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Provisional Mean Flows for August 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
|
4,529
|
2,980
|
2,408
|
1,203
|
5,027
|
|
5446500
|
Rock River near Joslin [graph]
|
9,549
|
65
|
8,093
|
4,528
|
3,862
|
1,953
|
7,735
|
|
5435500
|
Pecatonica River at Freeport [graph]
|
1,326
|
89
|
1,534
|
727
|
595
|
312
|
1,253
|
|
5447500
|
Green River near Geneseo [graph]
|
1,003
|
69
|
1,115
|
383
|
234
|
99
|
989
|
|
5466500
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Edwards River near New Boston [graph]
|
445
|
70
|
391
|
157
|
78
|
20
|
316
|
|
5520500
|
Kankakee River at Momence [graph]
|
2,294
|
90
|
1,194
|
1,117
|
925
|
525
|
1,817
|
|
5526000
|
Iroquois River near Chebanse [graph]
|
2,091
|
84
|
130
|
480
|
248
|
56
|
1,314
|
|
5552500
|
Fox River at Dayton [graph]
|
2,642
|
88
|
2,059
|
989
|
617
|
287
|
2,040
|
|
5554500
|
Vermilion River at Pontiac [graph]
|
579
|
64
|
66
|
123
|
36
|
6
|
348
|
|
5570000
|
Spoon River at Seville [graph]
|
1,636
|
91
|
998
|
509
|
311
|
82
|
965
|
|
5585000
|
LaMoine River at Ripley [graph]
|
1,293
|
84
|
897
|
346
|
174
|
35
|
971
|
|
5495500
|
Bear Creek near Marcelline [graph]
|
349
|
63
|
418
|
93
|
45
|
1
|
279
|
|
5567500
|
Mackinaw River near Congerville [graph]
|
767
|
59
|
118
|
168
|
59
|
13
|
266
|
|
5582000
|
Salt Creek near Greenview [graph]
|
1,804
|
66
|
798
|
646
|
363
|
160
|
1,226
|
|
5572000
|
Sangamon River at Monticello [graph]
|
550
|
95
|
195
|
146
|
54
|
12
|
378
|
|
5576000
|
So. Fork Sangamon near Rochester [graph]
|
867
|
58
|
52
|
221
|
53
|
7
|
512
|
|
5586100
|
Illinois River at Valley City [graph]
|
26,743
|
69
|
14,818
|
13,630
|
11,583
|
7,032
|
22,381
|
|
5587000
|
Macoupin Creek near Kane [graph]
|
868
|
79
|
96
|
194
|
68
|
14
|
421
|
|
3339000
|
Vermilion River near Danville [graph]
|
1,290
|
86
|
288
|
416
|
158
|
48
|
1,143
|
|
5592500
|
Kaskaskia River at Vandalia [graph]
|
1,940
|
38
|
1,780
|
811
|
472
|
65
|
2,045
|
|
5594000
|
Shoal Creek near Breese [graph]
|
735
|
64
|
73
|
174
|
64
|
15
|
456
|
|
3345500
|
Embarras River at Ste. Marie [graph]
|
1,516
|
94
|
340
|
413
|
163
|
59
|
893
|
|
3380500
|
Skillet Fork at Wayne City [graph]
|
464
|
88
|
N/A
|
116
|
19
|
1
|
345
|
|
3379500
|
Little Wabash below Clay City [graph]
|
1,131
|
93
|
124
|
321
|
94
|
16
|
656
|
|
5597000
|
Big Muddy at Plumfield [graph]
|
794
|
37
|
748
|
211
|
178
|
43
|
424
|
|
3612000
|
Cache River at Forman [graph]
|
244
|
84
|
72
|
70
|
24
|
4
|
196
|
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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