Floyd River IA 06-FLO-1554
from city of Alton (north line S11 T94N R44W Sioux Co.) to confluence with North Fork Floyd R. in S9 T97N R41W O'Brien Co.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 6/19/2020 9:31:05 AM
- Updated
- 10/15/2020 11:35:55 AM
The Class BWW2 use remains assessed as “partially supported” based on reoccurring fish kills in this segment and on the results of biological sampling data. 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 355 Floyd River Sanborn – REMAP #67 Iowa DNR 6 BIO See Below 364 Floyd River Alton – REMAP #85 Iowa DNR 6 BIO See Below 617 Floyd River Hospers – REMAP #225 Class
BWW2 - Biological Sampling: Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal BM Sample Gear BMIBI score BMIBI Class 47a BMIBI BIT BMIBI Pass/ Fail 617 8/16/06 234 47a MO/WW ArtSub 50 Fair 54 Fail 364 8/6/03 261 47a MO/WW ArtSub 65 Good 54 Pass Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal Riffle Stream? FIBI score FIBI Class 47a FIBI BIT FIBI Pass/ Fail 617 8/16/06 234 47a MO/WW NA 22 Poor 43 Fail 364 8/7/03 261 47a MO/WW NA 18 Poor 43 Fail 355 7/30/03 44 47a MO/WW NA 37 Fair 43 Fail Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (1/2) Partial Fish Evaluated Fail (0/3) Partial Overall Evaluated Fail Partial 3bc 5bt Assessment
is evaluated because it was based on samples not collected in the last five
years. Class
BWW2 – Fish kill Assessment: The
Class BWW2 aquatic life use assessment based on the reoccurring fish kills
resulted in two Category 5b impairments because there were two distinct causes.
The fish kills were caused by a “pollutant” or were suspected to be caused by a
“pollutant”; therefore, the Class BWW2 use was considered impaired. Because the
sources of the pollutants were not identified and/or the enforcement actions
taken against the responsible party have not been resolved, the presumptive
Class BWW2use 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. More
details about the 2018 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/988 More
details about the 2007 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/731 More
details about the 2003 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/579 More
details about the September 2002 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/529 More
details about the January 2002 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/503