Provisional Monthly Streamflow Network - Tabular Data: May 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 |
7,055 |
5,984 |
5,306 |
2,397 |
11,460 |
|
| Rock River near Joslin |
9,549 |
84 |
10,092 |
9,523 |
8,369 |
3,875 |
17,910 |
|
| Pecatonica River at Freeport |
1,326 |
109 |
1,341 |
1,105 |
897 |
453 |
2,202 |
|
| Green River near Geneseo |
1,003 |
88 |
1,170 |
1,107 |
904 |
301 |
2,189 |
|
| Edwards River near New Boston |
445 |
88 |
307 |
581 |
407 |
120 |
1,307 |
|
| Kankakee River at Momence |
2,294 |
111 |
1,968 |
2,989 |
2,851 |
1,468 |
4,749 |
|
| Iroquois River near Chebanse |
2,091 |
100 |
1,133 |
2,833 |
2,292 |
698 |
5,978 |
|
| Fox River at Dayton |
2,642 |
109 |
1,889 |
2,797 |
2,364 |
811 |
5,118 |
|
| Vermilion River at Pontiac |
579 |
81 |
299 |
802 |
597 |
191 |
1,740 |
|
| Spoon River at Seville |
1,636 |
109 |
916 |
1,983 |
1,386 |
397 |
4,555 |
|
| LaMoine River at Ripley |
1,293 |
103 |
626 |
1,581 |
885 |
208 |
3,969 |
|
| Bear Creek near Marcelline |
349 |
80 |
95 |
439 |
226 |
24 |
1,321 |
|
| Mackinaw River near Congerville |
767 |
79 |
510 |
999 |
835 |
244 |
2,215 |
|
| Salt Creek near Greenview |
1,804 |
82 |
1,514 |
2,505 |
2,008 |
624 |
5,516 |
|
| Sangamon River at Monticello |
550 |
114 |
314 |
738 |
545 |
185 |
1,637 |
|
| So. Fork Sangamon near Rochester |
867 |
74 |
1,565 |
1,176 |
733 |
158 |
2,919 |
|
| Illinois River at Valley City |
26,743 |
85 |
21,157 |
38,645 |
35,320 |
15,440 |
71,880 |
|
| Macoupin Creek near Kane |
868 |
96 |
659 |
1,052 |
520 |
86 |
3,031 |
|
| Vermilion River near Danville |
1,290 |
102 |
700 |
1,742 |
1,284 |
571 |
3,903 |
|
| Kaskaskia River at Vandalia |
1,940 |
54 |
1,055 |
2,100 |
1,585 |
273 |
5,323 |
|
| Shoal Creek near Breese |
735 |
81 |
691 |
967 |
679 |
105 |
2,076 |
|
| Embarras River at Ste. Marie |
1,516 |
112 |
991 |
2,031 |
1,284 |
380 |
5,170 |
|
| Skillet Fork at Wayne City |
464 |
106 |
275 |
670 |
339 |
38 |
2,070 |
|
| Little Wabash below Clay City |
1,131 |
109 |
1,034 |
1,533 |
831 |
91 |
4,973 |
|
| Big Muddy at Plumfield |
794 |
53 |
993 |
1,517 |
1,009 |
274 |
4,123 |
|
| Cache River at Forman |
244 |
101 |
98 |
455 |
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 2021. For best results when printing this page, change your layout to "Landscape". Streamflow Data |