Indian Lake IA 04-LDM-1007

Assessment Comments

Assessment is based on results of (1) lake monitoring and (2) surveys by IDNR Fisheries Bureau.

Basis for Assessment

Both fishable and swimmable uses were assessed as PS for the following reasons:  (1) BPJ of DNR staff; (2) results of monitoring show that average levels of TSS and secchi depth are approx equal to, or better than, overall averages for the 86 SPO impoundments sampled in 1990 and 1992; average levels of chl-a and total-P, however, are worse than the overall averages but are within +/- 1 SD; (3) lake either winterkills or summerkills in one of every 10 years; (4) Bachmann et al.  (1994) report that "aquatic plant problems and nuisance algal blooms are common" at the lake.   Lake has very low sedimentation rate (1.1 cm/yr) and rel long life expectancy (139 years) for a small (59 acre) impoundment; in addition, WQ is average to below average, but well within the range expected for SPO impoundments in Iowa.   Assessment based on fishkill frequency and statements regarding nuisance plants.