Provisional Monthly Streamflow Network - Tabular Data: August 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 |
6,816 |
3,323 |
2,914 |
1,280 |
5,564 |
|
Rock River near Joslin |
9,549 |
85 |
10,140 |
5,044 |
4,217 |
2,057 |
9,290 |
|
Pecatonica River at Freeport |
1,326 |
110 |
1,336 |
806 |
672 |
332 |
1,695 |
|
Green River near Geneseo |
1,003 |
88 |
312 |
397 |
259 |
99 |
1,073 |
|
Edwards River near New Boston |
445 |
90 |
75 |
156 |
84 |
20 |
422 |
|
Kankakee River at Momence |
2,294 |
109 |
1,259 |
1,150 |
942 |
617 |
1,940 |
|
Iroquois River near Chebanse |
2,091 |
101 |
213 |
501 |
240 |
64 |
1,325 |
|
Fox River at Dayton |
2,642 |
110 |
1,454 |
1,061 |
734 |
303 |
2,080 |
|
Vermilion River at Pontiac |
579 |
82 |
17 |
128 |
34 |
8 |
348 |
|
Spoon River at Seville |
1,636 |
110 |
558 |
495 |
304 |
80 |
965 |
|
LaMoine River at Ripley |
1,293 |
103 |
343 |
338 |
189 |
35 |
971 |
|
Bear Creek near Marcelline |
349 |
80 |
114 |
94 |
51 |
1 |
294 |
|
Mackinaw River near Congerville |
767 |
80 |
46 |
162 |
62 |
13 |
398 |
|
Salt Creek near Greenview |
1,804 |
83 |
732 |
616 |
363 |
163 |
1,226 |
|
Sangamon River at Monticello |
550 |
115 |
52 |
144 |
49 |
12 |
463 |
|
So. Fork Sangamon near Rochester |
867 |
75 |
156 |
212 |
68 |
6 |
512 |
|
Illinois River at Valley City |
26,743 |
86 |
11,454 |
13,691 |
11,930 |
7,619 |
22,380 |
|
Macoupin Creek near Kane |
868 |
96 |
46 |
206 |
76 |
14 |
535 |
|
Vermilion River near Danville |
1,290 |
103 |
304 |
390 |
174 |
51 |
1,001 |
|
Kaskaskia River at Vandalia |
1,940 |
55 |
690 |
955 |
894 |
103 |
2,168 |
|
Shoal Creek near Breese |
735 |
83 |
152 |
217 |
77 |
17 |
664 |
|
Embarras River at Ste. Marie |
1,516 |
113 |
180 |
418 |
188 |
61 |
924 |
|
Skillet Fork at Wayne City |
464 |
108 |
456 |
148 |
25 |
1 |
483 |
|
Little Wabash below Clay City |
1,131 |
110 |
349 |
398 |
117 |
16 |
1,218 |
|
Big Muddy at Plumfield |
794 |
54 |
487 |
303 |
226 |
56 |
660 |
|
Cache River at Forman |
244 |
102 |
17 |
71 |
24 |
4 |
196 |
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 |