Manchac Swamp Bridge

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Manchac Swamp Bridge
Manchac Bridge.jpg
Coordinates 30°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
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
Total length 36,710 meters (120,400 feet)
Width 95 m
Opened 1979[1]

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)[citation needed] it is one of the longest bridges in the world over water. Some claim it is the longest toll-free road bridge in the world.[citation needed] The bridge carries Interstate 55 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.[2]

See also[edit]


  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. ^ Loh, Jules (June 8, 1977). "Louisiana 'oasis' is cypress-paneled". The Tuscaloosa News. Tuscaloosa, AL. p. 6. Retrieved June 20, 2010.