Provisional Monthly Streamflow Network - Tabular Data: May 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 |
4,756 |
6,012 |
5,343 |
2,397 |
11,460 |
|
| Rock River near Joslin |
9,549 |
85 |
6,164 |
9,544 |
8,452 |
3,875 |
17,910 |
|
| Pecatonica River at Freeport |
1,326 |
110 |
831 |
1,112 |
926 |
465 |
1,977 |
|
| Green River near Geneseo |
1,003 |
89 |
480 |
1,106 |
905 |
301 |
2,189 |
|
| Edwards River near New Boston |
445 |
90 |
310 |
577 |
407 |
120 |
1,259 |
|
| Kankakee River at Momence |
2,294 |
112 |
1,880 |
2,987 |
2,851 |
1,468 |
4,749 |
|
| Iroquois River near Chebanse |
2,091 |
102 |
1,397 |
2,823 |
2,292 |
698 |
5,978 |
|
| Fox River at Dayton |
2,642 |
110 |
1,561 |
2,793 |
2,364 |
951 |
5,097 |
|
| Vermilion River at Pontiac |
579 |
82 |
294 |
798 |
597 |
191 |
1,740 |
|
| Spoon River at Seville |
1,636 |
110 |
802 |
1,974 |
1,386 |
424 |
4,334 |
|
| LaMoine River at Ripley |
1,293 |
104 |
600 |
1,580 |
885 |
208 |
3,969 |
|
| Bear Creek near Marcelline |
349 |
81 |
287 |
432 |
216 |
25 |
1,272 |
|
| Mackinaw River near Congerville |
767 |
80 |
261 |
997 |
835 |
248 |
2,142 |
|
| Salt Creek near Greenview |
1,804 |
83 |
1,313 |
2,497 |
2,008 |
624 |
5,516 |
|
| Sangamon River at Monticello |
550 |
115 |
327 |
735 |
545 |
185 |
1,637 |
|
| So. Fork Sangamon near Rochester |
867 |
75 |
654 |
1,183 |
784 |
158 |
2,919 |
|
| Illinois River at Valley City |
26,743 |
86 |
16,970 |
38,613 |
35,320 |
15,440 |
71,880 |
|
| Macoupin Creek near Kane |
868 |
97 |
1,170 |
1,069 |
531 |
86 |
3,138 |
|
| Vermilion River near Danville |
1,290 |
103 |
963 |
1,735 |
1,284 |
571 |
3,903 |
|
| Kaskaskia River at Vandalia |
1,940 |
55 |
1,880 |
2,076 |
1,585 |
273 |
5,323 |
|
| Shoal Creek near Breese |
735 |
82 |
774 |
970 |
691 |
105 |
2,076 |
|
| Embarras River at Ste. Marie |
1,516 |
113 |
1,810 |
2,018 |
1,284 |
380 |
5,170 |
|
| Skillet Fork at Wayne City |
464 |
107 |
931 |
668 |
339 |
38 |
2,070 |
|
| Little Wabash below Clay City |
1,131 |
110 |
1,660 |
1,527 |
859 |
91 |
4,670 |
|
| Big Muddy at Plumfield |
794 |
54 |
1,625 |
1,497 |
984 |
274 |
4,123 |
|
| Cache River at Forman |
244 |
102 |
328 |
456 |
328 |
27 |
1,124 |
|
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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 |