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Provisional Mean Flows for September 2009 Choose another month
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Long-term
monthly flows for period of record (cfs) |
| Station No. |
Station |
Drainage area
(sq. mi.) |
Years of record |
Monthly
mean flow (cfs) |
Mean flow* |
Median (50% exceedence) flow |
90% exceedence flow |
10% exceedence flow |
|
5437500
|
Rock River at Rockton [graph]
|
6,363
|
73
|
3,614
|
2,964
|
2,706
|
1,161
|
5,833
|
|
5446500
|
Rock River near Joslin [graph]
|
9,549
|
65
|
5,913
|
4,300
|
3,782
|
1,686
|
7,952
|
|
5435500
|
Pecatonica River at Freeport [graph]
|
1,326
|
89
|
1,191
|
763
|
650
|
289
|
1,463
|
|
5447500
|
Green River near Geneseo [graph]
|
1,003
|
69
|
672
|
327
|
155
|
61
|
873
|
|
5466500
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Edwards River near New Boston [graph]
|
445
|
70
|
156
|
121
|
49
|
15
|
304
|
|
5520500
|
Kankakee River at Momence [graph]
|
2,294
|
90
|
1,381
|
1,010
|
761
|
550
|
1,785
|
|
5526000
|
Iroquois River near Chebanse [graph]
|
2,091
|
84
|
117
|
563
|
128
|
44
|
872
|
|
5552500
|
Fox River at Dayton [graph]
|
2,642
|
88
|
1,381
|
986
|
624
|
256
|
2,490
|
|
5554500
|
Vermilion River at Pontiac [graph]
|
579
|
64
|
25
|
111
|
17
|
2
|
224
|
|
5570000
|
Spoon River at Seville [graph]
|
1,636
|
91
|
301
|
579
|
191
|
54
|
1,027
|
|
5585000
|
LaMoine River at Ripley [graph]
|
1,293
|
84
|
193
|
417
|
121
|
23
|
607
|
|
5495500
|
Bear Creek near Marcelline [graph]
|
349
|
63
|
21
|
146
|
18
|
0
|
384
|
|
5567500
|
Mackinaw River near Congerville [graph]
|
767
|
59
|
51
|
204
|
23
|
5
|
385
|
|
5582000
|
Salt Creek near Greenview [graph]
|
1,804
|
66
|
452
|
406
|
197
|
94
|
850
|
|
5572000
|
Sangamon River at Monticello [graph]
|
550
|
95
|
96
|
111
|
26
|
8
|
290
|
|
5576000
|
So. Fork Sangamon near Rochester [graph]
|
867
|
58
|
51
|
134
|
23
|
3
|
242
|
|
5586100
|
Illinois River at Valley City [graph]
|
26,743
|
69
|
12,100
|
11,500
|
8,119
|
6,291
|
24,875
|
|
5587000
|
Macoupin Creek near Kane [graph]
|
868
|
79
|
147
|
171
|
47
|
6
|
386
|
|
3339000
|
Vermilion River near Danville [graph]
|
1,290
|
86
|
109
|
279
|
109
|
36
|
710
|
|
5592500
|
Kaskaskia River at Vandalia [graph]
|
1,940
|
38
|
703
|
513
|
280
|
39
|
1,811
|
|
5594000
|
Shoal Creek near Breese [graph]
|
735
|
64
|
38
|
133
|
37
|
11
|
329
|
|
3345500
|
Embarras River at Ste. Marie [graph]
|
1,516
|
94
|
90
|
368
|
110
|
37
|
959
|
|
3380500
|
Skillet Fork at Wayne City [graph]
|
464
|
88
|
N/A
|
72
|
20
|
1
|
185
|
|
3379500
|
Little Wabash below Clay City [graph]
|
1,131
|
93
|
30
|
207
|
62
|
8
|
542
|
|
5597000
|
Big Muddy at Plumfield [graph]
|
794
|
37
|
417
|
133
|
94
|
42
|
239
|
|
3612000
|
Cache River at Forman [graph]
|
244
|
84
|
39
|
61
|
14
|
1
|
195
|
Choose another month
Station Numbers are linked to the U.S. Geological Survey, providing more information about each station.
Notes:
Much below normal flow = 90-100% chance of exceedence.
Below normal flow = 70-90% chance of exceedence.
Normal flow = 30-70% chance of exceedence.
Above normal flow = 10-30% chance of exceedence.
Much above normal flow = 0-10% chance of exceedence.
* As reported in U.S. Geological Survey (USGS) Water Resources Data, Illinois, Water Year 2007.
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