Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

Tetes Des Morts Creek IA 01-TRK-121

mouth (Dubuque Co.) to confluence with Lux Cr. in S7 T87N R4E Jackson Co.

Cycle
2020
Release Status
Final
Overall IR
5 - Water is impaired or threatened and a TMDL is needed.
Trend
Unknown
Created
8/14/2020 9:23:04 AM
Updated
1/29/2021 9:44:30 AM
Use Support
Class A1
Recreation - Primary contact
Not Supported
Support Level
Not Supported
Impairment Code
5p - Impairment occurs on a waterbody with a presumptive A1 or B(WW1) use.
Cause Magnitude
High
Status
Continuing
Source
Unknown: Source Unknown
Source Confidence
N/A
Cycle Added
2012
Impairment Rationale
Geometric mean criterion exceeded
Data Source
Watershed project monitoring
TMDL Priority
Tier III
Class A2
Recreation - Secondary contact
Not Supported
Support Level
Not Supported
Impairment Code
5p - Impairment occurs on a waterbody with a presumptive A1 or B(WW1) use.
Cause Magnitude
Moderate
Status
Continuing
Source
Unknown: Source Unknown
Source Confidence
N/A
Cycle Added
2016
Impairment Rationale
Geometric mean criterion exceeded
Data Source
Watershed project monitoring
TMDL Priority
Tier III
Class BWW1
Aquatic Life - Warm Water Type 1
Partially Supported
Support Level
Partially Supported
Impairment Code
5b-v - Biological - verified
Cause Magnitude
Slight
Status
Continuing
Source
Unknown: Source Unknown
Source Confidence
Low
Cycle Added
2004
Impairment Rationale
Low Biotic Index
Data Source
Biological monitoring: Iowa DNR WQMA
TMDL Priority
Tier IV
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 presumptive Class A1 and the Class A2 uses remain assessed as “not supported” due to violations of Iowa water quality criteria for indicator bacteria (E. coli). The Class BWW1 use remains assessed as "partially supported" based on biological sampling data. The Class HH use remains assessed as "fully supported" based on fish tissue sampling data.

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 2010-2011

12490004

Tete des Morts at Hwy 52

Site 2

Iowa DNR

6

WQ

CY 2010-2011

13490002

Tete des Morts at High Bridge Road

Site 3

Iowa DNR

6

BIO

See Below

231

Tetes des Morts Creek

At St Donatus (original bio site)

Iowa DNR

6

FT

See Below

358

Tetes des Morts Creek

At St Donatus


Presumptive Class A1 - Indicator Bacteria: Historical

Site ID

Data Source ID

# Samples / # Years

2010 Geometric Mean

2011 Geometric Mean

Annual Geometric Mean Violation

# Violations

% Violations

Significantly >10% Violations

Assessment Type

Support Level

12490004

6

24 / 2

1578

822

Yes

20

83%

Yes

Evaluated

Not

13490002

6

21 / 2

713

106

Yes

8

37%

Yes

Evaluated

Partial


Class A2 - Indicator Bacteria: Historical

Site ID

Data Source ID

# Samples / # Years

2010 Geometric Mean

2011 Geometric Mean

Annual Geometric Mean Violation

# Violations

% Violations

Significantly >10% Violations

Assessment Type

Support Level

12490004

6

24 / 2

1578

822

Yes

5

21%

Yes

Evaluated

Not

13490002

6

21 / 2

713

106

Yes

2

10%

No

Evaluated

Partial


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

231

7/23/18

40

52b

MS/WW

Hess

56

Good

61

Fail

231

9/25/17

40

52b

MS/WW

Hess

54

Fair

61

Fail

231

9/13/16

40

52b

MS/WW

Hess

66

Good

61

Pass

231

8/20/14

40

52b

MS/WW

Hess

54

Fair

61

Fail

Fish:

BioNet Site ID

Date

Drainage Area (mi2)

Ecoregion

Major Drainage/ Thermal

Riffle Stream?

FIBI score

FIBI Class

52b FIBI BIT

FIBI Pass/ Fail

231

9/25/17

40

52b

MS/WW

NA

69

Good

52

Pass

231

9/14/16

40

52b

MS/WW

NA

67

Good

52

Pass

231

8/20/14

40

52b

MS/WW

NA

74

Excellent

52

Pass

Overall:

Community

Assessment Type

Assessment Result

Support Level

Earned IR Category

Actual IR Category

Reason

Benthic Macroinvertebrates

Monitored

Fail (1/4)

Partial

Fish

Monitored

Pass (3/3)

Full

Overall

Monitored

Fail

Partial

5bv

5bv

Assessment is monitored because there were two or more samples collected in the last five years.


Class HH – Fish Tissue Sampling:

Site ID

Date

Species Name

Biopart

# in sample

Hg result

Hg violation?

Assessment Type

Support Level

358

9/14/16

smallmouth bass

plug

3

0.143

No

Evaluated

Full

Monitoring and Methods
Assessment Key Dates
8/3/2010
Non-fixed Monitoring Start Date
11/1/2011
Non-fixed Monitoring End Date
8/20/2014
Biological Monitoring
9/13/2016
Biological Monitoring
9/14/2016
Biological Monitoring
9/14/2016
Fish Tissue Monitoring
9/25/2017
Biological Monitoring
7/23/2018
Biological Monitoring
Methods
150
Monitoring data more than 5 years old
220
Non-fixed station physical/chemical monitoring (conventional pollutant only)
260
Fish tissue analysis
315
Regional reference site approach
320
Benthic macroinvertebrate surveys
330
Fish surveys
420
Indicator bacteria monitoring