Lost Island Lake IA 06-LSR-1632

Assessment Comments

Monitored in 1990 by ISU as part of the Clean Lakes Classification Study (1994).

Basis for Assessment

Both fishable and swimmable uses were assessed as FST for the 1992 report  for the following reasons: (1) BPJ of DNR Fisheries; (2) results on monitoring show that average levels of secchi depth, chl-a, and TSS are approx equal to or better than overall averages for the 116 SPOLs sampled in 1990 and 1992; the level of total-P, however, was worse than the overall average and approached the overall mean + 1 SD; (3) levels of use for fishing and swimming reported by Bachmann et al.  (1994) are relatively high; (4) fishkills are reported as "infrequent"; (5) lake has a relatively low sedimentation rate (0.3 cm/yr) and a long life expectancy (1075 years).   Thus, lake has relatively good water quality for a shallow natural lake and supports both fishing and swimming.   Lake is threatened by resuspension of sediment and nutrients through wave action and by nuisance aquatic vegetation typical of shallow lakes.