Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

Mississippi River IA 01-NEM-76

from Lock & Dam 10 at Guttenberg (Clayton Co.) to confluence with Wisconsin R across from McGregor Clayton Co.

Assessment Cycle
2000
Result Period
1996 - 1998
Designations
Assessment Methodology
Assessment Type
Monitored
Integrated Report
Category 0
Legacy ADBCode
IA 01-NEM-0030_2
Overall Use Support
Threatened
Aquatic Life Use Support
Threatened
Fish Consumption
Fully
Primary Contact Recreation
Not assessed
Documentation
Assessment Comments

Assessment based on special study conducted by Wisconsin DNR in summer 1997 and 1998 and on results of U.S. EPA/IDNR fish tissue monitoring in 1994.

Basis for Assessment

SUMMARY:  The Class A (primary contact recreation) uses remain "not assessed."  The Class B(WW) aquatic life uses remain assessed as "fully supporting / threatened."  Fish consumption uses remain assessed as "fully supported."  EXPLANATION:  The Class A uses were not assessed due to lack of information on levels of indicator bacteria in this reach of river.   The Class B(WW) uses remain assessed as "fully supporting / threatened" based on the 1997 study of dissolved oxygen levels by Sullivan and Endris (1998) of the Wisconsin DNR (see assessment for the 1998 report above).   Fish consumption uses remain assessed as "fully supported" based on results of EPA/DNR fish tissue (RAFT) monitoring in 1994 downstream from Guttenberg that showed levels of contaminants in composite samples of fillets from channel catfish and smallmouth bass were less than ½ the respective FDA action levels and DNR levels of concern (see assessment for the 1996 report above).   EPA/DNR fish tissue monitoring was conducted at this site again in 2000; results will not be available until mid-2001.

Monitoring and Methods
Assessment Key Dates
8/3/2000 Fixed Monitoring End Date
8/1/1998 Fixed Monitoring Start Date
Methods
220 Non-fixed station physical/chemical monitoring (conventional pollutant only)
260 Fish tissue analysis
Monitoring Levels
Biological 0
Habitat 0
Physical Chemistry 4
Toxic 0
Pathogen Indicators 0
Other Health Indicators 0
Other Aquatic Life Indicators 0
# of Bio Sites 0
BioIntegrity N/A
Causes and Sources of Impairment
Causes Use Support Cause Magnitude Sources Source Magnitude
Organic enrichment/Low DO Overall Use Support Not Impairing
  • Natural Sources
  • Other
  • Not Impairing
  • Not Impairing