2020 Final assessment for Bloody Run

Bloody Run IA 01-YEL-433

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

Assessment Cycle

2020

Release Status

Final

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 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.

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

Created: 8/27/2020 12:09:50 PM
Updated: 10/16/2020 6:51:13 AM

Assessment conducted in accordance with Iowa's 2020 IR methodology

Use Support

Class A1

Presumptive Use

Partially Supported

Bacteria: Indicator Bacteria- E. coli

Support Level

Partially 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

Presumptive Use

Fully Supported

Class BCW1

Fully Supported

Class HH

Fully Supported

General Use

Not Assessed

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The presumptive Class A1 use remains assessed as “partially supported” due to levels of indicator bacteria that slightly exceeded the Class A1 single sample criterion. The presumptive Class A2 use was assessed as “fully supported” based on the same monitoring data. The Class BCW1 use was assessed as "fully supported" based on biological sampling data, on the trout reproduction in Iowa streams summary prepared by the DNR Fisheries Bureau, and water quality sampling data. The Class HH use was assessed as “fully supported” based on water quality monitoring data.

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	10220003	Bloody Run Creek Site #1 (BR01)
Iowa DNR	6	BIO	See Below	1152	Bloody Run Creek	HWY 18 Bridge W of Marquette

Presumptive 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
10220003	6	22 / 3	85.45	88.49	583.54	Yes	8	36%	Yes	Monitored	Partial

Presumptive Class A2 - 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
10220003	6	33 / 3	47.6	59.8	190.07	No	2	6%	No	Monitored	Full

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
10220003	6	36 / 3	8.4	8.1	8.1	0	0%	No	Monitored	Full

Class BCW1 - 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
10220003	6	Ammonia	36 / 3	0.025	0.03	0.02	0 / 0	0% / 0%	No	Monitored	Full
10220003	6	Chloride	36 / 3	16	12.1	12	0 / 0	0% / 0%	No	Monitored	Full
10220003	6	Dissolved oxygen	36 / 3	14.4	11.7	11.8	NA / 0	NA / 0%	No	Monitored	Full
10220003	6	pH	36 / 3	8.4	8.1	8.1	0 / NA	0% / NA	No	Monitored	Full
10220003	6	Sulfate	36 / 3	23	17	17	0 / NA	0% / NA	No	Monitored	Full
10220003	6	Temperature	36 / 3	17.5	9.9	11.1	0 / 0	0% / 0%	No	Monitored	Full

Class BCW1 - 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
10220003	6	Aluminum	9 / 2	1.7	0.363	0.11	0 / 0	0% / 0%	No	Evaluated	Full
10220003	6	Arsenic	9 / 2	0.9	0.53	0.51	0 / 0	0% / 0%	No	Evaluated	Full
10220003	6	Cadmium	9 / 2	0.025	0.025	0.025	0 / 0	0% / 0%	No	Evaluated	Full
10220003	6	Chromium	9 / 2	2.1	1.34	1.3	0 / 0	0% / 0%	No	Evaluated	Full
10220003	6	Copper	9 / 2	0.82	0.43	0.4	0 / 0	0% / 0%	No	Evaluated	Full
10220003	6	Lead	9 / 2	0.28	0.095	0.025	0 / 0	0% / 0%	No	Evaluated	Full
10220003	6	Nickel	9 / 2	1.9	1.7	1.7	0 / 0	0% / 0%	No	Evaluated	Full
10220003	6	Selenium	9 / 2	1	0.77	0.81	0 / 0	0% / 0%	No	Evaluated	Full
10220003	6	Zinc	9 / 2	2.6	1.16	1	0 / 0	0% / 0%	No	Evaluated	Full

Class BCW1 - Biological Sampling:

Benthic Macroinvertebrates:

BioNet Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage/ Thermal	BM Sample Gear	CBI score	CBI Class	CBI BIT	CBI Pass/ Fail
1152	8/28/17	35	52b	MS/CW	Hess	55	NA	60	Pass

Overall Assessment:

Community	Assessment Type	Assessment Result	Support Level	Earned IR Category	Actual IR Category	Reason
Benthic Macroinvertebrates	Evaluated	Pass (1/1)	Full	1	1	Assessment is evaluated because a single sample was used to complete the assessment and the UAV (8 points) was applied to the single CBI sample.

Class BCW1 – Trout Natural Reproduction:

Based on the January 2020 trout reproduction in Iowa streams summary prepared by the DNR Fisheries Bureau, the Class BCW1 coldwater aquatic life

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 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	Cadmium	9 / 2	0.025	0.025	0.025	9	No	Evaluated	Full
10220003	6	Chromium	9 / 2	2.1	1.34	1.3	0	No	Evaluated	Full
10220003	6	Copper	9 / 2	0.82	0.43	0.4	0	No	Evaluated	Full
10220003	6	Nickel	9 / 2	1.9	1.7	1.7	0	No	Evaluated	Full
10220003	6	Selenium	9 / 2	1	0.77	0.81	1	No	Evaluated	Full
10220003	6	Zinc	9 / 2	2.6	1.16	1	0	No	Evaluated	Full

Monitoring and Methods

Assessment Key Dates

1/11/2016	Fixed Monitoring Start Date
12/5/2018	Fixed Monitoring End Date
1/1/2020	Biological Monitoring
8/28/2017	Biological Monitoring

Methods

120	Surveys of fish and game biologists/other professionals
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

Water Quality Assessments

Impaired Waters List

Bloody Run IA 01-YEL-433

Assessment Summary

Assessment Explanation

Assessment Key Dates

Methods