Coldwater Creek IA 01-UIA-280
mouth (S32 T100N R9W Winneshiek Co.) to north line of S31 T100N R9W Winneshiek Co.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 8/25/2020 5:47:09 AM
- Updated
- 10/15/2020 11:43:12 AM
The presumptive Class A1 and the presumptive 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 remains 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".
Sources
of Data: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 BIO See Below 18 Coldwater Creek Coldwater Creek SWMA - Bluffton NEIARCD 19 WQ CY2012-2014 191910003 Coldwater Creek Site 9 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 191910003 19 21
/ 3 131 188 1231 Yes 9 43% Yes Evaluated Not Presumptive 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 191910003 19 21
/ 3 131 188 1231 Yes 4 19% No Evaluated Not Class A - pH: 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 Class BCW1 - Conventional
Parameters: 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 Class
BCW1 - Biological Sampling: 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 18 9/21/16 22 52b MS/CW Hess 61 NA 60 Pass 18 7/19/16 22 52b MS/CW Hess 67 NA 60 Pass 18 8/16/11 22 52b MS/CW Hess 81 NA 60 Pass Overall
Assessment: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic Macroinvertebrates Evaluated Pass (3/3) Full 1 1 Assessment
is evaluated because samples used to complete assessment weren’t collected in
the last five years. Class BCW1 – Trout Natural Reproduction: Based on the January 2020 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