Impaired Water - Delton Lake (Delton Lake)
Sauk County, Wisconsin
LW26
1295400
249.24
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Delton Lake was evaluated for phosphorus every two years from 2016 to 2020. Phosphorus levels were found to be too high, which was reflected in algal blooms. This water is part of the Wisconsin River TMDL, approved 2019.
Listing Details
Pollutant
Total Phosphorus
Listed For
Recreation
Impairments
Eutrophication, Excess Algal Growth
Current Use
Restricted Recreation
Listing Status
TMDL Approved
Attainable Use
Full Body Contact - Swimming, Boating
Priority
Not Applicable
Designated Use
Full Body Contact - Swimming, Boating
303(d) ID
2016-227
Listing Date
4/1/2016
Impaired Water Notes
This water was assessed during the 2018 listing cycle; new total phosphorus sample data overwhelmingly exceeded 2018 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use, and chlorophyll data also exceeded both thresholds.
Date
7/14/2017

Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus sample data overwhelmingly exceeded 2016 WisCALM listing thresholds for the Recreation use; however chlorophyll data did not exceed REC thresholds. Total phosphorus and chlorophyll data did not exceed Fish and Aquatic Life thresholds.
Date
8/3/2015

Impaired Water Notes
This water is part of the 2019 approved Wisconsin River TMDL addressing Total Phosphorus and Total Suspended Solids.
Date
6/10/2019

Impaired Water Notes
This water was assessed during the 2020 listing cycle; total phosphorus and chlorophyll sample data exceeded 2020 WisCALM listing thresholds for the Recreation use and Aquatic Life use.
Date
8/14/2019