Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

Missouri River IA 06-WEM-1715

from confluence with Boyer R. (Pottawattamie Co.) to confluence with Little Sioux R. at river mile 669.2 in Harrison Co.

Assessment Cycle
2002
Result Period
1998 - 2000
Designations
Assessment Methodology
Assessment Type
Evaluated
Integrated Report
Category 0
Legacy ADBCode
IA 06-WEM-0030_0
Overall Use Support
Partial
Aquatic Life Use Support
Partial
Fish Consumption
Fully
Primary Contact Recreation
Not assessed
Documentation
Assessment Comments

Assessment is based on (1) surveys of Nebraska fisheries biologists, (2) consultation with DNR staff and (3) results of fish tissue (RAFT) monitoring near Little Sioux in 1997.

Basis for Assessment

SUMMARY:  The Class A (primary contact recreation) uses remain "not assessed."  The Class B(WW) aquatic life uses remain assessed as "partially supported."  The fish consumption uses are assessed as "fully supported."  EXPLANATION:  The Class A uses remain "not assessed" due to the lack of monitoring data for indicator bacteria for this reach of the Missouri River.   The Class B(WW) uses remain assessed as "partially supported" based on the assessment developed for the 1998 and 2000 reports (i.e., habitat alterations and flow modifications that resulted from development of the river  for navigation uses in the mid-Twentieth Century).   This assessment was developed in consultation with the Missouri River fisheries biologist for the state of Nebraska.   Fish consumption uses remain assessed as "fully supported" based on EPA/DNR fish tissue (RAFT) monitoring near Little Sioux in Harrison County in 1997 (see assessment for the 2000 report).

Monitoring and Methods
Assessment Key Dates
9/1/1997 Fish Tissue Monitoring
Methods
120 Surveys of fish and game biologists/other professionals
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
Causes and Sources of Impairment
Causes Use Support Cause Magnitude Sources Source Magnitude
Flow alteration Overall Use Support Moderate
  • Flow Regulation/Modification
  • Moderate
Flow alteration Aquatic Life Support Moderate
  • Flow Regulation/Modification
  • Moderate
Other habitat alterations Overall Use Support Moderate
  • Channelization
  • Moderate
Other habitat alterations Aquatic Life Support Moderate
  • Channelization
  • Moderate