2022 Final assessment for Turkey River

Turkey River IA 01-TRK-148

mouth (Clayton Co.) to confluence with Volga R. in S26 T92N R4W Clayton Co.

Assessment Cycle

2022

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 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.

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

Created: 12/21/2021 12:47:09 PM
Updated: 1/28/2022 2:45:11 PM

Assessment conducted in accordance with Iowa's 2022 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

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

Fully Supported

Class HH

Not Supported

Fish Consumption Advisory: Mercury

Support Level

Not 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

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 (E. coli) that exceeded state water quality criteria. The Class BWW1 use was assessed as "fully supported" based on biological sampling data and continuous dissolved oxygen monitoring data. The Class HH use remains assessed as "not supported" based on fish tissue sampling data and the existence of a one meal per week mercury consumption advisory.

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	10220001	Turkey River near Garber
USGS	11	WQ	CY 2018-2019	5412500	Turkey River at Garber, IA
Iowa DNR	6	BIO	See Below	390	Turkey River	Garber – REMAP #70
Iowa DNR	6	BIO	See Below	840	Turkey River	Garber
Iowa DNR	6	FT	See Below	125	Turkey River	S of Garber

Presumptive 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

10220001

6/7/8

992

466

115

YES

4 / NA

4 / 3

2 / 3

YES

Monitored

Not

Class A1 - 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
10220001	6	36 / 3	6.8	8.4	8.1	0	7	NO	Monitored	Full
5412500	11	10 / 2	7.5	8.2	7.8	0	3	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
10220001	6	Ammonia	36 / 3	0.025	0.4	0.05	NA	0 / 0	7	NO	Monitored	Full
10220001	6	Chloride	36 / 3	5.7	22	14.2	NA	0 / 0	7	NO	Monitored	Full
10220001	6	Dissolved Oxygen	36 / 3	7.9	13.6	10.8	0	NA / NA	7	NO	Monitored	Full
5412500	11	Dissolved Oxygen	10 / 2	7.8	14.4	9.4	0	NA / NA	3	NO	Monitored	Full
10220001	6	pH	36 / 3	6.8	8.4	8.1	0	NA / NA	7	NO	Monitored	Full
5412500	11	pH	10 / 2	7.5	8.2	7.8	0	NA / NA	3	NO	Monitored	Full
10220001	6	Sulfate	36 / 3	7.1	26	17.5	0	NA / NA	7	NO	Monitored	Full
10220001	6	Temperature	36 / 3	0.2	25.5	11.4	0	NA / NA	7	NO	Monitored	Full
5412500	11	Temperature	10 / 2	1.9	21.1	16.1	0	NA / NA	3	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
10220001	6	Aluminum	14 / 3	6.7	1.6	0.5	0 / 0	NO	Monitored	Full
10220001	6	Arsenic	13 / 3	1	0.58	0.55	0 / 0	NO	Monitored	Full
10220001	6	Cadmium	13 / 3	0.025	0.025	0.025	0 / 0	NO	Monitored	Full
10220001	6	Chromium	13 / 3	1.2	0.9	0.9	0 / 0	NO	Monitored	Full
10220001	6	Lead	13 / 3	0.31	0.12	0.12	0 / 0	NO	Monitored	Full
10220001	6	Nickel	13 / 3	3.3	2.3	2.2	0 / 0	NO	Monitored	Full
10220001	6	Silver	13 / 3	0.025	0.025	0.025	0 / 0	NO	Monitored	Full
10220001	6	Zinc	13 / 3	7	2.08	1.5	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	52b BMIBI BIT	BMIBI Pass/ Fail
390	8/31/20	1553	52b	MS	Floating Art Sub	54	Fair	61	Fail
840	9/21/17	1553	52b	MS	Floating Art Sub	70	Good	61	Pass
840	10/7/14	1553	52b	MS	Floating Art Sub	65	Good	61	Pass

Fish:

Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage	Riffle Stream?	FIBI score	FIBI Class	52b FIBI BIT	FIBI Pass/ Fail
390	8/31/20	1553	52b	MS	NA	75	Excellent	52	Pass

Overall:

Community	Assessment Type	Assessment Result	Support Level	IR Category	Reason
Benthic Macroinvertebrates	Evaluated	Pass (2/3)	Full
Fish	Evaluated	Pass (1/1)	Full	1	Assessment was evaluated because the drainage areas of the sample sites
Overall	Evaluated	Pass	Full		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	NA	NA	NA	NA	0/4	No
390	6	0/0/0/0/14	16 hr	NA	NA	NA	NA	0/4	No	Evaluated	Full

Class HH - Fish Tissue Sampling:

Site ID	Biopart	Year	Species	# in sample / # of samples	Avg Length (cm)	(Avg) Hg (ppm)	Chlordane (ppm)	Sum PCBs (ppm)
125	tissue plug	2012	smallmouth bass	5	34.6	0.467
125	tissue plug	2011	smallmouth bass	5	41.7	0.376
Support Level	Not	A one meal/week mercury consumption advisory for any predator fish exists on this segment. Based on IR Methodology, the Class HH (fish consumption) use was assessed as “not supported.”

Monitoring and Methods

Assessment Key Dates

8/31/2020	Biological Monitoring
9/22/2011	Fish Tissue Monitoring
8/14/2012	Fish Tissue Monitoring
1/3/2018	Fixed Monitoring Start Date
12/3/2020	Fixed Monitoring End Date
9/21/2017	Biological Monitoring
10/7/2014	Biological Monitoring

Methods

150	Monitoring data more than 5 years old
222	Non-fixed-station monitoring (conventional during key seasons and flows)
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

Water Quality Assessments

Impaired Waters List

Turkey River IA 01-TRK-148

Assessment Summary

Assessment Explanation

Assessment Key Dates

Methods