Polk County, Wisconsin
SC10
2640700
184.56
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Little Butternut Lake was evaluated for algae in 2020; samples indicated a potential problem with algal blooms but more samples were needed.
Little Butternut Lake was evaluated in the 2022 and 2024 cycles; phosphorus levels were too high, reflected in excess algal blooms. This lake was put on the 2022 Impaired Waters List. This water is covered by the Lake St. Croix TMDL Implementation 9-Key Plan (expires 2025).Pollutant
Total Phosphorus
Listed For
Fish and Aquatic Life
Impairments
Excess Algal Growth, Eutrophication
Current Use
Unsupported Aquatic Life
Listing Status
303d Listed
Attainable Use
Default - Fish and Aquatic Life
Priority
Low
Designated Use
Default - Fish and Aquatic Life
303(d) ID
2022-040
Listing Date
4/1/2022
Impaired Water Notes
This water was assessed during the 2022 cycle; new phosphorus sample data overwhelmingly exceeded 2022 WisCALM listing criteria for Aquatic Life and Recreation uses. Chlorophyll-a data exceeded REC thresholds. This water is covered by the Lake St. Croix TMDL Implementation 9-Key Plan (expires 2025).
Date
6/11/2021