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
- 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 2:12:05 PM
- Updated
- 1/4/2022 8:50:27 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 176 Wapsipinicon River N of McCausland @ McCausland Access 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) 176 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:
Class BWW1 – No Data
Class HH - Fish Tissue Sampling:
Assessment Key Dates
1/7/2014 | Non-fixed Monitoring Start Date |
12/8/2016 | Non-fixed Monitoring End Date |
9/25/2014 | Fish Tissue Monitoring |
Methods
220 | Non-fixed station physical/chemical monitoring (conventional pollutant only) |
260 | Fish tissue analysis |
420 | Indicator bacteria monitoring |