Assessment Comments

Basis for Assessment

Had no violations of Class B(WW) WQ criteria for either conventional or toxic pollutants in the 24 samples collected during the October 1995 to September 1997 period.   Thus, based on results of previous (1990) bioassesments and the lack of violations of WQ criteria, assess support of the Class B(WW) aquatic life uses as FST.   Used results of fish tissue monitoring conducted for the USGS National Water Quality Assessment (NAWQA) program in September 1995 to develop an assessment of support of fish consumption uses.   The composite sample of whole-fish carp was analyzed for several organochlorine compounds, including chlordane, dieldrin, DDT, and PCBs.   Levels of all contaminants were much less than 1/2 of the respective FDA action levels, and levels of contaminants at this site were near the lowest of any of the 16 locations sampled for this study.   Thus, assess support of the fish consumption use as fully supporting (FS).   For more information on the USGS fish tissue study, see USGS Fact Sheet FS-027-97 (March 1997).   A review of the field sheet from the October 1990 DNR stream use assessment shows a moderately diverse fish community of 11 species from 7 families, presence of a majority of the expected fish taxa (6 of 8) for streams in the Central Irregular Plains ecoregion (40), and presence of the expected game fish species (channel catfish).   Three size groups of channel catfish were collected:  9-10" TL; 4-5" TL, and 2-3" TL.   This review supports the FST use assessment.   No threats idenfitied on sheet.