Rock Creek Lake IA 03-NSK-865

Assessment Comments

Assessment based on results of RAFT monitoring and information from IDNR Fisheries Bureau.

Basis for Assessment

SUMMARY:  The Class A (primary contact recreation) uses were considered "not assessed."  The Class B(LW) aquatic life uses were assessed as "partially supported."  The Class C (drinking water) uses remained "not assessed."  The fish consumption uses were assessed as "fully supported."  EXPLANATION:  The Class A uses were considered "not assessed" due to lack of information on levels of indicator bacteria at this lake.   Based on the recommendation of the DNR Fisheries Bureau, the Class B(LW) uses remained assessed as "partially supported."  The water quality trend for this lake remains "declining."  The Class C uses remained "not assessed" due to a lack of water quality for Class C water quality parameters.   The fish consumption uses were assessed as "fully supported" based on results of fish tissue monitoring conducted in September 1998 as part of the "Rock Creek Lake Restoration Diagnostic / Feasibility Study (Downing et al.  2000).   Analysis of composite samples of fillets from largemouth bass and common carp showed no detectable levels of the 32 organochlorine insecticides and industrical compounds analyzed.