Cedar Creek IA 03-SKU-905
mouth (S9 T71N R7W Henry Co.) to confluence with Little Cedar Cr. in S17 T70N R7W Henry 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 8:12:52 AM
- Updated
- 1/16/2024 8:42:12 AM
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.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description Iowa DNR 6 WQ CY 2020-2022 10440001 Cedar
Creek near Oakland Mills
Iowa DNR 6 BIO See Below 194 Cedar
Creek Gibson
Rec Area - Oakland Mills 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 10440001 6 8/8/8 172 247 104 YES 3 / 3 4 / 3 1 / 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 10440001 6 36 / 3 7.6 8.8 8.2 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 10440001 6 Chloride 36 / 3 13 75 32 NA 0 / 0 7 NO Mon Full 10440001 6 Dissolved Oxygen 36 / 3 6.4 17.7 10.8 0 NA / NA 7 NO Mon Full 10440001 6 pH 36 / 3 7.6 8.8 8.2 0 NA / NA 7 NO Mon Full 10440001 6 Sulfate 36 / 3 19 200 64 0 NA / NA 7 NO Mon Full 10440001 6 Temperature 36 / 3 0.2 32.3 13.4 1 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 10440001 6 Ammonia 36 / 3 0.53 0.07 0.02 0 / 0 NO Mon Full 10440001 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10440001 6 Chromium 20 / 3 2 0.64 0.5 0 / 0 NO Mon Full 10440001 6 Lead 20 / 3 1 0.9 1 0 / 0 NO Mon Full 10440001 6 Nickel 20 / 3 3.5 2.2 2.2 0 / 0 NO Mon Full 10440001 6 Selenium 18 / 2 2 0.8 0.5 0 / 0 NO Mon Full 10440001 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10440001 6 Zinc 20 / 3 2.7 1 0.5 0 / 0 NO Mon Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 40a BMIBI BIT BMIBI Pass/Fail 194 7/19/22 533.2 40a MS Hess 65 Good 41 Pass 194 8/13/18 533.2 40a MS Hess 56 Good 41 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 the site Overall Evaluated Pass Full 1 used for the assessment was greater than the
calibrated range. Site ID Data Source ID # Days Monitoring (2016) DO Criteria Type # 2016 violations / Violations needed for impairment Violates Annual Significantly >10% Rule? Assessment Type Support Level 24 hr 1/4 No 194 6 14 16 hr 0/4 No Evaluated Full 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 10440001 6 Selenium 18 / 2 2 0.8 0.5 13 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 BWW1 – Continuous Monitoring:
Class HH-F - Toxic Parameters: