Iowa DNR

Water Quality Assessments

Impaired Waters List

Nishnabotna River IA 05-NSH-1412

IA/MO line to (S26 T67NR42W Fremont Co.) to confluence of E. Nishnabotna and W. Nishnabotna rivers in S2 T67N R42W Fremont Co.

Assessment Cycle
Result Period
2000 - 2002
Assessment Methodology
Assessment Type
Integrated Report
Category 2a
Legacy ADBCode
IA 05-NSH-0010_0
Overall Use Support
Aquatic Life Use Support
Not assessed
Fish Consumption
Assessment Comments

Assessment is based on results of U.S. EPA/IDNR fish tissue (RAFT) monitoring in 2002.

Basis for Assessment

SUMMARY:  The Class B(WW) aquatic life uses remain "not assessed."  Fish consumption uses are assessed (monitored) as "fully supported" based on results of U.S.  EPA / IDNR fish contaminant (RAFT) monitoring in 2002.  

EXPLANATION:  The Class B(WW) uses remain "not assessed" due to the lack of water quality data or other water quality information upon which to base an assessment (see assessment for the 2000 report).   Fish consumption uses are assessed as "fully supported" based on results of the U.S.  EPA/IDNR fish tissue (RAFT) monitoring near Hamburg in 2002.   The composite samples of fillets from common carp from this site had very low levels of contaminants (a predator species was not available at this site).   Levels of contaminants in this sample did not approach even one-half the respective FDA action levels or IDNR levels of concern.   Levels of primary contaminants in the composite sample of common carp fillets were as follows: mercury: 0.085 ppm; total PCBs: <0.093 ppm; and technical chlordane: 0.030 ppm.

Monitoring and Methods
Assessment Key Dates
9/9/2002 Fish Tissue Monitoring
260 Fish tissue analysis
Monitoring Levels
Biological 0
Habitat 0
Physical Chemistry 0
Toxic 0
Pathogen Indicators 0
Other Health Indicators 0
Other Aquatic Life Indicators 0
# of Bio Sites 0
BioIntegrity N/A