Manchac Swamp Bridge
Bridge in Louisiana, US
Manchac Swamp Bridge
The Manchac Swamp Bridge is a twin concrete trestle bridge near Manchac in the U.S. state of Louisiana. 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), 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. Opened in 1979, with piles driven 250 feet (76 m) beneath the swamp, it cost $7 million per mile ($4.3 million/km), equivalent to $25 million per mile ($16 million/km) in 2025, to construct.
Read on Wikipedia · Image Melanie Commander Thibodaux, CC BY 3.0
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