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Provisional Mean Flows for December 2008 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
|
6,920
|
3,318
|
3,056
|
1,288
|
5,383
|
|
5446500
|
Rock River near Joslin [graph]
|
9,549
|
65
|
14,600
|
5,050
|
4,865
|
1,968
|
8,878
|
|
5435500
|
Pecatonica River at Freeport [graph]
|
1,326
|
89
|
1,123
|
684
|
579
|
302
|
1,261
|
|
5447500
|
Green River near Geneseo [graph]
|
1,003
|
69
|
2,372
|
472
|
353
|
82
|
961
|
|
5466500
|
Edwards River near New Boston [graph]
|
445
|
70
|
N/A
|
180
|
102
|
18
|
398
|
|
5520500
|
Kankakee River at Momence [graph]
|
2,294
|
90
|
4,742
|
2,019
|
1,719
|
826
|
3,780
|
|
5526000
|
Iroquois River near Chebanse [graph]
|
2,091
|
84
|
3,600
|
1,601
|
969
|
123
|
4,045
|
|
5552500
|
Fox River at Dayton [graph]
|
2,642
|
88
|
4,491
|
1,507
|
1,240
|
480
|
2,951
|
|
5554500
|
Vermilion River at Pontiac [graph]
|
579
|
64
|
1,050
|
358
|
156
|
6
|
1,026
|
|
5570000
|
Spoon River at Seville [graph]
|
1,636
|
91
|
2,900
|
677
|
400
|
65
|
1,401
|
|
5585000
|
LaMoine River at Ripley [graph]
|
1,293
|
84
|
1,653
|
506
|
251
|
33
|
1,161
|
|
5495500
|
Bear Creek near Marcelline [graph]
|
349
|
63
|
650
|
147
|
35
|
1
|
411
|
|
5567500
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Mackinaw River near Congerville [graph]
|
767
|
59
|
1,710
|
412
|
184
|
13
|
1,168
|
|
5582000
|
Salt Creek near Greenview [graph]
|
1,804
|
66
|
2,553
|
1,074
|
562
|
101
|
2,650
|
|
5572000
|
Sangamon River at Monticello [graph]
|
550
|
95
|
897
|
357
|
183
|
12
|
1,054
|
|
5576000
|
So. Fork Sangamon near Rochester [graph]
|
867
|
58
|
1,030
|
556
|
136
|
9
|
1,642
|
|
5586100
|
Illinois River at Valley City [graph]
|
26,743
|
69
|
22,900
|
18,170
|
14,937
|
6,722
|
36,545
|
|
5587000
|
Macoupin Creek near Kane [graph]
|
868
|
79
|
1,572
|
462
|
151
|
8
|
1,341
|
|
3339000
|
Vermilion River near Danville [graph]
|
1,290
|
86
|
2,600
|
916
|
498
|
56
|
2,622
|
|
5592500
|
Kaskaskia River at Vandalia [graph]
|
1,940
|
38
|
3,340
|
1,987
|
1,539
|
199
|
4,917
|
|
5594000
|
Shoal Creek near Breese [graph]
|
735
|
64
|
1,258
|
563
|
181
|
17
|
1,714
|
|
3345500
|
Embarras River at Ste. Marie [graph]
|
1,516
|
94
|
2,240
|
1,270
|
777
|
35
|
3,457
|
|
3380500
|
Skillet Fork at Wayne City [graph]
|
464
|
88
|
692
|
422
|
227
|
4
|
1,169
|
|
3379500
|
Little Wabash below Clay City [graph]
|
1,131
|
93
|
1,500
|
1,025
|
478
|
22
|
2,681
|
|
5597000
|
Big Muddy at Plumfield [graph]
|
794
|
37
|
157
|
671
|
278
|
40
|
1,877
|
|
3612000
|
Cache River at Forman [graph]
|
244
|
84
|
234
|
340
|
213
|
12
|
855
|
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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