Mossy Glen Creek IA 01-VOL-302

Assessment Comments

Assessment based on 2004 UHL special stream project sampling data: 6/8 coldwater biological indicators met the criteria - Fully Supporting (FS).

Basis for Assessment

SUMMARY:  The Class B(CW) coldwater aquatic life uses are assessed (monitored) as "fully supported” based on 2004 UHL special biological sampling and information (updated 2006) on trout reproduction in NE Iowa coldwater streams provided by IDNR Fisheries Bureau.   Fish consumption uses remain "not assessed."  

EXPLANATION:  The assessment of the Class B(CW) aquatic life uses was based on data collected in 2004 as part of the DNR/UHL stream REMAP project.   A series of eight (8) coldwater biological indicators, which reflect stream water quality and habitat integrity, were calculated from the biocriteria sampling data.   The coldwater biological indicators are based on the numbers and types of fish species and coldwater benthic macroinvertebrate taxa that were collected in the stream sampling reach.   Sites that score 5-8 are Fully Supporting (FS), sites that score 2-4 are Partially Supporting (PS), and sites that score 0-1 are Not Supporting (NS).   The 2004 coldwater biological indicator score was 6/8.   The aquatic life use support was assessed (monitored) as fully supporting (= FS), 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 1994-2004 and with assistance from the IDNR Fisheries Bureau.

Fish consumption uses remain "not assessed" due to lack of fish tissue monitoring in this stream reach.