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 was assessed as “not supported” due to violations of Iowa water quality criteria for indicator bacteria (E. coli). The presumptive Class BWW1 use was assessed as "fully supported" based on the trout reproduction in Iowa streams summary prepared by the DNR Fisheries Bureau. 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.
Data Sources: 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) 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 Not
Aquatic Life Use - Trout Natural Reproduction
Based on the latest trout reproduction in Iowa streams summary prepared by the DNR Fisheries Bureau, the aquatic life use was assessed as "fully supported." According to the summary, a portion, or all, of this assessment unit 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 in Category II: streams that exhibit recent but inconsistent reproductive success of one or more trout species.
Presumptive Class A1 - Indicator Bacteria: Historical