Volga River IA 01-VOL-290
from confluence with Cox Cr. (S21 T92N R5W Clayton Co.) to bridge crossing in Volga (north line S10 T92N R6W Clayton Co.).
The Class A1 use remains assessed as "not supported" based on levels of indicator bacteria (E. coli) that violated state water quality standards. The Class BWW1 use was assessed as "fully supported" based on biological sampling data. All other designated uses were “not assessed." Note: A TMDL for pathogen indicators in this segment of the Volga River was prepared by DNR and approved by EPA in 2006. This waterbody remains in IR Category 4a.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2001 11220004 Volga River E of
Volga, Osborne Park (34) Iowa DNR 6 WQ CY 2001 11220007 Volga River at Volga
(35) Iowa DNR 6 BIO See Below 1309 Volga River Volga (REMAP #269) Site ID Data Source ID # Samples / # Years 2001 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 11220004 6 9 / 1 245 Yes 4 44% NA Evaluated Not 11220007 6 9 / 1 276 Yes 4 44% NA Evaluated Not Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 52b BMIBI BIT BMIBI Pass/Fail 1309 7/28/21 262.0 52b MS Hess 86 Excellent 61 Pass Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 52b FIBI BIT FIBI Pass/Fail 1309 7/28/21 262.0 52b MS NA 84 Excellent 52 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (1/1) Full Fish Evaluated Pass (1/1) Full 1 Assessment was evaluated because it was based
on a single sample. Overall Evaluated Pass Full
Class A1 - Indicator Bacteria: Historical
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Fish:
Overall:
Class HH - No Data