Don Williams Lake IA 04-UDM-1249

Assessment Comments

Basis for Assessment

Continued to uses assessments of the support of the Class B(LW) aquatic life uses developed for the 1994 & 96 reports (=PS).   Continued to assess support of Class A primary contact recreation uses as FST due to levels of swimming use from Bachmann et al.  (1994); however, no data for pH or fecal bacteria) at this lake.   Fish consumption uses were assessed as FS due to results of sampling for the 1996 Regional Ambient Fish Tissue Monitoring (RAFT) Monitoring Program that showed levels of contaminants in the composite samples of fillets from channel catfish and largemouth bass were below 1/2 of the respective FDA action levels.   This lake was placed on Iowa's 1998 Section 303(d) list of impaired waters due to water quality impairments from organic enrichment related to municipal point sources and from siltation due to nonpoint source delivery of silt to the lake from its watershed.   The assessment of the Class B(LW) uses were reviewed and approved by the DNR Fisheries Bureau.