Lake of the Woods - Excess Nutrients: TMDL project

The Lake of the Woods Total Maximum Daily Load study addresses the nutrient impairment of Minnesota’s portion of the Lake of the Woods, which does not meet water quality standards for total phosphorus and Chlorophyll-a concentrations (related to algae blooms) and Secchi disk depth (transparency).

Phosphorus is the focus of this study because it drives a wide range of biological responses in the lake that affect beneficial uses such as drinking, swimming, and aquatic recreation. Ongoing phosphorus reduction efforts are a management priority in both Minnesota and Canada. The public notice period for the report ended March 24, 2021. Additional information was provided in a press release.


Map and location

The LoW basin is located in northern Minnesota and southern Canada.

lake of the woods basin map of nutrient tmdl