White Breast Creek IA 04-LDM-1059

from mouth (S10 T76N R19W Marion Co.) to confluence with Little White Breast Cr. in S11 T73 R22 Lucas 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 2016 - 2018
Stream/River Water Quality Data	CY 2016 - 2018
Lake Water Quality Data	CY 2014 - 2018
Biological Sampling Data	CY 2014 - 2018*
Fish Kill Data	CY 2014 - 2018
Fish Tissue Sampling Data	CY 2014 - 2018
Continuous Dissolved Oxygen Sampling Data	CY 2014 - 2018
*Biological sites sampled in both 2013 and 2017 were also assessed.

Open Segment Map
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Cycle: 2020
Release Status: Final
Overall IR: 5 - Water is impaired or threatened and a TMDL is needed.
Trend: Unknown
Created: 6/4/2020 1:36:14 PM
Updated: 10/15/2020 11:45:25 AM

Use Support

Class A1

Recreation - Primary contact

Partially Supported

Bacteria: Indicator Bacteria- E. coli

Support Level

Partially Supported

Impairment Code

5a - Pollutant-caused impairment. TMDL needed.

Cause Magnitude

Slight

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2008

Impairment Rationale

Geometric mean criterion exceeded

Data Source

Ambient monitoring: Iowa DNR-rivers

TMDL Priority

Tier III

Class BWW1

Aquatic Life - Warm Water Type 1

WINOFI

Fish Kill: Caused By Fertilizer Spill

Support Level

Further Investigation Needed

Impairment Code

3b - Use potentially impaired based on an evaluated assessment.

Cause Magnitude

Moderate

Status

Continuing

Source

Spills/Dumping: Accidental release/spill

Source Confidence

N/A

Cycle Added

2012

Impairment Rationale

Pollutant-caused fish kill

Data Source

Fish kill investigation: Iowa DNR

Class HH

Human Health -

Not Assessed

General Use

General Use water -

Not Assessed

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The Class A1 use was assessed as "partially supported" due to levels of indicator bacteria that violated state water quality criteria. The Class BWW1 use remains assessed as "partially supported" based on results of a fish kill investigation. The Class HH (fish consumption) use was assessed as "fully supported" based on water quality monitoring data. All other designated uses were "not assessed".

Assessment Explanation

Sources of Data:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
Iowa DNR	6	WQ	CY 2016-2018	10630003	Whitebreast Creek near Dallas
Iowa DNR	6	BIO	See Below	1150	Whitebreast Creek	10 mi SW of Knoxville

Class A1 - Indicator Bacteria:

Site ID	Data Source ID	# Samples / # Years	2016 Geometric Mean	2017 Geometric Mean	2018 Geometric Mean	Annual Geometric Mean Violation	# Violations	% Violations	Significantly >10% Violations	Assessment Type	Support Level
10630003	6	20 / 3	1156.4	501.21	367.2	Yes	14	70%	Yes	Monitored	Partial

Class A - pH:

Site ID	Data Source ID	# Samples / # Years	Maximum Value	Mean Value	Median Value	# Violations	% Violations	Significantly >10% Violations	Assessment Type	Support Level
10630003	6	36 / 3	8.5	8	8.1	0	0%	No	Monitored	Full

Class BWW1 - Conventional Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Maximum Value	Mean Value	Median Value	# Acute / Chronic Violations	% Acute/ Chronic Violations	Significantly >10% Violations	Assessment Type	Support Level
10630003	6	Ammonia	36 / 3	0.46	0.07	0.02	0 / 0	0% / 0%	No	Monitored	Full
10630003	6	Chloride	36 / 3	110	32.7	30.5	0 / 0	0% / 0%	No	Monitored	Full
10630003	6	Dissolved oxygen	36 / 3	13.7	10.5	9.9	NA / 0	NA / 0%	No	Monitored	Full
10630003	6	pH	36 / 3	8.5	8	8.1	0 / NA	0% / NA	No	Monitored	Full
10630003	6	Sulfate	36 / 3	110	45	39	0 / NA	0% / NA	No	Monitored	Full
10630003	6	Temperature	36 / 3	30.4	13.3	12.9	0 / 0	0% / 0%	No	Monitored	Full

