Swan Lake IA 04-RAC-1199

Assessment Comments

Basis for Assessment

Assessment for the 1992 report (FS) changed to PS for the 1994 report for the following reasons:  (1) results of CLP monitoring show that lake has relatively high levels of bacteria and nutrients due to improper waste management and due to wildlife pens near the park; (2) data from ISU monitoring in 1990 show that average levels of chl-a and total-P are worse than the overall means +/- 1 SD for the 116 SPOLs sampled in 1990 and 1992; average for TSS is at upper bound of overall mean + 1 SD.  These data suggest organic enrichment of the lake; (3) personal communications with staff of CCCB and DNR Fisheries Bureau that suggest impairments to swimming uses due to algal scums and that the large population of carp in the lake (cause 2600) is recycling nutrients and exacerbating existing problems with WQ and the quality of the fishery.