Lake Macbride IA 02-IOW-629

Johnson County S29T81NR6W 4 mi. W of Solon.

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

Trophic

Eutrophic

Trend

Stable

Legacy ADBCode

IA 02-IOW-00390-L_0

Overall Use Support

Threatened

Aquatic Life Use Support

Threatened

Fish Consumption

Not assessed

Primary Contact Recreation

Threatened

Documentation

Assessment Comments

Assessment is based onsurveys by IDNR Fisheries Bureau.

Basis for Assessment

Both fishable and swimmable uses were assessed as FST for the following reasons: (1) results of monitoring in 1990 show that average levels of secchi depth, chl-a, total-P, and TSS were approximately equal to, or better than, overall averages for the 116 SPOLs sampled in 1990 and 1992; (3) accord. to Bachmann et al. (1994), the lake has a relatively low sedimentation rate (1.0 cm/yr) and a relatively long life expectancy (486 years); they also report relatively high amounts of use for both fishing and swimming; fishkills are not a problem and "nuisance algal blooms are minimal." Uses are threatened by agricultural runoff and by treated wastewater from Solon via Mill Creek. According to DNR Fisheries, lake is impaired by rough fish that gain access to lake during high water in Coralville Reservoir. DSC (1991) suggest threats from nonpoint source pollution in both arms.