Yellow River IA 01-YEL-437
from N. Fk. Yellow R. (S13 T96N R7W Allamakee Co.) to confluence with unnamed tributary in SE 1/4 S8 T96N R7W Winneshiek Co.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 8/27/2020 2:10:28 PM
- Updated
- 10/16/2020 7:04:45 AM
The presumptive Class A1 use remains assessed as “not supported” due to levels of indicator bacteria (E. coli) that exceeded state water quality criteria and "partially supported" due to pH levels that exceeded the upper pH water quality criterion. The Class BWW2 use remains assessed as “partially supported” based on biological sampling data and also based on violations of the Class BWW2 criterion for pH. Note: A TMDL for the bacterial impairment for Yellow River basin streams was prepared by Iowa DNR in 2012 and was approved by U.S. EPA in February 2013. Due to TMDL completion, the Integrated Report category for the Class A1 recreational use was changed from 5p to 4a.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY2011 & CY2014 11960006 Yellow River near Castalia Site YeRi3 Iowa DNR 6 WQ CY2011 & CY2014 15960002 Yellow River at 107 Ave Iowa DNR 6 BIO See Below 568 Yellow River Postville – Site YeRi1 Iowa DNR 6 BIO See Below 579 Yellow River Castalia – Site YeRi3 Iowa DNR 6 BIO See Below 580 Yellow River Castalia – Site YeRi4 Presumptive Class A1 - Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2014 Geometric Mean Annual Geometric Mean
Violation # Violations % Violations Significantly >10%
Violations Assessment Type Support Level 11960006 6 20 / 1 601 Yes 15 75% Yes Evaluated Partial 15960002 6 20 / 1 1661 Yes 17 85% Yes Evaluated Not Class A - pH: Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10%
Violations Assessment Type Support Level 11960006 6 14 / 1 9.6 8.6 8.6 4 29% Yes Evaluated Partial 15960002 6 14 / 1 9.2 8.43 8.45 1 7% No Evaluated Full Class BWW2 - Conventional Parameters: 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 11960006 6 Ammonia 8 / 1 0.09 0.06 0.05 0 / 0 0% / 0% No Evaluated Full 11960006 6 Dissolved Oxygen 14 / 1 16 9 8.3 0 / 0 0% / 0% No Evaluated Full 11960006 6 pH 14 / 1 9.6 8.6 8.6 4 / 0 29% / 0% Yes Evaluated Partial 11960006 6 Temperature 14 / 1 21.7 14.3 14.7 NA / 0 NA / 0% No Evaluated Full 15960002 6 Ammonia 8 / 1 016 0.08 0.05 0 / 0 0% / 0% No Evaluated Full 15960002 6 Dissolved Oxygen 14 / 1 15 8.4 7.5 0 / 0 0% / 0% No Evaluated Full 15960002 6 pH 14 / 1 9.2 8.43 8.45 1 / 0 7% / 0% No Evaluated Full 15960002 6 Temperature 14 / 1 23.6 14.7 15.4 NA / 0 NA / 0% No Evaluated Full Class BWW2 - Biological Sampling: Benthic Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 52b BMIBI BIT BMIBI Pass/ Fail 568 7/25/07 20 52b MS/WW Hess 70 Good 61 Pass 568 8/1/06 20 52b MS/WW Hess 74 Good 61 Pass Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 52b FIBI BIT FIBI Pass/ Fail 580 7/26/07 10 52b MS/WW NA 58 Good 52 Pass 568 7/25/07 20 52b MS/WW NA 48 Fair 52 Fail 579 7/25/07 13 52b MS/WW NA 49 Fair 52 Fail 568 8/1/06 20 52b MS/WW NA 46 Fair 52 Fail Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic Macroinvertebrates Evaluated Pass (2/2) Full Fish Evaluated Fail (1/4) Partial Overall Evaluated Fail Partial 3bc 5bt Assessment is evaluated because the samples
included in the assessment weren’t collected in the last five years.