Empire]] with San Diego in California, facilitate tourism access to Las Vegas, provide access to the [[Arizona Strip]], interconnect all of the [[metropolitan statistical area]]s in Utah except for [[Logan, Utah|Logan]], and provide freeway bypasses for [[Pocatello, Idaho|Pocatello]], Idaho Falls, and Great Falls. Since its creation, I-15 has served as a long-haul route for [[North America]]n commerce. It is now officially chartered for this purpose: from the junction of [[Interstate 515|I-515]] in [[Las Vegas]] to the [[Canada–United States border|Canadian border]], I-15 forms part of the [[CANAMEX Corridor]], a [[Intermodal Surface Transportation Efficiency Act|High Priority Corridor]], as a result of the [[North American Free Trade Agreement]].<ref name=canamex>{{cite web |url = http://www.canamex.org/ |title = CANAMEX CORRIDOR, The safe, smart and secure corridor |access-date = January 2, 2008 |publisher = Canamex Corridor Project |archive-url = https://web.archive.org/web/20080101020328/http://www.canamex.org/ |archive-date = January 1, 2008 |url-status = dead }}</ref> Since the construction of I-15, California, Idaho, Nevada, and Utah have consistently ranked in the fastest-growing areas of the United States. As a result, the route of I-15 has substantially increased in population and commuter traffic.


==Route description==
==Route description==
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}}
}}


This highway's southern terminus is in [[San Diego|San Diego, California]], at [[Interstate 8|I-8]], although via [[California State Route 15|SR&nbsp;15]], a southern extension of the freeway, the route connects to [[Interstate 5|I-5]] just north of the Mexico–US border.<ref name=sr15reconstruction>{{cite web |publisher = [[California Department of Transportation]] |date = December 2010 |title = State Route 15: Mid-City Bus Rapid Transit Project |page = 1 }}</ref> The northern terminus is in [[Sweet Grass, Montana]], at the Canada–US border, where it becomes [[Alberta Highway 4]]. It is {{convert|1433|mi|km|0}} long from San Diego to Sweet Grass.
This highway's southern terminus is in [[San Diego|San Diego, California]], at [[Interstate 8|I-8]], although via [[California State Route 15|SR&nbsp;15]], a southern extension of the freeway, the route connects to [[Interstate 5|I-5]] just north of the Mexico–US border.<ref name=sr15reconstruction>{{cite book |publisher = [[California Department of Transportation]] |date = December 2010 |title = State Route 15: Mid-City Bus Rapid Transit Project |page = 1 }}</ref> The northern terminus is in [[Sweet Grass, Montana]], at the Canada–US border, where it becomes [[Alberta Highway 4]]. It is {{convert|1433|mi|km|0}} long from San Diego to Sweet Grass.


===California===
===California===
{{Main|Interstate 15 in California}}
{{Main|Interstate 15 in California}}


I-15 begins at a tiny ramp off 32nd Street at Norman Scott Road in San Diego, though most of the traffic comes from the next entrance/exit, at I-5. Then, I-15 heads north through California. North of its junction with [[California State Route 91|SR&nbsp;91]] in [[Corona, California|Corona]], the route roughly follows the former routes of State Route 31. North of [[Devore, California|Devore]], the highway follows the approximate alignment of historic [[U.S. Route 66|US Route&nbsp;66]] along with [[U.S. Route 91|US&nbsp;91]] and [[U.S. Route 395|US&nbsp;395]]. US&nbsp;395 breaks away at Hesperia and the route continues on a direct path to [[Barstow, California|Barstow]] {{convert|35|mi|km|0}} to the north. Meanwhile, the old alignments of US&nbsp;91 and US&nbsp;66 follow the [[Mojave River]] from [[Victorville, California|Victorville]] to Barstow along the [[National Old Trails Road|National Trails Highway]]. At that point, I-15 follows the old route of US&nbsp;91 exclusively as US&nbsp;66 turned east toward [[Needles, California|Needles]]. For many parts of the highway, high-voltage [[electric power transmission|powerline]]s, such as [[Path 46]] and [[Path 27]], almost all originating from the [[Hoover Dam]], follow the freeway. Many of these link distant power stations to the [[Los Angeles]] metropolitan area.
North of its junction with [[California State Route 91|SR&nbsp;91]] in [[Corona, California|Corona]], the route roughly follows the former routes of State Route 31. North of [[Devore, California|Devore]], the highway follows the approximate alignment of historic [[U.S. Route 66|US Route&nbsp;66]] along with [[U.S. Route 91|US&nbsp;91]] and [[U.S. Route 395|US&nbsp;395]]. US&nbsp;395 breaks away at Hesperia and the route continues on a direct path to [[Barstow, California|Barstow]] {{convert|35|mi|km|0}} to the north. Meanwhile, the old alignments of US&nbsp;91 and US&nbsp;66 follow the [[Mojave River]] from [[Victorville, California|Victorville]] to Barstow along the [[National Old Trails Road|National Trails Highway]]. At that point, I-15 follows the old route of US&nbsp;91 exclusively as US&nbsp;66 turned east toward [[Needles, California|Needles]]. For many parts of the highway, high-voltage [[electric power transmission|powerline]]s, such as [[Path 46]] and [[Path 27]], almost all originating from the [[Hoover Dam]], follow the freeway. Many of these link distant power stations to the [[Los Angeles]] metropolitan area.


