Maple River IA 06-LSR-1585

from confluence with Odebolt Cr. (NE 1/4 S15 T87N R40W Ida Co.) to confluence with Silver Cr. in S13 T88N R40W Ida 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 2a

Legacy ADBCode

IA 06-LSR-0080_1

Overall Use Support

Threatened

Aquatic Life Use Support

Threatened

Fish Consumption

Not assessed

Documentation

Assessment Comments

Assessment is based on results of IDNR/UHL biological (biocriteria) monitoring in 1997: Fish IBI= 38(fair); BM-IBI (2 sites) = 69(good) 66(good).

Basis for Assessment

SUMMARY: The Class B(WW) aquatic life uses are assessed (monitored) as "fully supported / threatened" (minor impacts) based on results of IDNR/UHL biological (biocriteria) sampling in 1997. Fish consumption uses remain "not assessed" due to the lack of fish contaminant monitoring in this stream segment. This is the same assessment as that developed for the 2002 reporting cycle.

EXPLANATION: The Class B(WW) aquatic life uses remain assessed as "fully supported / threatened" based on results of the biological assessmentconducted by IDNR/UHL on this stream segment in 1997 (see assessment developed for the 2000 reporting cycle for more information). These data are less than five years old and, according to IDNR's methodology for Section 305(b) assessments, are thus appropriate for characterizing current water quality conditions.

Fish consumption uses remain "not assessed" due to the lack of fish contaminant monitoring in this river segment.

Monitoring and Methods

Assessment Key Dates

8/14/1997	Biological Monitoring
8/14/1997	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	Fair

Causes and Sources of Impairment

Causes	Use Support	Cause Magnitude	Sources	Source Magnitude
Other habitat alterations	Aquatic Life Support	Not Impairing	Bank or Shoreline Modification/Destabilization Habitat Modification (other than Hydromodification)	Not Impairing Not Impairing