Iowa DNR
ADBNet

Water Quality Assessments

Impaired Waters List

Buffalo Creek IA 01-WPS-378

from confluence with unnamed tributary in N 1/2 S27T88NR7W (Buchanan Co.) to confluence of the East Branch and West Branch of Buffalo Creek in S35 T90N R8W Buchanan Co.

Assessment Cycle
2022
Release Status
Final
Data Collection Period
Overall IR Category
3 - Insufficient data exist to determine whether any designated uses are met.
Trend
Unknown
Created
1/11/2022 1:13:42 PM
Updated
1/12/2022 3:37:54 PM
Assessment conducted in accordance with Iowa's 2022 IR methodology
Use Support
Class A1
Not Assessed
Class BWW2
WINOFI
Biological: low aquatic macroinvertebrate IBI
Support Level
Water in Need of Further Investigation (WINOFI)
Impairment Code
3b-c - Use potentially biologically impaired based on calibrated IBI metrics.
Cause Magnitude
Slight
Status
Continuing
Source
Unknown: Source Unknown
Source Confidence
Low
Cycle Added
2012
Impairment Rationale
Low Biotic Index
Data Source
Biological monitoring: Iowa DNR WQMA
Impairment Delistings
No delistings for this assessment cycle.
Documentation
Assessment Summary

The Class BWW2 use remains assessed as "WINOFI" 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

754

Buffalo Creek

Winthrop


Presumptive Class A1 - No Data


Class BWW2 - Biological Sampling:


Benthic Macroinvertebrates:

BioNet Site ID

Date

Drainage Area (mi2)

Ecoregion

Major Drainage

BM Sample Gear

BMIBI score

BMIBI Class

47c BMIBI BIT

BMIBI Pass/Fail

754

9/28/10

69

47c

MS

Art Sub

40

Fair

52

Fail


Fish:

BioNet Site ID

Date

Drainage Area (mi2)

Ecoregion

Major Drainage

Riffle Site?

FIBI score

FIBI Class

47c FIBI BIT

FIBI Pass/Fail

754

9/28/10

69

47c

MS

No

53

Good

44

Pass


Overall Assessment:

Community

Assessment Type

Assessment Result

Support Level

IR Category

Reason

Benthic Macroinvertebrates

Evaluated

Fail (0/1)

Not

Fish

Evaluated

Pass (1/1)

Full

Overall

Evaluated

Fail

WINOFI

3bc

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

Monitoring and Methods
Assessment Key Dates
9/28/2010 Biological Monitoring
Methods
150 Monitoring data more than 5 years old
315 Regional reference site approach
320 Benthic macroinvertebrate surveys
330 Fish surveys