West Lake (Osceola) IA 04-LDM-1082

Clarke County S13T72NR26W approx 2 mi W of Osceola.

This is a Legacy Assessment. Prior to 2004, assessments were developed under a methodology that pre-dated the Integrated Report guidelines.

Assessment Cycle

1994

Result Period

1990 - 1992

Designations

Assessment Type

Monitored

Integrated Report

Category 0

Legacy ADBCode

IA 04-LDM-02690-L_0

Overall Use Support

Threatened

Aquatic Life Use Support

Threatened

Fish Consumption

Not assessed

Drinking Water

Not assessed

Documentation

Assessment Comments

Basis for Assessment

Results of ISU monitoring in 1992 show that the average level of secchi depth is at the overall mean for the 116 SPOLs sampled in 1990 and 1992; that average levels of chl-a and total-P are better than overall means but are within 1 SD better than the overall means. Thus, these data suggest that the lake has better than average water quality for Iowa SPOLs. Both sed rate & life expect are much better than average for SPO impoundments. Mon. in 90 by Miller & Kennedy (1991: 56) showed that levels of atrazine and alachlor exceeded MCLs; thus lake was assessed as PS in 92. Winter sampling of WS res. in 93 showed that levels of pests in water were << MCLs, but that levels in sediment near the dam were rel. high (Miller & Kennedy 1993: 52). Monitoring in March 1992 also showed levels of atrazine & alachlor < MCLs. Mon by DuPont in 1993 showed return of high levels of atrazine & cyanazine; activated charcoal filter installed at WTP.