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Provisional Mean Flows for May 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
|
11,780
|
5,432
|
4,970
|
2,397
|
8,400
|
|
5446500
|
Rock River near Joslin [graph]
|
9,549
|
65
|
18,890
|
8,571
|
7,819
|
3,601
|
14,440
|
|
5435500
|
Pecatonica River at Freeport [graph]
|
1,326
|
89
|
1,695
|
1,021
|
837
|
451
|
1,676
|
|
5447500
|
Green River near Geneseo [graph]
|
1,003
|
69
|
2,270
|
985
|
826
|
301
|
1,899
|
|
5466500
|
Edwards River near New Boston [graph]
|
445
|
70
|
1,360
|
498
|
329
|
120
|
1,081
|
|
5520500
|
Kankakee River at Momence [graph]
|
2,294
|
90
|
4,840
|
2,888
|
2,778
|
1,449
|
4,404
|
|
5526000
|
Iroquois River near Chebanse [graph]
|
2,091
|
84
|
5,176
|
2,675
|
2,129
|
629
|
4,955
|
|
5552500
|
Fox River at Dayton [graph]
|
2,642
|
88
|
5,459
|
2,469
|
2,110
|
793
|
4,381
|
|
5554500
|
Vermilion River at Pontiac [graph]
|
579
|
64
|
1,730
|
725
|
576
|
175
|
1,645
|
|
5570000
|
Spoon River at Seville [graph]
|
1,636
|
91
|
8,370
|
1,736
|
1,231
|
397
|
4,214
|
|
5585000
|
LaMoine River at Ripley [graph]
|
1,293
|
84
|
6,320
|
1,394
|
808
|
206
|
3,371
|
|
5495500
|
Bear Creek near Marcelline [graph]
|
349
|
63
|
1,141
|
399
|
183
|
21
|
992
|
|
5567500
|
Mackinaw River near Congerville [graph]
|
767
|
59
|
2,140
|
907
|
720
|
226
|
1,707
|
|
5582000
|
Salt Creek near Greenview [graph]
|
1,804
|
66
|
5,495
|
2,393
|
1,731
|
624
|
5,164
|
|
5572000
|
Sangamon River at Monticello [graph]
|
550
|
95
|
1,488
|
715
|
477
|
177
|
1,591
|
|
5576000
|
So. Fork Sangamon near Rochester [graph]
|
867
|
58
|
3,370
|
1,026
|
483
|
141
|
2,340
|
|
5586100
|
Illinois River at Valley City [graph]
|
26,743
|
69
|
85,940
|
36,060
|
34,490
|
15,248
|
65,023
|
|
5587000
|
Macoupin Creek near Kane [graph]
|
868
|
79
|
1,697
|
915
|
365
|
74
|
2,801
|
|
3339000
|
Vermilion River near Danville [graph]
|
1,290
|
86
|
4,560
|
1,656
|
1,243
|
476
|
3,864
|
|
5592500
|
Kaskaskia River at Vandalia [graph]
|
1,940
|
38
|
3,775
|
1,998
|
1,512
|
170
|
4,913
|
|
5594000
|
Shoal Creek near Breese [graph]
|
735
|
64
|
1,575
|
836
|
438
|
74
|
2,013
|
|
3345500
|
Embarras River at Ste. Marie [graph]
|
1,516
|
94
|
5,715
|
1,925
|
1,130
|
338
|
4,487
|
|
3380500
|
Skillet Fork at Wayne City [graph]
|
464
|
88
|
2,204
|
632
|
245
|
32
|
2,021
|
|
3379500
|
Little Wabash below Clay City [graph]
|
1,131
|
93
|
3,450
|
1,429
|
647
|
88
|
4,670
|
|
5597000
|
Big Muddy at Plumfield [graph]
|
794
|
37
|
3,280
|
1,346
|
892
|
206
|
3,961
|
|
3612000
|
Cache River at Forman [graph]
|
244
|
84
|
918
|
426
|
302
|
27
|
1,031
|
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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