The St. Louis River watershed covers 1,920 acres in north eastern Minnesota. The St. Louis River travels 195 miles until it drains into the Duluth-Superior harbor. The watershed itself contains many branching tributaries due to a small gradient. The Cloquet River and Whiteface River join the St. Louis river and adds one third and one half of its total flow.

Erosion is a problem for the St. Louis River causing high turbidity levels as well as chemical contaminants found in its waters. The St. Louis River watershed underwent evaluation by the MPCA to determine the health of the area. It was found to have a high contamination level of mercury in its streams and lakes. This problem is being addressed through BMP’s and contaminated water and sediment clean up.