2024 Pending assessment for Bloody Run

Bloody Run IA 01-YEL-433

mouth (Clayton Co.) to west line of S22 T95N R4W Clayton Co.

Assessment Cycle

2024

Release Status

Pending

Data Collection Period

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.

Overall IR Category: 5 - Water is impaired or threatened and a TMDL is needed.
Trend: Unknown

Created: 11/1/2023 8:12:42 AM
Updated: 1/22/2024 8:54:16 AM

Assessment conducted in accordance with Iowa's 2024 IR methodology.

Use Support

Class A1

Presumptive Use

Not Supported

Bacteria: Indicator Bacteria- E. coli

Support Level

Not Supported

Impairment Code

5p - Impairment occurs on a waterbody with a presumptive A1 or B(WW1) use.

Cause Magnitude

Slight

Status

Continuing

Source

Natural

Source Confidence

Moderate

Cycle Added

2010

Impairment Rationale

Geometric mean criterion exceeded

Data Source

Special project/study: Iowa DNR

TMDL Priority

Tier III

Class A2

Fully Supported

Class BCW1

Not Supported

Fish Kill: Caused By Fuel Spill

Support Level

Water in Need of Further Investigation (WINOFI)

Impairment Code

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

Cause Magnitude

Moderate

Status

Continuing

Source

Spills/Dumping: Spills From Trucks or Trains

Source Confidence

High

Cycle Added

2022

Impairment Rationale

Potential Impairment

Data Source

Fish kill investigation: Iowa DNR

Biological: low aquatic macroinvertebrate IBI

Support Level

Not Supported

Impairment Code

5b-v - Biological - verified

Cause Magnitude

Slight

Status

New

Source

Unknown: Source Unknown

Source Confidence

Low

Cycle Added

2024

Impairment Rationale

Low Biotic Index

Data Source

Biological monitoring: Iowa DNR WQMA

TMDL Priority

Tier IV

Class HH

Fully Supported

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The presumptive Class A1 use was assessed as “not supported” based on levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class A2 use was assessed as “fully supported” based on the same bacteria monitoring data. The Class BCW1 use was assessed (evaluated) as "not supported" based on biological sampling data and "WINOFI" based on the results of a fish kill investigation. The Class HH use was assessed as "fully supported" based on water quality monitoring data.

Assessment Explanation

Data Sources:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
Iowa DNR	6	WQ	CY 2020-2022	10220003	Bloody Run Creek Site #1 (BR01)
Iowa DNR	6	BIO	See Below	1324	Bloody Run Creek	below Beulah Falls
Iowa DNR	6	BIO	See Below	1152	Bloody Run Creek	HWY 18 bridge W of Marquette

Class A1 - Indicator Bacteria:

Site ID

Data Source ID

# Samples per Year (2020/ 2021/2022)

2020 Geometric Mean

2021 Geometric Mean

2022 Geometric Mean

Violates Annual Geometric Mean?

# 2020 SSM violations / SSM Violations needed for impairment

# 2021 SSM violations / SSM Violations needed for impairment

# 2022 SSM violations / SSM Violations needed for impairment

Violates Annual SSM Significantly >10% Rule?

Assessment Type

Support Level

10220003

8/8/8

2 / 3

3 / 3

YES

Mon

Not

Class A2 + BCW1 or OIW - Indicator Bacteria:

Site ID

Data Source ID

# Samples per Year (2020/ 2021/2022)

2020 Geometric Mean

2021 Geometric Mean

2022 Geometric Mean

Violates Annual Geometric Mean?

# 2020 SSM violations / SSM Violations needed for impairment

# 2021 SSM violations / SSM Violations needed for impairment

# 2022 SSM violations / SSM Violations needed for impairment

Violates Annual SSM Significantly >10% Rule?

