Slip Bluff Lake IA 05-GRA-1362

Assessment Comments

Basis for Assessment

SUMMARY:  The Class A (primary contact recreation) uses remain "not assessed."  The Class B(LW) (aquatic life) uses remain "partially supported."  Fish consumption uses were "not assessed."  EXPLANATION:  The Class A uses remain "not assessed due (1) to the lack of information on levels of indicator bacteria at this lake and (2) presumed lack of swimming uses at this lake (see above).   The Class B(LW) uses remain assessed as "partially supported" due to the chronic turbidity problems at this lake as reported by Bachmann (1994) (see assessment for the 1992-94 reports above).   The previous identification of "siltation and nutrients" as causes of impairment at this lake were based on the generalized assessment approach for all Iowa waterbodies used for Iowa's 1992 305(b) report.   The lake-specific information on chronic turbidity and its causes (suspended clays / soil type) from Bachmann et al.  (1994) is more appropriate for the identification of causes and sources of impairment at this lake.   Fish consumption uses were not assessed due to the lack of fish contaminant monitoring at this lake.