Boone River IA 04-UDM-1256
White Fox Cr to Otter Cr (Wright Co.)
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 6/11/2020 9:41:56 AM
- Updated
- 10/12/2020 10:10:29 AM
The Class A1 primary contact recreation use remains assessed as "partially supported" based on 2005 indicator bacteria (E. coli) monitoring data. The Class BWW1 aquatic life use was assessed as "partially supported" due to 2013 and 2015 fish kills. 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 WQ CY
2005 11400001 Boone
River At
Woolstock Class A1 - Indicator
Bacteria: Site
ID Data
Source ID #
Samples / # Years 2005
Geometric Mean Annual
Geometric Mean Violation #
Violations %
Violations Significantly
>10% Violations Assessment
Type Support
Level 11400001 6 5
/ 1 167 NA 1 20% NA Evaluated Partial The amount of data
available for this assessment (five samples) does not meet DNR guidelines for
Clean Water Act assessment and listing that require at least 10 samples be
collected per segment over a three-year period. Assessments based on data that
do not meet DNR assessment/listing guidelines are considered “evaluated”
(i.e., of lower confidence); these assessments are not appropriate for adding
waters to Iowa’s Section 303(d) list of impaired waters. Such assessments
are appropriate for addition of waters to IR subcategory 3b
and to Iowa’s list of waters in need of further investigation. Class BWW1 - Fish kill Assessment: Details about the 2013 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/898 Details about the 2015 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/891
The Class BWW1 aquatic life use assessment based on the 2013 and 2015 fish kills placed this segment in Category 5b. The fish kills were 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 kills, 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.