Impaired Water - Clam Lake (Clam Lake, Upper)
Burnett County, Wisconsin
SC12
2656200
1,337.67
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
This water was assessed during the 2012 listing cycle, and total phosphorus and chlorophyll sample data exceed criteria for the recreation use.

This water was assessed during the 2014 listing cycle; total phosphorus sample data overwhelmingly exceed 2014 WisCALM listing thresholds for the Recreation use, and chlorophyll data exceed REC thresholds. Total phosphorus and chlorophyll data do not exceed Fish and Aquatic Life thresholds.

This water was assessed during the 2016 listing cycle; total phosphorus sample data overwhelmingly exceed 2016 WisCALM listing thresholds for the Recreation use, and chlorophyll data exceed REC thresholds. Total phosphorus and chlorophyll data do not exceed Fish and Aquatic Life thresholds.

This water was assessed during the 2018 listing cycle; new total phosphorus sample data overwhelmingly exceed 2018 WisCALM listing thresholds for the Recreation use and the Fish and Aquatic Life use, and chlorophyll data also exceeded REC and FAL thresholds.

Assessments during the 2020 listing cycle confirm levels of total phosphorus and chlorophyll are too high for healthy aquatic communities, like plants, bugs, and fish. In 2020, eutrophication was added as an impairment based on high chlorophyll levels.
Listing Details
Pollutant
Total Phosphorus
Listed For
Fish and Aquatic Life
Impairments
Eutrophication, Excess Algal Growth
Current Use
Salmonid Populations Stocked
Listing Status
303d Listed
Attainable Use
FAL - Fish and Aquatic Life Community
Priority
Low
Designated Use
FAL - Fish and Aquatic Life Community
303(d) ID
2012-3007
Listing Date
4/1/2012
Impaired Water Notes
This water was assessed during the 2014 listing cycle; total phosphorus sample data overwhelmingly exceed 2014 WisCALM listing thresholds for the Recreation use, and chlorophyll data exceed REC thresholds. Total phosphorus and chlorophyll data do not exceed Fish and Aquatic Life thresholds.
Date
2/28/2014

Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus sample data overwhelmingly exceed 2016 WisCALM listing thresholds for the Recreation use, and chlorophyll data exceed REC thresholds. Total phosphorus and chlorophyll data do not exceed Fish and Aquatic Life thresholds.
Date
10/12/2015

Impaired Water Notes
This water was assessed during the 2020 listing cycle; total phosphorus sample data overwhelmingly exceeded 2020 WisCALM listing thresholds for the Recreation use and Aquatic Life use, and chlorophyll data also exceeded REC and FAL thresholds. Eutrophication was added as an impairment in 2020 and it was changed to category 5W because it is part of the DNR approved restoration plan "Implementation Plan for the Lake St. Croix Nutrient Total Maximum Daily Load (2025)."
Date
7/26/2019