Iowa DNR
Iowa DNR

ADBNet

Water Quality Assessments
Impaired Waters List

Bear Creek IA 02-IOW-702

from confluence with L. Bear Cr. (S16 T80N R13W Poweshiek Co.) to confluence with unnamed tributary in SW 1/4 S9 T80N R14W Poweshiek Co.

This is a DRAFT assessment
Draft assessments may change without notice
Overall IR
2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
Trend
Stable
Current Phase
Public Comment
Created
10/27/2025 3:09:24 PM by
Updated
1/12/2026 2:59:34 PM by
Use Support
Class A1
Recreation - Primary contact
Not Assessed
Class BWW2
Aquatic Life - Warm Water Type 2
Fully Supported
No delistings for this assessment cycle.
Documentation
Assessment Summary

The Class BWW2 use was assessed as “fully supported” based on biological sampling 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

328

Bear Creek

Brooklyn – REMAP #56


Presumptive Class A1 – No Data

Class BWW2 - 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

328

8/10/22

64.3

47f

MS

Art Sub

51

Fair

51

Pass

328

8/28/19

64.3

47f

MS

Art Sub

52

Fair

51

Pass


Fish:

Site ID

Date

Drainage Area (mi2)

Ecoregion

Major Drainage

Riffle Stream?

FIBI score

FIBI Class

47f FIBI BIT

FIBI Pass/Fail

328

8/10/22

64.3

47f

MS

NA

44

Fair

36

Pass

328

8/28/19

64.3

47f

MS

NA

37

Fair

36

Pass


Overall:

Community

Assessment Type

Assessment Result

Support Level

IR Category

Reason

Benthic Macroinvertebrates

Monitored

Pass (2/2)

Full

Fish

Monitored

Pass (2/2)

Full

Assessment was monitored because it was completed

Overall

Monitored

Pass

Full

1

using samples collected in a recent five-year period.


Class BWW2 - Continuous DO Monitoring:

Site ID

Data Source ID

# Days Monitoring (2019)

DO Criteria Type

# 2019 violations / Violations needed for impairment

Violates Annual Significantly >10% Rule?

Assessment Type

Support Level

24 hr

0/4

No

328

6

13

16 hr

0/4

No

Evaluated

Full

Monitoring and Methods
Assessment Key Dates
8/28/2019
Biological Monitoring
8/10/2022
Biological Monitoring
8/14/2019
Monitoring Start
8/28/2019
Monitoring End
Methods
315
Regional reference site approach
320
Benthic macroinvertebrate surveys
330
Fish surveys