Coldwater Creek IA 01-UIA-280

Assessment Comments

Assessment is based on results of IDNR/UHL biological (biocreteria) monitoring in 2001: 6/8 coldwater biological indicators met the criteria - Fully Supporting / Threatened (FS/T).

Basis for Assessment

SUMMARY:  The Class B(CW) coldwater aquatic life uses remaini assessed (monitored) as "fully supported / threatened" based on results of IDNR/UHL biological (biocriteria) monitoring in 2001.   Fish consumption uses remain "not assessed" due to the lack of fish contaminant monitoring in this stream segment.    

EXPLANATION:  The assessment of the Class B(CW) coldwater aquatic life uses was based on data collected in 2001 as part of the DNR/UHL stream biocriteria project.   A series of eight (8) Coldwater biological indicators, which reflect stream water quality and habitat integrity, were calculated from the biocriteria sampling data and supplemental IDNR Fisheries Bureau data.   The coldwater biological indicators are based on the numbers and types of coldwater benthic macroinvertebrate taxa and fish species that were collected in the stream sampling reach.   Sites that score 7 or 8 are Fully Supporting (FS), sites that score 4-6 are Fully Supporting/Threatened (FS/T), sites that score 2-3 are Partially Supporting (PS), and sites that score 0-1 are Not Supporting (NS).   The 2001 coldwater biological indicator score was 6/8.   The aquatic life use support was assessed as Fully Supporting/Threatened (=FS/T), based on a comparison of the coldwater biological indicator score with biological assessment criteria established for this Section 305(b) report.   The coldwater biological indicators were determined from a statistical analysis of data collected at coldwater stream ecoregion reference sites from 1994-2002 and with assistance from the IDNR Fisheries Bureau.

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