Class BWW1 - Toxic Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Maximum Value	Mean Value	Median Value	# Acute / Chronic Violations	% Acute/ Chronic Violations	>1 Acute / Chronic Violation	Assessment Type	Support Level
10630003	6	Aluminum	9 / 2	4.6	1.16	0.75	0 / 0	0% / 0%	No	Evaluated	Full
10630003	6	Arsenic	9 / 2	2	1.26	1.1	0 / 0	0% / 0%	No	Evaluated	Full
10630003	6	Cadmium	9 / 2	0.15	0.058	0.025	0 / 0	0% / 0%	No	Evaluated	Full
10630003	6	Chromium	9 / 2	0.93	0.61	0.63	0 / 0	0% / 0%	No	Evaluated	Full
10630003	6	Copper	9 / 2	3.5	2.2	2.1	1 / 1	11% / 11%	No	Evaluated	Full
10630003	6	Lead	9 / 2	0.15	0.087	0.09	0 / 0	0% / 0%	No	Evaluated	Full
10630003	6	Nickel	9 / 2	8.6	4.8	4.1	0 / 0	0% / 0%	No	Evaluated	Full
10630003	6	Selenium	9 / 2	1.3	0.98	0.99	0 / 0	0% / 0%	No	Evaluated	Full
10630003	6	Zinc	9 / 2	2.9	1.36	1.1	0 / 0	0% / 0%	No	Evaluated	Full

Class BWW1 - Biological Sampling:

Benthic Macroinvertebrates:

BioNet Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage/Thermal	BM Sample Gear	BMIBI score	BMIBI Class	40a BMIBI BIT	BMIBI Pass/ Fail
1150	7/20/17	336	40a	MS/WW	Hess	54	Fair	41	Pass
1150	9/9/15	336	40a	MS/WW	ArtSub	55	Fair	41	Pass

Overall:

Community	Assessment Type	Assessment Result	Support Level	Earned IR Category	Actual IR Category	Reason
Benthic Macroinvertebrates	Monitored	Pass (2/2)	Full	1	1	Assessment is monitored because it was based on samples collected in the last five years.

Class BWW1 – Fishkill Assessment:

The Class BWW1 use previously resided in Category 4d based on the assessment developed for the 2010 fish kill. Because no additional fish kills were reported in this segment for at least five years post fish kill (2015), the Category for the fish kill assessment was changed from 4d to 3b (potentially impaired). DNR believes that any impact from the fish kill from which the impairment was based has likely dissipated. If no additional fish kills are reported in the segment for an additional five-year period (2020), the Category will be changed from 3b to 3a (water not assessed). Details about the 2010 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/824.

Class HH-F - Toxic Parameters:

Class HH - No Data

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Maximum Value	Mean Value	Median Value	Number of Non - Detects	Mean Value > Criterion or MCL	Assessment Type	Support Level
10630003	6	Cadmium	9 / 2	0.15	0.058	0.025	6	No	Evaluated	Full
10630003	6	Chromium	9 / 2	0.93	0.61	0.63	0	No	Evaluated	Full
10630003	6	Copper	9 / 2	3.5	2.2	2.1	0	No	Evaluated	Full
10630003	6	Nickel	9 / 2	8.6	4.8	4.1	0	No	Evaluated	Full
10630003	6	Selenium	9 / 2	1.3	0.98	0.99	0	No	Evaluated	Full
10630003	6	Zinc	9 / 2	2.9	1.36	1.1	0	No	Evaluated	Full

Monitoring and Methods

Assessment Key Dates

8/23/2010

Fish Kill

1/11/2016

Fixed Monitoring Start Date

12/4/2018

Fixed Monitoring End Date

9/9/2015

Biological Monitoring

7/20/2017

Biological Monitoring

Methods

120

Surveys of fish and game biologists/other professionals

140

Incidence of spills and/or fish kills

150

Monitoring data more than 5 years old

230

Fixed station physical/chemical (conventional plus toxic pollutants)

315

Regional reference site approach

320

Benthic macroinvertebrate surveys

330

Fish surveys

420

Indicator bacteria monitoring