North Twin Lake IA 04-RAC-1167

Assessment Comments

Basis for Assessment

The Class A (primary contact recreation) uses and the Class B(LW) aquatic life uses remain assessed as "partially supported."  Fish consumption uses were "not assessed."  EXPLANATION:  The Class A uses were assessed as "partially supported" based on (1) previous assessments (see above) and (2) information from the public in 1999 suggesting that cyanotoxicity in this lake may be a problem.   The possiblity of cyanotoxicity at this  lake needs to be investigated; the assessment of the Class A uses as "partially supported" is intended to highlight this potential impairment.   The Class B(LW) uses remain assessed as "partially supported" based on the review and approval of the previous (1998) assessment by the DNR Fisheries Bureau in 2000.   Fish consumption uses were "not assessed" due to the lack of recent fish contaminant monitoring at this lake.   The most recent fish contaminant monitoring was conducted for the 1991 DNR/EPA fish tissue (RAFT) program.   The results from the monitoring are considered too old (greater than five years) for characterizing current conditions.