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|direction_b=North |terminus_b= at Mississippi state line north of Kentwood |parishes=St. John the Baptist, Tangipahoa |previous_type=LA |previous_route=50 |next_type=LA |next_route=52 |browse= |}} U.S. Highway 51 (US 51) in Louisiana runs in a north–south direction from the national southern terminus at US 61 in LaPlace to the Mississippi state line at Osyka. After heading north through LaPlace to a junction with Interstate 10 (I-10) west of New Orleans, the highway joins I-55 on a twin-span viaduct across the Manchac Swamp. The bridge, which passes between Lakes Pontchartrain and Maurepas, is the second-longest bridge over water in the United States and serves as a vital hurricane evacuation route for the New Orleans metropolitan area. With Ponchatoula served by the highway's only designated business route, US 51 splits from the interstate in the neighboring city of Hammond. For the remainder of its journey in southeastern Louisiana, the route closely parallels I-55, which carries the bulk of through traffic toward Jackson, Mississippi and points north. US 51 serves local traffic through a string of communities in Tangipahoa Parish situated along the Canadian National Railway line, including the towns of Independence, Amite City, and Kentwood. Prior to 1951, US 51 began in downtown New Orleans and followed the route of US 61 to its current southern terminus in LaPlace. For a time in the late 1920s to mid-1930s, however, it was intended to follow a scenic route along the shore of Lake Pontchartrain known as the New Orleans–Hammond Lakeshore Highway. Construction difficulties and budget limitations led to the abandonment of the project before the portion through the swamps of St. Charles Parish could be completed. ==Route description== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「U.S. Route 51 in Louisiana」の詳細全文を読む スポンサード リンク
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