Iowa DNR
ADBNet

Water Quality Assessments

Impaired Waters List

Little Wapsipinicon River IA 01-WPS-399

From impoundment upstream of Hwy 281 at Fairbank (N 1/2 S5 T90N R10W Buchanan Co.) to the Fayette/Bremer county line in NW 1/4 S18 T92N R10W Fayette Co.

Assessment Cycle
2022
Release Status
Final
Data Collection Period
Overall IR Category
3 - Insufficient data exist to determine whether any designated uses are met.
Trend
Unknown
Created
1/7/2022 3:12:48 PM
Updated
1/13/2022 9:38:50 AM
Assessment conducted in accordance with Iowa's 2022 IR methodology
Use Support
Class A1
Not Assessed
Class BWW2
WINOFI
Fish Kill: Cause Unknown
Support Level
Water in Need of Further Investigation (WINOFI)
Impairment Code
3b - Use potentially impaired based on an evaluated assessment.
Cause Magnitude
Slight
Status
New
Source
Unknown: Source Unknown
Source Confidence
N/A
Cycle Added
2022
Impairment Rationale
Pollutant-caused fish kill
Data Source
Fish kill investigation: Iowa DNR
General Use
Not Assessed
Impairment Delistings
No delistings for this assessment cycle.
Documentation
Assessment Summary

The Class BWW2 use was assessed (evaluated) as “WINOFI” based on the results of a fish kill investigation. All other designated uses were "not assessed."

Assessment Explanation

Presumptive Class A1 –No Data

Class BWW2 – Fish kill Assessment:

The BWW2 aquatic life use assessment based on the 2020 fish kill placed this segment in Category 3b. This assessment was “evaluated” because there was a single fish kill on this segment in the last five years. Segments assessed using “evaluated” assessments are placed in Category 3b and are added to the state list of Waters In Need Of Further Investigation (WINOFI). If no additional fish kills are reported in this segment for a 10-year period (2030), the Category will be changed from 3b to 3a (not assessed).

Details about the 2020 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/1005


Monitoring and Methods
Assessment Key Dates
9/8/2020 Fish Kill
Methods
120 Surveys of fish and game biologists/other professionals
140 Incidence of spills and/or fish kills