Impaired Water - Mississippi River (Mississippi (Reach 4) Coon-Yellow - Pool 9 portion - LD 9 to LD 8))
Crawford, Vernon County, Wisconsin
BL01, BL02
721000
648.00 - 679.10
31.10
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
This reach of the Mississippi River was originally listed in 1998 due to PCB-contamintated fish tissue. A general water quality use impairment due to mercury and PCB levels in the water column exceeding water quality standards as well as specific advisories for PCBs and Mercury in fish tissue was added in 2010.

This portion of the Mississippi River was evaluated for phosphorus every two years from 2012 to 2020 and levels were found to be too high for healthy plant, bug, and fish communities.
In 2020 this water was assessed for chloride and no impairment for that parameter was found.
Listing Details
Pollutant
Total Phosphorus
Listed For
Fish and Aquatic Life
Impairments
Impairment Unknown
Current Use
WWSF - Warmwater Sport Fishery
Listing Status
303d Listed
Attainable Use
WWSF - Warmwater Sport Fishery
Priority
Low
Designated Use
WWSF - Warmwater Sport Fishery
303(d) ID
2012-2016
Listing Date
4/1/2012
Impaired Water Notes
This water was assessed during the 2018 listing cycle; new total phosphorus sample data exceed 2018 WisCALM listing criteria for the Fish and Aquatic Life use.
Date
8/1/2017

Impaired Water Notes
This stream segment was assessed during the 2012 listing cycle, and total phosphorus sample data exceed criteria for the fish and aquatic life use
Date
3/1/2013

Impaired Water Notes
This water was assessed during the 2014 listing cycle; total phosphorus sample data exceed 2014 WisCALM listing criteria for the Fish and Aquatic Life use, however, available biological data do not indicate impairment (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scored in the "poor" condition category).
Date
2/26/0114

Impaired Water Notes
This water was assessed during the 2016 listing cycle; total phosphorus sample data exceed 2016 WisCALM listing criteria for the Fish and Aquatic Life use, however, no biological data (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scores) were available to assess biological impairment.
Date
10/7/2015

Impaired Water Notes
This water was assessed during the 2020 listing cycle; new total phosphorus sample data exceed 2020 WisCALM listing criteria for the Aquatic Life use.
Date
8/8/2019

 
Pollutant
Mercury
Listed For
General
Impairments
Mercury Contaminated Fish Tissue, Impairment Unknown
Current Use
Restricted General Water Use
Listing Status
303d Listed
Attainable Use
General Water Use
Priority
Low
Designated Use
General Water Use
303(d) ID
530
Listing Date
4/1/2010
Impaired Water Notes
Specific Advisory for both PCBs and Mercury. The Water Use Restrictions have been in place for the Mississippi River due to mercury and PCBs since 1998. The specific advisory for mercury was added as a new impairment in 2010.
Date
11/26/2009

 
Pollutant
PCBs
Listed For
Fish Consumption
Impairments
Impairment Unknown, PCBs 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
530
Listing Date
4/1/1998
Impaired Water Notes
Specific Advice for PCBs. General Water Use Restrictions for PCBs.
Date
4/1/2008