Provisional Monthly Streamflow Network - Tabular Data: April 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 |
5,973 |
7,850 |
6,909 |
3,161 |
12,840 |
|
| Rock River near Joslin |
9,549 |
85 |
8,084 |
11,485 |
10,310 |
4,700 |
18,870 |
|
| Pecatonica River at Freeport |
1,326 |
110 |
1,001 |
1,322 |
1,110 |
514 |
2,210 |
|
| Green River near Geneseo |
1,003 |
89 |
602 |
1,099 |
1,008 |
379 |
2,347 |
|
| Edwards River near New Boston |
445 |
89 |
194 |
571 |
458 |
149 |
1,297 |
|
| Kankakee River at Momence |
2,294 |
112 |
3,531 |
3,488 |
3,489 |
1,807 |
5,393 |
|
| Iroquois River near Chebanse |
2,091 |
101 |
3,329 |
3,155 |
2,926 |
955 |
5,945 |
|
| Fox River at Dayton |
2,642 |
110 |
2,610 |
3,421 |
3,138 |
1,207 |
5,845 |
|
| Vermilion River at Pontiac |
579 |
82 |
499 |
800 |
673 |
191 |
1,644 |
|
| Spoon River at Seville |
1,636 |
110 |
885 |
1,932 |
1,536 |
448 |
3,851 |
|
| LaMoine River at Ripley |
1,293 |
104 |
363 |
1,581 |
1,291 |
234 |
3,284 |
|
| Bear Creek near Marcelline |
349 |
81 |
187 |
424 |
310 |
42 |
970 |
|
| Mackinaw River near Congerville |
767 |
80 |
355 |
1,062 |
924 |
233 |
1,984 |
|
| Salt Creek near Greenview |
1,804 |
83 |
1,632 |
2,393 |
2,020 |
793 |
4,521 |
|
| Sangamon River at Monticello |
550 |
115 |
679 |
791 |
669 |
194 |
1,648 |
|
| So. Fork Sangamon near Rochester |
867 |
75 |
1,091 |
1,090 |
852 |
153 |
2,243 |
|
| Illinois River at Valley City |
26,743 |
86 |
29,183 |
37,733 |
34,690 |
15,840 |
61,280 |
|
| Macoupin Creek near Kane |
868 |
97 |
1,883 |
1,134 |
715 |
129 |
2,864 |
|
| Vermilion River near Danville |
1,290 |
103 |
2,106 |
1,899 |
1,618 |
537 |
3,786 |
|
| Kaskaskia River at Vandalia |
1,940 |
55 |
4,335 |
2,661 |
2,133 |
515 |
5,594 |
|
| Shoal Creek near Breese |
735 |
82 |
2,817 |
1,052 |
719 |
174 |
2,236 |
|
| Embarras River at Ste. Marie |
1,516 |
113 |
4,908 |
2,304 |
1,812 |
543 |
4,787 |
|
| Skillet Fork at Wayne City |
464 |
107 |
3,616 |
824 |
726 |
117 |
1,910 |
|
| Little Wabash below Clay City |
1,131 |
110 |
7,518 |
1,746 |
1,303 |
235 |
3,830 |
|
| Big Muddy at Plumfield |
794 |
54 |
4,963 |
1,520 |
1,294 |
431 |
3,113 |
|
| Cache River at Forman |
244 |
102 |
2,426 |
588 |
523 |
112 |
1,190 |
|
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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 |