Illinois EPA and Indiana DEM Kankakee/Iroquois Watershed TMDL Report
Final 137
7.1.1.4 Robbins Ditch-Kankakee River Subwatershed (10-Digit HUC 107)
The Robbins Ditch subwatershed has an area of nearly 118 square miles. Walkerton and Koontz Lake are
the two designated cities located in this subwatershed (Figure 55). Land use comprise of agriculture
(67%), forest (17%), developed (8%) and the remaining land categories contribute to eight percent of the
total subwatershed area (Table 94). A total of three NPDES facilities and one CAFO are present within
this subwatershed as shown in Figure 56 and Figure 57, respectively.
There are two segments impaired for E. coli and IDEM sampled five E. coli monitoring locations in 2008
as shown in Table 91 and Table 92, respectively. The summary of 2008 data in the subwatershed is shown
in Table 93. All five sites exceed the geomean standard. Reductions to meet the geomean criteria of 125
#/100 mL range from 39 to 81 percent.
Table 91. 303 (d) Listed Streams in the Robbins Ditch-Kankakee River
HUC 12 HUC 12 Name Segment ID Waterbody
Stream
Length
(miles)
Parameter
705 Laramore Ditch Kankakee River INK0147_T1009 Kankakee River 7.29 E. coli
INK0146_T1008 Kankakee River 1.39 E. coli
Table 92. Station Locations in the Robbins Ditch-Kankakee River
HUC 12 HUC 12 Name Station # Stream Name
701 Jain Ditch ID# 61 Jain D
702 Amy Kelly Ditch-Robbins Ditch ID# 59 Robbins D
703 Shearin Ditch-Robbins Ditch ID# 23 Robbins D
704 Bailey Ditch-Kankakee River ID# 21 Bailey D
705 Laramore Ditch-Kankakee River ID# 11 Kankakee R
Table 93. Summary of Pathogen Data in the Robbins Ditch-Kankakee River
Percent of
Samples
Exceeding E. coli
Station # Period of Record WQS (#/100 mL)
Total
Number of
Samples
125 235
Minimum
(#/
100 mL)
Geomean (#/
100 mL)
Average
(#/
100 mL)
Maximum
(#/
100 mL)
Percent
Reduction
Based
on
Geomean
(125/
100mL)
61 6/4/2008 - 7/2/2008 5 100 40 152 205 211 261 39%
59 6/4/2008 - 7/2/2008 5 100 80 185 243 246 276 49%
23 6/2/2008 - 7/14/2008 6 83 67 105 284 416 1,414 56%
21 6/2/2008 - 7/14/2008 6 100 100 276 662 848 2,419 81%
11 6/2/2008 - 6/30/2008 5 100 80 192 334 368 579 63%