The southern starting point of I-15 was in 1957 planned to be in [[San Bernardino, California|San Bernardino]], at the interchange with the San Bernardino Freeway (then US&nbsp;70/US&nbsp;99, now [[Interstate 10|I-10]]). This was logical as I-15 was following the old alignment of the historic Route&nbsp;66 which passed through San Bernardino. The segment was completed accordingly.
The southern starting point of I-15 was in 1957 planned to be in [[San Bernardino, California|San Bernardino]], at the interchange with the San Bernardino Freeway (then US&nbsp;70/US&nbsp;99, now [[Interstate 10|I-10]]). This was logical as I-15 was following the old alignment of the historic Route&nbsp;66 which passed through San Bernardino. The segment was completed accordingly.
Line 92: Line 91:
{{Main|Interstate 15 in Nevada}}
{{Main|Interstate 15 in Nevada}}


For much of its route in Nevada and Arizona, plus the northeastern portion of I-15 in California, I-15 goes in a northeasterly direction. I-15 begins in [[Primm, Nevada|Primm]] and continues through [[Las Vegas]] along the [[Las Vegas Strip]] corridor. Then, the Interstate crosses the border with [[Arizona]] in [[Mesquite, Nevada|Mesquite]]. The Interstate in [[Nevada]] runs entirely in [[Clark County, Nevada|Clark County]], for a distance of {{convert|123.8|mi|km|0}}.
I-15 begins in [[Primm, Nevada|Primm]] and continues through [[Las Vegas]] along the [[Las Vegas Strip]] corridor. Then, the Interstate crosses the border with [[Arizona]] in [[Mesquite, Nevada|Mesquite]]. The Interstate in [[Nevada]] runs entirely in [[Clark County, Nevada|Clark County]], for a distance of {{convert|123.8|mi|km|0}}.


===Arizona===
===Arizona===
Line 116: Line 115:
I-15 was constructed along the route of [[U.S. Route 91|US&nbsp;91]]. Once I-15 was relatively intact, US&nbsp;91 was decommissioned, except for one part in Northern Utah&nbsp;/ Southern Idaho where I-15 instead followed the route of former [[U.S. Route 191|US&nbsp;191]].
I-15 was constructed along the route of [[U.S. Route 91|US&nbsp;91]]. Once I-15 was relatively intact, US&nbsp;91 was decommissioned, except for one part in Northern Utah&nbsp;/ Southern Idaho where I-15 instead followed the route of former [[U.S. Route 191|US&nbsp;191]].


I-15 originally had two suffixed routes. In California, I-15 had an eastern branch bypassing [[San Bernardino, California|San Bernardino]], which was designated I-15E. I-15E was renumbered and is now [[Interstate 215 (California)|I-215]]. Present day routing of I-15 in California was originally given "I-15W" as its title while it was under construction (the original asphalt portions from Temescal Canyon to Ontario Avenue were dubbed I-15W on maps until 1974), but was never officially signed as such.<ref>{{cite web |url = http://www.interstate-guide.com/i-215_ca.html |title = entry for Interstate 215 California |publisher = Interstate-guide.com |access-date = November 27, 2011 }}</ref> In Idaho, I-15 had a western branch near [[Pocatello, Idaho|Pocatello]] that connected I-15 and I-84 (then I-80N). This highway was designated I-15W. It is now the [[Interstate 86 (west)|western I-86]].<ref>{{cite web |url = http://www.interstate-guide.com/i-086_west.html |title = entry for I-86 Western |publisher = Interstate-guide.com |access-date = November 27, 2011 |archive-url = https://web.archive.org/web/20121019125648/http://www.interstate-guide.com/i-086_west.html |archive-date = October 19, 2012 |url-status = dead }}</ref>
I-15 originally had two suffixed routes. In California, I-15 had an eastern branch bypassing [[San Bernardino, California|San Bernardino]], which was designated I-15E. I-15E was renumbered and is now [[Interstate 215 (California)|I-215]]. Present day routing of I-15 in California was originally given "I-15W" as its title while it was under construction (the original asphalt portions from Temescal Canyon to Ontario Avenue were dubbed I-15W on maps until 1974), but was never officially signed as such.<ref>{{cite web |url = http://www.interstate-guide.com/i-215_ca.html |archive-url = https://web.archive.org/web/20031011192726/http://www.interstate-guide.com/i-215_ca.html |url-status = dead |archive-date = October 11, 2003 |title = entry for Interstate 215 California |publisher = Interstate-guide.com |access-date = November 27, 2011 }}</ref> In Idaho, I-15 had a western branch near [[Pocatello, Idaho|Pocatello]] that connected I-15 and I-84 (then I-80N). This highway was designated I-15W. It is now the [[Interstate 86 (west)|western I-86]].<ref>{{cite web |url = http://www.interstate-guide.com/i-086_west.html |title = entry for I-86 Western |publisher = Interstate-guide.com |access-date = November 27, 2011 |archive-url = https://web.archive.org/web/20121019125648/http://www.interstate-guide.com/i-086_west.html |archive-date = October 19, 2012 |url-status = dead }}</ref>


===Growth along route===
===Growth along route===
Since the construction of I-15, California, Nevada, and Utah have consistently ranked in the fastest-growing areas of the United States. As a result, the route of I-15 has substantially increased in population and commuter traffic has increased the traffic burden on the freeway. Current population estimates are that more than 75&nbsp;percent of the population of Utah,<ref name=UTI>{{cite web |url = http://www.utah.com/visitor/state_facts/population.htm |title = Population-Visitor Center- Utah.com |access-date = January 2, 2008 |publisher = Utah Travel Industry |url-status = dead |archive-url = https://web.archive.org/web/20080117034523/http://www.utah.com/visitor/state_facts/population.htm |archive-date = January 17, 2008 |df = mdy-all }}</ref> 19&nbsp;percent of the population of California, and more than 70&nbsp;percent of the population of Nevada live in counties where I-15 is the primary [[Interstate Highway System|Interstate Highway]].
Since the construction of I-15, California, Nevada, and Utah have consistently ranked in the fastest-growing areas of the United States. As a result, the route of I-15 has substantially increased in population and commuter traffic has increased the traffic burden on the freeway. Current population estimates are that more than 75&nbsp;percent of the population of Utah,<ref name=UTI>{{cite web |url = http://www.utah.com/visitor/state_facts/population.htm |title = Population-Visitor Center- Utah.com |access-date = January 2, 2008 |publisher = Utah Travel Industry |url-status = dead |archive-url = https://web.archive.org/web/20080117034523/http://www.utah.com/visitor/state_facts/population.htm |archive-date = January 17, 2008 |df = mdy-all }}</ref> 19&nbsp;percent of the population of California, and more than 70&nbsp;percent of the population of Nevada live in counties where I-15 is the primary [[Interstate Highway System|Interstate Highway]].


