Cedar River IA 02-CED-462
from bridge crossing in LaPorte City in S19 T87N R11W Black Hawk Co.) to dam of Cedar Falls Impoundment in NW 1/4 S12 T89N R14W Black Hawk Co.
- Cycle
- 2022
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/16/2021 8:51:37 AM
- Updated
- 1/13/2022 7:33:53 AM
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 "WINOFI" based on biological sampling data. The Class HH (fish consumption) 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 WQ CY 2012-2014 10070006 Cedar
River downstream of Waterloo Iowa DNR 6 BIO See Below 848 Cedar
River Downstream
of Waterloo Iowa DNR 6 BIO See Below 1100 Cedar
River Above
LaPorte City Iowa DNR 6 BIO See Below 1102 Cedar
River George
Wyth State Park Iowa DNR 6 FT See Below 372 Cedar
River Waterloo 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 10070006 6 22 / 3 97 165 172 Yes 6 27% 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 10070006 6 33 / 3 9 8.24 8.3 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 10070006 6 Ammonia 33 / 3 1.7 0.19 0.05 0 / 0 0% / 0% No Evaluated Full 10070006 6 Chloride 33 / 3 72 30.4 28 0 / 0 0% / 0% No Evaluated Full 10070006 6 Dissolved oxygen 33 / 3 17.3 11.5 11.7 NA / 0 NA / 0% No Evaluated Full 10070006 6 pH 33 / 3 9 8.24 8.3 0 / NA 0% / NA No Evaluated Full 10070006 6 Sulfate 33 / 3 47 33.4 34 0 / NA 0% / NA No Evaluated Full 10070006 6 Temperature 33 / 3 27 11.7 12.4 0 / 0 0% / 0% No Evaluated Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47c BMIBI BIT BMIBI Pass/Fail 848 9/9/14 5234 47c MS Hess 56 Good 70 Fail 848 9/9/14 5234 47c MS Floating Art Sub 51 Fair 52 Fail Fish: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47c FIBI BIT FIBI Pass/Fail 1100 9/22/20 5505 47c MS Undetermined 4 Poor 44 Fail 1102 9/7/17 5790 47c MS Undetermined 4 Poor 44 Fail Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/2) Not Fish Evaluated Fail (0/2) Not 3bu Assessment was evaluated
because the drainage areas of the sample sites Overall Evaluated Fail WINOFI were 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) 372 tissue plug 2020 channel catfish 10 53.8 0.192
372 tissue plug 2019 walleye 7 46.1 0.261
Support Level Full
Class A1 – Indicator Bacteria: 2012-2014
Class A1 - pH: 2012-2014
Class BWW1 - Conventional Parameters: 2012-2014
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Class HH - Fish Tissue Sampling: