Willow Creek IA 06-LSR-1626
mouth (S17 T94N R36W Clay Co.) to confluence with unnamed tributary in NW 1/4 S31 T95N R37W Clay Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:13:21 AM
- Updated
- 2/6/2024 9:05:57 AM
The presumptive Class A1 use was assessed as "not supported" due to violations of the state water quality criteria for indicator bacteria. The Class BWW2 use was assessed as “not 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 2010 11210003 Willow Creek near Royal Iowa DNR 6 BIO/WQ See Below 306 Willow Creek Rossie – REMAP #31 Site ID Data Source ID # Samples / # Years 2010 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 11210003 6 12 / 1 1113 Yes 10 77% Yes Evaluated Not BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47a BMIBI BIT BMIBI Pass/Fail 306 8/1/18 51 47a MO Hess 22 Poor 54 Fail BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47a FIBI BIT FIBI Pass/Fail 306 8/1/18 51 47a MO NA 41 Fair 43 Pass* 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 Not 5bt Assessment was evaluated because it was
based on a single sample. Site ID Data Source ID # Days Monitoring (2018) DO Criteria Type # 2018 violations / Violations needed for impairment Violates Annual Significantly >10% Rule? Assessment Type Support Level 24 hr 0/4 No 306 6 14 16 hr 0/4 No Evaluated Full
Presumptive Class A1 - Indicator Bacteria: 2010
Class BWW2 - Biological Sampling:
Benthic Macroinvertebrates:
Fish:
Overall:
Class BWW2 - Continuous DO Monitoring: 2018