Interstate 55

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Interstate 55 marker

Main route of the Interstate Highway System
Main • Auxiliary • Business

Interstate 55 (I-55) is an Interstate Highway in the central United States. Its odd number indicates that it is a north–south Interstate Highway. I-55 goes from LaPlace, Louisiana (25 miles (40 kilometers) west of New Orleans) at Interstate 10 to Chicago at U.S. Route 41 (Lake Shore Drive), at McCormick Place. A common nickname for the highway is "double nickel."

The section of I-55 between Chicago and St. Louis was built as an alternate route for U.S. Highway 66. It crosses the Mississippi River twice: once at Memphis, Tennessee, and again at St. Louis, Missouri.

In 2009, officials in Green Bay, Wisconsin, began a campaign to have U.S. Route 41 in that area designated as I-55. A section of US 41 in Wisconsin is in the process of being rebuilt as an Interstate Highway. Some local officials in the Green Bay area think that designating US 41 as Interstate 55 would bring additional attention to that area. The main alternative is designating that highway as a spur of I-43. (Sourced from the Green Bay Press Gazette 02-08-09)


Route description


In Louisiana, I-55 runs nearly 66 miles (106 km) from south to north, from Interstate 10 near Laplace - roughly 20 miles (32 km) west of New Orleans - to the Mississippi state line near Kentwood, Louisiana. Approximately 1/3 of the distance consists of the Manchac Swamp bridge, supposedly the third-longest viaduct in the world.

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