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The Twin Ports of Duluth, Minnesota and Superior, Wisconsin are located at the western part of Lake...

The Twin Ports of Duluth, Minnesota and Superior, Wisconsin are located at the western part of Lake Superior (the westernmost of North America's Great Lakes). They are twin cities and seaports, connected to the Atlantic Ocean through the Great Lakes and the St. Lawrence Seaway. The Twin Ports are at the core of the U.S. Census Bureau's "Duluth-Superior Metropolitan Statistical Area", which includes all of Wisconsin's Douglas County, and Minnesota's Carlton and St. Louis counties. With a 2000 census population of 275,486, the Duluth-Superior MSA ranked as the 163rd largest metropolitan area in the United States. The area is home to two very long bridges: the Richard I. Bong Memorial Bridge (carrying U.S. Highway 2) and the John Blatnik Bridge (carrying I-535 and U.S. Highway 53). While their central spans are not notably lengthy, the overall lengths are very impressive, with each reaching across more than 1.5 miles (2.5 km) of water. However, when visitors to the area come to see bridges, they pay much more attention to the historic Aerial Lift Bridge that serves as a gateway to the port. It must be raised and lowered whenever ships enter or exit the Duluth side of the harbor,