Manchac Swamp Bridge
The Manchac Swamp Bridge is a twin concrete trestle bridge[1] in the U.S. state of Louisiana. 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 one-third of the highway's approximately 66 miles 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 to complete.[5]
Manchac Swamp Bridge | |
|---|---|
 | |
| Coordinates | 30.302946°N 90.405807°W |
| Carries |   |
| 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 | 95 m |
| History | |
| Opened | 1979[1] |
| |
See also
- List of bridges in the United States
- List of longest bridges
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 2019-05-02.
- "Manchac Swamp Bridge". www.dangerousroads.org. Retrieved 2019-05-02.
- "Longest Bridges in North America". WorldAtlas. Retrieved 2019-05-02.
- Loh, Jules (June 8, 1977). "Louisiana 'oasis' is cypress-paneled". The Tuscaloosa News. Tuscaloosa, AL. p. 6. Retrieved June 20, 2010.
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