Ten Mile Creek IA 01-UIA-274
mouth (S1 T98N R9W Winneshiek Co.) to confluence with Walnut Cr. in S18 T98N R9W Winneshiek Co.
- Cycle
- 2022
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/14/2021 2:52:44 PM
- Updated
- 1/6/2022 9:20:08 AM
The presumptive Class A1 use was assessed as “not supported” based on levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The Class A2 use was assessed as “fully supported” based on indicator bacteria (E. coli) monitoring data. The Class BCW1 use was assessed as "not supported" based on biological sampling data. All other designated uses were “not assessed.”
Data
Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 BIO See Below 476 Ten Mile Creek Decorah – REMAP #169 Iowa DNR 6 BIO See Below 829 Ten Mile Creek Ridgeway NEIARCD 19 WQ CY2012-2014 191910006 Ten Mile Creek Site 26 Presumptive
Class A1 - Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2012 Geometric Mean 2013 Geometric Mean 2014 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 191910006 19 21 / 3 110 315 506 Yes 12 57% Yes Evaluated Not Class
A2 - Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2012 Geometric Mean 2013 Geometric Mean 2014 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 191910006 19 21 / 3 110 315 506 No 3 14% No Evaluated Full Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 191910006 19 13 / 3 10.93 8.65 8.37 2 15% 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 191910006 19 Ammonia 14 / 3 0.18 0.06 0.05 0 / 0 0% / 0% No Evaluated Full 191910006 19 pH 13 / 3 10.93 8.65 8.37 2 / 0 15% / 0% No Evaluated Full 191910006 19 Temperature 14 / 3 21.1 14.7 16.4 NA / 0 NA / 0% No Evaluated Full Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal BM Sample Gear CBI score CBI Class CBI BIT CBI Pass/ Fail 476 8/12/14 29 52b MS/CW Hess 56 NA 60 Fail 476 8/7/13 13 52b MS/CW Hess 66 NA 60 Pass 829 8/16/11 29 52b MS/CW Hess 50 NA 60 Fail Overall
Assessment: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Fail (1/3) Not 5bv Assessment was evaluated because samples
used to complete assessment weren’t collected in the last five years.
Class BCW1-Natural Trout Reproduction: In contrast to the Benthic Macroinvertebrate data, based on the January 2021 summary of trout reproduction in Iowa
streams prepared by the DNR Fisheries Bureau, the Class BCW1 coldwater aquatic
life use of Ten Mile Creek was assessed as "fully supported.”
According to the updated summary, this stream was placed in Category II: streams that exhibit recent
but inconsistent reproductive success and occasional stocking may be needed to
maintain the trout population.
Class HH - No Data
Class A - pH:
Class BCW1 - Conventional Parameters:
Class BCW1 - Biological Sampling: