Winnebago River IA 02-WIN-826
mouth (Floyd Co.) to confluence with Calmus Cr. at Mason City in S34 T97N R20W Cerro Gordo Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:36 AM
- Updated
- 1/12/2024 12:47:42 PM
The Class A1 use was assessed as "not supported" due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW1 use was assessed as "fully supported” based on biological sampling data and water quality monitoring data. The Class HH use was assessed as "fully supported" based on fish tissue sampling data.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 BIO See Below 1035 Winnebago River Winnebago near
Fossil Rock Park Iowa DNR 6 WQ CY 2012-2014 10170003 Winnebago River Downstream of Mason
City (DS1) Iowa DNR 6 FT See Below 1134 Winnebago River E of Mason City Site ID Data Source ID # Samples / # Years 2012 Geometric Mean 2013 Geometric Mean 2014 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10170003 6 22 / 3 387 222 371 Yes 13 59% Yes Evaluated Not Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10170003 6 33 / 3 8.5 8.1 8.2 0 0% No Evaluated Full Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations % Acute/ Chronic Violations Significantly >10% Violations Assessment Type Support Level 10170003 6 Ammonia 33 / 3 0.49 0.11 0.05 0 / 0 0% / 0% No Evaluated Full 10170003 6 Chloride 33 / 3 150 50 41 0 / 0 0% / 0% No Evaluated Full 10170003 6 Dissolved oxygen 33 / 3 15.4 10.8 11.1 NA / 0 NA / 0% No Evaluated Full 10170003 6 pH 33 / 3 8.5 8.1 8.2 0 / NA 0% / NA No Evaluated Full 10170003 6 Sulfate 33 / 3 110 70 74 0 / NA 0% / NA No Evaluated Full 10170003 6 Temperature 33 / 3 26.8 11.5 14.7 0 / 0 0% / 0% No Evaluated Full Fish: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47c FIBI BIT FIBI Pass/Fail 1035 8/1/19 695 47c MS Undetermined 59 Good 44 Pass 1035 8/13/18 695 47c MS Undetermined 54 Good 44 Pass 1035 7/12/17 695 47c MS Undetermined 44 Fair 44 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Fish Evaluated Pass (3/3) Full Assessment was evaluated because the
drainage area of the site Overall Evaluated Pass Full 1 used for the assessment was greater than the
calibrated range. Site ID Biopart Year Species # in sample / # of samples Avg Length (cm) (Avg) Hg (ppm) Chlordane (ppm) Sum PCBs (ppm) 1134 tissue plug 2015 walleye 5 41.9 0.092 Support Level Full
Presumptive Class A1 - Indicator Bacteria: 2012-2014
Presumptive Class A1 - pH: 2012-2014
Class BWW1 - Binomial Parameters: 2012-2014
Class BWW1 - Biological Sampling:
Overall:
Class HH - Fish Tissue Sampling: