Brush Creek IA 01-VOL-317
mouth (S26 T93N R7W Fayette Co.) to confluence with Bear Cr. in S8 T92N R7W Fayette Co.
- Cycle
- 2026
- Current Phase
- Public Comment
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Stable
- Created
- 10/27/2025 3:09:29 PM
- Updated
- 12/2/2025 9:28:20 AM
The presumptive Class A1 use remains assessed as “not supported" due to levels of indicator bacteria (E. coli) that slightly exceeded state water quality criteria. The Class BWW2 use was assessed as "fully supported" based on biological sampling data.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2012-2014 15330002 Brush Creek at Bush
Road/C24 BRU10 Iowa DNR 6 BIO See Below 165 Brush Creek Wadena 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 15330002 6 24 / 3 113 211 38 Yes 4 17% No Evaluated Not Benthic Macroinvertebrates: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 52b BMIBI BIT BMIBI Pass/Fail 165 7/30/24 31.7 52b MS Hess 81 Excellent 61 Pass 165 9/2/20 31.7 52b MS Hess 75 Good 61 Pass Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 52b FIBI BIT FIBI Pass/Fail 165 7/30/24 31.7 52b MS NA 90 Excellent 52 Pass 165 9/3/20 31.7 52b MS NA 78 Excellent 52 Pass 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 the assessment was Overall Monitored Pass Full 1 based on samples collected in a recent five-year period.
Presumptive Class A1 – Indicator Bacteria: 2012-2014
Class BWW2 - Biological Sampling:
Fish:
Overall: