Provisional Monthly Streamflow Network - Data Details, Illinois State Water Survey

Provisional Monthly Streamflow Network - Tabular Data: November 2025

Choose another month

				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	86	2,810	3,874	3,451	1,397	6,917	5437500
Rock River near Joslin	9,549	86	3,590	5,645	4,996	2,067	10,120	5446500
Pecatonica River at Freeport	1,326	111	651	813	698	336	1,380	5435500
Green River near Geneseo	1,003	90	102	459	331	82	1,195	5447500
Edwards River near New Boston	445	91	32	166	83	20	417	5466500
Kankakee River at Momence	2,294	113	1,206	1,623	1,273	704	2,880	5520500
Iroquois River near Chebanse	2,091	102	111	996	503	97	2,598	5526000
Fox River at Dayton	2,642	111	916	1,573	1,375	518	3,130	5552500
Vermilion River at Pontiac	579	83	5	245	70	7	764	5554500
Spoon River at Seville	1,636	111	92	612	329	65	1,585	5570000
LaMoine River at Ripley	1,293	104	18	510	180	24	1,280	5585000
Bear Creek near Marcelline	349	82	N/A	145	22	1	356	5495500
Mackinaw River near Congerville	767	81	9	291	75	13	789	5567500
Salt Creek near Greenview	1,804	84	134	820	347	121	2,405	5582000
Sangamon River at Monticello	550	116	0	248	86	9	771	5572000
So. Fork Sangamon near Rochester	867	76	2	297	73	4	807	5576000
Illinois River at Valley City	26,743	87	4,544	15,176	11,525	5,949	34,520	5586100
Macoupin Creek near Kane	868	97	18	322	90	8	847	5587000
Vermilion River near Danville	1,290	104	62	627	307	53	1,355	3339000
Kaskaskia River at Vandalia	1,940	56	90	876	644	65	2,239	5592500
Shoal Creek near Breese	735	83	25	334	139	18	928	5594000
Embarras River at Ste. Marie	1,516	114	32	724	326	29	1,817	3345500
Skillet Fork at Wayne City	464	108	8	267	90	2	771	3380500
Little Wabash below Clay City	1,131	111	54	582	261	14	1,630	3379500
Big Muddy at Plumfield	794	55	59	373	144	42	1,063	5597000
Cache River at Forman	244	103	109	192	81	4	571	3612000

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 2024.

For best results when printing this page, change your layout to "Landscape".

Streamflow Data

WARM Home | Contact WARM | Back to Top

Illinois State Water Survey

2204 Griffith Dr., MC-674
Champaign, IL 61820-7463
217-244-5459
Email us with questions or comments.

© 2022 University of Illinois Board of Trustees. All rights reserved.
For permissions information, contact the Illinois State Water Survey.
Terms of use | Privacy Policy | Web Administrator.
Accessibility

Provisional Monthly Streamflow Network - Data Details, Illinois State Water Survey

Prairie Research Institute State Scientific Surveys

Navigation

Water and Atmospheric Resources Monitoring Program (WARM)