Hickory Creek IA 01-YEL-441
mouth (NE 1/4 S23 T96N R5W Allamakee Co.) to south line of S28 T96N R5W Allamakee Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:13:48 AM
- Updated
- 2/6/2024 7:34:33 AM
| Cycle Added | Class | Cause | Data Source | Rationale |
|---|---|---|---|---|
| 2008 | Class BCW1 | Organic Enrichment: Low Dissolved Oxygen | Ambient monitoring: Iowa DNR-rivers | New data: WQ improvement (chemical / physical / bacterial) |
The presumptive Class A1 use was assessed as “not supported” due to levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The Class A2 use was assessed as “fully supported” based on pH monitoring data. The Class BCW1 use was assessed as "fully supported" based on water quality monitoring and on the trout reproduction in Iowa streams summary prepared by the DNR Fisheries Bureau. All other designated uses were “not assessed.” Note: A TMDL for the bacterial impairment for streams in the Yellow River basin was prepared by Iowa DNR in 2012 and was approved by U.S. EPA in February 2013. Due to completion of the TMDL, the Integrated Report category for the Class A1 recreational use was changed from 5p (impaired; TMDL needed) to 4a (impaired; TMDL approved).
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2008-2009, CY 2021-2022 15030007 Hickory
Creek at Hickory Creek Rd.
Site ID Data Source ID # Samples / # Years 2008 Geometric Mean 2009 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 15030007 6 15 / 2 696 422 Yes 13 86% Yes Evaluated Not 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 15030007 6 10 / 2 7.57 8.37 8 0 3 NO Mon Full 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 15030007 6 Dissolved Oxygen 10 / 2 10.17 13.99 11.04 0 NA / NA 3 NO Mon Full 15030007 6 pH 10 / 2 7.57 8.37 8 0 NA / NA 3 NO Mon Full 15030007 6 Temperature 10 / 2 7.75 14.72 12.02 0 NA / NA 3 NO Mon Full Based on the January 2024 trout reproduction in Iowa streams summary prepared
by the DNR Fisheries Bureau, the Class BCW1 coldwater aquatic life use of
Hickory Creek was assessed as "fully supported." According to the
updated summary, this stream was placed in Category I: streams that exhibit
consistent natural reproduction and maintain a wild population of one or more
trout species without any stocking. Class HH - No Data
Presumptive Class A1 - Indicator Bacteria: 2008-2009
Class A2 – Indicator Bacteria: No Data
Presumptive Class A1 and Class A2 – pH: 2021-2022
Class BCW1 - Binomial Parameters: 2021-2022
Class BCW1 – Trout Natural Reproduction: