Provisional Monthly Streamflow Network - Tabular Data: April 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 |
10,080 |
7,770 |
6,878 |
3,161 |
12,840 |
|
Rock River near Joslin |
9,549 |
84 |
16,023 |
11,364 |
10,300 |
4,700 |
18,870 |
|
Pecatonica River at Freeport |
1,326 |
109 |
1,636 |
1,310 |
1,097 |
512 |
2,361 |
|
Green River near Geneseo |
1,003 |
88 |
1,263 |
1,087 |
960 |
379 |
2,347 |
|
Edwards River near New Boston |
445 |
88 |
530 |
562 |
443 |
149 |
1,230 |
|
Kankakee River at Momence |
2,294 |
111 |
3,431 |
3,470 |
3,489 |
1,807 |
5,265 |
|
Iroquois River near Chebanse |
2,091 |
100 |
2,052 |
3,150 |
2,926 |
936 |
6,043 |
|
Fox River at Dayton |
2,642 |
109 |
4,211 |
3,394 |
3,109 |
1,174 |
5,964 |
|
Vermilion River at Pontiac |
579 |
81 |
424 |
801 |
673 |
191 |
1,644 |
|
Spoon River at Seville |
1,636 |
109 |
1,240 |
1,929 |
1,536 |
395 |
4,055 |
|
LaMoine River at Ripley |
1,293 |
103 |
588 |
1,589 |
1,291 |
234 |
3,284 |
|
Bear Creek near Marcelline |
349 |
80 |
142 |
420 |
310 |
36 |
980 |
|
Mackinaw River near Congerville |
767 |
79 |
657 |
1,064 |
924 |
226 |
2,077 |
|
Salt Creek near Greenview |
1,804 |
82 |
1,519 |
2,405 |
2,020 |
793 |
4,521 |
|
Sangamon River at Monticello |
550 |
114 |
497 |
795 |
679 |
194 |
1,648 |
|
So. Fork Sangamon near Rochester |
867 |
74 |
523 |
1,089 |
852 |
153 |
2,243 |
|
Illinois River at Valley City |
26,743 |
85 |
38,120 |
37,644 |
34,600 |
15,840 |
61,280 |
|
Macoupin Creek near Kane |
868 |
96 |
421 |
1,140 |
715 |
129 |
2,864 |
|
Vermilion River near Danville |
1,290 |
102 |
1,400 |
1,895 |
1,618 |
537 |
3,786 |
|
Kaskaskia River at Vandalia |
1,940 |
54 |
1,860 |
2,663 |
2,133 |
605 |
5,813 |
|
Shoal Creek near Breese |
735 |
81 |
486 |
1,054 |
719 |
174 |
2,236 |
|
Embarras River at Ste. Marie |
1,516 |
112 |
1,378 |
2,307 |
1,812 |
543 |
4,787 |
|
Skillet Fork at Wayne City |
464 |
106 |
484 |
824 |
726 |
117 |
1,910 |
|
Little Wabash below Clay City |
1,131 |
109 |
867 |
1,747 |
1,303 |
195 |
3,840 |
|
Big Muddy at Plumfield |
794 |
53 |
1,876 |
1,531 |
1,294 |
431 |
3,113 |
|
Cache River at Forman |
244 |
101 |
671 |
590 |
523 |
112 |
1,190 |
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 |