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.

Open Data Collection Period Modal

For purposes of developing stream/river water quality assessments for integrated reporting, three years of water quality data are typically used for both conventional pollutant parameters (e.g., indicator bacteria) and the less frequently monitored toxic parameters (e.g., toxic metals). Since the 2004 IR cycle, DNR has used a three-year data gathering period for streams, rivers, and beaches. For most assessments, the use of three years of data increases the number of samples upon which the decision on use support is based and helps address the problem of weather-related year-to-year fluctuations in water quality.

Due to the lower sampling frequency in Iowa’s ambient lake, biological, fish kill, and fish tissue monitoring programs, five years of data are used for developing IR assessments and for identifying Section 303(d) listings.

Data Type	Data Timeframe
Beach Sampling Data	CY 2020 - 2022
Stream/River Water Quality Data	CY 2020 - 2022
Lake Water Quality Data	CY 2018 - 2022
Biological Sampling Data	CY 2018 - 2022*
Fish Kill Data	CY 2018 - 2022
Fish Tissue Sampling Data	CY 2018 - 2022
Continuous Dissolved Oxygen Sampling Data	CY 2018 - 2022
*Biological sites sampled in both 2017 and 2021 were also assessed.

Open Segment Map
View assessment methodology in new window

Cycle: 2024
Release Status: Final
Overall IR: 5 - Water is impaired or threatened and a TMDL is needed.
Trend: Unknown
Created: 11/1/2023 8:12:23 AM
Updated: 2/5/2024 3:29:26 PM

Use Support

Class A1

Presumptive Use

Recreation - Primary contact

Not Assessed

Class BWW2

Aquatic Life - Warm Water Type 2

Not Supported

Biological: low fish & invert IBIs- cause unknown

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.

As part of the 2002 REMAP sampling project, stream physical habitat assessment found adverse conditions that are thought to contribute to the biological impairment. These include, bank instability, excessive silt deposition, lack of instream cover, stream channelization and incision. Stream temperature exceeded 36C (97F) during continuous dissolved oxygen and temperature monitoring in June 2002. Channel alterations resulting in wide, shallow, and sluggish stream flow conditions probably contribute to elevated stream temperature.

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

200

Physical/Chemical Monitoring

315

Regional reference site approach

320

Benthic macroinvertebrate surveys

330

Fish surveys

380

Quantitative physical habitat assessment