Nine Eagles Lake IA 05-GRA-1361

Assessment Comments

Basis for Assessment

Assessment in the 1992 report (PS) NOT CHANGED for the 94 report upon recommend of DNR Fisheries (gully eros./turbidity problems).  Mon in 1990 shows that avg levs of secchi depth, total-P, chl-a, and TSS are at or better than overall averages for the 116 SPOLs sampled in 1990 and 1992, (2) DNR Fisheries assessed the lake as FST, (3) lake does not have problems with fishkills, (4) 100% of watershed in approved SC practices, (5) relatively low sedimentation rate (2.1 cm/yr) and relatively long estimated life (204 years) for SPO impoundments in Iowa; (6) levels of use for fishing and swimming reported by Bachmann et al.  (1994) are typical for SPO impoundments.   DSC (1991) reports that parkland covers approx 90% of the WS, with only 0.7% classified as crop- land; thus, sedimentation rate is very low; problem with gully erosion controlled w/ sedimentation dikes.   Experimental destrat in alt years has improved year class strength and fishing success.