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
- 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 8:12:42 AM
- Updated
- 1/17/2024 7:55:02 AM
Assessment Summary
The 2020-2022 E. coli data suggest full support of the Class A1 use; however, delisting an impairment requires a monitored assessment. Therefore, the Category 5a Class A1 impairment will remain. 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 BIO See Below 844 Wapsipinicon River
at De Witt Iowa DNR 6 WQ CY 2020-2022 10820001 Wapsipinicon River
at De Witt LTRMP 17 WQ CY 2020-2022 99990006 Wapsipinicon River 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 10820001 6 8/8/8 104 95 97 NO 2 / 3 2 / 3 1 / 3 NA Eval Full The 2020-2022 E. coli data suggest full support of the Class A1 use; however, delisting an impairment requires a monitored assessment. Therefore, the Category 5a Class A1 impairment will remain. Class A1 – 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 7.7 8.5 8.2 0 7 NO Mon Full 99990006 17 40 / 3 5.8 8.9 7.8 4 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 10820001 6 Chloride 36 / 3 13 25 20 NA 0 / 0 7 NO Mon Full 10820001 6 Dissolved Oxygen 35 / 3 6.9 14.6 10.6 0 NA / NA 7 NO Mon Full 99990006 17 Dissolved Oxygen 40 / 3 6.1 14.7 10.3 0 NA / NA 7 NO Mon Full 10820001 6 pH 36 / 3 7.7 8.5 8.2 0 NA / NA 7 NO Mon Full 99990006 17 pH 40 / 3 5.8 8.9 7.8 4 NA / NA 7 NO Mon Full 10820001 6 Sulfate 36 / 3 10 30 20 0 NA / NA 7 NO Mon Full 10820001 6 Temperature 36 / 3 0 27.8 12.1 0 NA / NA 7 NO Mon Full 99990006 17 Temperature 40 / 3 0.1 26.2 16.3 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 10820001 6 Ammonia 36 / 3 0.16 0.03 0.02 0 / 0 NO Mon Full 99990006 17 Ammonia 40 / 3 0.004 0 0 0 / 0 NO Mon Full 10820001 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10820001 6 Chromium 20 / 3 2 0.68 0.5 0 / 0 NO Mon Full 10820001 6 Lead 20 / 3 1 0.93 1 0 / 0 NO Mon Full 10820001 6 Nickel 20 / 3 3.3 1.1 0.9 0 / 0 NO Mon Full 10820001 6 Selenium 18 / 2 2 0.6 0.5 0 / 0 NO Mon Full 10820001 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10820001 6 Zinc 20 / 3 4.8 1 0.5 0 / 0 NO Mon 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 8/24/22 2334 47f MS Floating Art Sub 39 Good 51 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 (2/3) Full Assessment was evaluated because the
drainage area of the sample site was Overall Evaluated Pass Full 1 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 10820001 6 Selenium 18 / 2 2 0.6 0.5 15 NO Mon Full
Class A1 - Indicator Bacteria:
Class BWW1 - Binomial Parameters:
Class BWW1 - Toxic Parameters:
Class BWW1 - Biological Sampling:
Class HH-F - Toxic Parameters:
Assessment Key Dates
1/6/2020 | Monitoring Start |
12/5/2022 | Monitoring End |
8/6/2018 | Biological Monitoring |
10/2/2014 | Biological Monitoring |
8/24/2022 | Biological Monitoring |
Methods
150 | Monitoring data more than 5 years old |
200 | Physical/Chemical Monitoring |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |