Forest, Oneida County, Wisconsin
UW44
1605800
518.20
Condition has remained stable; water is not impaired.
Notes
Sevenmile Lake was evaluated every two-year cycle from 2014 to 2024; it was put on the Impaired Waters List for phosphorus in the 2014 cycle and following cycles showed slightly elevated levels. In the 2022 cycle phosphorus levels were low enough for delisting proposal. Evaluation of both algae and aquatic plant communities showed a healthy system.Pollutant
Total Phosphorus
Listed For
Impairments
NA
Current Use
Listing Status
Water Delisted
Attainable Use
Priority
Delisted 2022
Designated Use
303(d) ID
2014-260
Listing Date
4/1/2014
Impaired Water Notes
This water was assessed during the 2018 listing cycle; new chlorophyll sample data were clearly below 2018 WisCALM listing thresholds for the Recreation use and the Fish and Aquatic Life use. Total Phosphorus sample data were not clearly below listing thresholds.
Date
7/13/2017
Impaired Water Notes
This water was assessed during the 2014 listing cycle; total phosphorus sample data exceed 2014 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use, however chlorophyll data do not exceed REC or FAL thresholds.
Date
1/10/2014
Impaired Water Notes
Delisting based on best professional judgment and 5 years worth of TP samples with "May Meet" results. Watershed is largely forested (97%) and the lake supports a hearty coldwater fish community.
Date
7/16/2021
Pollutant
Mercury
Listed For
Impairments
NA
Current Use
Listing Status
Water Delisted
Attainable Use
Priority
Delisted 2006
Designated Use
303(d) ID
423
Listing Date
4/1/1998
Impaired Water Notes
New fish tissue analysis showed no need for specific fish consumption advisories for this waterbody. This mercury listing was proposed for removal from the impaired waters list in 2006.
Date
4/1/2006