Impaired Water - Beaver Dam Lake (Beaver Dam Lake)
Dodge County, Wisconsin
UR03
835100
6,401.56
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
This water was originally listed in 2010 due to a eutrophication impairment of the fish and aquatic life use caused by excess total phosphorus.

This water was assessed during the 2012 listing cycle, and total phosphorus sample and chlorophyll data exceed 2012 WisCALM listing criteria for the fish and aquatic life and recreation uses. Based on the 2012 assessment, a recreation use impairment (excess algal growth) caused by total phosphorus was added to this listing.

This water was assessed during the 2014 listing cycle; total phosphorus sample data overwhelmingly exceed 2014 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use and chlorophyll data exceeded REC and FAL thresholds.

This water was assessed during the 2016 listing cycle; total phosphorus sample data overwhelmingly exceeded 2016 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use, and chlorophyll data overwhelmingly exceeded FAL thresholds and exceeded REC thresholds.

This water was assessed during the 2018 listing cycle; new total phosphorus and chlorophyll sample data exceeded 2018 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use. New data in 2020 confirm listing information.
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
2010-6
Listing Date
4/1/2010
Impaired Water Notes
EPA approved an amendment to the Rock River Basin TMDL that covers Beaver Dam Lake and the Beaver Dam POTW. (wbic: 835100)
Date
8/3/2018

Impaired Water Notes
This water was assessed during the 2018 listing cycle; new total phosphorus and chlorophyll sample data exceeded 2018 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use.
Date
7/10/2017

Impaired Water Notes
Beaver Dam lake experiences significant summer algae blooms. There have been reported fish kills due to low oxygen although little DO data exists. I would expect significant diurnal fluctuations. Average Total Phosphorus concentration (2006-2008) is .34 mg/l, ten times higher than the impairment threshold of .04 mg/l for shallow lowland lakes. Average TSI based on chlorophyll a (2004-2008) is 75, which also exceeds the listing threshold of 71 for shallow lowland lakes.
Date
10/16/2009

Impaired Water Notes
Public comment in 2006 to list water. Document is in data documentation folders on central drive.
Date
7/30/2007

Impaired Water Notes
Per 2012 WisCALM, exceeds fish and aquatic life and recreation thresholds for both TP & Chl a (2006-2010).
Date
6/14/2011

Impaired Water Notes
This water was assessed during the 2014 listing cycle; total phosphorus sample data overwhelmingly exceed 2014 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use and chlorophyll data exceeded REC and FAL thresholds.
Date
2/28/2014

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 and Fish and Aquatic Life use, and chlorophyll data overwhelmingly exceeded FAL thresholds and exceeded REC thresholds.
Date
10/9/2015

Impaired Water Notes
This water was assessed during the 2020 listing cycle; total phosphorus sample data overwhelmingly exceeded 2020 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use, and chlorophyll data also exceeded REC and FAL thresholds. Based on the most updated information, no change in existing impaired waters listing is needed.
Date
6/19/2019