Provisional Monthly Streamflow Network - Tabular Data: July 2024
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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 |
13,845 |
4,312 |
3,089 |
1,425 |
9,078 |
|
| Rock River near Joslin |
9,549 |
85 |
19,729 |
6,793 |
5,133 |
2,351 |
14,270 |
|
| Pecatonica River at Freeport |
1,326 |
110 |
2,310 |
995 |
776 |
385 |
1,861 |
|
| Green River near Geneseo |
1,003 |
88 |
717 |
621 |
451 |
175 |
1,345 |
|
| Edwards River near New Boston |
445 |
90 |
176 |
316 |
191 |
47 |
704 |
|
| Kankakee River at Momence |
2,294 |
109 |
3,184 |
1,581 |
1,382 |
733 |
2,782 |
|
| Iroquois River near Chebanse |
2,091 |
101 |
1,338 |
1,386 |
749 |
141 |
3,257 |
|
| Fox River at Dayton |
2,642 |
110 |
3,675 |
1,457 |
1,093 |
395 |
3,522 |
|
| Vermilion River at Pontiac |
579 |
82 |
58 |
339 |
181 |
36 |
770 |
|
| Spoon River at Seville |
1,636 |
110 |
1,689 |
1,049 |
698 |
170 |
2,410 |
|
| LaMoine River at Ripley |
1,293 |
103 |
296 |
817 |
374 |
62 |
2,370 |
|
| Bear Creek near Marcelline |
349 |
80 |
115 |
264 |
77 |
4 |
882 |
|
| Mackinaw River near Congerville |
767 |
80 |
117 |
392 |
233 |
36 |
1,008 |
|
| Salt Creek near Greenview |
1,804 |
83 |
824 |
1,268 |
840 |
276 |
3,049 |
|
| Sangamon River at Monticello |
550 |
115 |
171 |
302 |
163 |
27 |
942 |
|
| So. Fork Sangamon near Rochester |
867 |
75 |
139 |
401 |
227 |
24 |
998 |
|
| Illinois River at Valley City |
26,743 |
86 |
24,400 |
23,534 |
19,910 |
8,846 |
46,690 |
|
| Macoupin Creek near Kane |
868 |
96 |
157 |
362 |
137 |
19 |
1,041 |
|
| Vermilion River near Danville |
1,290 |
103 |
1,167 |
784 |
519 |
76 |
1,933 |
|
| Kaskaskia River at Vandalia |
1,940 |
55 |
1,428 |
1,378 |
1,271 |
276 |
2,901 |
|
| Shoal Creek near Breese |
735 |
83 |
549 |
342 |
163 |
32 |
868 |
|
| Embarras River at Ste. Marie |
1,516 |
113 |
1,366 |
814 |
547 |
107 |
1,934 |
|
| Skillet Fork at Wayne City |
464 |
108 |
964 |
193 |
73 |
4 |
678 |
|
| Little Wabash below Clay City |
1,131 |
110 |
1,716 |
567 |
278 |
27 |
1,864 |
|
| Big Muddy at Plumfield |
794 |
54 |
560 |
514 |
449 |
86 |
1,063 |
|
| Cache River at Forman |
244 |
102 |
56 |
111 |
42 |
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 2022. For best results when printing this page, change your layout to "Landscape". Streamflow Data |