White Fox Creek IA 04-UDM-1261

Assessment Comments

Assessment is based on results of IDNR/UHL biocriteria sampling: Avg.1994 - 1998 Biocriteria scores: Fish IBI=58 (good), BM-IBI=67 (good).

Basis for Assessment

The assessment was based on data from multiple samplings conducted from 1994-1998 as part of the DNR/UHL stream biocriteria project.   A series of biological metrics which reflect stream water quality and habitat integrity were calculated from the biocriteria sampling data.   The biological metrics are based on the numbers and types of benthic macroinvertebrate taxa and fish species that were collected in the stream sampling reach.   The biological metrics were combined to make a fish community index of biotic integrity (F-IBI) and a benthic macroinvertebrate index (BM-IBI).   The indexes rank the biological integrity of a stream sampling reach on a rising scale from 0 (minimum) to 100 (maximum).

The average F-IBI score for the 1994-1998 period was 58 (good) and the average BM-IBI score was 67 (good).   The aquatic life use support was assessed as fully supported / threatened (=FST), based on a comparison of the F-IBI and BM-IBI scores with biological assessment criteria established specifically for the 2000 Section 305(b) report.   The biological assessment criteria were determined from a statistical analysis of data collected at stream ecoregion reference sites from 1994-1998.