Manchac Swamp Bridge
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 $21.4 million per mile ($13 million/km) in 2021[5]) to complete.[6]
A satellite view of the Manchac Swamp bridge (to the left) and the nearby Pontchartrain bridge
Manchac Swamp Bridge | |
|---|---|
 | |
| Coordinates | 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[1] |
| Location | |
See also
References
- 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 January 1, 2023. United States Gross Domestic Product deflator figures follow the Measuring Worth 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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