Similarly, in California, I-15 is seeing more commuter traffic due to the growth of the [[Mojave Desert]] communities of [[Hesperia, California|Hesperia]], [[Victorville, California|Victorville]], and [[Barstow, California|Barstow]]. In Utah, I-15 has been near-constantly upgraded in the [[Wasatch Front]], and future plans released by the [[UDOT|Utah Department of Transportation (UDOT)]] indicate that this will continue in the north ''and'' the far south of the state as well, due to the extremely rapid growth of [[Washington County, Utah|Washington County]] and surrounding areas. In like manner, [[Las Vegas]] in Nevada has seen growth along I-15, and in all of the states that it currently serves, it has recently been or is currently in the process of being upgraded to increase capacity and efficiency.<ref name=udot>{{cite web |url = http://www.udot.utah.gov/main/f?p=100:pg:0:::1:T,V:69, |title = Utah Department of Transportation, Projects Under Construction |access-date = January 2, 2008 |publisher = Utah Department of Transportation }}</ref><ref>{{cite web |url = http://www.nevadadot.com/Projects_and_Programs/Road_Projects/District_1_Construction_Report.aspx |title = District 1 Construction Report |access-date = January 2, 2008 |publisher = Nevada Department of Transportation |archive-url = https://web.archive.org/web/20110527065208/http://www.nevadadot.com/Projects_and_Programs/Road_Projects/District_1_Construction_Report.aspx |archive-date = May 27, 2011 |url-status = dead }}</ref><ref>{{cite web |url = http://www.dot.ca.gov/dist8/projects/15/I-15%20Brstw%20-STLN.revsd%206-2004%20copy.pdf |title = Interstate 15 Major Improvements |publisher = California Department of Transportation |url-status = dead |archive-url = https://web.archive.org/web/20070615184246/http://www.dot.ca.gov/dist8/projects/15/I-15%20Brstw%20-STLN.revsd%206-2004%20copy.pdf |archive-date = June 15, 2007 }}</ref> The portions in Arizona, Idaho and Montana have retained their rural, long-haul character. Although Arizona has also grown substantially since the construction of I-15, this [[highway]] serves only the [[Arizona Strip|isolated corner]] of northwestern Arizona.
Similarly, in California, I-15 is seeing more commuter traffic due to the growth of the [[Mojave Desert]] communities of [[Hesperia, California|Hesperia]], [[Victorville, California|Victorville]], and [[Barstow, California|Barstow]]. In Utah, I-15 has been under near-constant construction in the [[Wasatch Front]], and future plans released by the [[UDOT|Utah Department of Transportation (UDOT)]] indicate that this will continue in the north ''and'' the far south of the state as well, due to the extremely rapid growth of [[Washington County, Utah|Washington County]] and surrounding areas. In like manner, [[Las Vegas]] in Nevada has seen growth along I-15, and in all of the states that it currently serves, it has recently been or is currently in the process of being widened.<ref name=udot>{{cite web |url = http://www.udot.utah.gov/main/f?p=100:pg:0:::1:T,V:69, |title = Utah Department of Transportation, Projects Under Construction |access-date = January 2, 2008 |publisher = Utah Department of Transportation |archive-date = May 21, 2012 |archive-url = https://web.archive.org/web/20120521232341/http://www.udot.utah.gov/main/f?p=100:pg:0:::1:T,V:69, |url-status = dead }}</ref><ref>{{cite web |url = http://www.nevadadot.com/Projects_and_Programs/Road_Projects/District_1_Construction_Report.aspx |title = District 1 Construction Report |access-date = January 2, 2008 |publisher = Nevada Department of Transportation |archive-url = https://web.archive.org/web/20110527065208/http://www.nevadadot.com/Projects_and_Programs/Road_Projects/District_1_Construction_Report.aspx |archive-date = May 27, 2011 |url-status = dead }}</ref><ref>{{cite web |url = http://www.dot.ca.gov/dist8/projects/15/I-15%20Brstw%20-STLN.revsd%206-2004%20copy.pdf |title = Interstate 15 Major Improvements |publisher = California Department of Transportation |url-status = dead |archive-url = https://web.archive.org/web/20070615184246/http://www.dot.ca.gov/dist8/projects/15/I-15%20Brstw%20-STLN.revsd%206-2004%20copy.pdf |archive-date = June 15, 2007 }}</ref> The portions in Arizona, Idaho and Montana have retained their rural, long-haul character. Although Arizona has also grown substantially since the construction of I-15, this [[highway]] serves only the [[Arizona Strip|isolated corner]] of northwestern Arizona.


