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
- 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 2:40:01 PM
- Updated
- 10/12/2020 1:32:52 PM
Assessment Summary
The Class A1 primary contact recreation use remains assessed as "partially supported" due to 2014-2016 levels of indicator bacteria that violate state water quality criteria. The Class HH (fish consumption) use was assessed as “fully supporting” based on 2014 fish tissue sampling. 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
Sources of Data: 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 Class A1 - Indicator Bacteria: 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 Partial Class
HH – Fish Tissue Sampling: Site ID Date Species Name Biopart # in sample chlordane result chlordane violation (>0.6)? PCBs result PCBs violation (>0.2)? Hg result Hg violation (>0.3)? Assessment Type Support Level 176 9/25/2014 Common Carp whole 3 0.11 No <0.24 No 0.1 No Monitored 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.
Assessment Key Dates
| 1/7/2014 | Fixed Monitoring Start Date |
| 12/8/2016 | Fixed Monitoring End Date |
| 9/25/2014 | Fish Tissue Monitoring |
Methods
| 260 | Fish tissue analysis |
| 420 | Indicator bacteria monitoring |