Dry Run Creek IA 01-UIA-6552
from west line of section (T98N R9W Sec36) to headwaters (T98N R9W Sec29) Winneshiek Co.
The presumptive Class A1 use was assessed as "not supported" due to levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The presumptive Class BWW1 use was assessed as "fully supported" based on water quality monitoring data.
Data
Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2010-2011 15960026 Dry Run Creek Watershed Site 14 Iowa DNR 6 WQ CY 2010 15960027 Dry Run Creek Watershed Site 15 Presumptive
Class A1 - Indicator Bacteria: 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 15960026 6 28 / 2 1708 1985 Yes 25 89% Yes Evaluated Not 15960027 6 13 / 1 1279 NA Yes 11 85% Yes Evaluated Not The monitoring conducted as part of this watershed
study included sampling for indicator bacteria (E. coli) immediately (within
24 hours) following rainfall runoff events. About half the samples in each of
2010 and 2011 were collected under such conditions. See the following journal
article for more information: Wittman et al. 2013. Evaluation of land use and
water quality in an agricultural watershed in the USA indicates multiple
sources of bacterial impairment. Environ. Monit. Assess. (2013) 185:10395-10429. Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 15960026 6 27 / 2 8.4 7.8 7.9 1 4% No Evaluated Full 15960027 6 12 / 1 7.8 7.5 7.5 0 0% No Evaluated Full Presumptive
Class BWW1 - 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 15960026 6 Ammonia 26 / 2 0.16 0.06 0.05 0 / 0 0% / 0% No Evaluated Full 15960026 6 Dissolved oxygen 32 / 2 13.1 9.3 9.3 NA / 1 NA / 3% No Evaluated Full 15960026 6 pH 27 / 2 8.4 7.8 7.9 1 / NA 4% / NA No Evaluated Full 15960026 6 Temperature 32 / 2 24.6 16.2 16.6 0 / 0 0% / 0% No Evaluated Full 15960027 6 Ammonia 11 / 1 0.05 0.05 0.05 0 / 0 0% / 0% No Evaluated Full 15960027 6 Dissolved oxygen 13 / 1 10.6 7.3 6.9 NA / 1 NA / 8% No Evaluated Full 15960027 6 pH 12 / 1 7.8 7.5 7.5 0 / NA 0% / NA No Evaluated Full 15960027 6 Temperature 13 / 1 20.6 14.9 15.8 0 / 0 0% / 0% No Evaluated Full
Presumptive Class A1 - pH: