Provisional Monthly Streamflow Network - Tabular Data: October 2025
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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 |
85 |
3,001 |
3,619 |
3,049 |
1,093 |
6,262 |
|
| Rock River near Joslin |
9,549 |
85 |
3,383 |
5,168 |
4,268 |
1,665 |
8,879 |
|
| Pecatonica River at Freeport |
1,326 |
110 |
701 |
808 |
664 |
319 |
1,371 |
|
| Green River near Geneseo |
1,003 |
89 |
86 |
403 |
218 |
67 |
978 |
|
| Edwards River near New Boston |
445 |
90 |
28 |
148 |
48 |
13 |
456 |
|
| Kankakee River at Momence |
2,294 |
111 |
1,028 |
1,282 |
922 |
599 |
2,646 |
|
| Iroquois River near Chebanse |
2,091 |
102 |
78 |
747 |
232 |
63 |
2,035 |
|
| Fox River at Dayton |
2,642 |
110 |
774 |
1,259 |
898 |
340 |
2,365 |
|
| Vermilion River at Pontiac |
579 |
82 |
0 |
169 |
27 |
3 |
637 |
|
| Spoon River at Seville |
1,636 |
111 |
64 |
534 |
177 |
58 |
1,407 |
|
| LaMoine River at Ripley |
1,293 |
104 |
20 |
433 |
112 |
22 |
1,584 |
|
| Bear Creek near Marcelline |
349 |
81 |
3 |
123 |
13 |
1 |
492 |
|
| Mackinaw River near Congerville |
767 |
80 |
10 |
211 |
30 |
9 |
700 |
|
| Salt Creek near Greenview |
1,804 |
83 |
125 |
544 |
221 |
111 |
1,698 |
|
| Sangamon River at Monticello |
550 |
116 |
0 |
175 |
34 |
6 |
600 |
|
| So. Fork Sangamon near Rochester |
867 |
76 |
9 |
199 |
25 |
2 |
623 |
|
| Illinois River at Valley City |
26,743 |
86 |
6,772 |
13,160 |
8,067 |
5,617 |
30,100 |
|
| Macoupin Creek near Kane |
868 |
97 |
15 |
245 |
38 |
6 |
663 |
|
| Vermilion River near Danville |
1,290 |
104 |
53 |
379 |
108 |
44 |
1,133 |
|
| Kaskaskia River at Vandalia |
1,940 |
55 |
102 |
552 |
177 |
53 |
1,781 |
|
| Shoal Creek near Breese |
735 |
83 |
58 |
184 |
48 |
10 |
716 |
|
| Embarras River at Ste. Marie |
1,516 |
113 |
42 |
427 |
108 |
30 |
1,227 |
|
| Skillet Fork at Wayne City |
464 |
108 |
39 |
105 |
12 |
0 |
379 |
|
| Little Wabash below Clay City |
1,131 |
111 |
107 |
234 |
52 |
7 |
814 |
|
| Big Muddy at Plumfield |
794 |
54 |
60 |
155 |
77 |
34 |
464 |
|
| Cache River at Forman |
244 |
101 |
91 |
61 |
17 |
1 |
195 |
|
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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 2024. For best results when printing this page, change your layout to "Landscape". Streamflow Data |