Manchac Swamp bridge

Manchac Swamp Bridge
Other name(s)	I-55 Manchac Swamp Crossing
Carries	Interstate 55
Crosses	Manchac Swamp
Locale	St. John the Baptist Parish / Tangipahoa Parish, Louisiana, USA
Maintained by	LA DOT
Total length	36,710 meters (120,400 feet)
Opened	1979[1]
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

The Manchac Swamp Bridge is a twin concrete trestle bridge^[1] in the US 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. 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]

References

1. ^ ^{a b c} Melaragno, Michele G. (1998). Preliminary Design of Bridges for Architects and Engineers. CRC Press. p. 377. ISBN 9780824701840. http://books.google.com/books?id=EGfxR4_TEUAC&lpg=PA377&dq=Manchac%20bridge%20interstate&pg=PA377#v=onepage&q=Manchac%20bridge%20interstate&f=false. Retrieved June 20, 2010. 
2. ^ Loh, Jules (June 8, 1977). "Louisiana 'oasis' is cypress-paneled". The Tuscaloosa News (Tuscaloosa, AL): p. 6. http://news.google.com/newspapers?id=WggdAAAAIBAJ&sjid=_Z0EAAAAIBAJ&dq=manchac%20bridge&pg=6767%2C1496622. Retrieved June 20, 2010.