Provisional Monthly Streamflow Network - Tabular Data: June 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 |
3,427 |
5,252 |
4,366 |
1,734 |
10,010 |
|
| Rock River near Joslin |
9,549 |
84 |
4,961 |
8,652 |
7,161 |
3,128 |
17,450 |
|
| Pecatonica River at Freeport |
1,326 |
109 |
906 |
1,149 |
955 |
357 |
2,227 |
|
| Green River near Geneseo |
1,003 |
88 |
558 |
1,033 |
893 |
239 |
2,431 |
|
| Edwards River near New Boston |
445 |
88 |
94 |
513 |
405 |
65 |
1,254 |
|
| Kankakee River at Momence |
2,294 |
111 |
949 |
2,339 |
2,088 |
1,016 |
3,931 |
|
| Iroquois River near Chebanse |
2,091 |
100 |
329 |
2,318 |
1,775 |
473 |
5,013 |
|
| Fox River at Dayton |
2,642 |
109 |
698 |
2,224 |
1,794 |
604 |
5,312 |
|
| Vermilion River at Pontiac |
579 |
81 |
85 |
623 |
423 |
103 |
1,612 |
|
| Spoon River at Seville |
1,636 |
109 |
282 |
1,774 |
1,177 |
284 |
3,937 |
|
| LaMoine River at Ripley |
1,293 |
103 |
100 |
1,339 |
796 |
101 |
3,090 |
|
| Bear Creek near Marcelline |
349 |
80 |
3 |
360 |
139 |
7 |
1,159 |
|
| Mackinaw River near Congerville |
767 |
79 |
139 |
818 |
629 |
111 |
2,073 |
|
| Salt Creek near Greenview |
1,804 |
82 |
472 |
2,025 |
1,411 |
523 |
3,964 |
|
| Sangamon River at Monticello |
550 |
114 |
78 |
558 |
429 |
94 |
1,241 |
|
| So. Fork Sangamon near Rochester |
867 |
74 |
97 |
983 |
592 |
108 |
2,539 |
|
| Illinois River at Valley City |
26,743 |
85 |
7,149 |
32,664 |
28,475 |
13,040 |
66,270 |
|
| Macoupin Creek near Kane |
868 |
96 |
60 |
638 |
340 |
58 |
1,730 |
|
| Vermilion River near Danville |
1,290 |
102 |
175 |
1,375 |
1,064 |
252 |
2,956 |
|
| Kaskaskia River at Vandalia |
1,940 |
54 |
255 |
1,871 |
1,694 |
358 |
4,658 |
|
| Shoal Creek near Breese |
735 |
81 |
57 |
603 |
348 |
66 |
1,469 |
|
| Embarras River at Ste. Marie |
1,516 |
112 |
241 |
1,481 |
998 |
215 |
3,509 |
|
| Skillet Fork at Wayne City |
464 |
106 |
4 |
357 |
149 |
11 |
1,117 |
|
| Little Wabash below Clay City |
1,131 |
109 |
102 |
974 |
494 |
55 |
2,706 |
|
| Big Muddy at Plumfield |
794 |
53 |
411 |
828 |
652 |
169 |
1,809 |
|
| Cache River at Forman |
244 |
101 |
7 |
218 |
154 |
10 |
461 |
|
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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 |