Clear Creek IA 01-UIA-235
mouth (Allamakee Co.) to west line of S25 T99N R4W Allamakee Co.
- Cycle
- 2022
- Release Status
- Final
- Overall IR
- 3 - Insufficient data exist to determine whether any designated uses are met.
- Trend
- Unknown
- Created
- 12/14/2021 9:59:02 AM
- Updated
- 1/28/2022 8:21:02 AM
The Class BCW1 use was assessed as "WINOFI" based on biological sampling data. All other designated uses were "not assessed."
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 BIO See Below 666 Clear Creek Lansing - CCr1 Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear CBI score CBI Class CBI BIT CBI Pass/ Fail 666 7/19/17 11 52b MS/CW Hess 54 NA 60 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Fail (0/1) WINOFI 3bc Assessment was evaluated because it was based
on a single sample. In contrast to the
benthic macroinvertebrate data, based on the January 2021 trout reproduction in
Iowa streams summary prepared by the DNR Fisheries Bureau, the Class BCW1
coldwater aquatic life use of Clear Creek was assessed as "fully
supported." According to the updated summary, this stream was placed in
Category I: streams that exhibit consistent natural reproduction and maintain a
wild population of one or more trout species without any stocking. The results of
continuous dissolved oxygen (DO) and temperature monitoring in 2013 for the
DNR/SHL coldwater stream sampling project also did not suggest impairment of
Class BCW1 uses. The lowest DO concentration recorded in 71 days of continuous
monitoring was 7.0 mg/L. The daily DO minimum concentration failed to meet the
24-hour DO criterion (5 mg/L) and the 16-hour DO criterion (7 mg/L) in 0 of 71
days each. The percentage exceeding (0%) was less than (passing) the 10%
impairment threshold used to assess conventional water quality parameters. The
associated statistical analysis confidence level was high (>90%). The
maximum stream temperature recorded during the sensor deployment period was
20.9 degrees (C). The BCW1 temperature criterion of 20 (C) was exceeded in 5 of
71 days. The percentage exceeding (7%) was less than (passing) the 10%
impairment threshold; however, the statistical analysis confidence level (<
90%) was not high. Based on these data, the BCW1 aquatic life use was assessed
as "fully supported" with respect to DO and temperature. The assessment type is
“evaluated” because it is based on data collected from a single year within the
current data assessment period.
Presumptive Class A1 - No Data
Class A2 - No Data
Class BCW1 - Biological Sampling:
Overall Assessment:
Class BCW1 – Trout Natural Reproduction:
Class BCW1 – Continuous Monitoring Data:
Class HH - No Data