Black Hawk Creek IA 02-CED-545
mouth (S22 T89N R13W Black Hawk Co.) to Hwy 58 in E 1/2 S27 T88N R14W Black Hawk Co.)
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
- Trend
- Unknown
- Created
- 6/25/2020 10:00:29 AM
- Updated
- 10/16/2020 9:04:39 AM
The Class A1 use was assessed as "partially supported" due to levels of indicator bacteria (E. coli) that violated state water quality standards. The Class BWW1 use was assessed as "fully supported" based on water quality data monitoring. The Class HH use was assessed as "fully supported" based on water quality monitoring data. Note: A TMDL for indicator bacteria in this segment of Black Hawk Creek was prepared by DNR and approved by EPA in 2006. Because all Section 303(d) impairments identified for this assessment/listing cycle (indicator bacteria) were addressed by the TMDL, this waterbody was placed in IR Category 4a (impaired; TMDL approved) of the current Integrated Report.
Sources of Data: Data Source Data Source ID Data Type Data Age Site ID BioNet Site ID Site Name Site Description Iowa DNR 6 WQ CY 2016-2018 10070004
Black Hawk Creek at Waterloo DNR
ambient station at Ridgeway Avenue SW of Waterloo Class A1 - Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2016 Geometric Mean 2017 Geometric Mean 2018 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10070004 6 22 / 3 357.51 616.85 571.42 Yes 16 73% Yes Monitored Partial 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 10070004 6 36 / 3 8.3 8.1 8.1 0 0% No Monitored Full 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 10070004 6 Ammonia 36 / 3 0.2 0.04 0.02 0 / 0 0% / 0% No Monitored Full 10070004 6 Chloride 36 / 3 33 22 22 0 / 0 0% / 0% No Monitored Full 10070004 6 Dissolved oxygen 36 / 3 14 10.3 10.4 NA / 0 NA / 0% No Monitored Full 10070004 6 pH 36 / 3 8.3 8.1 8.1 0 / NA 0% / NA No Monitored Full 10070004 6 Sulfate 36 / 3 33 18 18 0 / NA 0% / NA No Monitored Full 10070004 6 Temperature 36 / 3 23.5 11.4 11.7 0 / 0 0% / 0% No Monitored Full Class BWW1 - Toxic Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations % Acute/ Chronic Violations >1 Acute / Chronic Violation Assessment Type Support Level 10070004 6 Aluminum 9 / 2 4.2 1.437 1.2 0 / 0 0% / 0% No Evaluated Full 10070004 6 Arsenic 9 / 2 0.96 0.74 0.78 0 / 0 0% / 0% No Evaluated Full 10070004 6 Cadmium 9 / 2 0.025 0.025 0.025 0 / 0 0% / 0% No Evaluated Full 10070004 6 Chromium 9 / 2 1.2 0.79 0.78 0 / 0 0% / 0% No Evaluated Full 10070004 6 Copper 9 / 2 0.98 0.59 0.54 0 / 0 0% / 0% No Evaluated Full 10070004 6 Lead 9 / 2 0.12 0.054 0.05 0 / 0 0% / 0% No Evaluated Full 10070004 6 Nickel 9 / 2 2.3 2 2 0 / 0 0% / 0% No Evaluated Full 10070004 6 Selenium 9 / 2 2.2 1.55 1.5 0 / 0 0% / 0% No Evaluated Full 10070004 6 Zinc 9 / 2 4.4 1.8 1.1 0 / 0 0% / 0% No Evaluated Full Class HH-F - Toxic Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value Number of Non - Detects Mean Value > Criterion or MCL Assessment Type Support Level 10070004 6 Cadmium 9 / 2 0.025 0.025 0.025 9 No Evaluated Full 10070004 6 Chromium 9 / 2 1.2 0.79 0.78 0 No Evaluated Full 10070004 6 Copper 9 / 2 0.98 0.59 0.54 0 No Evaluated Full 10070004 6 Nickel 9 / 2 2.3 2 2 0 No Evaluated Full 10070004 6 Selenium 9 / 2 2.2 1.55 1.5 0 No Evaluated Full 10070004 6 Zinc 9 / 2 4.4 1.8 1.1 0 No Evaluated Full