Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

Indian Slough IA 02-IOW-1771

Louisa County S8T74NR3W 2.5 mi. NNW of Wapello.

Cycle
2024
Release Status
Final
Overall IR
3 - Insufficient data exist to determine whether any designated uses are met.
Trend
Unknown
Created
11/1/2023 8:13:46 AM
Updated
2/5/2024 12:46:22 PM
Use Support
Class BLW
Aquatic Life - Lakes and wetlands
WINOFI
Impairment Code
3b - Use potentially impaired based on an evaluated assessment.
Cause Magnitude
Moderate
Status
New
Source
Natural: Flooding
Source Confidence
Moderate
Cycle Added
2024
Impairment Rationale
Potential Impairment
Data Source
Biological monitoring: Iowa DNR Fisheries
Impairment Delistings
No delistings for this assessment cycle.
Documentation
Assessment Summary

The Class BLW use was assessed (evaluated) as ""WINOFI” based on information from the DNR Wildlife Bureau. All other designated uses were “not assessed.”

Assessment Explanation

Class BLW -

The Class BLW use was assessed (evaluated) as “WINOFI” based on information from the DNR Wildlife Bureau. According to local DNR Fisheries Biologist, repeated floods on the Iowa River have caused damage to infrastructure (dikes, culverts, etc.) and erosion that has led to the drainage of wetlands. Sedimentation from major floods has also negatively impacted the wetlands on the area. The assessment category for this wetland of “evaluated” indicates that the assessment is based entirely on “best professional judgment.” In terms of Section 305(b) reporting, “monitored assessments” are based primarily on recent, site-specific ambient monitoring data and thus have relatively high confidence. DNR considers waterbodies identified as “impaired” based on “monitored assessments” as candidates for the state's Section 303(d) list. “Evaluated assessments” are those based on data older than five years or other than site-specific ambient monitoring data (e.g., questionnaire surveys of fish and game biologists [=best professional judgment]) and thus have relatively lower confidence. DNR does not consider waterbodies identified as “impaired” based on “evaluated assessments” as candidates for the state's Section 303(d) list.

Class HH - Fish Tissue sampling: No Data

In general, Iowa wetlands are not managed for recreational fisheries; thus, fish contaminant monitoring is not typically conducted at these waterbodies."



This waterbody is not in June 2015 version of the Iowa SURFACE WATER CLASSIFICATION and is thus classified only for general uses. As such, only the general use protection for aquatic life will be assessed.


Monitoring and Methods
Assessment Key Dates

None listed

Methods
120
Surveys of fish and game biologists/other professionals