Manchac Swamp Bridge: Difference between revisions

Manchac Swamp Bridge
Manchac Swamp Bridge
Coordinates	30°18′11″N 90°24′21″W / 30.302946°N 90.405807°W
Carries	I-55 / US 51
Crosses	Manchac Swamp
Locale	St. John the Baptist Parish / Tangipahoa Parish, Louisiana, USA
Other name(s)	I-55 Manchac Swamp Crossing
Maintained by	LA DOTD
Characteristics
Total length	22.8 miles (36.7 km)
Width	312 feet (95 m)
History
Opened	1979
Location

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Revision as of 17:52, 21 March 2023

The Manchac Swamp Bridge is a twin concrete trestle bridge near Manchac in the US state of Louisiana.^[1] With a total length of 22.80 miles (36.69 km),^[2]^[3] it is one of the longest bridges in the world over water and is the longest bridge on the Interstate Highway System. Some claim it is the longest toll-free road bridge in the world.^[4] The bridge carries Interstate 55 and U.S. Route 51 over the Manchac Swamp in Louisiana and represents a third of the highway's approximately 66 miles (106 km) in Louisiana. Opening in 1979,^[1] its piles were driven 250 feet (76 m) beneath the swamp and with the cost of the span being $7 million per mile ($4.3 million/km) (equivalent to $23.7 million per mile ($15 million/km) in 2023^[5]) to complete.^[6]

References

^ ^a ^b ^c Melaragno, Michele G. (1998). Preliminary Design of Bridges for Architects and Engineers. CRC Press. p. 377. ISBN 978-0-8247-0184-0. Retrieved June 20, 2010.
^ "Manchac Swamp Bridge". Atlas Obscura. Retrieved May 2, 2019.
^ "Manchac Swamp Bridge, one of the longest bridges in the world over water". www.dangerousroads.org. Retrieved March 7, 2022.
^ "Longest Bridges in North America". WorldAtlas. August 1, 2017. Retrieved March 7, 2022.
^ Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved November 30, 2023. United States Gross Domestic Product deflator figures follow the MeasuringWorth series.
^ Loh, Jules (June 8, 1977). "Louisiana 'oasis' is cypress-paneled". The Tuscaloosa News. Tuscaloosa, Alabama. p. 6. Retrieved July 20, 2010.

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[Melaragno-1] Melaragno, Michele G. (1998). Preliminary Design of Bridges for Architects and Engineers. CRC Press. p. 377. ISBN 978-0-8247-0184-0. Retrieved June 20, 2010.

[2] "Manchac Swamp Bridge". Atlas Obscura. Retrieved May 2, 2019.

[3] "Manchac Swamp Bridge, one of the longest bridges in the world over water". www.dangerousroads.org. Retrieved March 7, 2022.

[4] "Longest Bridges in North America". WorldAtlas. August 1, 2017. Retrieved March 7, 2022.

[inflation-USGDP-5] Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved November 30, 2023. United States Gross Domestic Product deflator figures follow the MeasuringWorth series.

[June_8,_1977-6] Loh, Jules (June 8, 1977). "Louisiana 'oasis' is cypress-paneled". The Tuscaloosa News. Tuscaloosa, Alabama. p. 6. Retrieved July 20, 2010.

