Impaired Water - Mississippi River (Mississippi (Reach 4) Coon-Yellow - Pool 10 portion - Wis R to LD 9))
Crawford, Grant County, Wisconsin
BL01, GP07, LW01
721000
630.70 - 648.00
17.30
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
This reach of the Mississippi River is impaired for general water quality restrictions due to mercury and PCBs in the water column exceeding water quality standards, as well as specific advisories for PCBs and Mercury in fish tissue. The mercury-contaminated fish tissue listing was addded in 2010.

Phosphorus was evaluated every two years between 2012 and 2020; 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
2012-2017
Listing Date
4/1/2012
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, no biological data (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scores) were available to assess biological impairment).
Date
2/26/2014

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 2018 listing cycle; new total phosphorus sample data exceed 2018 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
4/13/2017

Impaired Water Notes
This water was assessed during the 2020 listing cycle; new total phosphorus sample data exceed 2020 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
8/8/2019

 
Pollutant
PCBs
Listed For
General
Impairments
Impairment Unknown, PCBs Contaminated Fish Tissue
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
592
Listing Date
4/1/1998
 
Pollutant
Mercury
Listed For
General
Impairments
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
4/1/1998