| |
Long-term
monthly flows for period of record (cfs) | |
| Station |
Drainage area
(sq. mi.) |
Years of record |
Monthly
mean flow (cfs) |
Mean flow* |
Median (50% exceedence) flow |
90% exceedence flow |
10% exceedence flow |
USGS
Station No. |
|
Rock River at Rockton
|
6,363
|
86
|
N/A
|
3,628
|
3,190
|
1,406
|
6,916
|
5437500
|
|
Rock River near Joslin
|
9,549
|
86
|
N/A
|
6,002
|
5,215
|
2,052
|
12,860
|
5446500
|
|
Pecatonica River at Freeport
|
1,326
|
111
|
N/A
|
819
|
667
|
320
|
1,663
|
5435500
|
|
Green River near Geneseo
|
1,003
|
90
|
N/A
|
590
|
411
|
103
|
1,429
|
5447500
|
|
Edwards River near New Boston
|
445
|
91
|
N/A
|
250
|
140
|
27
|
635
|
5466500
|
|
Kankakee River at Momence
|
2,294
|
113
|
N/A
|
2,366
|
2,203
|
834
|
4,624
|
5520500
|
|
Iroquois River near Chebanse
|
2,091
|
102
|
N/A
|
2,101
|
1,640
|
151
|
4,794
|
5526000
|
|
Fox River at Dayton
|
2,642
|
111
|
N/A
|
1,622
|
1,230
|
440
|
3,333
|
5552500
|
|
Vermilion River at Pontiac
|
579
|
83
|
N/A
|
437
|
258
|
11
|
1,222
|
5554500
|
|
Spoon River at Seville
|
1,636
|
111
|
N/A
|
1,029
|
651
|
86
|
2,908
|
5570000
|
|
LaMoine River at Ripley
|
1,293
|
104
|
N/A
|
633
|
343
|
35
|
1,601
|
5585000
|
|
Bear Creek near Marcelline
|
349
|
82
|
N/A
|
148
|
64
|
4
|
436
|
5495500
|
|
Mackinaw River near Congerville
|
767
|
81
|
N/A
|
531
|
274
|
26
|
1,488
|
5567500
|
|
Salt Creek near Greenview
|
1,804
|
84
|
N/A
|
1,324
|
835
|
134
|
3,377
|
5582000
|
|
Sangamon River at Monticello
|
550
|
116
|
4
|
454
|
267
|
19
|
1,213
|
5572000
|
|
So. Fork Sangamon near Rochester
|
867
|
76
|
7
|
695
|
366
|
10
|
2,340
|
5576000
|
|
Illinois River at Valley City
|
26,743
|
87
|
9,800
|
21,956
|
17,030
|
6,760
|
47,630
|
5586100
|
|
Macoupin Creek near Kane
|
868
|
97
|
N/A
|
572
|
255
|
7
|
1,623
|
5587000
|
|
Vermilion River near Danville
|
1,290
|
104
|
N/A
|
1,247
|
819
|
58
|
3,099
|
3339000
|
|
Kaskaskia River at Vandalia
|
1,940
|
56
|
N/A
|
2,601
|
2,029
|
271
|
5,338
|
5592500
|
|
Shoal Creek near Breese
|
735
|
83
|
44
|
743
|
429
|
30
|
2,068
|
5594000
|
|
Embarras River at Ste. Marie
|
1,516
|
114
|
N/A
|
1,765
|
1,121
|
91
|
4,590
|
3345500
|
|
Skillet Fork at Wayne City
|
464
|
108
|
12
|
671
|
381
|
15
|
1,965
|
3380500
|
|
Little Wabash below Clay City
|
1,131
|
111
|
N/A
|
1,485
|
793
|
52
|
4,367
|
3379500
|
|
Big Muddy at Plumfield
|
794
|
55
|
N/A
|
910
|
735
|
97
|
2,184
|
5597000
|
|
Cache River at Forman
|
244
|
103
|
N/A
|
513
|
393
|
41
|
1,228
|
3612000
|
