Little Wall Lake IA 03-SSK-941

Hamilton County S10T86NR24W 1 mi. S of Jewell

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 03-SSK-00360-L_0

Overall Use Support

Partial

Aquatic Life Use Support

Partial

Fish Consumption

Fully

Primary Contact Recreation

Partial

Documentation

Assessment Comments

Basis for Assessment

Used assessments were used from the 1992 report for the following reasons: (1) BPJ of DNR Fisheries; (2) Bachmann et al. (1994) report that approx. 80% of the lake is covered by submergent aquatic vegetation; this vegetation could interfere with both fishable and swimmable uses. Monitoring in 1990 suggests that lake water quality is above average for Iowa SPOLS: averages of secchi depth, TSS, and chl-a are better than overall averages for the 116 SPOLs sampled in 1990 and 1992; averages of total-P are within 1 SD (on the poor side) of the overall mean. This natural lake has a very low sedimentation rate (0.1 cm/yr) and thus has a very long life expectancy (876 years). Aquatic vegetation, either planktonic or vascular, impairs uses designated for this lake. Results for fish contam in bullheads all < 1/2 FDA action levels.