Ingham Lake IA 04-UDM-1303

Assessment Comments

Basis for Assessment

Aquatic life (Class B) uses remained FST, but swimmable (Class A) use was assessed as PS for the following reasons: results of monitoring in 1990 show that averages secchi depth, chl-a, and TSS are at, or worse than, the overall averages for the 116 SPOLs sampled in 1990 and 1992 +/- 1 SD; in addition, the average level of total-P is worse than the overall average of the 116 SPOLs.   These data suggest that the lake has a problem with high levels sed & nutrients.   The lack of major inflows and the lack of complete stratification in summer suggest that the lake is susceptible to wind-related suspension of sediment & nutrients.   The low fishkill frequency ("rare if ever") (Bachmann et al.  1994) and moderately high levels of fishing use suggest that fishable uses are supported.   Lake is recommend.  for crappie fishing in DNR 1994 fishing forecast.