Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

Troublesome Creek IA 03-NSK-1862

mouth (T76N R11W Sec11 Keokuk Co.) to headwaters (T77N R11W Sec26 Keokuk Co.)

Cycle
2024
Release Status
Final
Overall IR
3 - Insufficient data exist to determine whether any designated uses are met.
Trend
Unknown
Created
11/1/2023 8:12:22 AM
Updated
2/1/2024 11:38:10 AM
Use Support
Class A1
Recreation - Primary contact
Not Assessed
Class BWW1
Aquatic Life - Warm Water Type 1
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
2006
Impairment Rationale
Potential Impairment
Data Source
Biological monitoring: Iowa DNR WQMA
Impairment Code
3b - Use potentially impaired based on an evaluated assessment.
Cause Magnitude
Slight
Status
Continuing
Source
Unknown: Source Unknown
Source Confidence
N/A
Cycle Added
2022
Impairment Rationale
Potential Impairment
Data Source
Ambient monitoring: Iowa DNR-continuous
Impairment Delistings
No delistings for this assessment cycle.
Documentation
Assessment Summary

The presumptive Class BWW1 use was assessed as “WINOFI” based on biological sampling data and continuous dissolved oxygen monitoring data. All other designated uses were "not assessed."

Assessment Explanation

Data Sources:

Data Source

Data Source ID

Data Type

Data Age

Site ID

Site Name

Site Description

Iowa DNR

6

BIO

See Below

363

Troublesome Creek

South English – REMAP #78

Iowa DNR

6

WQ

2020

363

Troublesome Creek

South English – REMAP #78


Presumptive Class A1 – No Data

Presumptive Class BWW1 - Biological Sampling:


Benthic Macroinvertebrates:

Site ID

Date

Drainage Area (mi2)

Ecoregion

Major Drainage

BM Sample Gear

BMIBI score

BMIBI Class

47f BMIBI BIT

BMIBI Pass/Fail

363

8/11/20

4.2

47f

MS

Art Sub

41

Fair

51

Fail


Fish:

Site ID

Date

Drainage Area (mi2)

Ecoregion

Major Drainage

Riffle Stream?

FIBI score

FIBI Class

47f FIBI BIT

FIBI Pass/Fail

363

8/11/20

4.2

47f

MS

NA

22

Poor

36

Fail


Overall:

Community

Assessment Type

Assessment Result

Support Level

IR Category

Reason

Benthic Macroinvertebrates

Evaluated

Fail (0/1)

WINOFI

Fish

Evaluated

Fail (0/1)

WINOFI

Assessment was evaluated because it was based on a single sample and

Overall

Evaluated

Fail

WINOFI

3bu

the drainage area of the sample site was smaller than calibrated range.


Class BWW1- Continuous DO Monitoring:

Site ID

Data Source ID

# Days Monitoring (2020)

DO Criteria Type

# 2020 violations / Violations needed for impairment

Violates Annual Significantly >10% Rule?

Assessment Type

Support Level

24 hr

7/4

No

363

6

16

16 hr

3/4

No

Evaluated

WINOFI

Monitoring and Methods
Assessment Key Dates
8/11/2020
Biological Monitoring
7/27/2020
Monitoring Start
8/11/2020
Monitoring End
Methods
200
Physical/Chemical Monitoring
315
Regional reference site approach
320
Benthic macroinvertebrate surveys
330
Fish surveys