Impaired Water - Rock River (Rock River)
Rock County, Wisconsin
LR04, LR11
788800
201.29 - 207.03
5.74
Water is impaired due to one or more pollutants and associated quality impacts.
Notes
This water has been on the Impaired Waters List for TP and TSS since 1998. Fish Consumption Advisory was removed. The TMDL for TP and TSS for the Rock River was approved by US EPA in September 2011.
Listing Details
Pollutant
Total Phosphorus
Listed For
Fish and Aquatic Life
Impairments
Low DO
Current Use
FAL - Fish and Aquatic Life Community
Listing Status
TMDL Approved
Attainable Use
FAL - Fish and Aquatic Life Community
Priority
Not Applicable
Designated Use
FAL - Fish and Aquatic Life Community
303(d) ID
399
Listing Date
4/1/1998
Impaired Water Notes
There are many lakes, rivers or streams in the Rock River Basin that are included on the
303(d) List. This effort is focused on those waters that are impaired by either excessive
sediment, high phosphorus concentrations, or both sediment and phosphorus (see Table 1).
These pollutants cause impacts to waterways which include low dissolved oxygen
concentrations, degraded habitat, and excessive turbidity. All of these problems result in
harm to fish and aquatic life, water quality, recreation and even navigation. Everyone who
lives or recreates in the Rock River basin will benefit from the improved water quality that will
result from reduced sediment and phosphorus
Date
12/1/2006

Impaired Water Notes
The Rock River (788800, miles 171.1-304.9) is a part of the Rock River Basin and is listed as impaired for sediment/total suspended solids and total phosphorus. The Rock River Basin TMDLs for phosphorus and sediment were approved by the USEPA September 28, 2011.
Date
5/8/2012

 
Pollutant
PCBs
Listed For
Impairments
PCBs Contaminated Fish Tissue
Current Use
Listing Status
Pollutant Removed
Attainable Use
Priority
Delisted 2006
Designated Use
303(d) ID
399
Listing Date
4/1/1998
Impaired Water Notes
New data removes listing. 399, 400, 401 Rock River Listings-FCA Impairment for PCBs pollutant should be removed. We have new data for Sites (2001/2002 Janesville to Afton, 2002 Indianford to Janesville, and 2003 Lake Koshkonong).
Date
4/1/2008

 
Pollutant
Mercury
Listed For
Impairments
Mercury Contaminated Fish Tissue
Current Use
Listing Status
Pollutant Removed
Attainable Use
Priority
Delisted 2006
Designated Use
303(d) ID
399
Listing Date
4/1/1998
Impaired Water Notes
Delisted in 2006 but not documented until 2008
Date
4/1/2008

 
Pollutant
Sediment/Total Suspended Solids
Listed For
Fish and Aquatic Life
Impairments
Degraded Habitat
Current Use
FAL - Fish and Aquatic Life Community
Listing Status
TMDL Approved
Attainable Use
FAL - Fish and Aquatic Life Community
Priority
Not Applicable
Designated Use
FAL - Fish and Aquatic Life Community
303(d) ID
399
Listing Date
4/1/1998
Impaired Water Notes
There are many lakes, rivers or streams in the Rock River Basin that are included on the
303(d) List. This effort is focused on those waters that are impaired by either excessive
sediment, high phosphorus concentrations, or both sediment and phosphorus (see Table 1).
These pollutants cause impacts to waterways which include low dissolved oxygen
concentrations, degraded habitat, and excessive turbidity. All of these problems result in
harm to fish and aquatic life, water quality, recreation and even navigation. Everyone who
lives or recreates in the Rock River basin will benefit from the improved water quality that will
result from reduced sediment and phosphorus
Date
12/1/2006

Impaired Water Notes
The Rock River (788800, miles 171.1-304.9) is a part of the Rock River Basin and is listed as impaired for sediment/total suspended solids and total phosphorus. The Rock River Basin TMDLs for phosphorus and sediment were approved by the USEPA September 28, 2011.
Date
5/8/2012