Crawford Creek Impoundment IA 06-LSR-1583

Assessment Comments

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

Basis for Assessment

Both uses were assessed as FST for the following reasons:  (1) BPJ of DNR Fisheries; (2) results of monitoring in 1990 show that averages of secchi depth, chl-a, total-P, and TSS are better than overall averages for the 116 SPOLs sampled in 1990 and 1992; (3) according to Bachmann et al.  (1994), the lake does not have problems with fishkills and supports a relatively large amount of fishing; (4) lake has a moderately high sedimenation rate (3.4 cm/yr) and a moderately long life expectancy for an impoundment (102 years); DSC (1991) reports that (1) fishery surveys in 1987 and 1990 indicate an excellent fish population, (2) recreational uses of the lake were not impaired by NPSP, and (3) no major changes in WQ occurred between 1979 and 1987.