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 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: 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
Trend: Unknown
Created: 9/3/2020 11:57:52 AM
Updated: 10/9/2020 9:05:52 AM

Use Support

Class A1

Recreation - Primary contact

Partially Supported

Bacteria: Indicator Bacteria- E. coli

Support Level

Partially Supported

Impairment Code

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

Cause Magnitude

Moderate

Status

Delisted

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2008

Impairment Rationale

Geometric mean criterion exceeded

Cycle Delisted

2020

Delisting Rationale

TMDL preparation and approval

Data Source

Ambient monitoring: Iowa DNR-rivers

Class BWW1

Aquatic Life - Warm Water Type 1

Fully Supported

Class HH

Human Health -

Fully Supported

General Use

General Use water -

Not Assessed

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The Class A1 primary contact recreation use was assessed as "partially supported" due to 2016-2018 levels of indicator bacteria that violate state water quality criteria. The Class BWW1 aquatic life use was assessed as "fully supported" based on 2014 and 2016 biological sampling data and 2016-2018 water quality monitoring data. The Class HH (fish consumption) use was assessed as "fully supported" based on 2016-2018 water quality 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

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	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 / # Years	2016 Geometric Mean	2017 Geometric Mean	2018 Geometric Mean	Annual Geometric Mean Violation	# Violations	% Violations	Significantly >10% Violations	Assessment Type	Support Level
10920001	6	16 / 3	503.36	274.4	135.67	Yes	9	56%	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
10920001	6	36 / 3	8.8	7.9	7.9	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
10920001	6	Ammonia	36 / 3	0.78	0.13	0.02	0 / 0	0% / 0%	No	Monitored	Full
10920001	6	Chloride	36 / 3	47	18.5	17	0 / 0	0% / 0%	No	Monitored	Full
10920001	6	Dissolved oxygen	36 / 3	15.2	9.8	9.3	NA / 1	NA / 3%	No	Monitored	Full
10920001	6	pH	36 / 3	8.8	7.9	7.9	0 / NA	0% / NA	No	Monitored	Full
10920001	6	Sulfate	36 / 3	54	27	26	0 / NA	0% / NA	No	Monitored	Full
10920001	6	Temperature	36 / 3	28.8	12.3	10	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
10920001	6	Aluminum	9 / 2	12	2.958	0.66	0 / 0	0% / 0%	No	Evaluated	Full
10920001	6	Arsenic	9 / 2	2.7	1.47	1.4	0 / 0	0% / 0%	No	Evaluated	Full
10920001	6	Cadmium	9 / 2	0.13	0.037	0.025	0 / 0	0% / 0%	No	Evaluated	Full
10920001	6	Chromium	9 / 2	2.6	1.02	0.95	0 / 0	0% / 0%	No	Evaluated	Full
10920001	6	Copper	9 / 2	7.4	1.93	1	0 / 0	0% / 0%	No	Evaluated	Full
10920001	6	Lead	9 / 2	4.6	0.682	0.09	0 / 0	0% / 0%	No	Evaluated	Full
10920001	6	Nickel	9 / 2	6.8	3.8	3.3	0 / 0	0% / 0%	No	Evaluated	Full
10920001	6	Selenium	9 / 2	1.3	0.89	0.96	0 / 0	0% / 0%	No	Evaluated	Full
10920001	6	Zinc	9 / 2	11	2.27	1.7	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	72d BMIBI BIT	BMIBI Pass/ Fail
287	9/6/16	627	72d	MS/WW	Float ArtSub	68	Good	51	Pass
287	9/5/14	627	72d	MS/WW	Float ArtSub	71	Good	51	Pass

Overall Assessment:

Community	Assessment Type	Assessment Result	Support Level	Earned IR Category	Actual IR Category	Reason
Benthic Macroinvertebrates	Evaluated	Pass (2/2)	Full	1	1	Assessment is evaluated because the drainage area of the site is larger than the calibrated range.

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
10920001	6	Cadmium	9 / 2	0.13	0.037	0.025	8	No	Evaluated	Full
10920001	6	Chromium	9 / 2	2.6	1.02	0.95	0	No	Evaluated	Full
10920001	6	Copper	9 / 2	7.4	1.93	1	0	No	Evaluated	Full
10920001	6	Nickel	9 / 2	6.8	3.8	3.3	0	No	Evaluated	Full
10920001	6	Selenium	9 / 2	1.3	0.89	0.96	2	No	Evaluated	Full
10920001	6	Zinc	9 / 2	11	2.27	1.7	0	No	Evaluated	Full

Monitoring and Methods

Assessment Key Dates

9/5/2014

Biological Monitoring

1/6/2016

Fixed Monitoring Start Date

12/10/2018

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)

230

Fixed station physical/chemical (conventional plus toxic pollutants)

315

Regional reference site approach

320

Benthic macroinvertebrate surveys

330

Fish surveys

380

Quantitative physical habitat assessment

420

Indicator bacteria monitoring