Little Fox River IA 04-FOX-996

Assessment Comments

Assessment is based on results of UGSG water quality monitoring in 1998 and 1999 near Cantril.

Basis for Assessment

SUMMARY:  The general aquatic life uses were assessed as "fully supported."  EXPLANATION: Results of chemical water quality monitoring conducted by the U.S.  Geological Survey in 1998 and 1999 at the Iowa / Missouri state line south of Cantril Van Buren County) were used to develop the current assessment of support of the general aquatic life uses.   This USGS monitoring showed no violations of Class B(LR) water quality criteria for dissolved oxygen, pH, and ammonia-nitrogen in the 13 samples collected.   None of the nine samples analyzed contained toxic metals above Class B(LR) chronic criteria.    Although not designated for Class C (drinking water) uses, four of the 11 samples from this station analyzed for pesticides during the 1998-1999 period exceeded the U.S.  EPA MCL of 3.0 ug/l.   None of the 13 samples analyzed exceeded the nitrate MCL of 10.0 mg/l.   Thus, based on results of chemical water quality monitoring 1998-1999 biennial period, the general aquatic life uses of this stream reach are assessed as "fully supported."  Biological monitoring is needed to determine the status of the aquatic communities of this stream reach.