Turkey River IA 01-TRK-148

mouth (Clayton Co.) to confluence with Volga R. in S26 T92N 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: 8/14/2020 1:55:20 PM
Updated: 10/14/2020 10:08:30 AM

Assessment conducted in accordance with Iowa's 2020 IR methodology

Use Support

Class A1

Recreation

Primary contact

Presumptive Use

Partially Supported

Impairments

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

Further Investigation Needed

Support Level

Water in Need of Further Investigation (WINOFI)

Impairment Code

3b-u - Use potentially biologically impaired based on uncalibrated IBI metrics.

Cause Magnitude

Moderate

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

Low

Cycle Added

2010

Impairment Rationale

Low Biotic Index

Data Source

Biological monitoring: Iowa DNR Fisheries

Class HH

Human Health

Partially Supported

Impairments

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

2014

Impairment Rationale

Fish consumption advisory in effect: no more than 1 meal/week

Data Source

Fish contaminant monitoring: Iowa DNR

TMDL Priority

Tier IV

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 (E. coli) that exceeded state water quality criteria. The Class BWW1 use remains assessed as "partially supported" based on biological sampling data. The Class HH use remains assessed as "partially supported" based on fish tissue sampling data and the issuance of a consumption advisory in 2013.

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	10220001	Turkey River near Garber
USGS	11	WQ	CY 2018-2018	5412500	Turkey River at Garber, IA
Iowa DNR	6	BIO	See Below	840	Turkey River	Garber
Iowa DNR	6	BIO	See Below	390	Turkey River	Garber – REMAP #70
Iowa DNR	6	BIO	See Below	1060	Turkey River	Osterdock – TK002
Iowa DNR	6	FT	See Below	125	Turkey River	S of Garber

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
10220001	6	18 / 3	508.65	200.3	992.4	Yes	11	61%	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
10220001	6	36 / 3	8.4	8.1	8.1	0	0%	No	Monitored	Full
5412500	11	8 / 1	8.2	7.8	7.9	0	0%	No	Evaluated	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
10220001	6	Ammonia	36 / 3	0.35	0.04	0.02	0 / 0	0% / 0%	No	Monitored	Full
10220001	6	Chloride	36 / 3	22	16.6	17	0 / 0	0% / 0%	No	Monitored	Full
10220001	6	Dissolved oxygen	36 / 3	14.4	10.7	10.1	NA / 0	NA / 0%	No	Monitored	Full
5412500	11	Dissolved oxygen	8 / 1	14.4	9.5	9.1	NA / 0	NA / 0%	No	Evaluated	Full
10220001	6	pH	36 / 3	8.4	8.1	8.1	0 / NA	0% / NA	No	Monitored	Full
5412500	11	pH	8 / 1	8.2	7.8	7.9	0 / NA	0% / NA	No	Evaluated	Full
10220001	6	Sulfate	36 / 3	26	19.7	20	0 / NA	0% / NA	No	Monitored	Full
10220001	6	Temperature	36 / 3	23.2	11.4	12.1	0 / 0	0% / 0%	No	Monitored	Full
5412500	11	Temperature	8 / 1	21.1	16.1	17.5	0 / 0	0% / 0%	No	Evaluated	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
10220001	6	Aluminum	9 / 2	6.7	1.978	0.89	0 / 0	0% / 0%	No	Evaluated	Full
10220001	6	Arsenic	9 / 2	1	0.65	0.64	0 / 0	0% / 0%	No	Evaluated	Full
10220001	6	Cadmium	9 / 2	0.025	0.025	0.025	0 / 0	0% / 0%	No	Evaluated	Full
10220001	6	Chromium	9 / 2	1.4	0.94	0.98	0 / 0	0% / 0%	No	Evaluated	Full
10220001	6	Copper	9 / 2	1.2	0.7	0.6	0 / 0	0% / 0%	No	Evaluated	Full
10220001	6	Lead	9 / 2	0.31	0.088	0.05	0 / 0	0% / 0%	No	Evaluated	Full
10220001	6	Nickel	9 / 2	2.3	2	2	0 / 0	0% / 0%	No	Evaluated	Full
10220001	6	Selenium	9 / 2	1.4	0.76	0.76	0 / 0	0% / 0%	No	Evaluated	Full
10220001	6	Zinc	9 / 2	7	2.5	1.5	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	52b BMIBI BIT	BMIBI Pass/ Fail
840	9/21/17	1553	52b	MS/WW	Float ArtSub	70	Good	61	Pass
840	10/7/14	1553	52b	MS/WW	Float ArtSub	65	Good	61	Pass

Fish:

BioNet Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage/Thermal	Riffle Stream?	FIBI score	FIBI Class	52b FIBI BIT	FIBI Pass/ Fail
390	10/3/03	1553	52b	MS/WW	NA	75	Excellent	52	Pass
1060	7/26/02	1606	52b	MS/WW	NA	39	Fair	52	Fail

Overall Assessment:

Community	Assessment Type	Assessment Result	Support Level	Earned IR Category	Actual IR Category	Reason
Benthic Macroinvertebrates	Monitored	Pass (2/2)	Full
Fish	Evaluated	Fail (1/2)	Partial
Overall	Evaluated	Fail	Partial	3bu	3bu	Assessment is evaluated because the drainage areas of all the sites were larger than the calibrated range.

Class HH – Fish Tissue Sampling:

Site ID	Date	Species Name	Biopart	# in sample	Hg result	Hg violation (>0.3)?	Assessment Type	Support Level
125	8/14/12	smallmouth bass	plug	5	0.467	Yes	Evaluated	Partial
125	9/22/11	smallmouth bass	plug	5	0.376	Yes	Evaluated	Partial

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
10220001	6	Cadmium	9 / 2	0.025	0.025	0.025	9	No	All Non-Detect	Full
10220001	6	Chromium	9 / 2	1.4	0.94	0.98	0	No	Evaluated	Full
10220001	6	Copper	9 / 2	1.2	0.7	0.6	0	No	Evaluated	Full
10220001	6	Nickel	9 / 2	2.3	2	2	0	No	Evaluated	Full
10220001	6	Selenium	9 / 2	1.4	0.76	0.76	2	No	Evaluated	Full
10220001	6	Zinc	9 / 2	7	2.5	1.5	0	No	Evaluated	Full

Monitoring and Methods

Assessment Key Dates

7/26/2002

Biological Monitoring

10/3/2003

Biological Monitoring

9/22/2011

Fish Tissue Monitoring

8/14/2012

Fish Tissue Monitoring

1/11/2016

Fixed Monitoring Start Date

12/5/2018

Fixed Monitoring End Date

9/21/2017

Biological Monitoring

10/7/2014

Biological Monitoring

Methods

150

Monitoring data more than 5 years old

220

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

240

Non-fixed station physical/chemical (conventional + toxicants)

260

Fish tissue analysis

315

Regional reference site approach

320

Benthic macroinvertebrate surveys

330

Fish surveys

420

Indicator bacteria monitoring