Iowa DNR
ADBNet

Water Quality Assessments

Impaired Waters List

Wapsipinicon River IA 01-WPS-342

from Pine Cr. (S28 T88N R8W Buchanan Co.) to confluence with Harter Cr. at Independence in NW 1/4 S34 T89N R9W Buchanan Co.

Assessment Cycle
2018
Release Status
Final
Cycle Period
2014 - 2016
Overall IR Category
2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
Trend
Unknown
Created
5/20/2019 10:29:00 AM
Updated
8/1/2019 1:50:15 PM
Assessment conducted in accordance with Iowa's 2018 IR methodology
Use Support
Class A1
Not Assessed
Class BWW1
Not Assessed
Class HH
Fully Supported
General Use
Not Assessed
Impairment Delistings
No delistings for this assessment cycle.
Documentation
Assessment Summary

The Class A1 (primary contact recreation) uses are changed to not assessed based on the age of the data.  The Class B(WW1) aquatic life uses are changed to not assessed based on the age of the data.  Fish consumption uses are assessed (monitored) as "fully supported" based on results of U.S. EPA/DNR fish contaminant monitoring in 2011.  The sources of data for this assessment include (1) results of EPA/DNR fish tissue (RAFT) monitoring in 2011 approximately 1 mile southeast of Independence.  (Note:  routine ambient monitoring at DNR/SHL station 10100002 downstream from Independence was discontinued in 2006.)

Assessment Explanation

The Class A1 (primary contact recreation) uses is changed to not assessed based on the age of the data.

The Class B(WW1) aquatic life uses are changed to not assessed based on the age of the data.

The occurrence of a fish kill in this river segment late August 2005, however, suggests that the Class B(WW1) uses of this river segment should be assessed (evaluated) as potentially impaired.However, according to DNR’s assessment/listing methodology, any IR 2b or 3b fish kills that occurred more than 10 years ago will be moved to IR Category 3a (not assessed). Because the 2005 fish kill on this segment is now more than 10 years old, the potential (3b) impairment is removed for the current (2018) IR cycle.


Fish consumption uses are assessed (monitored) as “fully supported” based on results of U.S.EPA/DNR fish contaminant (RAFT) monitoring downstream from Independence in 2011. The composite samples of fillets from channel catfish and smallmouth bass had low levels of contaminants. The composite sample of fillets from channel catfish and the tissue plug samples from smallmouth bass had low levels of contaminants. Levels of primary contaminants in the composite sample of fillets from channel catfish were as follows: mercury: 0.067 ppm; total PCBs: <0.09 ppm; and technical chlordane: <0.031 ppm. The average level of mercury in the tissue plug samples from five smallmouth bass was 0.245 ppm (standard deviation = 0.024 ppm; maximum =0.281 ppm). The existence of, or potential for, a fish consumption advisory is the basis for Section 305(b) assessments of the degree to which Iowa’s lakes and rivers support their fish consumption uses. The levels of contaminants in the samples from this assessment segment analyzed for the 2011 RAFT program do not exceed any of Iowa’s consumption advisory trigger levels, thus indicating no justification for issuance of a consumption advisory for this waterbody and “full support” of fish consumption uses.

Monitoring and Methods
Assessment Key Dates
9/1/2011 Fish Tissue Monitoring
Methods
260 Fish tissue analysis