Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

Turkey River IA 01-TRK-152

from bridge crossing at Elgin (S13 T94N R7 Fayette Co.) to confluence with Little Turkey R near Eldorado (S18 T95N R8W Fayette Co.).

Cycle
2020
Release Status
Final
Overall IR
5 - Water is impaired or threatened and a TMDL is needed.
Trend
Unknown
Created
8/10/2020 10:14:57 AM
Updated
12/3/2021 11:03:45 AM
Use Support
Class A1
Recreation - Primary contact
Not Supported
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
Geometric mean criterion exceeded
Data Source
Watershed project monitoring
TMDL Priority
Tier III
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 "not supported” due to levels of indicator bacteria that exceed Iowa water quality criteria. The Class BWW1 aquatic life use was assessed as "fully supported" based on 2012-2014 water quality monitoring. The Class HH (fish consumption) use remains assessed as “fully supporting" based on results of fish tissue monitoring in 2013 and 2014.

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 2012-2014

15330010

Turkey River at Great River Road/B40

TR50

Iowa DNR

6

WQ

CY 2012-2014

15330011

Turkey River at Great River Road/B40

TR60

Iowa DNR

6

FT

See Below

202

Turkey River

East of Clermont


Class A1 - Indicator Bacteria:

Site ID

Data Source ID

# Samples / # Years

2012 Geometric Mean

2013 Geometric Mean

2014 Geometric Mean

Annual Geometric Mean Violation

# Violations

% Violations

Significantly >10% Violations

Assessment Type

Support Level

15330010

6

24 / 3

107

2062

95

Yes

10

42%

Yes

Evaluated

Not

15330011

6

24 / 3

287

824

211

Yes

11

46%

Yes

Evaluated

Not

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

15330010

6

21 / 3

8.6

8.27

8.31

0

0%

No

Evaluated

Full

15330011

6

24 / 3

8.8

8.42

8.4

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

15330010

6

Ammonia

13 / 2

0.52

0.09

0.05

0 / 0

0% / 0%

No

Evaluated

Full

15330010

6

Chloride

16 / 2

33

31

31

0 / 0

0% / 0%

No

Evaluated

Full

15330010

6

Dissolved Oxygen

24 / 3

12

9.6

10

NA / 0

NA / 0%

No

Evaluated

Full

15330010

6

pH

21 / 3

8.6

8.27

8.31

0 / NA

0% / NA

No

Evaluated

Full

15330010

6

Temperature

24 / 3

27.8

16.3

16.6

0 / 0

0% / 0%

No

Evaluated

Full

15330011

6

Ammonia

15 / 2

0.48

0.08

0.05

0 / 0

0% / 0%

No

Evaluated

Full

15330011

6

Chloride

17 / 3

33

31

30

0 / 0

0% / 0%

No

Evaluated

Full

15330011

6

Dissolved Oxygen

24 / 3

10

8.8

9

NA / 0

NA / 0%

No

Evaluated

Full

15330011

6

pH

24 / 3

8.8

8.42

8.4

0 / NA

0% / NA

No

Evaluated

Full

15330011

6

Temperature

23 / 3

28.4

16.3

15.8

0 / 0

0% / 0%

No

Evaluated

Full


Class HH – Fish Tissue Sampling:

Site ID

Date

Species Name

Biopart

# in sample

Hg result

Hg violation?

Assessment Type

Support Level

202

8/30/2013

smallmouth bass

Plug

3

0.274

No

Evaluated

Full

202

9/9/2014

smallmouth bass

plug

4

0.215

No

Monitored

Full


Monitoring and Methods
Assessment Key Dates
8/30/2013
Fish Tissue Monitoring
9/9/2014
Fish Tissue Monitoring
4/4/2012
Fixed Monitoring Start Date
11/5/2014
Fixed Monitoring End Date
Methods
220
Non-fixed station physical/chemical monitoring (conventional pollutant only)
260
Fish tissue analysis
420
Indicator bacteria monitoring