Manchac Swamp Bridge

Manchac Swamp Bridge
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 / 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 36,710 meters (120,400 feet)
Width 95 m
History
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) it is one of the longest bridges in the world over water. It is the longest bridge on the interstate system. Some claim it is the longest toll-free road bridge in the world. 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.[2]

See also

References

  1. 1 2 3 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.


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