Robin Creek IA 01-NEM-6373
from mouth (SW1/4 S14 T78N R3E Scott Co.) to headwaters in SW1/4 S10 T78N R3E Scott 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 3:11:31 PM
- Updated
- 12/12/2025 11:06:50 AM
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 presumptive class BWW1 use was assessed as "fully supported" based on water quality data. Note: A TMDL for the bacterial impairment for streams in the Duck Creek basin was prepared by Iowa DNR in March 2010 and was approved by U.S. EPA in 2011. According to U.S. EPA, however, the TMDL for the Duck Creek watershed does not assign the required elements to Robin Creek; thus, this stream remains Section 303(d) impaired and in Category 5p of Iowa's Integrated Report.
Data Sources:
Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2008 11820007 Robin
Creek site along W 35th st. (RC1A)
Iowa DNR 6 WQ CY 2013 11820010 Robin
Creek (rc1a)
Iowa DNR 6 WQ CY 2024 11820007 Robin
Creek site along W 35th st. (RC1A)
Site ID Data Source ID # Samples / # Years 2008 Geometric Mean 2013 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 11820007 6 29 / 1 1308 NA Yes 26 90% Yes Evaluated Not 11820010 6 6 / 1 NA 895 Yes 4 67% Yes Evaluated Not Presumptive Class A1 - Indicator Bacteria: Site ID Data Source ID # Samples per Year (2022/ 2023/2024) 2022 Geometric Mean 2023 Geometric Mean 2024 Geometric Mean Violates Annual Geometric Mean? # 2022 SSM violations / SSM Violations needed for impairment # 2023 SSM violations / SSM Violations needed for impairment # 2024 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 11820007 6 0/0/15 NA NA 737 YES NA NA 12 / 4 YES MONITORED NOT Presumptive Class A1 - pH Site ID Data Source ID # Samples / # Years Minimum Value Maximum Value Mean Value # Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 11820007 6 16 / 1 7.3 8.6 7.8 0 4 NO MONITORED FULL Presumptive Class BWW1 - Binomial Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Mean Value # Violations # Acute / Chronic Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 11820007 6 Dissolved Oxygen 16 / 1 4.3 14.7 9 1 NA / NA 4 NO MONITORED FULL 11820007 6 pH 16 / 1 7.3 8.6 7.8 0 NA / NA 4 NO MONITORED FULL 11820007 6 Temperature 16 / 1 6.57 27.78 18.59 0 NA / NA 4 NO MONITORED FULL
Presumptive Class A1 - Indicator Bacteria: Historical