Impaired Water - Sevenmile Lake (Sevenmile Lake)
Forest, Oneida County, Wisconsin
UW44
1605800
518.20
Proposed for removal from impaired waters during assessment period.
Notes
Previously on the 303(d) list due to mercury, but was delisted 2006 because new data verfiy general fish consumption advisory only, not specific advisory.

Sevenmile Lake was evaluated every two-year cycle from 2014 to 2022; 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.
Listing Details
Pollutant
Total Phosphorus
Listed For
Impairments
NA
Current Use
Listing Status
TMDL Development
Attainable Use
Priority
High
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

 
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