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The 4.5 mile (7.5 km) Huey P. Long Bridge in Jefferson Parish, Louisiana carries four lanes of US 90 and a two-track railroad line over the Mississippi River. Huey P. Long was a former governor of Louisiana. The bridge is a favorite railfan location, and is the longest railroad bridge in the U.S. The bridge is owned by the New Orleans Public Belt Railroad (AAR reporting mark NOPB), which is owned by the city of New Orleans and managed by the Public Belt Railroad Commission.
The Lake Pontchartrain Causeway is the longest highway bridge over water in the entire world, spanning 23.9 miles from Metairie on the South Shore to St. Tammany Parish on the North Shore. The original span opened to the public over 40 years ago in 1956 as a two way, two lane bridge.