Provisional Monthly Streamflow Network - Tabular Data: November 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 |
2,810 |
3,874 |
3,451 |
1,397 |
6,917 |
|
| Rock River near Joslin |
9,549 |
85 |
3,590 |
5,645 |
4,996 |
2,067 |
10,120 |
|
| Pecatonica River at Freeport |
1,326 |
110 |
651 |
813 |
698 |
336 |
1,380 |
|
| Green River near Geneseo |
1,003 |
89 |
102 |
459 |
331 |
82 |
1,195 |
|
| Edwards River near New Boston |
445 |
90 |
32 |
166 |
83 |
20 |
417 |
|
| Kankakee River at Momence |
2,294 |
111 |
1,206 |
1,623 |
1,273 |
704 |
2,880 |
|
| Iroquois River near Chebanse |
2,091 |
102 |
111 |
996 |
503 |
97 |
2,598 |
|
| Fox River at Dayton |
2,642 |
110 |
916 |
1,573 |
1,375 |
518 |
3,130 |
|
| Vermilion River at Pontiac |
579 |
82 |
5 |
245 |
70 |
7 |
764 |
|
| Spoon River at Seville |
1,636 |
111 |
92 |
612 |
329 |
65 |
1,585 |
|
| LaMoine River at Ripley |
1,293 |
104 |
18 |
510 |
180 |
24 |
1,280 |
|
| Bear Creek near Marcelline |
349 |
81 |
N/A |
145 |
22 |
1 |
356 |
|
| Mackinaw River near Congerville |
767 |
80 |
9 |
291 |
75 |
13 |
789 |
|
| Salt Creek near Greenview |
1,804 |
83 |
134 |
820 |
347 |
121 |
2,405 |
|
| Sangamon River at Monticello |
550 |
116 |
0 |
248 |
86 |
9 |
771 |
|
| So. Fork Sangamon near Rochester |
867 |
76 |
2 |
297 |
73 |
4 |
807 |
|
| Illinois River at Valley City |
26,743 |
86 |
4,544 |
15,176 |
11,525 |
5,949 |
34,520 |
|
| Macoupin Creek near Kane |
868 |
97 |
18 |
322 |
90 |
8 |
847 |
|
| Vermilion River near Danville |
1,290 |
104 |
62 |
627 |
307 |
53 |
1,355 |
|
| Kaskaskia River at Vandalia |
1,940 |
55 |
90 |
876 |
644 |
65 |
2,239 |
|
| Shoal Creek near Breese |
735 |
83 |
25 |
334 |
139 |
18 |
928 |
|
| Embarras River at Ste. Marie |
1,516 |
113 |
32 |
724 |
326 |
29 |
1,817 |
|
| Skillet Fork at Wayne City |
464 |
108 |
8 |
267 |
90 |
2 |
771 |
|
| Little Wabash below Clay City |
1,131 |
111 |
54 |
582 |
261 |
14 |
1,630 |
|
| Big Muddy at Plumfield |
794 |
54 |
59 |
373 |
144 |
42 |
1,063 |
|
| Cache River at Forman |
244 |
101 |
109 |
192 |
81 |
4 |
571 |
|
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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 |