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Provisional Mean Flows for April 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
|
12,670
|
7,329
|
6,715
|
3,076
|
12,440
|
|
5446500
|
Rock River near Joslin [graph]
|
9,549
|
65
|
18,720
|
10,710
|
9,436
|
4,528
|
18,707
|
|
5435500
|
Pecatonica River at Freeport [graph]
|
1,326
|
89
|
1,720
|
1,221
|
1,015
|
505
|
2,175
|
|
5447500
|
Green River near Geneseo [graph]
|
1,003
|
69
|
2,376
|
1,046
|
959
|
379
|
1,797
|
|
5466500
|
Edwards River near New Boston [graph]
|
445
|
70
|
873
|
538
|
386
|
156
|
1,118
|
|
5520500
|
Kankakee River at Momence [graph]
|
2,294
|
90
|
6,293
|
3,441
|
3,469
|
1,750
|
5,265
|
|
5526000
|
Iroquois River near Chebanse [graph]
|
2,091
|
84
|
5,181
|
3,172
|
3,054
|
936
|
5,945
|
|
5552500
|
Fox River at Dayton [graph]
|
2,642
|
88
|
5,029
|
3,244
|
2,745
|
1,137
|
5,210
|
|
5554500
|
Vermilion River at Pontiac [graph]
|
579
|
64
|
1,682
|
804
|
673
|
190
|
1,612
|
|
5570000
|
Spoon River at Seville [graph]
|
1,636
|
91
|
5,173
|
1,837
|
1,527
|
395
|
3,830
|
|
5585000
|
LaMoine River at Ripley [graph]
|
1,293
|
84
|
3,248
|
1,544
|
1,234
|
246
|
3,284
|
|
5495500
|
Bear Creek near Marcelline [graph]
|
349
|
63
|
878
|
402
|
304
|
32
|
817
|
|
5567500
|
Mackinaw River near Congerville [graph]
|
767
|
59
|
2,119
|
1,041
|
949
|
233
|
1,984
|
|
5582000
|
Salt Creek near Greenview [graph]
|
1,804
|
66
|
3,988
|
2,388
|
1,955
|
771
|
4,541
|
|
5572000
|
Sangamon River at Monticello [graph]
|
550
|
95
|
962
|
797
|
682
|
187
|
1,648
|
|
5576000
|
So. Fork Sangamon near Rochester [graph]
|
867
|
58
|
1,885
|
1,030
|
707
|
141
|
2,243
|
|
5586100
|
Illinois River at Valley City [graph]
|
26,743
|
69
|
70,530
|
36,850
|
33,570
|
15,297
|
61,280
|
|
5587000
|
Macoupin Creek near Kane [graph]
|
868
|
79
|
1,312
|
1,107
|
541
|
113
|
2,864
|
|
3339000
|
Vermilion River near Danville [graph]
|
1,290
|
86
|
2,881
|
1,839
|
1,571
|
471
|
3,728
|
|
5592500
|
Kaskaskia River at Vandalia [graph]
|
1,940
|
38
|
3,805
|
2,395
|
1,903
|
286
|
4,633
|
|
5594000
|
Shoal Creek near Breese [graph]
|
735
|
64
|
1,700
|
932
|
623
|
155
|
2,194
|
|
3345500
|
Embarras River at Ste. Marie [graph]
|
1,516
|
94
|
4,773
|
2,170
|
1,663
|
509
|
4,762
|
|
3380500
|
Skillet Fork at Wayne City [graph]
|
464
|
88
|
2,458
|
762
|
598
|
108
|
1,743
|
|
3379500
|
Little Wabash below Clay City [graph]
|
1,131
|
93
|
3,302
|
1,602
|
1,091
|
177
|
3,570
|
|
5597000
|
Big Muddy at Plumfield [graph]
|
794
|
37
|
1,777
|
1,408
|
1,033
|
346
|
3,013
|
|
3612000
|
Cache River at Forman [graph]
|
244
|
84
|
803
|
552
|
491
|
117
|
1,144
|
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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