Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

White Breast Creek IA 04-LDM-1825

from confluence with Brush Cr. (S22 T72N R23W Lucas Co.) to confluence with unnamed tributary in S4 T71N R24W Clarke Co.

This is a DRAFT assessment
Draft assessments may change without notice
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Cycle
2026
Current Phase
Public Comment
Overall IR
5 - Water is impaired or threatened and a TMDL is needed.
Trend
Stable
Created
10/27/2025 3:08:47 PM
Updated
12/3/2025 11:41:39 AM
Use Support
Class A1
Presumptive Use
Recreation - Primary contact
Not Assessed
Class BWW2
Aquatic Life - Warm Water Type 2
Not Supported
Support Level
Not Supported
Impairment Code
5b-t - Biological - tentative
Cause Magnitude
Moderate
Status
Continuing
Source
Hydromodification: Habitat Modification
Source Confidence
Low
Cycle Added
2004
Impairment Rationale
Low Biotic Index
Data Source
Biological monitoring: Iowa DNR WQMA
TMDL Priority
Tier IV
Impairment Delistings
No delistings for this assessment cycle.
Documentation
Assessment Summary

The Class BWW2 use was assessed as “not supported” based on biological sampling data. 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

BIO

See Below

327

White Breast Creek

Woodburn – REMAP #54


Presumptive Class A1 – No Data


Class BWW2 - Biological Sampling:


Benthic Macroinvertebrates:

Site ID

Date

Drainage Area (mi2)

Ecoregion

Major Drainage

BM Sample Gear

BMIBI score

BMIBI Class

40a BMIBI BIT

BMIBI Pass/ Fail

327

7/17/19

95.3

40a

MS

ArtSub

56

Good

41

Pass


Fish:

Site ID

Date

Drainage Area (mi2)

Ecoregion

Major Drainage

Riffle Stream?

FIBI score

FIBI Class

40a FIBI BIT

FIBI Pass/ Fail

327

7/17/19

95.3

40a

MS

NA

1

Poor

33

Fail


Overall:

Community

Assessment Type

Assessment Result

Support Level

IR Category

Reason

Benthic Macroinvertebrates

Evaluated

Pass (1/1)

Full

Assessment was evaluated because it was based on a single sample.

Fish

Evaluated

Fail (0/1)

Not

5bt

This Category 5 impairment was based on old assessment methodology

Overall

Evaluated

Fail

Not

that only required a single failed sample result for impairment.


Class BWW2- Continuous DO Monitoring:

Site ID

Data Source ID

# Days Monitoring (2019)

DO Criteria Type

# 2019 violations/Violations needed for impairment

Violates Annual Significantly >10% Rule?

Assessment Type

Support Level

24 hr

0/4

No

327

6

14

16 hr

0/4

No

Evaluated

Full

Monitoring and Methods
Assessment Key Dates
7/17/2019
Biological Monitoring
7/3/2019
Monitoring Start
7/17/2019
Monitoring End
Methods
150
Monitoring data more than 5 years old
200
Physical/Chemical Monitoring
315
Regional reference site approach
320
Benthic macroinvertebrate surveys
330
Fish surveys