Little Turkey River IA 01-TRK-162
from the Clayton/Delaware county line to south line of S11 T90N R3W in Delaware 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 8:12:31 AM
- Updated
- 12/14/2023 9:16:04 AM
The presumptive Class A1 use and Class A2 use was assessed as "not supported” due to high levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The Class BCW1 use was assessed as "not supported" based on biological sampling data. All other designated uses were "not assessed."
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2010 11280002 Little Turkey River Near Colesburg (Site LTR1) Iowa DNR 6 BIO See Below 631 Little Turkey River Colesburg (DS) Site ID Data Source ID # Samples / # Years 2010 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 11280002 6 16 / 1 2523 Yes 14 88% Yes Evaluated Not Site ID Data Source ID # Samples / # Years 2010 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 11280002 6 16 / 1 2523 Yes 9 56% Yes Evaluated Not Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear CBI score CBI Class CBI BIT CBI Pass/ Fail 631 7/18/12 7 52b MS/CW Hess 34 NA 60 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Fail (0/1) Not 5bv Assessment was evaluated because it was
based on a single sample. In contrast to the benthic macroinvertebrate
data, based on the January 2024 trout reproduction in Iowa streams summary
prepared by the DNR Fisheries Bureau, the Class BCW1 coldwater aquatic life use
of the Little Turkey River was assessed as "fully supported."
According to the updated summary, this stream was placed in Category II:
streams that exhibit recent but inconsistent reproductive success and
occasional stocking may be needed to maintain the trout population(s).
Presumptive Class A1 - Indicator Bacteria:
Presumptive Class A2 - Indicator Bacteria:
Class BCW1 - Biological Sampling:
Overall Assessment:
Class BCW1 - Trout Natural Reproduction:
Class HH - No Data