ADBNet

Assessment Comments

Monitored by ISU in 1990 for Clean Lakes Classification Study (1994).

Basis for Assessment

Assessment was changed from PS in the 1992 report to FST for the 1994 report for the following reasons:  (1) DNR Fisheries recommended the assessment of FST; (2) results of ISU monitoring in 1990 show that average levels of chl-a, total-P, secchi depth, and TSS are much better than overall averages for the 116 SPOLs sampled in 1990 and 1992.   Bachmann et al.  (1994) state that the lake's estimated winterkill frequency is once in 10 years, thus suggesting a threat to support of fishable uses.   Lake has very high sedimentation rate (7.8 cm/yr) and very short life expectancy (34 years) compared to other SPO impoundments.   Level of swimming use reported by Bachmann et al.  (1994) is relatively high for this small (10.1 acre) SPOL.  High sed.  rate and short life expect suggest an immediate threat from sediment delivered to the lake in ag NPSP.