Provisional Monthly Streamflow Network - Tabular Data: August 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 |
2,770 |
3,330 |
2,941 |
1,280 |
5,564 |
|
| Rock River near Joslin |
9,549 |
84 |
3,896 |
5,058 |
4,361 |
2,057 |
9,290 |
|
| Pecatonica River at Freeport |
1,326 |
109 |
763 |
807 |
660 |
332 |
1,695 |
|
| Green River near Geneseo |
1,003 |
88 |
196 |
399 |
260 |
99 |
1,073 |
|
| Edwards River near New Boston |
445 |
88 |
85 |
157 |
84 |
20 |
422 |
|
| Kankakee River at Momence |
2,294 |
111 |
1,039 |
1,151 |
931 |
549 |
1,949 |
|
| Iroquois River near Chebanse |
2,091 |
100 |
1,656 |
490 |
238 |
64 |
1,314 |
|
| Fox River at Dayton |
2,642 |
109 |
929 |
1,062 |
730 |
303 |
2,080 |
|
| Vermilion River at Pontiac |
579 |
81 |
276 |
126 |
34 |
8 |
348 |
|
| Spoon River at Seville |
1,636 |
109 |
651 |
493 |
303 |
72 |
1,020 |
|
| LaMoine River at Ripley |
1,293 |
103 |
182 |
340 |
194 |
35 |
971 |
|
| Bear Creek near Marcelline |
349 |
80 |
52 |
95 |
50 |
1 |
294 |
|
| Mackinaw River near Congerville |
767 |
79 |
223 |
161 |
62 |
13 |
398 |
|
| Salt Creek near Greenview |
1,804 |
82 |
285 |
619 |
364 |
163 |
1,226 |
|
| Sangamon River at Monticello |
550 |
114 |
34 |
144 |
50 |
12 |
463 |
|
| So. Fork Sangamon near Rochester |
867 |
74 |
85 |
213 |
68 |
6 |
512 |
|
| Illinois River at Valley City |
26,743 |
85 |
11,562 |
13,705 |
11,800 |
7,619 |
22,380 |
|
| Macoupin Creek near Kane |
868 |
96 |
66 |
207 |
78 |
14 |
535 |
|
| Vermilion River near Danville |
1,290 |
102 |
275 |
391 |
171 |
51 |
1,001 |
|
| Kaskaskia River at Vandalia |
1,940 |
54 |
147 |
970 |
946 |
103 |
2,168 |
|
| Shoal Creek near Breese |
735 |
81 |
137 |
218 |
74 |
17 |
664 |
|
| Embarras River at Ste. Marie |
1,516 |
112 |
93 |
421 |
195 |
61 |
924 |
|
| Skillet Fork at Wayne City |
464 |
106 |
946 |
141 |
25 |
1 |
472 |
|
| Little Wabash below Clay City |
1,131 |
109 |
417 |
397 |
113 |
16 |
1,218 |
|
| Big Muddy at Plumfield |
794 |
53 |
271 |
304 |
225 |
56 |
660 |
|
| Cache River at Forman |
244 |
101 |
159 |
70 |
23 |
4 |
202 |
|
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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 |