French Creek IA 01-UIA-248
from mouth (T99N R5W S1 Allamakee County) to confluence with French Creek - West Branch (T99N R23W S23 Allamakee County)
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:45 AM
- Updated
- 1/9/2024 11:38:29 AM
The presumptive Class A1 use and the Class A2 use both remain assessed as "not supported" based on levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The Class BCW1 use was assessed as "fully supported" based on biological sampling data and on the trout reproduction in Iowa streams summary prepared by the DNR Fisheries Bureau. The Class HH (fish consumption) use remains 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 BIO See Below 48 French Creek French Creek SWMA -
Waukon Iowa DNR 6 BIO See Below 539 French Creek (Main
Branch) Waukon NEIARCD 19 WQ CY 2012-2014 190050007 French Creek N of Churchtown Iowa DNR 6 BIO See Below 1152 French Creek N of Churchtown 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 190050007 6 21 / 3 903 2442 622 Yes 18 86% Yes Evaluated Not 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 190050007 6 21 / 3 903 2442 622 Yes 4 19% No Evaluated Not Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear CBI score CBI Class CBI BIT CBI Pass/Fail 48 8/3/22 10 52b MS Hess 75 NA 60 Pass 48 8/18/21 10 52b MS Hess 88 NA 60 Pass 539 8/17/21 6.1 52b MS Hess 76 NA 60 Pass 48 7/16/20 10 52b MS Hess 67 NA 60 Pass 48 8/5/19 10 52b MS Hess 77 NA 60 Pass 48 7/24/18 10 52b MS Hess 70 NA 60 Pass Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Monitored Pass (6/6) Full 1 Assessment was
monitored because it included multiple samples collected in the previous five
years. Based on the January 2024
trout reproduction in Iowa streams summary prepared by the DNR Fisheries
Bureau, the Class BCW1 use of French Creek was assessed as "fully
supported". According to the updated summary, this stream was placed in Category I: streams that exhibit consistent natural reproduction and
maintain a wild population of one or more trout species without any stocking. Site ID Biopart Year Species # of samples Avg Length (cm) (Avg) Hg (ppm) 1152 tissue plug 2015 brown trout 5 36.0 0.05 Support Level Full
Presumptive Class A1 - Indicator Bacteria: 2012-2014:
Class A2 - Indicator Bacteria: 2012-2014:
Class BCW1 - Biological Sampling:
Benthic Macroinvertebrates:
Class BCW1 – Trout Natural Reproduction:
Class HH - Fish Tissue Sampling: