Morgan Creek IA 02-CED-513
mouth (S14 T83N R8W Linn Co.) to confluence with unnamed tributary in SW 1/4 S22 T83N R8W Linn Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:13:18 AM
- Updated
- 1/11/2024 1:28:49 PM
The presumptive Class A1 use remains assessed as “not supported” due to violations of Iowa water quality criteria for indicator bacteria (E. coli). The Class BWW2 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 CRWQ 23 WQ CY 2020-2022 99990089 Morgan
Creek
USGS 11 WQ CY 2020-2022 5464475 Morgan
Creek near Covington, IA
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 99990089 23 5/5/5 413 191 258 YES 3 / NA 3 / NA 3 / NA YES Eval Not 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 5464475 11 47 / 3 7.5 8.7 8 0 8 NO Mon Full 99990089 23 15 / 3 7.74 8.51 8.1 0 4 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 5464475 11 Chloride 13 / 2 34.9 198 53.9 NA 0 / 0 4 NO Mon Full 99990089 23 Chloride 15 / 3 25.7 39.7 32.5 NA 0 / 0 4 NO Mon Full 5464475 11 Dissolved Oxygen 35 / 3 6.8 15.2 11.1 0 NA / NA 7 NO Mon Full 99990089 23 Dissolved Oxygen 14 / 3 7.6 15.3 10.9 0 NA / NA 4 NO Mon Full 5464475 11 pH 47 / 3 7.5 8.7 8 0 NA / NA 8 NO Mon Full 99990089 23 pH 15 / 3 7.74 8.51 8.1 0 NA / NA 4 NO Mon Full 5464475 11 Sulfate 13 / 2 26.9 51.9 37.9 0 NA / NA 4 NO Mon Full 99990089 23 Sulfate 15 / 3 22.4 44.4 32.7 0 NA / NA 4 NO Mon Full 5464475 11 Temperature 35 / 3 0 24.4 9.6 0 NA / NA 7 NO Mon Full 99990089 23 Temperature 15 / 3 7.6 24.3 18.2 0 NA / NA 4 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 5464475 11 Ammonia 31 / 3 0.37 0.04 0.03 0 / 0 NO Mon Full
Presumptive Class A1 - Indicator Bacteria:
Presumptive Class A1 – pH:
Class BWW2 - Binomial Parameters:
Class BWW2 - Toxic Parameters: