Douglas County, Wisconsin
LS03
2858100
390.23
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Amnicon Lake is listed as impaired due to sediment. In 2010, it was delisted for mercury based on 2006 walleye data and phosphorus was delisted in 2014. In 2020 excess algal growth was found and added to the list. New water quality data reviewed in the 2024 cycle confirmed the algal listing.Pollutant
Unknown Pollutant
Listed For
Recreation
Impairments
Excess Algal Growth
Current Use
Restricted Recreation
Listing Status
303d Listed
Attainable Use
Recreation
Priority
Low
Designated Use
Recreation
303(d) ID
2020-133
Listing Date
4/1/2020
Impaired Water Notes
This water was assessed during the 2020 listing cycle; chlorophyll sample data exceeded 2020 WisCALM listing thresholds for the Recreation use. Chlorophyll sample data were clearly below listing thresholds for the Fish and Aquatic Life use.
Date
7/12/2019
Pollutant
Total Phosphorus
Listed For
Fish and Aquatic Life
Impairments
NA
Current Use
Unsupported Aquatic Life
Listing Status
Pollutant Removed
Attainable Use
Default - Fish and Aquatic Life
Priority
Delisted 2014
Designated Use
Default - Fish and Aquatic Life
303(d) ID
7
Listing Date
4/1/1998
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 Fish and Aquatic Life use.
Date
7/13/2017
Impaired Water Notes
Newly added phosphorus based on new data- 2008. Clarified impairments: dissolved oxygen for total phophorus
Date
3/15/2010
Impaired Water Notes
TP and/or chlorophyll data from the period 2006-2010 were insufficient to assess per 2012 WisCALM. However, the previous assessment(s) were carried forward, and the lake remains listed as impaired.
Date
6/13/2011
Impaired Water Notes
This water was assessed during the 2014 listing cycle; total phosphorus and chlorophyll data clearly met Fish and Aquatic Life thresholds. Total phosphorus and chlorophyll data do not exceed Recreation use thresholds.
Date
1/15/2014
Pollutant
Mercury
Listed For
Impairments
NA
Current Use
Listing Status
Pollutant Removed
Attainable Use
Priority
Delisted 2010
Designated Use
303(d) ID
7
Listing Date
4/1/1998
Impaired Water Notes
Delist Hg FCA in 2010 based on 2006 Walleye data (12 samples). This waterbody has data after the methodology changed for fish consumption advice. This waterbody has enough fish tissue samples to remove these waters from the 303(d) list as a FCA, although they will still all be covered under the state's general advisory for fish consumption. The post-2000 data confirms that these sites do not need advice more stringent that the statewide general advice.
Date
10/8/2009
Pollutant
Sediment/Total Suspended Solids
Listed For
Fish and Aquatic Life
Impairments
Elevated Water Temperature, Degraded Habitat
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
7
Listing Date
4/1/1998
Impaired Water Notes
Newly added Sediment based on new data - 2008.
Clarified impairments: degraded habitat, elevated water temperature.
Date
3/15/2010