North Branch Turkey River IA 01-TRK-223
mouth (S31 T99N R11W Howard Co.) to confluence with unnamed tributary (mouth located on left descending bank) in SE 1/4 S14 T99N R12W Howard Co
- Cycle
- 2026
- Current Phase
- Public Comment
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 10/27/2025 3:09:34 PM
- Updated
- 1/9/2026 2:24:29 PM
The presumptive Class A1 use remains assessed as “not supported” due to levels of indicator bacteria (E. coli) that 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 15450016 Turkey
River, North Brach at 115 St TRN10 Iowa DNR 6 BIO See Below 1023 North
Branch Turkey River Below
confluence with West Branch Turkey River 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 15450016 6 23 / 3 413 1062 214 Yes 16 70% Yes Evaluated Not Fish:
Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47c FIBI BIT FIBI Pass/Fail 1023 8/22/19 35 47c MS Undetermined 69 Excellent 44/65 Pass 1023 7/30/18 35 47c MS Undetermined 67 Excellent 44/65 Pass 1023 8/8/17 35 47c MS Undetermined 63 Excellent 44/65 Pass 1023 8/16/16 35 47c MS Undetermined 69 Excellent 44/65 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Fish Evaluated Pass (4/4) Full Assessment was evaluated because the assessment did not use multiple Overall Evaluated Pass Full 1 samples collected in a
recent five year period to complete the assessment.
Presumptive Class A1 – Indicator Bacteria: 2012-2014
Class BWW2 - Biological Sampling:
Overall: