West Nodaway River IA 05-NOD-1409

from confluence with Threemile Cr. (S35 T74N R36W Cass Co.) to confluence with Whislers Branch in S17 T74N R35W Cass Co.

This is a Legacy Assessment. Prior to 2004, assessments were developed under a methodology that pre-dated the Integrated Report guidelines.

Assessment Cycle

2002

Result Period

1998 - 2000

Designations

Assessment Methodology

2002 Methodology Document

Assessment Type

Monitored

Integrated Report

Category 0

Legacy ADBCode

IA 05-NOD-0100_2

Overall Use Support

Partial

Aquatic Life Use Support

Partial

Documentation

Assessment Comments

1998 Biocriteria: Fish IBI= 19(poor), BM-IBI= 66(good).

Basis for Assessment

The assessment was based on the 1998 biological assessment data (see 2000 assessment comments), and the aquatic life use support continued to be assessed as partially supporting (=PS), based on a comparison of the F-IBI and BM-IBI scores with biological assessment criteria established specifically for the 2002 Section 305(b) report. The biological assessment criteria were determined from a statistical analysis of data collected at stream ecoregion reference sites from 1994-2001.

Monitoring and Methods

Assessment Key Dates

8/19/1998	Biological Monitoring

Methods

330	Fish surveys
380	Quan. measurements of instream parms-- channel morphology-- floodplain-- 1-2 seasons-- by prof
220	Non-fixed station physical/chemical monitoring (conventional pollutant only)
315	Regional reference site approach
320	Benthic macroinvertebrate surveys

Monitoring Levels

Biological	4
Habitat	4
Physical Chemistry	1
Toxic	0
Pathogen Indicators	0
Other Health Indicators	0
Other Aquatic Life Indicators	0
# of Bio Sites	1
BioIntegrity	Poor

Causes and Sources of Impairment

Causes	Use Support	Cause Magnitude	Sources	Source Magnitude
Other habitat alterations	Overall Use Support	Moderate	Bank or Shoreline Modification/Destabilization Channelization Grazing related Sources Habitat Modification (other than Hydromodification) Hydromodification Pasture grazing - Riparian	Moderate Moderate Moderate Moderate Moderate Moderate
Other habitat alterations	Aquatic Life Support	Moderate	Bank or Shoreline Modification/Destabilization Channelization Grazing related Sources Habitat Modification (other than Hydromodification) Hydromodification Pasture grazing - Riparian	Moderate Moderate Moderate Moderate Moderate Moderate
Siltation	Overall Use Support	Moderate	Agriculture Bank or Shoreline Modification/Destabilization Channelization Grazing related Sources Habitat Modification (other than Hydromodification) Hydromodification Pasture grazing - Riparian	Moderate Moderate Moderate Moderate Moderate Moderate Moderate
Siltation	Aquatic Life Support	Moderate	Agriculture Bank or Shoreline Modification/Destabilization Channelization Grazing related Sources Habitat Modification (other than Hydromodification) Hydromodification Pasture grazing - Riparian	Moderate Moderate Moderate Moderate Moderate Moderate Moderate
Turbidity	Overall Use Support	Moderate	Agriculture Bank or Shoreline Modification/Destabilization Channelization Grazing related Sources Habitat Modification (other than Hydromodification) Hydromodification Pasture grazing - Riparian	Moderate Moderate Moderate Moderate Moderate Moderate Moderate
Turbidity	Aquatic Life Support	Moderate	Agriculture Bank or Shoreline Modification/Destabilization Channelization Grazing related Sources Habitat Modification (other than Hydromodification) Hydromodification Pasture grazing - Riparian	Moderate Moderate Moderate Moderate Moderate Moderate Moderate