Coldwater Creek IA 01-UIA-280
mouth (S32 T100N R9W Winneshiek Co.) to north line of S31 T100N R9W Winneshiek Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:41 AM
- Updated
- 2/6/2024 10:50:40 AM
The presumptive Class A1 and the Class A2 uses remain assessed as “not supported” due to levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The Class BCW1 use was assessed as "fully supported" based on biological sampling data, water quality monitoring data, and on the trout reproduction in Iowa streams summary prepared by the DNR Fisheries Bureau. 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/WQ See Below 18 Coldwater
Creek Coldwater
Creek SWMA - Bluffton Iowa DNR 6 WQ CY 2012-2014 191910003 Coldwater
Creek Site
9 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 191910003 19 21 / 3 131 188 1231 Yes 9 43% Yes Evaluated Not 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 191910003 19 21 / 3 131 188 1231 Yes 4 19% No Evaluated Not Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 191910003 19 13 / 3 10.38 8.53 8.29 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 191910003 19 Ammonia 14 / 3 0.08 0.05 0.05 0 / 0 0% / 0% No Evaluated Full 191910003 19 pH 13 / 3 10.38 8.53 8.29 2 / 0 15% / 0% No Evaluated Full 191910003 19 Temperature 14 / 3 20.6 13.6 14.2 NA / 0 NA / 0% No Evaluated Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear CBI score CBI Class CBI BIT CBI Pass/ Fail 18 8/4/20 22.4 52b MS Hess 62 NA 60 Pass 18 9/21/16 22.4 52b MS Hess 61 NA 60 Pass 18 7/19/16 22.4 52b MS Hess 70 NA 60 Pass Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (3/3) Full Assessment was evaluated because the assessment usedsamples Overall Evaluated Pass Full 1 collected outside a
recent five year period to complete the assessment. Class BCW1 - Continuous
DO Monitoring: Site ID Data Source ID # Days Monitoring (2016) DO Criteria Type # 2016 violations/Violations needed for
impairment Violates Annual Significantly >10% Rule? Assessment Type Support Level 24 hr 1/7 No 18 6 39 16 hr 0/7 No Evaluated Full
Class BCW1 – Trout
Natural Reproduction: 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 Coldwater Creek was
assessed as "fully supported." According to the updated summary, this
stream was placed in both Category I: streams that exhibit consistent natural
reproduction and maintain a wild population of one or more trout species
without any stocking and 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
Presumptive Class A1 - Indicator Bacteria:
Class A2 - Indicator Bacteria:
Class A - pH:
Class BCW1 - Binomial Parameters:
Class BCW1 - Biological Sampling:
Benthic Macroinvertebrates: