Red Rock Reservoir IA 04-LDM-1017

Assessment Comments

Basis for Assessment

Only 1 of 54 samples from North Overlook and Whitebreast beaches exceeded the Class A WQC of 200 orgs/100 ml (=FS).   None of the 34 samples collected from near the dam exceeded Class B(WW) aquatic life water quality criteira (=FS).  Levels of organochlorine contaminants and mercury in composite samples of carp fillets were well-below FDA action levels in 1994 and 1995, thus suggesting that fish consumption uses are fully supported.   None of the 15 samples collected from near the dam and analyzed for fecal coliform bacteria exceeded the Class A water quality criterion (=FS).   Despite excellent water quality, this reservoir continues to suffer from excessive siltation in the upper reaches; thus, assess support of the Class B(WW) aquatic life uses as PS due to siltation.