Provisional Monthly Streamflow Network - Tabular Data: May 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 |
7,178 |
5,998 |
5,325 |
2,397 |
11,460 |
|
| Rock River near Joslin |
9,549 |
85 |
10,833 |
9,529 |
8,411 |
3,875 |
17,910 |
|
| Pecatonica River at Freeport |
1,326 |
110 |
1,666 |
1,107 |
900 |
453 |
2,202 |
|
| Green River near Geneseo |
1,003 |
88 |
999 |
1,107 |
905 |
301 |
2,189 |
|
| Edwards River near New Boston |
445 |
90 |
592 |
578 |
407 |
120 |
1,307 |
|
| Kankakee River at Momence |
2,294 |
109 |
3,816 |
2,980 |
2,819 |
1,468 |
4,749 |
|
| Iroquois River near Chebanse |
2,091 |
101 |
3,498 |
2,816 |
2,229 |
698 |
5,978 |
|
| Fox River at Dayton |
2,642 |
110 |
3,387 |
2,787 |
2,317 |
811 |
5,118 |
|
| Vermilion River at Pontiac |
579 |
82 |
1,049 |
795 |
593 |
191 |
1,740 |
|
| Spoon River at Seville |
1,636 |
110 |
2,030 |
1,973 |
1,383 |
397 |
4,555 |
|
| LaMoine River at Ripley |
1,293 |
103 |
2,490 |
1,572 |
881 |
208 |
3,969 |
|
| Bear Creek near Marcelline |
349 |
80 |
199 |
435 |
213 |
25 |
1,272 |
|
| Mackinaw River near Congerville |
767 |
80 |
1,273 |
993 |
835 |
244 |
2,215 |
|
| Salt Creek near Greenview |
1,804 |
83 |
3,587 |
2,493 |
1,975 |
624 |
5,516 |
|
| Sangamon River at Monticello |
550 |
115 |
732 |
735 |
531 |
185 |
1,637 |
|
| So. Fork Sangamon near Rochester |
867 |
75 |
1,301 |
1,182 |
759 |
158 |
2,919 |
|
| Illinois River at Valley City |
26,743 |
86 |
51,535 |
38,469 |
35,170 |
15,440 |
71,880 |
|
| Macoupin Creek near Kane |
868 |
96 |
3,107 |
1,048 |
526 |
86 |
3,031 |
|
| Vermilion River near Danville |
1,290 |
103 |
2,053 |
1,731 |
1,282 |
571 |
3,903 |
|
| Kaskaskia River at Vandalia |
1,940 |
55 |
1,849 |
2,081 |
1,568 |
273 |
5,323 |
|
| Shoal Creek near Breese |
735 |
83 |
1,437 |
964 |
688 |
105 |
2,076 |
|
| Embarras River at Ste. Marie |
1,516 |
113 |
1,574 |
2,022 |
1,278 |
380 |
5,170 |
|
| Skillet Fork at Wayne City |
464 |
108 |
792 |
666 |
338 |
38 |
2,070 |
|
| Little Wabash below Clay City |
1,131 |
110 |
1,357 |
1,529 |
847 |
91 |
4,973 |
|
| Big Muddy at Plumfield |
794 |
54 |
933 |
1,507 |
993 |
274 |
4,123 |
|
| Cache River at Forman |
244 |
102 |
857 |
452 |
318 |
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 2022. For best results when printing this page, change your layout to "Landscape". Streamflow Data |