Yellow Smoke Park Lake IA 06-BOY-1514

Assessment Comments

Monitored in 1992 by ISU as part of Clean Lakes Classification Study (1994).

Basis for Assessment

Assessment not changed from PS in the 1992 report for the 1994 report for the following reasons*:  (1) results of ISU monitoring in 1992 show that average levels of secchi depth, chl-a, total-P, and TSS are much better than overall averages for the 116 SPOLs sampled in 1990 and 1992; (2) winterkill frequency for the lake is estimated to be zero (Bachmann et al.  (1994); (3) level of use for swimming reported by Bachmann et al.  in highest 10% of the 61 SPO impoundments with levels of swimmimg use > zero.   Lake has relatively high sedimentation rate (5.2 cm/yr) and relatively short life expectancy (66 years), thus suggesting an immediate threat to support of uses from sediment delivered to the lake in agricultural NPS pollution.   *DNR Fisheries believes that lake is impacted by siltation from AG NPS; thus, despite > average WQ, assessed as PS.