Iowa River IA 02-IOW-627

from confluence with English R. (Washington Co.) to Burlington Street Dam in Iowa City (Johnson 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

Evaluated

Integrated Report

Category 0

Legacy ADBCode

IA 02-IOW-0030_1

Overall Use Support

Threatened

Aquatic Life Use Support

Not assessed

Fish Consumption

Threatened

Primary Contact Recreation

Not assessed

Documentation

Assessment Comments

Assessment is based on results of fish tissue (RAFT) monitoring.

Basis for Assessment

Used results of special study of chlordane in fish and of 1994 RAFT sampling at Iowa City and Hills to assess support of fish consumption uses as FST due to (1) levels of chlordane in carp fillets at all 4 DNR sites > 1/2 FDA AL; (2) level of chlordane in 1 of 2 94 samples from Hills > FDA act. level, (3) level of chlordane in 94 RAFT sample of CCAT fillets from Iowa City > 1/2 FDA action level, (4) levels of chlordane < 1/2 FDA AL in 95 RAFT carp fillet sample from Iowa City; > 1/2 FDA AL at Hills in carp fillet sample (0.21 ppm). Thus, appears that levels of chlordane in carp/channel catfish may have leveled and continue to decline. RAFT sampling will continue at Iowa City and Hills.