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
The Manchac Swamp Bridge is a twin concrete trestle bridge near Manchac in the US state of Louisiana.[1] It 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.
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, and some claim it is the longest toll-free road bridge in the world.[4]
Opened in 1979,[1] with piles driven 250 feet (76 m) beneath the swamp, it cost $7 million per mile ($4.3 million/km) (equivalent to $23.7 million per mile ($15 million/km) in 2023[5]) to construct.[6]
A satellite view of the Manchac Swamp bridge (to the left) and the nearby Pontchartrain bridge
^ abcMelaragno, 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 November 30, 2023. United States Gross Domestic Product deflator figures follow the MeasuringWorth 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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Global Information
I-55 / US 51
