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Provisional Mean Flows for July 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
|
4,603
|
3,712
|
2,844
|
1,425
|
6,568
|
|
5446500
|
Rock River near Joslin [graph]
|
9,549
|
65
|
9,180
|
5,845
|
4,633
|
2,351
|
11,279
|
|
5435500
|
Pecatonica River at Freeport [graph]
|
1,326
|
89
|
1,163
|
902
|
685
|
355
|
1,381
|
|
5447500
|
Green River near Geneseo [graph]
|
1,003
|
69
|
1,400
|
552
|
407
|
175
|
1,073
|
|
5466500
|
Edwards River near New Boston [graph]
|
445
|
70
|
865
|
291
|
165
|
47
|
601
|
|
5520500
|
Kankakee River at Momence [graph]
|
2,294
|
90
|
1,286
|
1,501
|
1,299
|
729
|
2,588
|
|
5526000
|
Iroquois River near Chebanse [graph]
|
2,091
|
84
|
424
|
1,296
|
715
|
139
|
2,992
|
|
5552500
|
Fox River at Dayton [graph]
|
2,642
|
88
|
1,911
|
1,260
|
925
|
379
|
2,630
|
|
5554500
|
Vermilion River at Pontiac [graph]
|
579
|
64
|
190
|
323
|
176
|
29
|
734
|
|
5570000
|
Spoon River at Seville [graph]
|
1,636
|
91
|
2,300
|
1,012
|
607
|
184
|
2,102
|
|
5585000
|
LaMoine River at Ripley [graph]
|
1,293
|
84
|
459
|
752
|
342
|
62
|
1,902
|
|
5495500
|
Bear Creek near Marcelline [graph]
|
349
|
63
|
30
|
257
|
98
|
4
|
822
|
|
5567500
|
Mackinaw River near Congerville [graph]
|
767
|
59
|
307
|
358
|
212
|
36
|
950
|
|
5582000
|
Salt Creek near Greenview [graph]
|
1,804
|
66
|
1,329
|
1,181
|
764
|
216
|
3,039
|
|
5572000
|
Sangamon River at Monticello [graph]
|
550
|
95
|
262
|
280
|
165
|
27
|
670
|
|
5576000
|
So. Fork Sangamon near Rochester [graph]
|
867
|
58
|
227
|
353
|
157
|
24
|
964
|
|
5586100
|
Illinois River at Valley City [graph]
|
26,743
|
69
|
30,500
|
21,040
|
18,650
|
8,704
|
40,548
|
|
5587000
|
Macoupin Creek near Kane [graph]
|
868
|
79
|
499
|
307
|
123
|
19
|
888
|
|
3339000
|
Vermilion River near Danville [graph]
|
1,290
|
86
|
619
|
779
|
470
|
73
|
1,760
|
|
5592500
|
Kaskaskia River at Vandalia [graph]
|
1,940
|
38
|
2,383
|
1,214
|
1,026
|
124
|
2,221
|
|
5594000
|
Shoal Creek near Breese [graph]
|
735
|
64
|
480
|
293
|
111
|
27
|
831
|
|
3345500
|
Embarras River at Ste. Marie [graph]
|
1,516
|
94
|
984
|
732
|
419
|
106
|
1,804
|
|
3380500
|
Skillet Fork at Wayne City [graph]
|
464
|
88
|
N/A
|
152
|
55
|
4
|
377
|
|
3379500
|
Little Wabash below Clay City [graph]
|
1,131
|
93
|
348
|
464
|
201
|
27
|
1,201
|
|
5597000
|
Big Muddy at Plumfield [graph]
|
794
|
37
|
1,384
|
395
|
379
|
75
|
698
|
|
3612000
|
Cache River at Forman [graph]
|
244
|
84
|
169
|
86
|
37
|
5
|
171
|
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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