English River IA 02-IOW-671

mouth (S12 T77N R6W Washington Co.) to confluence with Ramsey Cr. in S14 T77N R8W Washington 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 2018 - 2020
Stream/River Water Quality Data	CY 2018 - 2020
Lake Water Quality Data	CY 2016 - 2020
Biological Sampling Data	CY 2016 - 2020*
Fish Kill Data	CY 2016 - 2020
Fish Tissue Sampling Data	CY 2016 - 2020
Continuous Dissolved Oxygen Sampling Data	CY 2016 - 2020
*Biological sites sampled in both 2015 and 2019 were also assessed.

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Cycle: 2022
Release Status: Final
Overall IR: 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
Trend: Unknown
Created: 12/8/2021 11:40:09 AM
Updated: 1/25/2022 1:00:36 PM

Use Support

Class A1

Recreation - Primary contact

Not Supported

Bacteria: Indicator Bacteria- E. coli

Support Level

Not Supported

Impairment Code

4a - Pollutant-caused impairment. TMDL has been completed.

Cause Magnitude

Moderate

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

Class BWW1

Aquatic Life - Warm Water Type 1

WINOFI

Organic Enrichment: Low Dissolved Oxygen

Support Level

Further Investigation Needed

Impairment Code

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

Cause Magnitude

Slight

Status

New

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2022

Impairment Rationale

Significantly > 10% of days fail to meet 24-hour criteria

Data Source

Ambient monitoring: Iowa DNR-continuous

Class HH

Human Health -

Not Assessed

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The Class A1 use was assessed as "not supported" due to levels of indicator bacteria that violated state water quality criteria. The Class BWW1 use was assessed as "fully supported" based on biological sampling data and assessed as "WINOFI" based on continuous dissolved oxygen monitoring data. All other designated uses were "not assessed." Note: A TMDL covering the bacteria impairments for all segments, with the segment code prefix "IA 02-IOW" in the Iowa River Basin, was approved by EPA in 2018. Due to the completion of the TMDL, the IR category for the Class A1 use was changed from 5a (impaired; TMDL needed) to 4a (impaired; TMDL approved).

Assessment Explanation

Data Sources:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
Iowa DNR	6	WQ	CY 2018-2020	10920001	English River at Riverside
Iowa DNR	6	BIO	See Below	287	English River	Riverside

Class A1 - Indicator Bacteria:

Site ID

Data Source ID

# Samples per Year (2018/ 2019/2020)

2018 Geometric Mean

2019 Geometric Mean

2020 Geometric Mean

Violates Annual Geometric Mean?

# 2018 SSM violations / SSM Violations needed for impairment

# 2019 SSM violations / SSM Violations needed for impairment

# 2020 SSM violations / SSM Violations needed for impairment

Violates Annual SSM Significantly >10% Rule?

Assessment Type

Support Level

10920001

4/5/6

136

1551

419

YES

1 / NA

4 / NA

3 / NA

YES

Evaluated

Not

Class A - 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
10920001	6	36 / 3	6.7	8.8	7.9	0	7	NO	Monitored	Full

Class BWW1 - Conventional 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
10920001	6	Ammonia	36 / 3	0.02	0.78	0.11	NA	0 / 0	7	NO	Monitored	Full
10920001	6	Chloride	36 / 3	8.9	32	18.9	NA	0 / 0	7	NO	Monitored	Full
10920001	6	Dissolved Oxygen	36 / 3	3	15.2	9.9	1	NA / NA	7	NO	Monitored	Full
10920001	6	pH	36 / 3	6.7	8.8	7.9	0	NA / NA	7	NO	Monitored	Full
10920001	6	Sulfate	36 / 3	11	54	26	0	NA / NA	7	NO	Monitored	Full
10920001	6	Temperature	36 / 3	0	27.3	11.6	0	NA / NA	7	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	>1 Acute / Chronic Violation	Assessment Type	Support Level
10920001	6	Aluminum	14 / 3	12	2.918	0.73	0 / 0	NO	Monitored	Full
10920001	6	Arsenic	13 / 3	2.7	1.2	1	0 / 0	NO	Monitored	Full
10920001	6	Cadmium	13 / 3	0.13	0.04	0.02	0 / 0	NO	Monitored	Full
10920001	6	Chromium	13 / 3	2.6	0.9	0.8	0 / 0	NO	Monitored	Full
10920001	6	Lead	13 / 3	4.6	0.6	0.2	0 / 0	NO	Monitored	Full
10920001	6	Nickel	13 / 3	6.8	3.5	3.1	0 / 0	NO	Monitored	Full
10920001	6	Silver	13 / 3	0.025	0.025	0.025	0 / 0	NO	Monitored	Full
10920001	6	Zinc	13 / 3	24	4.72	2.4	0 / 0	NO	Monitored	Full

Class BWW1 - Biological Sampling:

Benthic Macroinvertebrates:

Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage	BM Sample Gear	BMIBI score	BMIBI Class	72d BMIBI BIT	BMIBI Pass/Fail
287	8/7/20	627	72d	MS	Floating Art Sub	71	Good	51	Pass
287	9/6/16	627	72d	MS	Floating Art Sub	68	Good	51	Pass

Overall:

Community	Assessment Type	Assessment Result	Support Level	IR Category	Reason
Benthic Macroinvertebrates	Evaluated	Pass (2/2)	Full		Assessment was evaluated because the drainage area of the sample site
Overall	Evaluated	Pass	Full	1	was greater than the calibrated range.

Class BWW1 - Continuous DO Monitoring:

Site ID	Data Source ID	# Days Monitoring (2016/2017/2018/ 2019/2020)	DO Criteria Type	# 2016 violations / Violations needed for impairment	# 2017 violations / Violations needed for impairment	# 2018 violations / Violations needed for impairment	# 2019 violations / Violations needed for impairment	# 2020 violations / Violations needed for impairment	Violates Annual Significantly >10% Rule?	Assessment Type	Support Level
			24 hr	5/5	NA	NA	NA	NA	Yes
287	6	23/0/0/0/0	16 hr	3/5	NA	NA	NA	NA	No	Evaluated	WINOFI

Class HH - No Data:

Monitoring and Methods

Assessment Key Dates

8/7/2020

Biological Monitoring

1/4/2018

Fixed Monitoring Start Date

12/8/2020

Fixed Monitoring End Date

9/6/2016

Biological Monitoring

3/9/2018

TMDL Completed

Methods

220

Non-fixed station physical/chemical monitoring (conventional pollutant only)

222

Non-fixed-station monitoring (conventional during key seasons and flows)

230

Fixed station physical/chemical (conventional plus toxic pollutants)

315

Regional reference site approach

320

Benthic macroinvertebrate surveys

420

Indicator bacteria monitoring