Assessment Type

Support Level

10220003

12/12/12

2 / 4

0 / 4

1 / 4

Mon

Full

Classes A1 & A2 – pH:

Site ID	Data Source ID	# Samples / # Years	Minimum Value	Maximum Value	Mean Value	# Violations	Violations needed for impairment	Violates Significantly >10% Rule?	Assessment Type	Support Level
10220003	6	36 / 3	7.9	8.6	8.2	0	7	NO	Mon	Full

Class BCW1 - Binomial Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Minimum Value	Maximum Value	Mean Value	# Violations	# Acute / Chronic Violations	Violations needed for impairment	Violates Significantly >10% Rule?	Assessment Type	Support Level
10220003	6	Chloride	36 / 3	9.3	14	11.9	NA	0 / 0	7	NO	Mon	Full
10220003	6	Dissolved Oxygen	36 / 3	9.4	15.9	12.7	0	NA / NA	7	NO	Mon	Full
10220003	6	pH	36 / 3	7.9	8.6	8.2	0	NA / NA	7	NO	Mon	Full
10220003	6	Sulfate	36 / 3	12	19	16	0	NA / NA	7	NO	Mon	Full
10220003	6	Temperature	36 / 3	2.4	18.4	10.4	0	NA / NA	7	NO	Mon	Full

Class BCW1 - Toxic Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Maximum Value	Mean Value	Median Value	# Acute / Chronic Violations	>1 Acute / Chronic Violation	Assessment Type	Support Level
10220003	6	Aluminum	21 / 3	1100	141	60	0 / 1	NO	Mon	Full
10220003	6	Ammonia	36 / 3	0.08	0.03	0.02	0 / 0	NO	Mon	Full
10220003	6	Cadmium	20 / 3	0.5	0.5	0.5	0 / 0	NO	Mon	Full
10220003	6	Chromium	20 / 3	2.5	0.8	0.7	0 / 0	NO	Mon	Full
10220003	6	Lead	20 / 3	1	0.9	1	0 / 0	NO	Mon	Full
10220003	6	Nickel	20 / 3	3.2	0.7	0.2	0 / 0	NO	Mon	Full
10220003	6	Selenium	18 / 2	1	0.5	0.5	0 / 0	NO	Mon	Full
10220003	6	Silver	20 / 3	1	0.902	1	0 / 0	NO	Mon	Full
10220003	6	Zinc	20 / 3	3.5	0.8	0.5	0 / 0	NO	Mon	Full

Class BCW1 - Biological Sampling:

Benthic Macroinvertebrates:

BioNet Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage	BM Sample Gear	CBI score	CBI Class	CBI BIT	CBI Pass/Fail
1324	9/6/22	10.5	52b	MS	Hess	39	NA	60	Fail
1324	9/7/21	10.5	52b	MS	Hess	57	NA	60	Fail
1152	8/28/17	35.0	52b	MS	Hess	57	NA	60	Fail

Overall Assessment:

Community	Assessment Type	Assessment Result	Support Level	IR Category	Reason
Benthic Macroinvertebrates	Evaluated	Fail (0/3)	Not	5bv	Assessment was monitored because it was based on two or more samples collected in a five-year period in the last six years.

Class BCW1 – Trout Natural Reproduction:

Based on the January 2024 trout reproduction in Iowa streams summary prepared by the DNR Fisheries Bureau, the Class BCW1 use of Bloody Run Creek was assessed as "fully supported." According to the updated summary, this stream was placed in Category I: streams that exhibit consistent natural reproduction and maintain a wild population of one or more trout species without any stocking.

Class BCW1 – Fish kill Assessment:

The Class BCW1 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 5-year period (2025), 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/992

Class HH-F - Toxic Parameters:

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
10220003	6	Selenium	20 / 3	1	0.5	0.5	17	NO	Mon	Full

Monitoring and Methods

Assessment Key Dates

1/7/2020	Monitoring Start
12/1/2022	Monitoring End
1/1/2024	Biological Monitoring
9/6/2022	Biological Monitoring
4/20/2020	Fish Kill
9/7/2021	Biological Monitoring
8/28/2017	Biological Monitoring

Methods

140	Incidence of spills and/or fish kills
200	Physical/Chemical Monitoring
315	Regional reference site approach
320	Benthic macroinvertebrate surveys
330	Fish surveys
420	Indicator bacteria monitoring

Water Quality Assessments

Impaired Waters List

Bloody Run IA 01-YEL-433

Assessment Summary

Assessment Explanation

Assessment Key Dates

Methods