West Fork Cedar River IA 02-WFC-801
from confluence with Shell Rock R. (S4 T90N R14W Black Hawk Co.) to confluence with Maynes Cr. in S7 T91N R17W Butler Co.
- Assessment Cycle
- 2024
- Release Status
- Pending
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:57 AM
- Updated
- 12/15/2023 12:30:16 PM
Assessment Summary
The Class A1 use was assessed as "not supported" due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW1 use was assessed as "fully supported" based on biological sampling data and water quality monitoring data. The Class HH use was assessed as “fully supported” based on water quality monitoring data.
Assessment Explanation
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2020-2022 10070003 West
Fork Cedar River at Finchford
Iowa DNR 6 BIO See Below 280 West
Fork Cedar River Finchford 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 10070003 6 8/8/8 71 121 272 YES 0 / 3 2 / 3 4 / 3 YES Mon 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 10070003 6 36 / 3 7.7 8.5 8.3 0 7 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 10070003 6 Chloride 36 / 3 14 24 18 NA 0 / 0 7 NO Mon Full 10070003 6 Dissolved Oxygen 36 / 3 7.6 14 10.5 0 NA / NA 7 NO Mon Full 10070003 6 pH 36 / 3 7.7 8.5 8.3 0 NA / NA 7 NO Mon Full 10070003 6 Sulfate 36 / 3 17 44 31 0 NA / NA 7 NO Mon Full 10070003 6 Temperature 36 / 3 0.1 27.3 11.5 0 NA / NA 7 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 10070003 6 Ammonia 36 / 3 0.15 0.03 0.02 0 / 0 NO Mon Full 10070003 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10070003 6 Chromium 20 / 3 1.2 0.6 0.5 0 / 0 NO Mon Full 10070003 6 Lead 20 / 3 1 0.91 1 0 / 0 NO Mon Full 10070003 6 Nickel 20 / 3 2.5 1.1 1 0 / 0 NO Mon Full 10070003 6 Selenium 18 / 2 2 0.7 0.5 0 / 0 NO Mon Full 10070003 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10070003 6 Zinc 20 / 3 2.7 0.9 0.5 0 / 0 NO Mon Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47c BMIBI BIT BMIBI Pass/Fail 280 8/25/22 850.3 47c MS Floating Art Sub 82 Excellent 52 Pass 280 8/15/18 850.3 47c MS Floating Art Sub 79 Excellent 52 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (2/2) Full Assessment was
evaluated because the drainage area of Overall Evaluated Pass Full 1 the sample site was greater than the
calibrated range. 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 10070003 6 Selenium 18 / 2 2 0.7 0.5 14 NO Mon Full
Class A1 - Indicator Bacteria:
Class A1 – pH:
Class BWW1 - Binomial Parameters:
Class BWW1 - Toxic Parameters:
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Overall:
Class HH-F - Toxic Parameters:
Assessment Key Dates
1/9/2020 | Monitoring Start |
12/8/2022 | Monitoring End |
8/15/2018 | Biological Monitoring |
8/25/2022 | Biological Monitoring |
Methods
200 | Physical/Chemical Monitoring |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |