Hecker Creek IA 01-YEL-447
mouth (T96N R06W Sec17 Allamakee Co.) to headwaters (Allamakee Co.)
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 6/10/2020 1:09:21 PM
- Updated
- 10/16/2020 7:21:32 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 remains assessed as “not supported” based on violations of Iowa’s aquatic life criteria for chloride, on multiple fish kill investigations, and based on biological sampling data. Note: A TMDL for the bacterial impairment for Yellow River basin streams was prepared by DNR in 2012 and was approved by U.S. EPA in February 2013. Due to TMDL completion, the Integrated Report category for the Class A1 recreational use was changed from 5p to 4a.
Data
Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY2006-2008 15030010 Hecker Creek at Co Rd W48 YRWP Iowa DNR 6 BIO See Below 158 Hecker Creek Postville Receiving Stream – W43 Bridge Presumptive Class A1 - Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2006-2008 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 15030010 6 49 / 3 2335 Yes 43 88% Yes Evaluated Not Presumptive
Class BWW1 - Chloride: 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 15030010 6 Chloride 54 / 3 1500 437 340 16 / 24 30% / 44% Yes Evaluated Not Presumptive
Class BWW1 - Biological Sampling: Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 52b BMIBI BIT BMIBI Pass/ Fail 158 7/24/07 5 52b MS/WW Hess 70 Good 61 Pass 158 7/31/06 5 52b MS/WW Surb 61 Good 61 Pass Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 52b FIBI BIT FIBI Pass/ Fail 158 7/24/07 5 52b MS/WW NA 30 Fair 52 Fail 158 7/31/06 5 52b MS/WW NA 54 Good 52 Pass Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (2/2) Full Fish Evaluated Fail (1/2) Partial Overall Evaluated Fail Partial 3bc 5bt Assessment is
evaluated because the samples included in the assessment weren’t collected in
the last five years. Presumptive
Class BWW1 – Fishkill Assessment: The presumptive Class BWW1 use assessment based on the
2000 fish kill placed this segment in Category 5b. The fish kill was caused by
a “pollutant” or was suspected to be caused by a “pollutant”; therefore, the
presumptive Class BWW1 use was considered impaired. Because the source of the
pollutant was not identified and/or the enforcement actions taken against the
responsible party have not been resolved, the presumptive Class BWW1 use was
placed in Category 5b. Due to uncertainty regarding the recovery of the aquatic
life following the fish kill, any existing fish kill 5b impairment will remain
in Category 5b until more recent sampling has shown recovery of the aquatic
community or the responsible party has paid restitution. Details about the 2000 fish kill can be found
here:https://programs.iowadnr.gov/fishkill/Events/462