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-The '''Manchac Swamp Bridge''' is a twin [[Trestle bridge#Concrete trestles|concrete trestle]] [[bridge]] in the [[US state]] of [[Louisiana]].<ref name="Melaragno"/> With a total length of {{convert|22.80|mi|km}},<ref>{{Cite web |title=Manchac Swamp Bridge |url=http://www.atlasobscura.com/places/manchac-swamp-bridge-2 |access-date=May 2, 2019 |website=Atlas Obscura |language=en}}</ref><ref>{{Cite web |title=Manchac Swamp Bridge, one of the longest bridges in the world over water |url=https://www.dangerousroads.org/north-america/usa/6568-manchac-swamp-bridge.html |access-date=March 7, 2022 |website=www.dangerousroads.org |language=en-gb}}</ref> it is one of the [[List of bridges by length|longest bridges in the world over water]] and is the longest bridge on the [[Interstate Highway System]]. Some claim it is the longest toll-free road bridge in the world.<ref>{{Cite web |date=August 1, 2017 |title=Longest Bridges in North America |url=https://www.worldatlas.com/articles/longest-bridges-in-north-america.html |access-date=March 7, 2022 |website=WorldAtlas |language=en-US}}</ref> The bridge carries [[Interstate 55 in Louisiana|Interstate 55]] and [[U.S. Route 51 in Louisiana|U.S. Route 51]] over the Manchac Swamp in [[Louisiana]] and represents a third of the highway's approximately {{convert|66|mi|km}} in Louisiana. Opening in 1979,<ref name="Melaragno"/> its [[Deep foundation|piles]] were driven {{convert|250|ft|m}} beneath the swamp and with the cost of the span being $7&nbsp;million per mile ({{convert|7|e6$/mi|e6$/km|abbr=unit|disp=output number only}}/km) (equivalent to ${{formatprice|{{inflation|US-GDP|7000000|1979}}}} per mile ({{convert|{{inflation|US-GDP|7|1979}}|e6$/mi|e6$/km|abbr=off|disp=output number only}}/km) in {{inflation/year|US-GDP}}{{inflation/fn|US-GDP}}) to complete.<ref name="June 8, 1977">{{cite news |last=Loh |first=Jules |date=June 8, 1977 |title=Louisiana 'oasis' is cypress-paneled |page=6 |newspaper=The Tuscaloosa News |location=Tuscaloosa, Alabama |url=https://news.google.com/newspapers?id=WggdAAAAIBAJ&sjid=_Z0EAAAAIBAJ&dq=manchac%20bridge&pg=6767%2C1496622 |accessdate=July 20, 2010}}</ref>
+The '''Manchac Swamp Bridge''' is a twin [[Trestle bridge#Concrete trestles|concrete trestle]] [[bridge]] near [[Manchac, Louisiana|Manchac]] in the [[US state]] of [[Louisiana]].<ref name="Melaragno"/> With a total length of {{convert|22.80|mi|km}},<ref>{{Cite web |title=Manchac Swamp Bridge |url=http://www.atlasobscura.com/places/manchac-swamp-bridge-2 |access-date=May 2, 2019 |website=Atlas Obscura |language=en}}</ref><ref>{{Cite web |title=Manchac Swamp Bridge, one of the longest bridges in the world over water |url=https://www.dangerousroads.org/north-america/usa/6568-manchac-swamp-bridge.html |access-date=March 7, 2022 |website=www.dangerousroads.org |language=en-gb}}</ref> it is one of the [[List of bridges by length|longest bridges in the world over water]] and is the longest bridge on the [[Interstate Highway System]]. Some claim it is the longest toll-free road bridge in the world.<ref>{{Cite web |date=August 1, 2017 |title=Longest Bridges in North America |url=https://www.worldatlas.com/articles/longest-bridges-in-north-america.html |access-date=March 7, 2022 |website=WorldAtlas |language=en-US}}</ref> The bridge carries [[Interstate 55 in Louisiana|Interstate 55]] and [[U.S. Route 51 in Louisiana|U.S. Route 51]] over the Manchac Swamp in [[Louisiana]] and represents a third of the highway's approximately {{convert|66|mi|km}} in Louisiana. Opening in 1979,<ref name="Melaragno"/> its [[Deep foundation|piles]] were driven {{convert|250|ft|m}} beneath the swamp and with the cost of the span being $7&nbsp;million per mile ({{convert|7|e6$/mi|e6$/km|abbr=unit|disp=output number only}}/km) (equivalent to ${{formatprice|{{inflation|US-GDP|7000000|1979}}}} per mile ({{convert|{{inflation|US-GDP|7|1979}}|e6$/mi|e6$/km|abbr=off|disp=output number only}}/km) in {{inflation/year|US-GDP}}{{inflation/fn|US-GDP}}) to complete.<ref name="June 8, 1977">{{cite news |last=Loh |first=Jules |date=June 8, 1977 |title=Louisiana 'oasis' is cypress-paneled |page=6 |newspaper=The Tuscaloosa News |location=Tuscaloosa, Alabama |url=https://news.google.com/newspapers?id=WggdAAAAIBAJ&sjid=_Z0EAAAAIBAJ&dq=manchac%20bridge&pg=6767%2C1496622 |accessdate=July 20, 2010}}</ref>
 [[File:Lake Pontchartrain by Sentinel-2.jpg|thumb|A satellite view of the Manchac Swamp bridge (to the left) and the nearby [[Lake_Pontchartrain_Causeway|Pontchartrain bridge]]]]

Revision as of 17:52, 21 March 2023

See also

References