Provisional Monthly Streamflow Network - Tabular Data: March 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 |
11,510 |
7,554 |
7,073 |
2,949 |
12,630 |
|
| Rock River near Joslin |
9,549 |
84 |
15,881 |
11,398 |
10,430 |
4,826 |
18,310 |
|
| Pecatonica River at Freeport |
1,326 |
109 |
2,444 |
1,793 |
1,604 |
671 |
3,209 |
|
| Green River near Geneseo |
1,003 |
88 |
1,223 |
1,102 |
919 |
398 |
2,266 |
|
| Edwards River near New Boston |
445 |
88 |
568 |
530 |
413 |
138 |
1,069 |
|
| Kankakee River at Momence |
2,294 |
111 |
4,252 |
3,365 |
3,277 |
1,681 |
5,157 |
|
| Iroquois River near Chebanse |
2,091 |
100 |
6,285 |
3,155 |
2,782 |
829 |
6,301 |
|
| Fox River at Dayton |
2,642 |
109 |
4,696 |
3,409 |
3,110 |
1,326 |
5,967 |
|
| Vermilion River at Pontiac |
579 |
81 |
1,243 |
753 |
672 |
139 |
1,567 |
|
| Spoon River at Seville |
1,636 |
109 |
1,712 |
1,740 |
1,312 |
449 |
4,009 |
|
| LaMoine River at Ripley |
1,293 |
103 |
1,202 |
1,335 |
945 |
281 |
3,486 |
|
| Bear Creek near Marcelline |
349 |
80 |
225 |
379 |
250 |
42 |
1,028 |
|
| Mackinaw River near Congerville |
767 |
79 |
1,447 |
949 |
767 |
138 |
2,440 |
|
| Salt Creek near Greenview |
1,804 |
82 |
2,997 |
2,114 |
1,754 |
470 |
4,212 |
|
| Sangamon River at Monticello |
550 |
114 |
1,057 |
712 |
613 |
150 |
1,370 |
|
| So. Fork Sangamon near Rochester |
867 |
74 |
1,545 |
1,008 |
724 |
137 |
2,059 |
|
| Illinois River at Valley City |
26,743 |
85 |
48,547 |
34,950 |
31,370 |
13,470 |
55,520 |
|
| Macoupin Creek near Kane |
868 |
96 |
1,142 |
896 |
606 |
116 |
2,254 |
|
| Vermilion River near Danville |
1,290 |
102 |
2,998 |
1,752 |
1,500 |
507 |
3,125 |
|
| Kaskaskia River at Vandalia |
1,940 |
54 |
3,864 |
3,011 |
2,627 |
671 |
6,185 |
|
| Shoal Creek near Breese |
735 |
81 |
2,226 |
985 |
841 |
182 |
2,202 |
|
| Embarras River at Ste. Marie |
1,516 |
112 |
3,968 |
2,231 |
2,075 |
523 |
4,495 |
|
| Skillet Fork at Wayne City |
464 |
106 |
1,944 |
845 |
743 |
126 |
1,830 |
|
| Little Wabash below Clay City |
1,131 |
109 |
4,164 |
1,799 |
1,547 |
295 |
3,494 |
|
| Big Muddy at Plumfield |
794 |
53 |
2,680 |
1,417 |
1,186 |
367 |
2,391 |
|
| Cache River at Forman |
244 |
101 |
1,226 |
636 |
462 |
225 |
1,319 |
|
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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 |