Provisional Monthly Streamflow Network - Tabular Data: December 2022
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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 |
4,532 |
3,689 |
3,230 |
1,288 |
6,242 |
|
Rock River near Joslin |
9,549 |
84 |
7,207 |
5,683 |
5,107 |
1,984 |
10,200 |
|
Pecatonica River at Freeport |
1,326 |
109 |
1,241 |
754 |
635 |
303 |
1,435 |
|
Green River near Geneseo |
1,003 |
88 |
666 |
532 |
412 |
87 |
1,373 |
|
Edwards River near New Boston |
445 |
88 |
N/A |
207 |
121 |
16 |
504 |
|
Kankakee River at Momence |
2,294 |
111 |
1,190 |
2,082 |
1,872 |
833 |
3,787 |
|
Iroquois River near Chebanse |
2,091 |
100 |
1,214 |
1,629 |
1,090 |
132 |
4,236 |
|
Fox River at Dayton |
2,642 |
109 |
1,639 |
1,649 |
1,351 |
492 |
3,459 |
|
Vermilion River at Pontiac |
579 |
81 |
133 |
394 |
170 |
8 |
1,070 |
|
Spoon River at Seville |
1,636 |
109 |
203 |
746 |
401 |
65 |
1,905 |
|
LaMoine River at Ripley |
1,293 |
103 |
175 |
550 |
238 |
28 |
1,472 |
|
Bear Creek near Marcelline |
349 |
80 |
71 |
162 |
33 |
1 |
556 |
|
Mackinaw River near Congerville |
767 |
79 |
122 |
467 |
226 |
15 |
1,493 |
|
Salt Creek near Greenview |
1,804 |
82 |
693 |
1,114 |
591 |
106 |
2,837 |
|
Sangamon River at Monticello |
550 |
114 |
124 |
374 |
180 |
12 |
1,118 |
|
So. Fork Sangamon near Rochester |
867 |
74 |
435 |
575 |
147 |
8 |
1,694 |
|
Illinois River at Valley City |
26,743 |
85 |
11,487 |
18,688 |
15,810 |
6,778 |
37,150 |
|
Macoupin Creek near Kane |
868 |
96 |
298 |
512 |
155 |
8 |
1,514 |
|
Vermilion River near Danville |
1,290 |
102 |
501 |
981 |
564 |
62 |
2,625 |
|
Kaskaskia River at Vandalia |
1,940 |
54 |
229 |
1,992 |
1,624 |
282 |
5,780 |
|
Shoal Creek near Breese |
735 |
81 |
377 |
617 |
196 |
19 |
1,762 |
|
Embarras River at Ste. Marie |
1,516 |
112 |
148 |
1,324 |
833 |
39 |
3,501 |
|
Skillet Fork at Wayne City |
464 |
106 |
91 |
470 |
227 |
5 |
1,264 |
|
Little Wabash below Clay City |
1,131 |
109 |
243 |
1,107 |
533 |
22 |
3,525 |
|
Big Muddy at Plumfield |
794 |
53 |
81 |
699 |
368 |
52 |
1,877 |
|
Cache River at Forman |
244 |
101 |
66 |
362 |
215 |
16 |
931 |
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 |