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Lake Superior basin

Clear, cold and deep, Lake Superior - the largest expanse of freshwater in the world - forms Wisconsin's north coast. The Wisconsin Department of Natural Resources in the Lake Superior basin provides this site about fisheries, forests, wildlife, pollution prevention, watershed protection, tributaries, environmental protection and regulation, invasive aquatic species, recreation and special programs.

Cleanest of the Great Lakes, the Lake Superior ecosystem faces threats from toxic pollution, tributary erosion, contaminated sediments, habitat loss and degradation and exotic species. The governors of Wisconsin, Michigan and Minnesota signed the Binational Program to Protect and Restore the Lake Superior basin in 1991.

Water resource information for specific watersheds

Watershed name/view details Watershed code/map Watershed size Lists (streams, lakes, bays & harbors) Counties Water management unit (WMU) Major drainage system
Amnicon and Middle Rivers LS03 288.92 mi 2 LS03 Water lists Douglas Lake Superior Lake Superior
Bayfield Peninsula Northwest LS06 236.05 mi 2 LS06 Water lists Bayfield Lake Superior Lake Superior
Bayfield Peninsula Southeast LS07 301.48 mi 2 LS07 Water lists Ashland, Bayfield Lake Superior Lake Superior
Black and Upper Nemadji River LS02 125.62 mi 2 LS02 Water lists Douglas Lake Superior Lake Superior
Bois Brule River LS04 199.64 mi 2 LS04 Water lists Douglas, Bayfield Lake Superior Lake Superior
Fish Creek LS08 156.55 mi 2 LS08 Water lists Ashland, Bayfield Lake Superior Lake Superior
Iron River LS05 213.39 mi 2 LS05 Water lists Douglas, Bayfield Lake Superior Lake Superior
Lower Bad River LS09 123.92 mi 2 LS09 Water lists Ashland, Iron, Bayfield Lake Superior Lake Superior
Marengo River LS12 217.53 mi 2 LS12 Water lists Ashland, Bayfield Lake Superior Lake Superior
Montreal River LS15 226.26 mi 2 LS15 Water lists Ashland, Iron, Vilas Lake Superior Lake Superior
Potato River LS11 139.92 mi 2 LS11 Water lists Ashland, Iron Lake Superior Lake Superior
Presque Isle River LS16 108.05 mi 2 LS16 Water lists Vilas Lake Superior Lake Superior
St. Louis and Lower Nemadji River LS01 159.67 mi 2 LS01 Water lists Douglas Lake Superior Lake Superior
Tyler Forks LS13 78.76 mi 2 LS13 Water lists Ashland, Iron Lake Superior Lake Superior
Upper Bad River LS14 134.68 mi 2 LS14 Water lists Ashland, Iron Lake Superior Lake Superior
White River LS10 366.15 mi 2 LS10 Water lists Ashland, Bayfield Lake Superior Lake Superior

Watershed map