Unnamed Tributary to Little Sioux River IA 06-LSR-6342
from mouth in S34 T94N R38W Clay Co. to headwaters in S14 T94N R38W Clay 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 8:13:33 AM
- Updated
- 1/4/2024 10:55:48 AM
The presumptive Class BWW1 use was assessed as “not supported” due to a fish kill investigation and "WINOFI" 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 BIO See Below 735 Unnamed Tributary to Little Sioux River Bertram Reservation – Peterson – HW86 BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47a BMIBI BIT BMIBI Pass/Fail 735 9/15/14 7.3 47a MO Surber 69 Good 54 Pass 735 9/15/14 7.3 47a MO Art Sub 33 Fair 54 Fail 735 8/4/14 7.3 47a MO Art Sub 26 Poor 54 Fail 735 8/4/14 7.3 47a MO Surber 50 Fair 54 Fail BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47a FIBI BIT FIBI Pass/Fail 735 9/15/14 7.3 47a MO NA 26 Fair 43 Fail 735 8/4/14 7.3 47a MO NA 13 Poor 43 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Fail (1/4) WINOFI Fish Evaluated Fail (0/2) WINOFI Assessment
was evaluated because the drainage area Overall Evaluated Fail WINOFI 3bu of
the sample site was smaller than the calibrated range. The
presumptive Class BWW1 aquatic life use assessment based on the 2011 fish kill
placed this segment in Category 5b. The fish kill was caused by a “pollutant”
or was suspected to be caused by a “pollutant”; therefore, the presumptive
Class BWW1 use was considered impaired. Because the source of the pollutant was
not identified and/or the enforcement actions taken against the responsible
party have not been resolved, the presumptive Class BWW1 use was placed in
Category 5b. Due to uncertainty regarding the recovery of the aquatic life
following the fish kill, any existing fish kill 5b impairment will remain in
Category 5b until more recent sampling has shown recovery of the aquatic
community or the responsible party has paid restitution.
Presumptive Class A1 - No Data
Presumptive Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Fish:
Overall:
Presumptive Class BWW1 – Fish kill Assessment:
Details about the 2011 fish kill can be found here: https://programs.iowadnr.gov/fishkill/Events/831