Impaired Water - Shawano Lake (Shawano Lake)
Shawano County, Wisconsin
WR15
322800
6,215.51
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Shawano Lake is on the 303(d) list due to mercury and is proposed for removal based on 2001 updated Fish Consumption advisories.

This lake was assessed for phosphorus and algae in 2012, 2014, 2016, and 2018; impairment of high phosphorus levels and excess algal growth were found in 2016 and subsequent years.
Listing Details
Pollutant
Total Phosphorus
Listed For
Recreation
Impairments
Excess Algal Growth
Current Use
Restricted Recreation
Listing Status
TMDL Development
Attainable Use
Full Body Contact - Swimming, Boating
Priority
High
Designated Use
Full Body Contact - Swimming, Boating
303(d) ID
2016-205
Listing Date
4/1/2016
Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus and chlorophyll sample data exceeded 2016 WisCALM listing thresholds for the Recreation use, but did not exceed Fish and Aquatic Life thresholds.
Date
8/2/2015

 
Pollutant
Mercury
Listed For
Impairments
Mercury Contaminated Fish Tissue
Current Use
Listing Status
Deletion
Attainable Use
Priority
Not Applicable
Designated Use
303(d) ID
425
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