Cedar Creek IA 03-SKU-905
mouth (S9 T71N R7W Henry Co.) to confluence with Little Cedar Cr. in S17 T70N R7W Henry Co.
- Assessment Cycle
- 2022
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/22/2021 11:40:06 AM
- Updated
- 1/25/2022 1:22:01 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 continuous DO 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 Iowa DNR 6 WQ CY 2018-2020 10440001 Cedar Creek near Oakland Mills
Iowa DNR 6 BIO See Below 194 Big Cedar Creek Gibson Rec Area – Oakland Mills Class A1 -
Indicator Bacteria: Site ID Data Source ID # Samples per Year (2018/ 2019/2020) 2018 Geometric Mean 2019 Geometric Mean 2020 Geometric Mean Violates Annual Geometric Mean? # 2018 SSM violations / SSM Violations
needed for impairment # 2019 SSM violations / SSM Violations
needed for impairment # 2020 SSM violations / SSM Violations
needed for impairment Violates Annual SSM Significantly >10%
Rule? Assessment Type Support Level 10440001 6 8/8/8 82 255 172 YES 2 / 3 4 / 3 3 / 3 YES Monitored Not Class A - pH 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 6.8 8.5 7.9 0 7 NO Monitored Full Class BWW1 -
Conventional Parameters: 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 Ammonia 36 / 3 0.02 0.75 0.11 NA 0 / 0 7 NO Monitored Full 10440001 6 Chloride 36 / 3 7.4 61 28.9 NA 0 / 0 7 NO Monitored Full 10440001 6 Dissolved Oxygen 36 / 3 6.2 13.8 10.1 0 NA / NA 7 NO Monitored Full 10440001 6 pH 36 / 3 6.8 8.5 7.9 0 NA / NA 7 NO Monitored Full 10440001 6 Sulfate 36 / 3 11 210 56 0 NA / NA 7 NO Monitored Full 10440001 6 Temperature 36 / 3 0.1 31.8 12.5 0 NA / NA 7 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 >1 Acute / Chronic Violation Assessment Type Support Level 10440001 6 Aluminum 14 / 3 19 2.526 0.32 0 / 0 NO Monitored Full 10440001 6 Arsenic 13 / 3 3.2 1.4 1.1 0 / 0 NO Monitored Full 10440001 6 Cadmium 13 / 3 0.07 0.04 0.02 0 / 0 NO Monitored Full 10440001 6 Chromium 13 / 3 1.3 0.7 0.7 0 / 0 NO Monitored Full 10440001 6 Lead 13 / 3 0.44 0.16 0.12 0 / 0 NO Monitored Full 10440001 6 Nickel 13 / 3 5.5 3.6 3.5 0 / 0 NO Monitored Full 10440001 6 Silver 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10440001 6 Zinc 13 / 3 4.2 2.2 2.2 0 / 0 NO Monitored Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 40a BMIBI BIT BMIBI Pass/Fail 194 8/13/18 533 40a MS Hess 56 Good 41 Pass 194 10/4/16 533 40a MS Hess 57 Good 41 Pass 194 10/4/16 533 40a MS Floating Art Sub 39 Fair 41 Fail 194 9/6/16 533 40a MS Hess 57 Good 41 Pass 194 9/6/16 533 40a MS Floating Art Sub 57 Good 41 Pass Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (4/5) Full Assessment was evaluated
because the drainage area of the sample site Overall Evaluated Pass Full 1 was greater than the
calibrated range. Site ID Data Source ID # Days Monitoring (2016/2017/2018/ 2019/2020) DO Criteria Type # 2016 violations /
Violations needed for impairment # 2017 violations /
Violations needed for impairment # 2018 violations
/ Violations needed for impairment # 2019 violations /
Violations needed for impairment # 2020 violations /
Violations needed for impairment Violates Annual Significantly >10% Rule? Assessment Type Support Level
24 hr 1/4 NA NA NA NA No
194 6 14/0/0/0/0 16 hr 0/4 NA NA NA NA No Evaluated Full
Class
BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Class BWW1 – Continuous Monitoring:
Class HH – No Data
Assessment Key Dates
9/6/2016 | Biological Monitoring |
10/4/2016 | Biological Monitoring |
1/4/2018 | Fixed Monitoring Start Date |
12/9/2020 | Fixed Monitoring End Date |
7/3/2012 | Non-fixed Monitoring Start Date |
7/31/2012 | Non-fixed Monitoring End Date |
8/13/2018 | Biological Monitoring |
Methods
150 | Monitoring data more than 5 years old |
222 | Non-fixed-station monitoring (conventional during key seasons and flows) |
230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |