Deer Creek IA 02-CED-591
mouth (S23 T99N R18W Mitchell Co.) to the Mitchell-Worth county line (west line S6 T100N R18W Mitchell Co.)
- Cycle
- 2026
- Current Phase
- Public Comment
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Declining
- Trend Comment
- New Class BWW2 benthic macroinvertebrate Category 5 impairment.
- Created
- 10/27/2025 3:09:36 PM
- Updated
- 12/1/2025 3:57:17 PM
The presumptive Class A1 use was assessed as “not supported" due to levels of indicator bacteria (E. coli) that slightly exceeded state criteria. 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 CEDARMIT 21 WQ CY 2016-2017 15660007 Deer Creek At Dancer Ave Iowa DNR 6 BIO See Below 29 Deer Creek Carpenter – 1 mi NW Site ID Data Source ID # Samples / # Years 2016 Geometric Mean 2017 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 15660007 21 14 / 2 166 168 Yes 8 57% Yes Evaluated Not Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 15660007 21 14 / 2 8.4 8.3 8.3 0 0% No Evaluated Full Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations % Acute/ Chronic Violations Significantly >10% Violations Assessment Type Support Level 15660007 21 Dissolved oxygen 10 / 2 12.8 9.7 9.8 NA / 0 NA / 0% No Evaluated Full 15660007 21 pH 14 / 2 8.4 8.3 8.3 0 / NA 0% / NA No Evaluated Full 15660007 21 Temperature 14 / 2 23.8 15.8 16.9 0 / 0 0% / 0% No Evaluated Full BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear BMIBI score BMIBI Class 47c BMIBI BIT BMIBI Pass/Fail 29 8/15/24 90.4 47c MS/WW Hess 41 Fair 70 Fail 29 9/8/23 90.4 47c MS/WW Surber 61 Good 70 Fail 29 7/21/21 90.4 47c MS/WW Hess 79 Excellent 70 Pass BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal Riffle Stream? FIBI score FIBI Class 47c FIBI BIT FIBI Pass/Fail 29 7/21/21 90.4 47c MS/WW Yes 74 Excellent 65 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Monitored Fail (1/3) Not Fish Evaluated Pass (1/1) Full Assessment was
monitored because the samples used for Overall Monitored Fail Not 5bv the (BMIBI) assessment
were collected in a recent five year period.
Presumptive Class A1 - Indicator Bacteria:
Presumptive Class A1 - pH:
Class BWW2 - Binomial Parameters:
Class BWW2 - Biological Sampling:
Benthic Macroinvertebrates:
Fish:
Overall: