Impaired Water - Neshonoc Lake (Neshonoc Lake)
La Crosse County, Wisconsin
BL04, BL05
1653500
606.50
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
Lake Neshonoc is an impoundment of the La Crosse River beginning at the La Crosse River dam (river mile 17.9) and continuing upstream for approximately 1.2 miles (river mile 19.1). Lake Neshonoc is impaired by total phosphorus, total suspended solids, and mercury. The Special Fish Consumption Listing for PCBs was removed in 2012.

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

This water was assessed during the 2016 listing cycle; total phosphorus sample data exceed 2016 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use.

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.
Listing Details
Pollutant
Sediment/Total Suspended Solids
Listed For
Fish and Aquatic Life
Impairments
Eutrophication, Elevated pH
Current Use
Impounded Flowing Water
Listing Status
303d Listed
Attainable Use
WWSF - Warmwater Sport Fishery
Priority
Low
Designated Use
WWSF - Warmwater Sport Fishery
303(d) ID
309
Listing Date
4/1/1998
Impaired Water Notes
The overwhelming majority of nutrient and bacterial load entering Lake Neshonoc is derived from nonpoint sources. Upstream of Lake Neshonoc the following municipalities have WPDES permits: Bangor, Rockland, Sparta, Fort McCoy. The following businesses have WPDES permits upstream of Lake Neshonoc: Webster Industries, Foremost Farms (Sparta).
Date
10/27/2010

 
Pollutant
PCBs
Listed For
Fish Consumption
Impairments
NA
Current Use
Specific Restricted Fish Consumption
Listing Status
Pollutant Removed
Attainable Use
Unrestricted Fish Consumption
Priority
Delisted 2012
Designated Use
Unrestricted Fish Consumption
303(d) ID
309
Listing Date
4/1/1998
Impaired Water Notes
Lakes Condition Monitoring - 1998 (WDNR) - Monthly water chemistry sampling from April through September using Ambient Lakes Protocol. Summer sampling of surface waters found pH exceedances (>9) on 8 of 13 dates during 1994 and 1998.
Date
10/27/2010

Impaired Water Notes
Lake Neshonoc is an impoundment of the La Crosse River beginning at the La Crosse River dam (river mile 17.9) and continuing upstream for approximately 1.2 miles (river mile 19.1). Lake Neshonoc is impaired by total phosphorus, total suspended solids, and mercury. The Special Fish Consumption Listing for PCBs was removed in 2012.
Date
11/16/2013

Impaired Water Notes
Special PCB advice was removed in 2011.
Date
3/23/2012

 
Pollutant
Mercury
Listed For
Fish Consumption
Impairments
Mercury Contaminated Fish Tissue
Current Use
Specific Restricted Fish Consumption
Listing Status
303d Listed
Attainable Use
Unrestricted Fish Consumption
Priority
Low
Designated Use
Unrestricted Fish Consumption
303(d) ID
309
Listing Date
4/1/1998
Impaired Water Notes
Lakes Condition Monitoring - 1998 (WDNR) - Monthly water chemistry sampling from April through September using Ambient Lakes Protocol. Summer sampling of surface waters found pH exceedances (>9) on 8 of 13 dates during 1994 and 1998.
Date
10/27/2010

 
Pollutant
Total Phosphorus
Listed For
Recreation
Impairments
Eutrophication, Excess Algal Growth, Elevated pH
Current Use
Restricted Recreation
Listing Status
303d Listed
Attainable Use
Full Body Contact - Swimming, Boating
Priority
Low
Designated Use
Full Body Contact - Swimming, Boating
303(d) ID
309
Listing Date
4/1/1998
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 2014 listing cycle; total phosphorus sample data exceed 2014 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use.
Date
1/20/2014

Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus sample data exceed 2016 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use.
Date
10/9/2015