St. Louis River Watershed Stressor Identification Report

This report summarizes the principal causes, or “stressors,” contributing to impaired fish and aquatic macroinvertebrate communities in 23 impaired stream reaches within the St. Louis River drainage. Ultimately, the results of this report will be used to guide several processes, including; Total Maximum Daily Load (TMDL) development; defining the need for research and development of new water quality standards; and prioritizing additional monitoring, restoration, and protection strategies. Numerous candidate causes for impairment were evaluated for the impaired streams covered in this document.