Provisional Monthly Streamflow Network - Tabular Data: December 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 |
86 |
3,084 |
3,706 |
3,311 |
1,288 |
6,242 |
|
| Rock River near Joslin |
9,549 |
86 |
4,987 |
5,703 |
5,185 |
1,984 |
10,200 |
|
| Pecatonica River at Freeport |
1,326 |
111 |
704 |
761 |
637 |
305 |
1,426 |
|
| Green River near Geneseo |
1,003 |
89 |
N/A |
529 |
423 |
87 |
1,373 |
|
| Edwards River near New Boston |
445 |
91 |
N/A |
203 |
120 |
18 |
432 |
|
| Kankakee River at Momence |
2,294 |
110 |
N/A |
2,061 |
1,802 |
857 |
3,780 |
|
| Iroquois River near Chebanse |
2,091 |
102 |
N/A |
1,612 |
1,115 |
134 |
4,045 |
|
| Fox River at Dayton |
2,642 |
111 |
N/A |
1,644 |
1,384 |
496 |
3,401 |
|
| Vermilion River at Pontiac |
579 |
83 |
N/A |
387 |
160 |
8 |
1,070 |
|
| Spoon River at Seville |
1,636 |
111 |
143 |
733 |
400 |
65 |
1,790 |
|
| LaMoine River at Ripley |
1,293 |
104 |
N/A |
537 |
229 |
28 |
1,472 |
|
| Bear Creek near Marcelline |
349 |
81 |
N/A |
157 |
33 |
1 |
487 |
|
| Mackinaw River near Congerville |
767 |
81 |
18 |
457 |
204 |
16 |
1,398 |
|
| Salt Creek near Greenview |
1,804 |
84 |
152 |
1,096 |
624 |
106 |
2,837 |
|
| Sangamon River at Monticello |
550 |
116 |
4 |
368 |
165 |
12 |
1,118 |
|
| So. Fork Sangamon near Rochester |
867 |
76 |
10 |
560 |
143 |
7 |
1,694 |
|
| Illinois River at Valley City |
26,743 |
86 |
5,455 |
18,530 |
15,400 |
6,778 |
37,150 |
|
| Macoupin Creek near Kane |
868 |
97 |
18 |
501 |
151 |
8 |
1,514 |
|
| Vermilion River near Danville |
1,290 |
104 |
N/A |
970 |
560 |
62 |
2,625 |
|
| Kaskaskia River at Vandalia |
1,940 |
56 |
288 |
1,900 |
1,539 |
159 |
5,294 |
|
| Shoal Creek near Breese |
735 |
84 |
N/A |
606 |
209 |
19 |
1,762 |
|
| Embarras River at Ste. Marie |
1,516 |
114 |
46 |
1,293 |
777 |
39 |
3,501 |
|
| Skillet Fork at Wayne City |
464 |
109 |
8 |
464 |
214 |
5 |
1,264 |
|
| Little Wabash below Clay City |
1,131 |
111 |
47 |
1,085 |
514 |
22 |
2,706 |
|
| Big Muddy at Plumfield |
794 |
55 |
49 |
671 |
363 |
50 |
1,877 |
|
| Cache River at Forman |
244 |
103 |
26 |
357 |
214 |
13 |
931 |
|
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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 |