Provisional Monthly Streamflow Network - Tabular Data: July 2023
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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 |
84 |
3,065 |
4,330 |
3,120 |
1,425 |
9,078 |
|
| Rock River near Joslin |
9,549 |
84 |
4,142 |
6,825 |
5,176 |
2,351 |
14,270 |
|
| Pecatonica River at Freeport |
1,326 |
109 |
813 |
996 |
763 |
385 |
1,861 |
|
| Green River near Geneseo |
1,003 |
88 |
478 |
623 |
447 |
175 |
1,345 |
|
| Edwards River near New Boston |
445 |
88 |
68 |
319 |
191 |
47 |
704 |
|
| Kankakee River at Momence |
2,294 |
111 |
991 |
1,586 |
1,387 |
730 |
2,836 |
|
| Iroquois River near Chebanse |
2,091 |
100 |
358 |
1,397 |
758 |
141 |
3,257 |
|
| Fox River at Dayton |
2,642 |
109 |
1,320 |
1,457 |
1,090 |
395 |
3,522 |
|
| Vermilion River at Pontiac |
579 |
81 |
101 |
342 |
181 |
36 |
770 |
|
| Spoon River at Seville |
1,636 |
109 |
613 |
1,054 |
715 |
170 |
2,410 |
|
| LaMoine River at Ripley |
1,293 |
103 |
241 |
822 |
377 |
62 |
2,370 |
|
| Bear Creek near Marcelline |
349 |
80 |
39 |
266 |
80 |
4 |
965 |
|
| Mackinaw River near Congerville |
767 |
79 |
232 |
394 |
233 |
36 |
1,008 |
|
| Salt Creek near Greenview |
1,804 |
82 |
337 |
1,280 |
845 |
276 |
3,049 |
|
| Sangamon River at Monticello |
550 |
114 |
65 |
304 |
165 |
27 |
942 |
|
| So. Fork Sangamon near Rochester |
867 |
74 |
166 |
398 |
227 |
24 |
998 |
|
| Illinois River at Valley City |
26,743 |
85 |
13,209 |
23,657 |
19,930 |
8,846 |
46,690 |
|
| Macoupin Creek near Kane |
868 |
96 |
80 |
365 |
140 |
19 |
1,041 |
|
| Vermilion River near Danville |
1,290 |
102 |
185 |
790 |
523 |
76 |
1,933 |
|
| Kaskaskia River at Vandalia |
1,940 |
54 |
391 |
1,397 |
1,277 |
276 |
2,901 |
|
| Shoal Creek near Breese |
735 |
81 |
162 |
344 |
159 |
32 |
868 |
|
| Embarras River at Ste. Marie |
1,516 |
112 |
702 |
815 |
543 |
107 |
1,934 |
|
| Skillet Fork at Wayne City |
464 |
106 |
42 |
195 |
74 |
4 |
678 |
|
| Little Wabash below Clay City |
1,131 |
109 |
209 |
570 |
279 |
27 |
1,864 |
|
| Big Muddy at Plumfield |
794 |
53 |
591 |
513 |
424 |
86 |
1,063 |
|
| Cache River at Forman |
244 |
101 |
170 |
111 |
40 |
5 |
384 |
|
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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 2021. For best results when printing this page, change your layout to "Landscape". Streamflow Data |