Cedar River IA 02-CED-452
from Hwy 30 bridge at Cedar Rapids (S9 T82N R6W Linn Co) to confluence with Prairie Cr. in the SE 1/4 S34 T83N R7W Linn Co.
The Class A1 use remains assessed as "partially supported" due to levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The Class BWW1 use remains assessed as “partially supported” based on the biological sampling data. The Class HH use remains assessed as “fully supported” based on fish tissue sampling data. Note: A TMDL for indicator bacteria in this segment of Cedar River was prepared and approved by EPA in February 2010. The approval of this TMDL moved the bacterial impairment for this segment from Iowa's list of Section 303(d) waters (Category 5a of the IR) to IR Category 4a.
Sources of
Data: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2014-16 10570001 Cedar River DS of Cedar Rapids (DS1) Site located in Seg. 451 and no longer
used for this segment. Iowa DNR 6 BIO See Below 503 Cedar River Bertram – REMAP #185 Iowa DNR 6 FT See Below 16 Cedar River At Cedar Rapids Class A1 -
Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2014 Geometric Mean 2015 Geometric Mean 2016 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10570001 6 23 / 3 131 277 233 Yes 10 43% Yes Monitored Partial Class BWW1 - Biological Sampling: Benthic Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear BMIBI score BMIBI Class 47f BMIBI BIT BMIBI Pass/ Fail 503 10/10/05 6829 47f MS/WW ArtSub 47 Fair 51 Fail 503 9/1/05 6829 47f MS/WW ArtSub 19 Poor 51 Fail Overall Assessment: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/2) Partial 3bu 3bu Assessment is evaluated because the
drainage area of the sample site is larger than calibrated range. Class HH – Fish Tissue Sampling: Site ID Date Species Name Biopart # in sample chlordane result chlordane violation (>0.6)? PCBs result PCBs violation (>0.2)? Hg result Hg violation (>0.3)? Assessment Type Support Level 16 8/16/2016 channel catfish fillet 3 <0.02 No <0.06 No 0.12 No Monitored Full 16 8/3/2015 largemouth bass plug 5 0.050 No Monitored Full 16 8/3/2015 channel catfish fillet 5 <0.02 No 0.26 Yes 0.09 No Monitored Partial