Due to this rapid area growth, the I-15 corridor is the focus of several [[mass transit]] projects. The [[Las Vegas Monorail]], ''[[FrontRunner]]'' [[Commuter rail in North America|commuter rail]] system, and [[TRAX (light rail)|TRAX]] [[light rail]] in [[Salt Lake City]] are mass transit lines loosely parallel to I-15 that are now in operation. Between Los Angeles and Las Vegas has long been proposed as a [[Magnetic levitation train|maglev train]] route; in 2004 the [[California–Nevada Interstate Maglev]] project held public meetings on the plan.<ref>{{cite web |author = Staff |url = http://www.progressiverailroading.com/transitnews/article.asp?id=4809 |title = FRA to begin environmental study for California-to-Nevada Maglev project |access-date = April 21, 2007 }}</ref>
Due to this rapid area growth, the I-15 corridor is the focus of several [[mass transit]] projects. The [[Las Vegas Monorail]], ''[[FrontRunner]]'' [[Commuter rail in North America|commuter rail]] system, and [[TRAX (light rail)|TRAX]] [[light rail]] in [[Salt Lake City]] are mass transit lines loosely parallel to I-15 that are now in operation.{{cn|date=June 2024}}

The Los Angeles–Las Vegas corridor has long been proposed as a high-speed [[Magnetic levitation train|maglev train]] route to relieve highway congestion. Proposals from as early as the 1970s were succeeded by the [[California–Nevada Interstate Maglev]] project, which was studied from 2004 to 2010 but never realized.<ref name="KTNV-Trains">{{cite news |last=Lupiani |first=Joyce |date=April 1, 2021 |title=History of train service between Las Vegas and California |url=https://www.ktnv.com/vegastrainhistory |publisher=[[KTNV-TV|KTNV]] |accessdate=June 19, 2024 |archive-date=June 20, 2024 |archive-url=https://web.archive.org/web/20240620053959/https://www.ktnv.com/vegastrainhistory |url-status=live }}</ref><ref>{{cite news |last=Velotta |first=Richard N. |date=March 3, 2024 |title=Before the LV-to LA rail project, maglev was planned |url=https://www.reviewjournal.com/business/business-columns/inside-gaming/before-the-lv-to-la-rail-project-maglev-was-planned-3010776/ |work=Las Vegas Review-Journal |accessdate=June 19, 2024 |archive-date=June 20, 2024 |archive-url=https://web.archive.org/web/20240620053943/https://www.reviewjournal.com/business/business-columns/inside-gaming/before-the-lv-to-la-rail-project-maglev-was-planned-3010776/ |url-status=live }}</ref> [[Amtrak]] ran a conventional passenger rail service between the two cities, named the ''[[Desert Wind]]'', from 1979 to 1997.<ref name="KTNV-Trains"/> The [[Brightline West]] line, a conventional [[high-speed rail]] service under a private operator, broke ground in 2024 and is scheduled to commence in 2028 with service between [[Rancho Cucamonga, California|Rancho Cucamonga]] and Las Vegas.<ref>{{cite news |last=Encinas |first=Amaris |date=April 23, 2024 |title=Brightline West broke ground, now the high-speed train is on the clock for 2028 Olympics |url=https://www.usatoday.com/story/travel/news/2024/04/23/brightline-west-train-route-map/73428402007/ |work=USA Today |accessdate=June 19, 2024 |archive-date=June 20, 2024 |archive-url=https://web.archive.org/web/20240620053958/https://www.usatoday.com/story/travel/news/2024/04/23/brightline-west-train-route-map/73428402007/ |url-status=live }}</ref> It will use the median of I-15 for most of its {{convert|218|mi|km|adj=mid}} route and reach speeds of up to {{convert|186|mph|kph}}.<ref>{{cite news |date=January 23, 2024 |title=Feds OK $2.5 billion more for high-speed rail from SoCal to Las Vegas; could open by 2028 |url=https://www.desertsun.com/story/news/nation/california/2024/01/23/high-speed-rail-from-las-vegas-to-southern-california-may-open-by-2028/72326897007/ |work=Desert Sun |accessdate=June 19, 2024 |archive-date=June 20, 2024 |archive-url=https://web.archive.org/web/20240620053943/https://www.desertsun.com/story/news/nation/california/2024/01/23/high-speed-rail-from-las-vegas-to-southern-california-may-open-by-2028/72326897007/ |url-status=live }}</ref>


== Future ==
== Future ==
The segment signed as SR&nbsp;15 from [[Interstate 5 in California|I-5]] to [[Interstate 8 in California|I-8]] in [[San Diego]] is planned to be redesignated as part of I-15 once this segment is completely upgraded to [[Interstate Highway standards|Interstate standards]], namely where the freeway's [[Interchange (road)|interchange]] with SR&nbsp;94 is concerned. The interchange currently has left-exits and blind merges, and is due to be updated with a long-awaited widening of both SR&nbsp;15 and SR&nbsp;94. At that time, SR&nbsp;15 is planned be resigned as part of I-15. The remaining portion of SR&nbsp;15 conforms with Interstate standards.<ref name="cahighways.org">{{cite web|url=http://cahighways.org/009-016.html#015|title=Routes 9 through 16|last=Faigin|first=Daniel P.|work=California Highways|access-date=May 1, 2008}}{{self-published source|date=August 2014}}</ref>
The segment signed as SR&nbsp;15 from [[Interstate 5 in California|I-5]] to [[Interstate 8 in California|I-8]] in [[San Diego]] is planned to be redesignated as part of I-15 once this segment is completely converted to [[Interstate Highway standards|Interstate standards]], namely where the freeway's [[Interchange (road)|interchange]] with SR&nbsp;94 is concerned. The interchange currently has left-exits and blind merges, and is due to be updated with a widening of both SR&nbsp;15 and SR&nbsp;94. At that time, SR&nbsp;15 is planned be resigned as part of I-15. The remaining portion of SR&nbsp;15 conforms with Interstate standards.<ref name="cahighways.org">{{cite web|url=http://cahighways.org/009-016.html#015|title=Routes 9 through 16|last=Faigin|first=Daniel P.|work=California Highways|access-date=May 1, 2008|archive-date=July 9, 2016|archive-url=https://web.archive.org/web/20160709225634/http://www.cahighways.org/009-016.html#015|url-status=live}}{{self-published source|date=August 2014}}</ref>


==Junction list==
==Junction list==
⚫
'''Source:'''<ref name=randmcnally>{{cite book |year = 2014 |title = The Road Atlas |edition = Walmart |location = Chicago |publisher = Rand McNally |pages = 15, 31, 60, 64, 102|isbn = 978-0-528-00771-2}}</ref>
⚫
;California

