Lake Darling IA 03-SKU-924

Washington County S21T74NR9W 3 mi W of Brighton.

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

Hypereutrophic

Trend

Stable

Legacy ADBCode

IA 03-SKU-01450-L_0

Overall Use Support

Partial

Aquatic Life Use Support

Partial

Fish Consumption

Fully

Primary Contact Recreation

Partial

Drinking Water

Not assessed

Documentation

Assessment Comments

Basis for Assessment

Both fishable and swimmable uses were assessed as PS for the following reasons: (1) BPJ of DNR Fisheries; (2) average levels of secchi depth, total-P, and TSS were worse than overall averages for the 86 SPO impoundments sampled in 1990 and 1992; averages of total-P and TSS were worse than the overall average + 1 SD and were some of the highest averages for the 116 SPOLs sampled; these data suggest a WQ impairment due to ag. NPSP; (3) data in Bachmann et al. (1994) show that the lake supports relatively low amounts of fishing and swimming; (4) lake does not have problems with fishkills; (5) lake has a typical sedimentat. rate (2.2 cm/yr) and life expectancy (119 years) for a SPO impoundment in Iowa. According to DNR/Iowa Conservationist fishing forecast for 1994, lake is good for ccat, crappie, LMB, and carp, and bullhead. Levels of fish contams < 1/2 FDA action levels.