Provisional Monthly Streamflow Network - Tabular Data: June 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 |
4,900 |
5,304 |
4,366 |
1,734 |
10,190 |
|
| Rock River near Joslin |
9,549 |
85 |
6,486 |
8,675 |
7,161 |
3,128 |
17,450 |
|
| Pecatonica River at Freeport |
1,326 |
110 |
898 |
1,155 |
955 |
388 |
2,218 |
|
| Green River near Geneseo |
1,003 |
89 |
428 |
1,022 |
871 |
239 |
2,431 |
|
| Edwards River near New Boston |
445 |
90 |
281 |
506 |
389 |
68 |
1,241 |
|
| Kankakee River at Momence |
2,294 |
112 |
1,862 |
2,323 |
2,077 |
1,002 |
3,931 |
|
| Iroquois River near Chebanse |
2,091 |
102 |
2,033 |
2,284 |
1,724 |
417 |
5,013 |
|
| Fox River at Dayton |
2,642 |
110 |
1,384 |
2,216 |
1,794 |
675 |
5,221 |
|
| Vermilion River at Pontiac |
579 |
82 |
847 |
612 |
406 |
96 |
1,612 |
|
| Spoon River at Seville |
1,636 |
110 |
859 |
1,752 |
1,153 |
284 |
3,898 |
|
| LaMoine River at Ripley |
1,293 |
104 |
541 |
1,316 |
779 |
99 |
3,090 |
|
| Bear Creek near Marcelline |
349 |
81 |
160 |
351 |
132 |
7 |
1,130 |
|
| Mackinaw River near Congerville |
767 |
80 |
698 |
806 |
594 |
117 |
1,961 |
|
| Salt Creek near Greenview |
1,804 |
83 |
1,544 |
1,993 |
1,410 |
486 |
3,964 |
|
| Sangamon River at Monticello |
550 |
115 |
373 |
553 |
404 |
83 |
1,241 |
|
| So. Fork Sangamon near Rochester |
867 |
75 |
403 |
957 |
569 |
107 |
2,539 |
|
| Illinois River at Valley City |
26,743 |
86 |
20,257 |
32,291 |
28,390 |
10,480 |
66,270 |
|
| Macoupin Creek near Kane |
868 |
97 |
374 |
629 |
340 |
58 |
1,730 |
|
| Vermilion River near Danville |
1,290 |
103 |
1,086 |
1,358 |
1,050 |
229 |
2,956 |
|
| Kaskaskia River at Vandalia |
1,940 |
55 |
739 |
1,826 |
1,673 |
327 |
4,658 |
|
| Shoal Creek near Breese |
735 |
82 |
249 |
591 |
327 |
59 |
1,469 |
|
| Embarras River at Ste. Marie |
1,516 |
113 |
727 |
1,461 |
997 |
215 |
3,509 |
|
| Skillet Fork at Wayne City |
464 |
107 |
487 |
352 |
148 |
11 |
1,117 |
|
| Little Wabash below Clay City |
1,131 |
110 |
726 |
959 |
475 |
70 |
2,578 |
|
| Big Muddy at Plumfield |
794 |
54 |
1,164 |
818 |
652 |
169 |
1,809 |
|
| Cache River at Forman |
244 |
102 |
959 |
216 |
154 |
9 |
461 |
|
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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 |