Lake Superior Basin

Lake Superior
The Lake Superior basin is located in Northern Wisconsin and consists of parts of Ashland, Iron, Douglas, and Bayfield counties. The Lake Superior Basin covers approximately 6,200 square miles in Wisconsin, Minnesota, Michigan, and Alberta, Canada. Shoreline length: 2,726 miles (including islands). It is the largest freshwater lake in the world. A few of the watersheds located in the Lake Superior Basin are the Amnicon and Middle Rivers, the Northwest and Southeast Bayfield Peninsula, the Iron River, the Montreal River, and the White River. Although Lake Superior is considered the cleanest of the Great Lakes, the basin still faces significant threats from toxic pollution and contaminated sediments.

For more information about the Lake Superior basin, go to the DNR website at

Visit these sites to learn more about how you can get involved and Protect the Lake Superior Basin with these partner organizations:

Regional Storm Water Protection Team

Superior Watershed Partnership and Land Trust