Wapsipinicon River IA 01-WPS-332
mouth (Scott-Clinton county line) to confluence with Silver Cr. in NW 14 S6 T80N R4E Clinton 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
- 12/17/2021 1:39:10 PM
- Updated
- 1/5/2022 1:41:33 PM
Assessment Summary
The Class A1 use was assessed as "not supported" due to levels of indicator bacteria (E. coli) that exceeded Class A1 criteria. The Class BWW1 use was assessed as "fully supported" based on biological sampling data and 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 Iowa DNR 6 BIO See Below 844 Wapsipinicon River at De Witt
Iowa DNR 6 WQ CY 2018-2020 10820001 Wapsipinicon River at De Witt
LTRMP 17 WQ CY 2018-2020 99990006 Wapsipinicon River
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 10820001 6 8/8/8 241 227 104 YES 5 / 3 3 / 3 2 / 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 10820001 6 36 / 3 6.8 8.6 8 0 7 NO Monitored Full 99990006 17 41 / 3 3.4 8.5 7.5 5 8 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 10820001 6 Ammonia 36 / 3 0.02 0.65 0.06 NA 0 / 0 7 NO Monitored Full 99990006 17 Ammonia 40 / 3 0.004 0.004 0 NA 0 / 0 7 NO Monitored Full 10820001 6 Chloride 36 / 3 8.9 25 17.6 NA 0 / 0 7 NO Monitored Full 10820001 6 Dissolved Oxygen 36 / 3 6.1 13.2 10 0 NA / NA 7 NO Monitored Full 99990006 17 Dissolved Oxygen 40 / 3 5.7 13.8 9.5 0 NA / NA 7 NO Monitored Full 10820001 6 pH 36 / 3 6.8 8.6 8 0 NA / NA 7 NO Monitored Full 99990006 17 pH 41 / 3 3.4 8.5 7.5 5 NA / NA 8 NO Monitored Full 10820001 6 Sulfate 36 / 3 8.8 28 17.3 0 NA / NA 7 NO Monitored Full 10820001 6 Temperature 36 / 3 0 27.6 12 0 NA / NA 7 NO Monitored Full 99990006 17 Temperature 40 / 3 0.1 28.1 15 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 10820001 6 Aluminum 14 / 3 6.5 1.3 0.5 0 / 0 NO Monitored Full 10820001 6 Arsenic 13 / 3 1.2 0.7 0.7 0 / 0 NO Monitored Full 10820001 6 Cadmium 13 / 3 0.1 0.0327 0.025 0 / 0 NO Monitored Full 10820001 6 Chromium 13 / 3 1.1 0.8 0.8 0 / 0 NO Monitored Full 10820001 6 Lead 13 / 3 1.1 0.2 0.1 0 / 0 NO Monitored Full 10820001 6 Nickel 13 / 3 3.3 2.4 2.3 0 / 0 NO Monitored Full 10820001 6 Silver 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10820001 6 Zinc 13 / 3 4.8 2 1.7 0 / 0 NO Monitored Full Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47f BMIBI BIT BMIBI Pass/Fail 844 8/6/18 2334 47f MS Floating Art Sub 71 Good 51 Pass 844 10/2/14 2334 47f MS Floating Art Sub 56 Good 51 Pass Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrate Evaluated Pass (2/2) Full Assessment was evaluated
because the drainage area of the sample site was Overall Evaluated Pass Full 1 greater than the calibrated
range.
Class BWW1 - Biological Sampling:
Class
HH - No Data
Assessment Key Dates
1/9/2018 | Fixed Monitoring Start Date |
12/1/2020 | Fixed Monitoring End Date |
8/6/2018 | Biological Monitoring |
10/2/2014 | Biological Monitoring |
Methods
150 | Monitoring data more than 5 years old |
230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |