The presumptive Class A1 use remains assessed as "partially supported" due to levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The presumptive Class BWW1 use remains assessed as “partially supported” based on multiple fish kill investigations and on biological sampling data.
Sources of Data:
|
Data Source
|
Data Source ID
|
Data Type
|
Data Age
|
Site ID
|
Site Name
|
Site Description
|
|
Iowa DNR
|
6
|
WQ
|
CY 2008 – 2009
|
11400004
|
Long Dick Creek near
Ellsworth
|
Site ldc-2
|
|
Iowa DNR
|
6
|
BIO
|
See Below
|
691
|
Long Dick Creek
|
Ellsworth – LDC2
|
Presumptive
Class A1 - Indicator Bacteria: Historical
|
Site ID
|
Data Source ID
|
# Samples / # Years
|
2008 Geometric Mean
|
2009 Geometric Mean
|
Annual Geometric Mean
Violation
|
# Violations
|
% Violations
|
Significantly >10%
Violations
|
Assessment Type
|
Support Level
|
|
11400004
|
6
|
26 / 2
|
369
|
175
|
Yes
|
15
|
58%
|
Yes
|
Evaluated
|
Partial
|
Presumptive
Class BWW1 - Biological Sampling:
Benthic
Macroinvertebrates:
|
BioNet Site ID
|
Date
|
Drainage Area (mi2)
|
Ecoregion
|
Major Drainage/ Thermal
|
BM Sample Gear
|
BMIBI score
|
BMIBI Class
|
47b BMIBI BIT
|
BMIBI Pass/ Fail
|
|
691
|
10/6/08
|
16
|
47b
|
MS/WW
|
ArtSub
|
71
|
Good
|
62
|
Pass
|
Fish:
|
BioNet Site ID
|
Date
|
Drainage Area (mi2)
|
Ecoregion
|
Major Drainage/ Thermal
|
Riffle Stream?
|
FIBI score
|
FIBI Class
|
47b FIBI BIT
|
FIBI Pass/ Fail
|
|
691
|
10/6/08
|
16
|
47b
|
MS/WW
|
Yes
|
24
|
Poor
|
53
|
Fail
|
Overall:
|
Community
|
Assessment Type
|
Assessment Result
|
Support Level
|
Earned IR Category
|
Actual IR Category
|
Reason
|
|
Benthic
Macroinvertebrates
|
Evaluated
|
Pass (1/1)
|
Full
|
|
|
|
|
Fish
|
Evaluated
|
Fail (0/1)
|
Not
|
|
|
|
|
Overall
|
Evaluated
|
Fail
|
Partial
|
3bu
|
3bu
|
Assessment
was evaluated because the drainage area of the site was smaller than the
calibrated range.
|
Presumptive Class BWW1 – Fish kill
Assessment:
The presumptive Class BWW1 aquatic life use assessment based on the 2004
and 2011 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 presumptive
Class BWW1
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 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.
More details about the 2011 fish kill can be found here: https://programs.iowadnr.gov/fishkill/Events/834
More details about the 2004 fish kill can be found here: https://programs.iowadnr.gov/fishkill/Events/599
