<page_title> List of longest bridges </page_title> <table> <cell> Manchac Swamp Bridge (I-55/US 51 across Manchac Swamp in Louisiana) <col_header> Name </col_header> <col_header> m </col_header> </cell> <cell> (Viaduct) <col_header> Main Span </col_header> <col_header> ft </col_header> </cell> <cell> 1979 <col_header> Completed </col_header> </cell> </table>
The I-55, consisting of a twin-span viaduct through the Manchac swamp, was completed in 1979 and is one of the longest bridges in the world.