South Raccoon River IA 04-RAC-1183
from confluence with Middle Raccoon R. (S9 T78N R29W Dallas Co.) to confluence with Brushy Cr. in S22 T79N R31W Guthrie Co.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 6/10/2020 9:38:10 AM
- Updated
- 10/15/2020 11:40:37 AM
The Class A1 use remains assessed as "not supported" due to levels of indicator bacteria that violated state water quality criteria. The Class BWW1 use remains assessed as "partially supported" due to a fish kill investigation. All other designated uses were "not assessed".
Sources of Data: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 BIO See Below 860 South Raccoon River Nations Bridge County Park - Stuart Iowa DNR 6 WQ CY 2005 11250001 South Raccoon River Site 32 at Redfield Class
A1 - Indicator Bacteria: Site
ID Data
Source ID #
Samples / # Years 2005
Geometric Mean (4 samples) Annual
Geometric Mean Violation #
Violations %
Violations Significantly
>10% Violations Assessment
Type Support
Level 11250001 6 4
/ 1 6734 Yes 4 100% NA Evaluated Not Class
BWW1 - Biological Sampling: Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear BMIBI score BMIBI Class 47f BMIBI BIT BMIBI Pass/ Fail 181 7/25/12 330 47f MS/WW Hess 65 Good 51 Pass Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal Riffle Stream? FIBI score FIBI Class 47f FIBI BIT FIBI Pass/ Fail 181 7/25/12 330 47f MS/WW NA 53 Good 36 Pass Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (1/1) Full Fish Evaluated Pass (1/1) Full Overall Evaluated Pass Full 1 1 Assessment
is evaluated because it was based on an old single sample. Class
BWW1 – Fishkill Assessment: The Class
BWW1 aquatic life use assessment based on the 2014 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 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 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.
Details
about the 2014 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/874