Manitowoc County, Wisconsin
MA01
67100
5.98
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Gass Lake was evaluated for phosphorus and algae every two years between 2016 and 2024. Phosphorus levels were found to be too high, which was reflected in algal blooms. Gass Lake is part of the Pine Creek Watershed 9-Key Element Plan. This water is part of the Northeast Lakeshore TMDL, approved in 2023.Pollutant
Total Phosphorus
Listed For
Recreation
Impairments
High Phosphorus Levels, Excess Algal Growth
Current Use
Restricted Recreation
Listing Status
TMDL Approved
Attainable Use
Recreation
Priority
Not Applicable
Designated Use
Recreation
303(d) ID
2016-194
Listing Date
4/1/2016
Impaired Water Notes
This water was assessed during the 2018 listing cycle; new total phosphorus sample data exceeded 2018 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use; chlorophyll data only exceeded REC thresholds, not FAL.
Date
7/11/2017
Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus and chlorophyll sample data exceed 2016 WisCALM listing thresholds for the Recreation use, but do not exceed Fish and Aquatic Life thresholds.
Date
7/31/2015
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, but only phosphorus also exceeded Aquatic Life thresholds.
Date
8/1/2019
Impaired Water Notes
This water was assessed during the 2022 listing cycle; total phosphorus and chlorophyll sample data exceeded 2022 WisCALM listing thresholds for the Recreation use, but only phosphorus also exceeded Aquatic Life thresholds.
Date
5/26/2021