Manchac Swamp Bridge

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Manchac Swamp Bridge
Manchac Bridge.jpg
Coordinates30°18′11″N 90°24′21″W / 30.302946°N 90.405807°W / 30.302946; -90.405807Coordinates: 30°18′11″N 90°24′21″W / 30.302946°N 90.405807°W / 30.302946; -90.405807
Carries I-55 / US 51
CrossesManchac Swamp
LocaleSt. John the Baptist Parish / Tangipahoa Parish, Louisiana, USA
Other name(s)I-55 Manchac Swamp Crossing
Maintained byLA DOTD
Characteristics
Total length22.8 miles (36.7 km)
Width312 feet (95 m)
History
Opened1979[1]
Location

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 (equivalent to $20 million per mile in 2019 dollars) to complete.[5]

See also[]

References[]

  1. ^ 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.
  2. ^ "Manchac Swamp Bridge". Atlas Obscura. Retrieved 2019-05-02.
  3. ^ "Manchac Swamp Bridge". www.dangerousroads.org. Retrieved 2019-05-02.
  4. ^ "Longest Bridges in North America". WorldAtlas. Retrieved 2019-05-02.
  5. ^ 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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