Duck Creek IA 01-UIA-254
mouth (NE 1/4 S14 T100N R6W Allamakee Co.) to IA/MN state line (S11 T100N R6W Allamakee Co.).
The presumptive Class A1 use remains assessed as “partially supported” due to violations of Iowa water quality criteria for indicator bacteria (E. coli). The presumptive Class A2 use remains assessed as "fully supporting" based on historical indicator bacteria (E. coli) monitoring data. The presumptive Class BWW1 use remains assessed as "fully supported" based on the trout reproduction in Iowa streams summary prepared by the DNR Fisheries Bureau and on water quality monitoring data. Although not designated for coldwater aquatic life uses in the Iowa Water Quality Standards/Surface Water Classification, this stream is considered a trout stream by the DNR Fisheries Bureau and is identified as an "Outstanding Iowa Water" as part of Iowa's anti-degradation program. Thus, this stream segment is assessed as a coldwater stream for the Iowa’s Integrated Reporting cycle.
Sources
of Data: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2010-2011 13030001 Duck Creek at Waterloo Creek Dr (Site Duck
1) Presumptive
Class A1 - Indicator Bacteria: Historical Site ID Data Source ID # Samples / # Years 2010 Geometric Mean 2011 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 13030001 6 30 / 2 530 90 Yes 16 53% Yes Evaluated Partial Presumptive
Class A2 - Indicator Bacteria: Historical Site ID Data Source ID # Samples / # Years 2010 Geometric Mean 2011 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 13030001 6 30 / 2 530 90 No 4 13% No Evaluated Full Presumptive Class
BWW1 - Conventional Parameters: Historical Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value # Acute / Chronic Violations % Acute/ Chronic Violations Significantly >10% Violations Assessment Type Support Level 13030001 6 Dissolved oxygen 11 / 1 7.0 NA / 0 NA / 0% No Evaluated Full 13030001 6 Temperature 11 / 1 NA 0 / 0 0% / 0% No Evaluated Full Presumptive Class BWW1– 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 Duck Creek was assessed as "fully supported". According to the updated summary, this stream has reaches that are 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(s).