⚫
; California
: 32nd Street and Norman Scott Road in [[Barrio Logan, San Diego|Barrio Logan]], [[San Diego]] (future interchange)
: 32nd Street and Norman Scott Road in [[Barrio Logan, San Diego|Barrio Logan]], [[San Diego]] (future interchange)
: {{jct|country=USA|I|5}} on the Barrio Logan–[[Southcrest, San Diego|Southcrest]]–[[Logan Heights, San Diego|Logan Heights]], San Diego neighborhood line (future interchange)
: {{jct|country=USA|I|5}} on the Barrio Logan–[[Southcrest, San Diego|Southcrest]]–[[Logan Heights, San Diego|Logan Heights]], San Diego neighborhood line (future interchange)
Line 139: Line 142:
: {{jct|country=USA|US|395}} in [[Hesperia, California|Hesperia]]
: {{jct|country=USA|US|395}} in [[Hesperia, California|Hesperia]]
: {{jct|country=USA|I|40}} in [[Barstow, California|Barstow]]
: {{jct|country=USA|I|40}} in [[Barstow, California|Barstow]]
;Nevada
; Nevada
: {{jct|country=USA|I|215|dab1=Nevada}} in [[Enterprise, Nevada|Enterprise]]
: {{jct|country=USA|I|215|dab1=Nevada}} in [[Enterprise, Nevada|Enterprise]]
: {{jct|country=USA|I|515|US|93|US|95}} in [[Las Vegas]]. I-15/US&nbsp;93 travels concurrently to northeast of [[North Las Vegas, Nevada|North Las Vegas]].
: {{jct|country=USA|I|11|US|93|US|95}} in [[Las Vegas]]. I-15/US&nbsp;93 travels concurrently to northeast of [[North Las Vegas, Nevada|North Las Vegas]].
;Arizona
; Arizona
: No major intersections
: No major intersections
;Utah
; Utah
: {{jct|country=USA|I|70}} south-southwest of [[Cove Fort]]
: {{jct|country=USA|I|70}} south-southwest of [[Cove Fort]]
: {{jct|country=USA|US|50}} north-northeast of [[Holden, Utah|Holden]]. The highways travel concurrently to [[Scipio, Utah|Scipio]].
: {{jct|country=USA|US|50}} north-northeast of [[Holden, Utah|Holden]]. The highways travel concurrently to [[Scipio, Utah|Scipio]].
Line 158: Line 161:
: {{jct|country=USA|I|84|dab1=Oregon–Utah}} in [[Riverdale, Utah|Riverdale]]. The highways travel concurrently to [[Tremonton, Utah|Tremonton]].
: {{jct|country=USA|I|84|dab1=Oregon–Utah}} in [[Riverdale, Utah|Riverdale]]. The highways travel concurrently to [[Tremonton, Utah|Tremonton]].
: {{jct|country=USA|US|91}} on the [[Perry, Utah|Perry]]–[[Brigham City, Utah|Brigham City]] city line.
: {{jct|country=USA|US|91}} on the [[Perry, Utah|Perry]]–[[Brigham City, Utah|Brigham City]] city line.
;Idaho
; Idaho
: {{jct|country=USA|US|91}} north-northwest of [[Virginia, Idaho|Virginia]]. The highways travel concurrently to [[Pocatello, Idaho|Pocatello]].
: {{jct|country=USA|US|91}} north-northwest of [[Virginia, Idaho|Virginia]]. The highways travel concurrently to [[Pocatello, Idaho|Pocatello]].
: {{jct|country=USA|US|30}} northwest of [[McCammon, Idaho|McCammon]]. The highways travel concurrently to Pocatello.
: {{jct|country=USA|US|30}} northwest of [[McCammon, Idaho|McCammon]]. The highways travel concurrently to Pocatello.
Line 165: Line 168:
: {{jct|country=USA|US|26}} in Blackfoot. The highways travel concurrently to [[Idaho Falls, Idaho|Idaho Falls]].
: {{jct|country=USA|US|26}} in Blackfoot. The highways travel concurrently to [[Idaho Falls, Idaho|Idaho Falls]].
: {{jct|country=USA|US|20}} in Idaho Falls. The highways travel concurrently through Idaho Falls.
: {{jct|country=USA|US|20}} in Idaho Falls. The highways travel concurrently through Idaho Falls.
;Montana
; Montana
: {{jct|country=USA|I|90}} in [[Butte, Montana|Butte]]. The highways travel concurrently through Butte.
: {{jct|country=USA|I|90}} in [[Butte, Montana|Butte]]. The highways travel concurrently through Butte.
: {{jct|country=USA|I|115}} in Butte
: {{jct|country=USA|I|115}} in Butte
Line 172: Line 175:
: {{jct|country=USA|US|2}} in [[Shelby, Montana|Shelby]]
: {{jct|country=USA|US|2}} in [[Shelby, Montana|Shelby]]
: {{jct|province=AB|Hwy|4}} at the [[Sweetgrass-Coutts Border Crossing]] in the [[Canada–United States border|Canadian border]] east-northeast of [[Sweet Grass, Montana|Sweet Grass]]
: {{jct|province=AB|Hwy|4}} at the [[Sweetgrass-Coutts Border Crossing]] in the [[Canada–United States border|Canadian border]] east-northeast of [[Sweet Grass, Montana|Sweet Grass]]
⚫
<ref name=randmcnally>{{cite book |author = Rand McNally |year = 2014 |title = The Road Atlas |edition = Walmart |location = Chicago |publisher = Rand McNally |pages = 15, 31, 60, 64, 102|isbn = 978-0-528-00771-2}}</ref>


==Auxiliary routes==
==Auxiliary routes==
*[[Inland Empire|Inland Empire, California]]&nbsp;– [[Interstate 215 (California)|I-215]]
*[[Inland Empire|Inland Empire, California]]&nbsp;– [[Interstate 215 (California)|I-215]]
*[[Henderson, Nevada]]&nbsp;– [[Interstate 515|I-515]]
*[[Las Vegas|Las Vegas, Nevada]]&nbsp;– [[Interstate 215 (Nevada)|I-215]], [[Interstate 515|I-515]] (former)
*[[Las Vegas|Las Vegas, Nevada]]&nbsp;– [[Interstate 215 (Nevada)|I-215]]
*[[Salt Lake City|Salt Lake City, Utah]]&nbsp;– [[Interstate 215 (Utah)|I-215]]
*[[Salt Lake City|Salt Lake City, Utah]]&nbsp;– [[Interstate 215 (Utah)|I-215]]
*[[Butte, Montana]]&nbsp;– [[Interstate 115|I-115]]
*[[Butte, Montana]]&nbsp;– [[Interstate 115|I-115]]
*[[Great Falls, Montana]]&nbsp;– [[Interstate 315|I-315]]
*[[Great Falls, Montana]]&nbsp;– [[Interstate 315|I-315]] (unsigned)


==See also==
==See also==

Latest revision as of 15:17, 26 October 2024

Interstate 15 marker
Interstate 15
Map
I-15 highlighted in red
Route information
Length1,433.52 mi[1] (2,307.03 km)
Existed1957–present
NHSEntire route
Major junctions
South end I-8 / SR 15 in San Diego, CA
Major intersections
North end Highway 4 at Sweetgrass–Coutts Border Crossing at Sweet Grass, MT
Location
CountryUnited States
StatesCalifornia, Nevada, Arizona, Utah, Idaho, Montana
Highway system

Interstate 15 (I-15) is a major Interstate Highway in the Western United States, running through Southern California and the Intermountain West. I-15 begins near the Mexican border in San Diego County and stretches north to Alberta, Canada, passing through the states of California, Nevada, Arizona, Utah, Idaho, and Montana. The Interstate serves the cities of San Diego, San Bernardino, Las Vegas, Salt Lake City, Idaho Falls, and Great Falls. It also passes close to the urban areas of Los Angeles, Orange, and Riverside counties, California. The stretches of I-15 in Idaho,[citation needed] Utah, and Arizona have been designated as the "Veterans Memorial Highway".[2][3] The southern end is at a junction with I-8 and State Route 15 (SR 15) in San Diego, and the northern end is at a connection with Alberta Highway 4 at the Sweetgrass–Coutts Border Crossing.

I-15 was built to connect the Inland Empire with San Diego in California, facilitate tourism access to Las Vegas, provide access to the Arizona Strip, interconnect all of the metropolitan statistical areas in Utah except for Logan, and provide freeway bypasses for Pocatello, Idaho Falls, and Great Falls. Since its creation, I-15 has served as a long-haul route for North American commerce. It is now officially chartered for this purpose: from the junction of I-515 in Las Vegas to the Canadian border, I-15 forms part of the CANAMEX Corridor, a High Priority Corridor, as a result of the North American Free Trade Agreement.[4] Since the construction of I-15, California, Idaho, Nevada, and Utah have consistently ranked in the fastest-growing areas of the United States. As a result, the route of I-15 has substantially increased in population and commuter traffic.

Route description

[edit]
Lengths
  mi[1] km
CA 287.26 462.30
NV 123.77 199.19
AZ 29.39 47.30
UT 401.07 645.46
ID 196.00 315.43
MT 396.03 637.35
Total 1,433.52 2,307.03
Northbound I-15 makes a steep descent from the Mountain Pass into the Ivanpah Valley
Aerial view of I-15 looking south from Sunset Road in the Las Vegas Valley
I-15 passes through the Virgin River Gorge, Arizona, revealing scenic reddish brown cliffs
I-15 in Arizona
I-15 in Salt Lake City
I-15/US 20 Jct. in Idaho Falls, Idaho
I-15, 20 miles (32 km) south of Dillon, Montana
I-15 (foreground left to right) goes through Great Falls, Montana

This highway's southern terminus is in San Diego, California, at I-8, although via SR 15, a southern extension of the freeway, the route connects to I-5 just north of the Mexico–US border.[5] The northern terminus is in Sweet Grass, Montana, at the Canada–US border, where it becomes Alberta Highway 4. It is 1,433 miles (2,306 km) long from San Diego to Sweet Grass.

California

[edit]
Main article: Interstate 15 in California

North of its junction with SR 91 in Corona, the route roughly follows the former routes of State Route 31. North of Devore, the highway follows the approximate alignment of historic US Route 66 along with US 91 and US 395. US 395 breaks away at Hesperia and the route continues on a direct path to Barstow 35 miles (56 km) to the north. Meanwhile, the old alignments of US 91 and US 66 follow the Mojave River from Victorville to Barstow along the National Trails Highway. At that point, I-15 follows the old route of US 91 exclusively as US 66 turned east toward Needles. For many parts of the highway, high-voltage powerlines, such as Path 46 and Path 27, almost all originating from the Hoover Dam, follow the freeway. Many of these link distant power stations to the Los Angeles metropolitan area.

The southern starting point of I-15 was in 1957 planned to be in San Bernardino, at the interchange with the San Bernardino Freeway (then US 70/US 99, now I-10). This was logical as I-15 was following the old alignment of the historic Route 66 which passed through San Bernardino. The segment was completed accordingly.

In 1964, legislation was later passed to extend the Interstate to San Diego. Instead of extending the existing freeway from the I-10 interchange south, however, the California Department of Transportation drew a new segment in Devore that "branched" off of the original alignment and bypassed San Bernardino altogether. This segment's alignment is generally northeast to southwest for about 13 miles (21 km). Then, in Rancho Cucamonga, its directional alignment shifts to north–south where it eventually meets with I-10 (about 15 miles (24 km) west of the original interchange in San Bernardino). The segment that had been built from Devore to San Bernardino was retained as an Interstate, but was renumbered as I-215. Note that during the construction of I-15's present alignment, and for some time afterward, I-215 was numbered as I-15E, and its actual mileage would begin at I-10. I-15 runs for a total of 287 miles (462 km) in California.

Nevada

[edit]
Main article: Interstate 15 in Nevada

I-15 begins in Primm and continues through Las Vegas along the Las Vegas Strip corridor. Then, the Interstate crosses the border with Arizona in Mesquite. The Interstate in Nevada runs entirely in Clark County, for a distance of 123.8 miles (199 km).

Arizona

[edit]
Main article: Interstate 15 in Arizona

I-15 passes through the northwestern corner of Arizona with a total length of 29.4 miles (47 km).[6] The stretch is separated from the rest of the state and has one major exit, at Beaver Dam/Littlefield, Arizona. It includes a spectacular section where the road twists between the narrow walls of the Virgin River Gorge.

Utah

[edit]
Main article: Interstate 15 in Utah

I-15 continues through Utah for 401 miles (645 km). It is the main north–south connection for the state. The highway approximately follows the old alignment of US 91 from St. George to Brigham City. The highway passes through the fast-growing Utah's Dixie region in the southwestern part of the state, which includes St. George, Cedar City, and eventually most of the major cities and suburbs along the Wasatch Front, including Provo, Orem, Sandy, Salt Lake City, Layton, and Ogden. Near Cove Fort, I-70 begins its journey eastward across the country. The Interstate merges with I-80 for about 3 miles (5 km) from South Salt Lake to just west of Downtown Salt Lake City and also merges with I-84 from Ogden to Tremonton. Along nearly its entire length through the state, I-15 winds its way along the western edge of a nearly continuous range of mountains (the Wasatch Range in the northern half of the state). The only exceptions are north of Cove Fort and when it passes between Cedar City and St. George, known as the Black Ridge, a transition zone of drastic change in elevation and climate, an area where the eastern Great Basin, Colorado Plateau, and Mojave Desert converge.

Idaho

[edit]
Main article: Interstate 15 in Idaho

I-15 passes through Idaho for 196 miles (315 km). I-15 crosses the Utah state line in Oneida County. The highway runs through Pocatello, Blackfoot, and Idaho Falls, intersecting with I-86. The last county in Idaho that I-15 passes through is Clark County. Finally, the Interstate reaches the Montana state line at Monida Pass.

Montana

[edit]
Main article: Interstate 15 in Montana

I-15 continues onward through 396 miles (637 km) of Montana through the cities of Butte, Helena, and Great Falls, intersecting with I-90, I-115, and I-315. At Sweet Grass, I-15 terminates upon crossing the Canadian border into the province of Alberta; however, I-15 signage is present on Alberta Highway 4 southbound from Lethbridge to the Canadian border.

History

[edit]

I-15 was constructed along the route of US 91. Once I-15 was relatively intact, US 91 was decommissioned, except for one part in Northern Utah / Southern Idaho where I-15 instead followed the route of former US 191.

I-15 originally had two suffixed routes. In California, I-15 had an eastern branch bypassing San Bernardino, which was designated I-15E. I-15E was renumbered and is now I-215. Present day routing of I-15 in California was originally given "I-15W" as its title while it was under construction (the original asphalt portions from Temescal Canyon to Ontario Avenue were dubbed I-15W on maps until 1974), but was never officially signed as such.[7] In Idaho, I-15 had a western branch near Pocatello that connected I-15 and I-84 (then I-80N). This highway was designated I-15W. It is now the western I-86.[8]

Growth along route

[edit]

Since the construction of I-15, California, Nevada, and Utah have consistently ranked in the fastest-growing areas of the United States. As a result, the route of I-15 has substantially increased in population and commuter traffic has increased the traffic burden on the freeway. Current population estimates are that more than 75 percent of the population of Utah,[9] 19 percent of the population of California, and more than 70 percent of the population of Nevada live in counties where I-15 is the primary Interstate Highway.

Similarly, in California, I-15 is seeing more commuter traffic due to the growth of the Mojave Desert communities of Hesperia, Victorville, and Barstow. In Utah, I-15 has been under near-constant construction in the Wasatch Front, and future plans released by the Utah Department of Transportation (UDOT) indicate that this will continue in the north and the far south of the state as well, due to the extremely rapid growth of Washington County and surrounding areas. In like manner, Las Vegas in Nevada has seen growth along I-15, and in all of the states that it currently serves, it has recently been or is currently in the process of being widened.[10][11][12] The portions in Arizona, Idaho and Montana have retained their rural, long-haul character. Although Arizona has also grown substantially since the construction of I-15, this highway serves only the isolated corner of northwestern Arizona.

Due to this rapid area growth, the I-15 corridor is the focus of several mass transit projects. The Las Vegas Monorail, FrontRunner commuter rail system, and TRAX light rail in Salt Lake City are mass transit lines loosely parallel to I-15 that are now in operation.[citation needed]

The Los Angeles–Las Vegas corridor has long been proposed as a high-speed maglev train route to relieve highway congestion. Proposals from as early as the 1970s were succeeded by the California–Nevada Interstate Maglev project, which was studied from 2004 to 2010 but never realized.[13][14] Amtrak ran a conventional passenger rail service between the two cities, named the Desert Wind, from 1979 to 1997.[13] The Brightline West line, a conventional high-speed rail service under a private operator, broke ground in 2024 and is scheduled to commence in 2028 with service between Rancho Cucamonga and Las Vegas.[15] It will use the median of I-15 for most of its 218-mile (351 km) route and reach speeds of up to 186 miles per hour (299 km/h).[16]

Future

[edit]

The segment signed as SR 15 from I-5 to I-8 in San Diego is planned to be redesignated as part of I-15 once this segment is completely converted to Interstate standards, namely where the freeway's interchange with SR 94 is concerned. The interchange currently has left-exits and blind merges, and is due to be updated with a widening of both SR 15 and SR 94. At that time, SR 15 is planned be resigned as part of I-15. The remaining portion of SR 15 conforms with Interstate standards.[17]

Junction list

[edit]

Source:[18]

California
32nd Street and Norman Scott Road in Barrio Logan, San Diego (future interchange)
I-5 on the Barrio Logan–Southcrest–Logan Heights, San Diego neighborhood line (future interchange)
I-805 on the North Park–City Heights, San Diego neighborhood line (future interchange)
I-8 on the Mission Valley East–Grantville, San Diego neighborhood line
I-215 in Murrieta
I-10 in Ontario
I-215 near San Bernardino
US 395 in Hesperia
I-40 in Barstow
Nevada
I-215 in Enterprise
I-11 / US 93 / US 95 in Las Vegas. I-15/US 93 travels concurrently to northeast of North Las Vegas.
Arizona
No major intersections
Utah
I-70 south-southwest of Cove Fort
US 50 north-northeast of Holden. The highways travel concurrently to Scipio.
US 6 in Santaquin. The highways travel concurrently to Spanish Fork.
US 189 in Provo
US 89 in Lehi. The highways travel concurrently to Draper.
I-215 in Murray
I-80 in South Salt Lake. The highways travel concurrently to Salt Lake City.
US 89 in Salt Lake City
US 89 in North Salt Lake
I-215 in North Salt Lake
US 89 on the West Bountiful–Bountiful city line. The highways travel concurrently to Farmington.
I-84 in Riverdale. The highways travel concurrently to Tremonton.
US 91 on the Perry–Brigham City city line.
Idaho
US 91 north-northwest of Virginia. The highways travel concurrently to Pocatello.
US 30 northwest of McCammon. The highways travel concurrently to Pocatello.
I-86 in Chubbuck
US 91 southwest of Blackfoot
US 26 in Blackfoot. The highways travel concurrently to Idaho Falls.
US 20 in Idaho Falls. The highways travel concurrently through Idaho Falls.
Montana
I-90 in Butte. The highways travel concurrently through Butte.
I-115 in Butte
US 12 / US 287 in Helena. I-15/US 287 travels concurrently to northeast of Wolf Creek.
I-315 / US 89 in Great Falls. I-15/US 89 travels concurrently to northeast of Vaughn.
US 2 in Shelby
Highway 4 at the Sweetgrass-Coutts Border Crossing in the Canadian border east-northeast of Sweet Grass

Auxiliary routes

[edit]

See also

[edit]

References

[edit]
  1. ^ a b "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of October 31, 2002". Federal Highway Administration. October 31, 2002. Archived from the original on May 27, 2012. Retrieved July 20, 2011.
  2. ^ Trishman, Robert (February 10, 2012). "I-15 rededicated as Veterans Memorial Highway". Deseret News. Retrieved October 26, 2024.
  3. ^ "Arizona highways honor veterans all year long". Department of Transportation. November 10, 2016. Retrieved October 26, 2024.
  4. ^ "CANAMEX CORRIDOR, The safe, smart and secure corridor". Canamex Corridor Project. Archived from the original on January 1, 2008. Retrieved January 2, 2008.
  5. ^ State Route 15: Mid-City Bus Rapid Transit Project. California Department of Transportation. December 2010. p. 1.
  6. ^ Arizona Department of Transportation Project 015 MO 000 H577901C, sheet 73 of 103 - revised May 2005
  7. ^ "entry for Interstate 215 California". Interstate-guide.com. Archived from the original on October 11, 2003. Retrieved November 27, 2011.
  8. ^ "entry for I-86 Western". Interstate-guide.com. Archived from the original on October 19, 2012. Retrieved November 27, 2011.
  9. ^ "Population-Visitor Center- Utah.com". Utah Travel Industry. Archived from the original on January 17, 2008. Retrieved January 2, 2008.
  10. ^ "Utah Department of Transportation, Projects Under Construction". Utah Department of Transportation. Archived from the original on May 21, 2012. Retrieved January 2, 2008.
  11. ^ "District 1 Construction Report". Nevada Department of Transportation. Archived from the original on May 27, 2011. Retrieved January 2, 2008.
  12. ^ "Interstate 15 Major Improvements" (PDF). California Department of Transportation. Archived from the original (PDF) on June 15, 2007.
  13. ^ a b Lupiani, Joyce (April 1, 2021). "History of train service between Las Vegas and California". KTNV. Archived from the original on June 20, 2024. Retrieved June 19, 2024.
  14. ^ Velotta, Richard N. (March 3, 2024). "Before the LV-to LA rail project, maglev was planned". Las Vegas Review-Journal. Archived from the original on June 20, 2024. Retrieved June 19, 2024.
  15. ^ Encinas, Amaris (April 23, 2024). "Brightline West broke ground, now the high-speed train is on the clock for 2028 Olympics". USA Today. Archived from the original on June 20, 2024. Retrieved June 19, 2024.
  16. ^ "Feds OK $2.5 billion more for high-speed rail from SoCal to Las Vegas; could open by 2028". Desert Sun. January 23, 2024. Archived from the original on June 20, 2024. Retrieved June 19, 2024.
  17. ^ Faigin, Daniel P. "Routes 9 through 16". California Highways. Archived from the original on July 9, 2016. Retrieved May 1, 2008.[self-published source]
  18. ^ The Road Atlas (Walmart ed.). Chicago: Rand McNally. 2014. pp. 15, 31, 60, 64, 102. ISBN 978-0-528-00771-2.
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