Des Moines River IA 04-UDM-1214
from upper end of Saylorville Reservior to Fraser Dam in S34 T85N R27W Boone Co.
- Assessment Cycle
- 2024
- Release Status
- Pending
- Data Collection Period
- Overall IR Category
- 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
- Trend
- Stable
- Created
- 12/29/2023 1:37:09 PM
- Updated
- 12/29/2023 1:38:48 PM
| Cycle Added | Class | Cause | Data Source | Rationale |
|---|---|---|---|---|
| 2008 | Class A1 | Bacteria: Indicator Bacteria- E. coli | Ambient monitoring: Corps of Engineers/ISU/UI | New data: WQ improvement (chemical / physical / bacterial) |
Assessment Summary
The Class A1 use was assessed as "fully supported" based on water quality monitoring data. The Class BWW1 use was assessed as "fully supported" based on water quality monitoring data. All other designated uses were "not assessed."
Assessment Explanation
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description USACE 12 WQ CY 2020-2022 17080001 Des
Moines River at E26
Site ID Data Source ID # Samples per Year (2020/ 2021/2022) 2020 Geometric Mean 2021 Geometric Mean 2022 Geometric Mean Violates Annual Geometric Mean? # 2020 SSM violations / SSM Violations needed for impairment # 2021 SSM violations / SSM Violations needed for impairment # 2022 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 17080001 12 10/10/10 52 50 73 NO 1 / 3 0 / 3 1 / 3 NO Mon Full Site ID Data Source ID # Samples / # Years Minimum Value Maximum Value Mean Value # Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 17080001 12 59 / 3 6.57 8.97 8.25 0 10 NO Mon Full Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Mean Value # Violations # Acute / Chronic Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 17080001 12 Dissolved Oxygen 59 / 3 5.8 15.9 10.1 0 NA / NA 10 NO Mon Full 17080001 12 pH 59 / 3 6.57 8.97 8.25 0 NA / NA 10 NO Mon Full 17080001 12 Temperature 59 / 3 0.3 27.6 14.2 0 NA / NA 10 NO Mon Full Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations >1 Acute / Chronic Violation Assessment Type Support Level 17080001 12 Ammonia 18 / 1 0.005 0 0 0 / 0 NO Mon Full
Class A1 - Indicator Bacteria:
Class A1 – pH:
Class BWW1 - Binomial Parameters:
Class BWW1 - Toxic Parameters:
Class HH - No Data
Assessment Key Dates
| 12/5/2022 | Monitoring End |
| 1/6/2020 | Monitoring Start |
Methods
| 200 | Physical/Chemical Monitoring |
| 420 | Indicator bacteria monitoring |