Wapsipinicon River IA 01-WPS-333
from Silver Cr. (NW 14 S6 T80N R4E Clinton Co.) to confluence Rock Cr. in S35 T81N R1E 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 8:12:24 AM
- Updated
- 2/1/2024 10:24:45 AM
Assessment Summary
The Class A1 use was assessed as "not supported" due to levels of indicator bacteria that violated state water quality criteria. The Class HH (fish consumption) use was assessed as “fully supported” based on fish tissue sampling data. All other designated uses were "not assessed." Note: The historical assessments for this segment used data collected in Segment 332. While the primary contact recreation impairment of this segment will continue, beginning with the 2020 IR, segments will only be assessed using data collected within that 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 2014-2016 10820001 Wapsipinicon River at De Witt Site located in Segment 332; no longer used for this segment. Iowa DNR 6 FT See Below 1174 Wapsipinicon River SSE of Grand Mound Iowa DNR 6 FT See Below 1380 Wapsipinicon (D) River Allen’s Grove Park Boat Ramp Site ID Data Source ID # Samples / # Years 2014 Geometric Mean 2015 Geometric Mean 2016 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10820001 6 24 / 3 106 179 295 Yes 10 42% Yes Evaluated Not Site ID Biopart Year Species # in sample / # of samples Avg Length (cm) (Avg) Hg (ppm) Chlordane (ppm) Sum PCBs (ppm) 1380 tissue plug 2021 smallmouth bass 14 26.3 0.116
1380 tissue plug 2021 walleye 2 46.8 0.228
1174 whole 2014 common carp 3 55.4 0.1 0.11 <0.24* Support Level Full *In 2014, the lab
reported non-detected Total PCB results as <0.24 ppm which higher than
Iowa’s one meal/week advisory level.
Class A1 - Indicator Bacteria: 2014-2016
Class BWW1 – No Data
Class HH - Fish Tissue Sampling:
Assessment Key Dates
1/7/2014 | Monitoring Start |
12/8/2016 | Monitoring End |
9/25/2014 | Fish Tissue Monitoring |
8/25/2021 | Fish Tissue Monitoring |
Methods
150 | Monitoring data more than 5 years old |
260 | Fish tissue analysis |
420 | Indicator bacteria monitoring |