Wapsipinicon River IA 01-WPS-343
from Harter Cr. at Independence (NW 1/4 S34 T89N R9W Buchanan Co.) to confluence with Little Wapsipinicon R. near Littleton in S9 T89N R10W Buchanan 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
- 12/7/2021 3:50:57 PM
- Updated
- 1/27/2022 10:53:25 AM
Assessment Summary
The Class A1 use was assessed as “not supported” based on 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 (fish consumption) use was assessed as “not supported” based on fish tissue monitoring data and on the existence of a one meal/week mercury consumption advisory for walleye on this segment.
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 10100001 Wapsipinicon River near Independence (US1)
Iowa DNR 6 BIO See Below 949 Wapsipinicon River Independence Iowa DNR 6 FT See Below 369 Wapsipinicon River Otterville Bridge 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 10100001 6 6/3/7 589 252 58 YES 5 / NA 1 / NA 1 / 3 NA 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 10100001 6 36 / 3 6.7 8.6 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 10100001 6 Ammonia 36 / 3 0.02 0.87 0.1 NA 0 / 0 7 NO Monitored Full 10100001 6 Chloride 36 / 3 6.7 25 16.1 NA 0 / 0 7 NO Monitored Full 10100001 6 Dissolved Oxygen 36 / 3 6.2 13.6 9.7 0 NA / NA 7 NO Monitored Full 10100001 6 pH 36 / 3 6.7 8.6 7.9 0 NA / NA 7 NO Monitored Full 10100001 6 Sulfate 36 / 3 5 33 16 0 NA / NA 7 NO Monitored Full 10100001 6 Temperature 36 / 3 0.1 28.1 11.2 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 10100001 6 Aluminum 14 / 3 1.8 0.4 0.3 0 / 0 NO Monitored Full 10100001 6 Arsenic 13 / 3 0.7 0.5 0.5 0 / 0 NO Monitored Full 10100001 6 Cadmium 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10100001 6 Chromium 13 / 3 1 0.66 0.66 0 / 0 NO Monitored Full 10100001 6 Lead 13 / 3 0.32 0.12 0.11 0 / 0 NO Monitored Full 10100001 6 Nickel 13 / 3 2.9 2.3 2.3 0 / 0 NO Monitored Full 10100001 6 Silver 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10100001 6 Zinc 13 / 3 3 1.81 1.6 0 / 0 NO Monitored Full Class
BWW1 - Biological Sampling: Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47cBMIBI BIT BMIBI Pass/Fail 949 10/3/17 909 47c MS Art Sub 63 Good 52 Pass Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrate Evaluated Pass (1/1) 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 Biopart Year Species # in sample / # of samples Avg Length (cm) (Avg) Hg (ppm) Chlordane (ppm) Sum PCBs (ppm) 369 tissue plug 2020 northern pike 10 69 0.294
369 tissue plug 2020 walleye 1 49.8 0.4
369 tissue plug 2019 walleye 9 48.5 0.384
Support Level Not A one meal/week mercury consumption advisory for
walleye exists on this segment. Based on IR Methodology, the Class HH (fish
consumption) use was assessed as “not supported.”
Class HH - Fish Tissue Sampling:
Assessment Key Dates
1/8/2018 | Fixed Monitoring Start Date |
12/7/2020 | Fixed Monitoring End Date |
10/3/2017 | Biological Monitoring |
7/1/2019 | Fish Tissue Monitoring |
7/1/2020 | Fish Tissue Monitoring |
Methods
230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
260 | Fish tissue analysis |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
420 | Indicator bacteria monitoring |