Cedar River IA 02-CED-455

from Prairie Cr. (SE 1/4 S34 T83N R7W Linn Co.) to confluence with McCloud Run in SW 1/4 S16 T83N R7W Linn Co.

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

Assessment Cycle

1996

Result Period

1992 - 1994

Designations

Assessment Type

Monitored

Integrated Report

Category 0

Legacy ADBCode

IA 02-CED-0030_1

Overall Use Support

Partial

Aquatic Life Use Support

Threatened

Fish Consumption

Not assessed

Primary Contact Recreation

Partial

Drinking Water

Not assessed

Documentation

Assessment Comments

(All 21 IOWA/DNR): 324035, 324030, 324028, 324015: (stations monitord for UI contract with DAEC.)

Basis for Assessment

At the four stations in this reach monitored through DAEC, no violations of DO/pH in 191 samples over the 2- year period, and 1 violation (60 ug/l) of the chronic WQC for copper in 16 samples. Of the 191 samples analyzed for fecals, 104 were collected during April-October; 72 were collected at approx average flows, and 28 samples contained > 200 orgs/100ml =39% of samples in violation of WQC. Based on lack of reports of waterborne diseases, and based on problems with use of fecal coliforms as indicators, use BPJ to assess primary contact uses as PS (same as in 1994). Of the 72 samples analyzed for NO3 at Station 324035 (John Comp farm) from October 1992 through Sept. 1995, none exceed the MCL of 10 mg/l. Based on likely natural sources of copper in Iowa rivers, and based on 305(b) methods, no impairment due to toxic metals.