Provisional Monthly Streamflow Network - Tabular Data: July 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 |
4,713 |
4,424 |
3,120 |
1,425 |
9,651 |
|
| Rock River near Joslin |
9,549 |
85 |
7,094 |
6,935 |
5,176 |
2,351 |
14,730 |
|
| Pecatonica River at Freeport |
1,326 |
110 |
1,204 |
1,007 |
781 |
387 |
1,861 |
|
| Green River near Geneseo |
1,003 |
89 |
363 |
622 |
456 |
175 |
1,345 |
|
| Edwards River near New Boston |
445 |
90 |
327 |
314 |
191 |
48 |
699 |
|
| Kankakee River at Momence |
2,294 |
111 |
1,215 |
1,595 |
1,387 |
733 |
2,836 |
|
| Iroquois River near Chebanse |
2,091 |
102 |
582 |
1,386 |
758 |
141 |
3,257 |
|
| Fox River at Dayton |
2,642 |
110 |
1,427 |
1,477 |
1,094 |
404 |
3,522 |
|
| Vermilion River at Pontiac |
579 |
82 |
121 |
336 |
178 |
36 |
770 |
|
| Spoon River at Seville |
1,636 |
111 |
1,056 |
1,055 |
715 |
184 |
2,320 |
|
| LaMoine River at Ripley |
1,293 |
104 |
967 |
812 |
358 |
62 |
2,370 |
|
| Bear Creek near Marcelline |
349 |
81 |
172 |
262 |
80 |
4 |
882 |
|
| Mackinaw River near Congerville |
767 |
80 |
131 |
389 |
229 |
43 |
1,006 |
|
| Salt Creek near Greenview |
1,804 |
83 |
711 |
1,261 |
834 |
276 |
3,049 |
|
| Sangamon River at Monticello |
550 |
116 |
51 |
301 |
165 |
27 |
942 |
|
| So. Fork Sangamon near Rochester |
867 |
76 |
323 |
398 |
217 |
24 |
998 |
|
| Illinois River at Valley City |
26,743 |
86 |
14,876 |
23,543 |
19,930 |
8,846 |
46,690 |
|
| Macoupin Creek near Kane |
868 |
97 |
1,491 |
360 |
140 |
19 |
1,041 |
|
| Vermilion River near Danville |
1,290 |
104 |
231 |
787 |
523 |
76 |
1,933 |
|
| Kaskaskia River at Vandalia |
1,940 |
55 |
1,966 |
1,379 |
1,277 |
276 |
2,901 |
|
| Shoal Creek near Breese |
735 |
83 |
732 |
344 |
164 |
32 |
868 |
|
| Embarras River at Ste. Marie |
1,516 |
113 |
1,003 |
818 |
550 |
107 |
1,934 |
|
| Skillet Fork at Wayne City |
464 |
108 |
846 |
200 |
74 |
4 |
679 |
|
| Little Wabash below Clay City |
1,131 |
111 |
2,419 |
577 |
279 |
30 |
1,727 |
|
| Big Muddy at Plumfield |
794 |
54 |
616 |
515 |
457 |
86 |
1,063 |
|
| Cache River at Forman |
244 |
101 |
123 |
111 |
43 |
6 |
287 |
|
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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 2023. For best results when printing this page, change your layout to "Landscape". Streamflow Data |