Cedar River IA 02-CED-457
from confluence with Bear Cr. (NE 1/4 S21 T84N R8W Linn Co.) to confluence with Hinkle Cr. in SW 1/4 S16 T85N R10W Benton Co.
- Cycle
- 2026
- Current Phase
- Public Comment
- Overall IR
- 3 - Insufficient data exist to determine whether any designated uses are met.
- Trend
- Stable
- Created
- 10/27/2025 3:09:32 PM
- Updated
- 2/11/2026 9:32:06 AM
The Class BWW1 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 WQ CY 2022 14000349 Cedar
River
Class A1 – 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 14000349 6 7 / 1 8.08 8.77 8.53 0 3 NO EVALUATED FULL Class BWW1 - Binomial 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 14000349 6 Dissolved Oxygen 7 / 1 8 15.5 12.4 0 NA / NA 3 NO EVALUATED FULL 14000349 6 pH 7 / 1 8.08 8.77 8.53 0 NA / NA 3 NO EVALUATED FULL 14000349 6 Temperature 7 / 1 7.24 25.93 18.95 0 NA / NA 3 NO EVALUATED FULL
Benthic Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47c BMIBI BIT BMIBI Pass/Fail 869 10/7/11 6238 47c MS Hess 45 Fair 70 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Fail (0/1) WINOFI 3bu Assessment was
evaluated because the drainage area of the site was larger than the calibrated
range.
Iowa DNR 6 BIO See Below 869 Cedar River Palo (dstr of DAEC)
Class A1 - Indicator Bacteria: No Data
Class HH: No Data
Class BWW1 - Biological Sampling:
Overall Assessment: