Des Moines River IA 04-LDM-1010

from confluence with Soap Cr. (S35 T71NR12W Wapello Co.) to lowhead dam at Ottumwa in S24 T72N R14W Wapello Co.

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

Assessment Cycle

1998

Result Period

1994 - 1996

Designations

Assessment Type

Monitored

Integrated Report

Category 0

Legacy ADBCode

IA 04-LDM-0020_1

Overall Use Support

Partial

Aquatic Life Use Support

Not assessed

Fish Consumption

Threatened

Primary Contact Recreation

Partial

Documentation

Assessment Comments

Basis for Assessment

Changed the assessment of the Class B(WW) aquatic life uses to "not assessed" due to lack of either chemical or biological WQ information from this river reach. Continue to use the assessment from the 1996 report that the Class A uses are likely only partially supported due to combined sewer overflows. Results of fish tissue sampling near Cliffland in August 1997 for the DNR/U.S. EPA RAFT program showed levels of all contaminants to be less than 1/2 of FDA action levels in the composite sample of sauger fillets. Levels of all contaminants execept technical chlordane were less than 1/2 the FDA action level in the composite sample of carp fillets. The level of technical chlordane was 0.22 ppm; this exceeds one-half the FDA action level of 0.30 ppm.; thus, assess support of fish consumption uses as FST. This site will be placed on an every-other-year RAFT monitoring schedule due to the level of technical chlordane and due to high levels of chlordane found downstream from Ottumwa in the late 1980s.