Provisional Monthly Streamflow Network - Tabular Data: March 2025
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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 |
5,311 |
7,574 |
7,073 |
2,949 |
12,630 |
|
| Rock River near Joslin |
9,549 |
85 |
6,957 |
11,416 |
10,430 |
4,826 |
18,310 |
|
| Pecatonica River at Freeport |
1,326 |
110 |
987 |
1,791 |
1,604 |
692 |
3,180 |
|
| Green River near Geneseo |
1,003 |
89 |
551 |
1,103 |
963 |
398 |
2,266 |
|
| Edwards River near New Boston |
445 |
90 |
135 |
529 |
413 |
146 |
1,062 |
|
| Kankakee River at Momence |
2,294 |
112 |
3,145 |
3,372 |
3,277 |
1,681 |
5,157 |
|
| Iroquois River near Chebanse |
2,091 |
101 |
2,119 |
3,171 |
2,782 |
859 |
6,270 |
|
| Fox River at Dayton |
2,642 |
110 |
2,517 |
3,422 |
3,135 |
1,380 |
5,915 |
|
| Vermilion River at Pontiac |
579 |
82 |
355 |
754 |
672 |
139 |
1,567 |
|
| Spoon River at Seville |
1,636 |
110 |
709 |
1,739 |
1,339 |
555 |
3,975 |
|
| LaMoine River at Ripley |
1,293 |
103 |
178 |
1,325 |
945 |
281 |
3,486 |
|
| Bear Creek near Marcelline |
349 |
81 |
40 |
373 |
247 |
42 |
1,002 |
|
| Mackinaw River near Congerville |
767 |
80 |
188 |
949 |
767 |
157 |
2,391 |
|
| Salt Creek near Greenview |
1,804 |
83 |
642 |
2,111 |
1,754 |
470 |
4,212 |
|
| Sangamon River at Monticello |
550 |
115 |
241 |
713 |
613 |
150 |
1,370 |
|
| So. Fork Sangamon near Rochester |
867 |
75 |
168 |
1,007 |
724 |
137 |
2,059 |
|
| Illinois River at Valley City |
26,743 |
86 |
20,333 |
35,042 |
31,370 |
13,470 |
55,520 |
|
| Macoupin Creek near Kane |
868 |
96 |
193 |
893 |
606 |
116 |
2,254 |
|
| Vermilion River near Danville |
1,290 |
103 |
824 |
1,755 |
1,500 |
507 |
3,125 |
|
| Kaskaskia River at Vandalia |
1,940 |
55 |
662 |
2,997 |
2,627 |
594 |
6,037 |
|
| Shoal Creek near Breese |
735 |
82 |
373 |
991 |
841 |
182 |
2,218 |
|
| Embarras River at Ste. Marie |
1,516 |
113 |
695 |
2,233 |
2,075 |
523 |
4,495 |
|
| Skillet Fork at Wayne City |
464 |
107 |
402 |
849 |
743 |
126 |
1,870 |
|
| Little Wabash below Clay City |
1,131 |
110 |
749 |
1,807 |
1,547 |
307 |
3,494 |
|
| Big Muddy at Plumfield |
794 |
54 |
835 |
1,417 |
1,186 |
367 |
2,616 |
|
| Cache River at Forman |
244 |
102 |
159 |
637 |
462 |
207 |
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 2023. For best results when printing this page, change your layout to "Landscape". Streamflow Data |