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
- 2020
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 8/12/2020 2:17:36 PM
- Updated
- 10/15/2020 1:29:50 PM
Assessment Summary
The Class A1 use was assessed as "partially 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. The Class HH use was assessed as "fully supported" based on water quality monitoring data.
Assessment Explanation
Sources of
Data: Data Source Data Source ID Data Type Data Age Site ID BioNet Site ID Site Name Site Description Iowa DNR 6 WQ CY 2016-2018 10820001
Wapsipinicon River at De Witt LTRMP 17 WQ CY 2016-2018 99990006
Wapsipinicon River Iowa DNR 6 BIO See Below
844 Wapsipinicon River at De Witt Ambient Monthly WQ Class A1 -
Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2016 Geometric Mean 2017 Geometric Mean 2018 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10820001 6 22 / 3 268.25 185.59 241.04 Yes 11 50% Yes Monitored Partial Class A - pH: Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10820001 6 36 / 3 8.6 8 8.1 0 0% No Monitored Full 99990006 17 41 / 3 8.8 7.9 7.9 1 2% No Monitored Full Class BWW1 -
Conventional Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations % Acute/ Chronic Violations Significantly >10% Violations Assessment Type Support Level 10820001 6 Ammonia 36 / 3 0.65 0.06 0.02 0 / 0 0% / 0% No Monitored Full 99990006 17 Ammonia 41 / 3 0.331 0.03 0.02 0 / 0 0% / 0% No Monitored Full 10820001 6 Chloride 36 / 3 25 18.6 19 0 / 0 0% / 0% No Monitored Full 10820001 6 Dissolved oxygen 36 / 3 14.1 10 10 NA / 0 NA / 0% No Monitored Full 99990006 17 Dissolved oxygen 42 / 3 15.2 9.9 9.9 NA / 0 NA / 0% No Monitored Full 10820001 6 pH 36 / 3 8.6 8 8.1 0 / NA 0% / NA No Monitored Full 99990006 17 pH 41 / 3 8.8 7.9 7.9 1 / NA 2% / NA No Monitored Full 10820001 6 Sulfate 36 / 3 28 17.8 18 0 / NA 0% / NA No Monitored Full 10820001 6 Temperature 36 / 3 27.3 12.2 12 0 / 0 0% / 0% No Monitored Full 99990006 17 Temperature 42 / 3 28.1 16.2 17.4 0 / 0 0% / 0% 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 % Acute/ Chronic Violations >1 Acute / Chronic Violation Assessment Type Support Level 10820001 6 Aluminum 9 / 2 6.5 1.852 1.6 0 / 0 0% / 0% No Evaluated Full 10820001 6 Arsenic 9 / 2 1.2 0.82 0.93 0 / 0 0% / 0% No Evaluated Full 10820001 6 Cadmium 9 / 2 0.1 0.033 0.025 0 / 0 0% / 0% No Evaluated Full 10820001 6 Chromium 9 / 2 1.1 0.64 0.67 0 / 0 0% / 0% No Evaluated Full 10820001 6 Copper 9 / 2 4 1.37 0.81 0 / 0 0% / 0% No Evaluated Full 10820001 6 Lead 9 / 2 1.1 0.19 0.07 0 / 0 0% / 0% No Evaluated Full 10820001 6 Nickel 9 / 2 2.4 1.9 2.1 0 / 0 0% / 0% No Evaluated Full 10820001 6 Selenium 9 / 2 1.2 0.63 0.63 0 / 0 0% / 0% No Evaluated Full 10820001 6 Zinc 9 / 2 3.9 1.28 0.8 0 / 0 0% / 0% No Evaluated Full Class
BWW1 - Biological Sampling: Benthic
Macroinvertebrates: 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 Earned IR Category Actual IR Category Reason Benthic Macroinvertebrate Evaluated Pass (2/2) Full Overall Evaluated Pass Full 1 1 Assessment is evaluated because
segment did not have two BM and/or fish samples collected in last five years
and watershed size was larger than calibrated range. Class HH-F -
Toxic Parameters: 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 Cadmium 9 / 2 0.1 0.033 0.025 8 No Evaluated Full 10820001 6 Chromium 9 / 2 1.1 0.64 0.67 0 No Evaluated Full 10820001 6 Copper 9 / 2 4 1.37 0.81 0 No Evaluated Full 10820001 6 Nickel 9 / 2 2.4 1.9 2.1 0 No Evaluated Full 10820001 6 Selenium 9 / 2 1.2 0.63 0.63 2 No Evaluated Full 10820001 6 Zinc 9 / 2 3.9 1.28 0.8 0 No Evaluated Full
Assessment Key Dates
1/5/2016 | Fixed Monitoring Start Date |
12/6/2018 | Fixed Monitoring End Date |
8/6/2018 | Biological Monitoring |
10/2/2014 | Biological Monitoring |
Methods
230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |