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. Assessments prior to 2016 were developed under the previous USPEA guidelines, and have a different format.

Assessment Cycle

2004

Result Period

2000 - 2002

Designations

Assessment Methodology

2004 Methodology Document

Assessment Type

Monitored

Integrated Report

Category 5b

Legacy ADBCode

IA 05-NOD-0100_2

Overall Use Support

Partial

Aquatic Life Use Support

Partial

Documentation

Assessment Comments

Assessment is based on results of IDNR/UHL biological (biocriteria) monitoring in 1998: Fish IBI= 19(poor), BM-IBI= 66(good).

Basis for Assessment

SUMMARY: The Class B(LR) aquatic life uses are assessed (monitored) as "partially supported" based on results of IDNR/UHL biological (biocriteria) sampling in 1998. This is the same assessment as that developed for the 2002 reporting cycle.

EXPLANATION: This 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 F-IBI score was 19 (poor) and the BM-IBI score was 65 (good). 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
8/19/1998	One-time Chemical 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
Cause Unknown	Aquatic Life Support	Moderate	Source Unknown	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	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	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