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
- 2024
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:40 AM
- Updated
- 1/12/2024 2:18:28 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 "WINOFI" based on biological sampling data. The Class HH (fish consumption) use was assessed as "WINOFI" based on an average walleye sample above the mercury consumption advisory threshold.
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 1218 Cedar River Waterloo Iowa DNR 6 FT See Below 1369 Cedar River (U) 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 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 Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/2) WINOFI Fish Evaluated Fail (0/2) WINOFI 3bu Assessment was evaluated because the
drainage area of Overall Evaluated Fail WINOFI the sample site 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) 1218 tissue plug 2021 channel catfish 5 54.0 0.165 1218 tissue plug 2021 common carp 10 53.8 0.109 1218 tissue plug 2021 walleye 6 45.5 0.366 1369 tissue plug 2019 walleye 7 46.1 0.261 1369 tissue plug 2020 channel catfish 10 53.8 0.192 1369 tissue plug 2021 walleye 2 44.8 0.194 1369 tissue plug 2021 smallmouth bass 20 31.5 0.218 1369 tissue plug
Support Level WINOFI
Class A1 – Indicator Bacteria: 2012-2014
Class A1 - pH: 2012-2014
Class BWW1 - Binomial Parameters: 2012-2014
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Fish:
Overall:
Class HH - Fish Tissue Sampling: