Oneida County, Wisconsin
UW40
1569900
401.22
Condition has remained stable; water is not impaired.
Notes
Thompson Lake was put on the 303(d) list due to mercury in 1998 and was removed in 2020 based on 2001 updated Fish Consumption advisories.
This lake was assessed for phosphorus and algae every two-year cycle from 2012 and 2024; in 2016 this lake was listed for excess algal growth and this impairment was confirmed in 2018. In the 2020 and 2022 cycles algal levels were good and the listing was removed. This lake is on the Waters Attaining Standards List.Pollutant
Unknown Pollutant
Listed For
Impairments
NA
Current Use
Listing Status
Water Delisted
Attainable Use
Priority
Delisted 2020
Designated Use
303(d) ID
2016-231
Listing Date
4/1/2016
Impaired Water Notes
This water was assessed during the 2016 listing cycle; chlorophyll sample data exceed 2016 WisCALM listing thresholds for the Recreation use, however, total phosphorus data do not exceed REC thresholds. Total phosphorus and chlorophyll data do not exceed Fish and Aquatic Life thresholds.
Date
8/7/2015
Impaired Water Notes
This water was assessed during the 2020 listing cycle; new chlorophyll sample data were clearly below 2020 WisCALM listing thresholds for the Recreation use and the Aquatic Life use.
Date
8/12/2019
Pollutant
Mercury
Listed For
Impairments
NA
Current Use
Listing Status
Water Delisted
Attainable Use
Priority
Delisted 2020
Designated Use
303(d) ID
485
Listing Date
4/1/1998
Impaired Water Notes
This listing was part of a set removed from the impaired waters list due to a change in fish consumption advisory levels in 2001. In 2001 Wisconsin DNR put into effect a statewide fish consumption advisory for mercury due to atmospheric deposition. Most of the lakes removed from the specific fish consumption advisories list in 2001 were not removed from the impaired waters list even though the thresholds had changed. For the 2020 assessment process WDNR requested delisting of 91 waters with residual mercury listings from prior to 2001. This request was approved by US EPA.
Date
9/4/2018