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
2022
Release Status
Final
Cycle Period
2018 - 2020
Overall IR Category
5 - Water is impaired or threatened and a TMDL is needed.
Trend
Unknown
Created
12/7/2021 3:36:26 PM
Updated
1/4/2022 8:57:52 AM
Assessment conducted in accordance with Iowa's 2022 IR methodology
Use Support
Class A1
Not Assessed
Class BWW1
Not Assessed
Class HH
Not Supported
Fish Consumption Advisory: Mercury
Support Level
Not Supported
Impairment Code
5a - Pollutant-caused impairment. TMDL needed.
Cause Magnitude
Moderate
Status
New
Source
Unknown: Source Unknown
Source Confidence
N/A
Cycle Added
2022
Impairment Rationale
Fish consumption advisory in effect: no more than 1 meal/week
Data Source
Fish contaminant monitoring: Iowa DNR
TMDL Priority
Tier IV
Impairment Delistings
No delistings for this assessment cycle.
Documentation
Assessment Summary

The Class HH (fish consumption) use was assessed as "not supported" because a one meal/week mercury consumption advisory for walleye exists on this segment. All other designated uses were "not assessed."

Assessment Explanation

Data Sources:

Data Source

Data Source ID

Data Type

Data Age

Site ID

Site Name

Site Description

Iowa DNR

6

FT

See Below

163

Wapsipinicon River

1 mi. SE of Independence


Class A1 - No Data

Class BWW1 - No Data

Class HH - Fish Tissue Sampling:

Site ID

Biopart

Year

Species

# in sample / # of samples

Avg Length (cm)

(Avg) Hg (ppm)

Chlordane (ppm)

Sum PCBs (ppm)

163

fillet

2011

channel catfish

5

39.3

0.067

0.031

0.09

163

tissue plug

2011

smallmouth bass

5

33.2

0.245

Support Level

Not

A one meal/week mercury consumption advisory for walleye exists on this segment. Based on IR Methodology, the Class HH (fish consumption) use was assessed as “not supported.”

Monitoring and Methods
Assessment Key Dates
9/1/2011 Fish Tissue Monitoring
Methods
260 Fish tissue analysis
150 Monitoring data more than 5 years old