Iowa DNR

Water Quality Assessments

Impaired Waters List

Thompson River IA 05-GRA-1351

from the Iowa/Missouri state line to confluence with Long Cr. in SW 1/4, S8, T69N, R26W, Decatur Co.

Assessment Cycle
Release Status
Result Period
1990 - 1992
Assessment Type
Integrated Report
Category 0
Legacy ADBCode
IA 05-GRA-0040_0
Overall Use Support
Aquatic Life Use Support
Fish Consumption
Not assessed
Assessment Comments

Stream use assessment in 1991.

Basis for Assessment

Stream assessment forms indicate better than average habitat.  A moderate diversity of habitat provided by riffles, woody debris, and deep water habitat.   Good flow to support game fish pop.  and diversity of nongame species.   Good diversity of fish found at one location.   Size of stream may have hindered sampling effectiveness at other location where fewer types and numbers of fish were observed.

Monitoring and Methods
Assessment Key Dates
7/1/1991 DNR Stream Use Assessment
330 Fish surveys
375 Visual observation-- may not quantify some parameters-- single season-- by prof.
Monitoring Levels
Biological 3
Habitat 3
Physical Chemistry 0
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