Provisional Monthly Streamflow Network - Tabular Data: October 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 |
85 |
2,959 |
3,629 |
2,973 |
1,093 |
6,262 |
|
| Rock River near Joslin |
9,549 |
85 |
4,492 |
5,186 |
4,212 |
1,665 |
8,879 |
|
| Pecatonica River at Freeport |
1,326 |
110 |
771 |
809 |
658 |
313 |
1,480 |
|
| Green River near Geneseo |
1,003 |
88 |
426 |
406 |
218 |
67 |
978 |
|
| Edwards River near New Boston |
445 |
90 |
47 |
150 |
50 |
13 |
519 |
|
| Kankakee River at Momence |
2,294 |
109 |
1,305 |
1,287 |
922 |
596 |
2,825 |
|
| Iroquois River near Chebanse |
2,091 |
101 |
316 |
758 |
232 |
63 |
2,035 |
|
| Fox River at Dayton |
2,642 |
110 |
1,354 |
1,263 |
898 |
321 |
2,774 |
|
| Vermilion River at Pontiac |
579 |
82 |
58 |
173 |
27 |
3 |
637 |
|
| Spoon River at Seville |
1,636 |
110 |
113 |
541 |
181 |
57 |
1,503 |
|
| LaMoine River at Ripley |
1,293 |
103 |
25 |
441 |
114 |
23 |
1,584 |
|
| Bear Creek near Marcelline |
349 |
80 |
2 |
126 |
13 |
1 |
516 |
|
| Mackinaw River near Congerville |
767 |
80 |
130 |
215 |
30 |
7 |
915 |
|
| Salt Creek near Greenview |
1,804 |
83 |
410 |
550 |
221 |
111 |
1,698 |
|
| Sangamon River at Monticello |
550 |
115 |
19 |
177 |
36 |
7 |
600 |
|
| So. Fork Sangamon near Rochester |
867 |
75 |
13 |
204 |
26 |
2 |
623 |
|
| Illinois River at Valley City |
26,743 |
86 |
9,923 |
13,213 |
8,053 |
5,617 |
30,100 |
|
| Macoupin Creek near Kane |
868 |
96 |
15 |
249 |
43 |
6 |
663 |
|
| Vermilion River near Danville |
1,290 |
103 |
111 |
384 |
109 |
44 |
1,133 |
|
| Kaskaskia River at Vandalia |
1,940 |
55 |
53 |
570 |
196 |
62 |
2,248 |
|
| Shoal Creek near Breese |
735 |
83 |
34 |
188 |
48 |
10 |
716 |
|
| Embarras River at Ste. Marie |
1,516 |
113 |
35 |
434 |
127 |
30 |
1,227 |
|
| Skillet Fork at Wayne City |
464 |
108 |
7 |
107 |
12 |
0 |
379 |
|
| Little Wabash below Clay City |
1,131 |
110 |
10 |
238 |
52 |
7 |
971 |
|
| Big Muddy at Plumfield |
794 |
54 |
54 |
155 |
77 |
34 |
464 |
|
| Cache River at Forman |
244 |
102 |
26 |
61 |
16 |
1 |
195 |
|
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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 |