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

Provisional Monthly Streamflow Network - Tabular Data: April 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	86	5,973	7,850	6,909	3,161	12,840	5437500
Rock River near Joslin	9,549	86	8,084	11,485	10,310	4,700	18,870	5446500
Pecatonica River at Freeport	1,326	111	1,001	1,322	1,110	514	2,210	5435500
Green River near Geneseo	1,003	90	602	1,099	1,008	379	2,347	5447500
Edwards River near New Boston	445	91	194	571	458	149	1,297	5466500
Kankakee River at Momence	2,294	113	3,531	3,488	3,489	1,807	5,393	5520500
Iroquois River near Chebanse	2,091	102	3,329	3,155	2,926	955	5,945	5526000
Fox River at Dayton	2,642	111	2,610	3,421	3,138	1,207	5,845	5552500
Vermilion River at Pontiac	579	83	499	800	673	191	1,644	5554500
Spoon River at Seville	1,636	111	885	1,932	1,536	448	3,851	5570000
LaMoine River at Ripley	1,293	104	363	1,581	1,291	234	3,284	5585000
Bear Creek near Marcelline	349	82	187	424	310	42	970	5495500
Mackinaw River near Congerville	767	81	355	1,062	924	233	1,984	5567500
Salt Creek near Greenview	1,804	84	1,632	2,393	2,020	793	4,521	5582000
Sangamon River at Monticello	550	116	679	791	669	194	1,648	5572000
So. Fork Sangamon near Rochester	867	76	1,091	1,090	852	153	2,243	5576000
Illinois River at Valley City	26,743	87	29,183	37,733	34,690	15,840	61,280	5586100
Macoupin Creek near Kane	868	97	1,883	1,134	715	129	2,864	5587000
Vermilion River near Danville	1,290	104	2,106	1,899	1,618	537	3,786	3339000
Kaskaskia River at Vandalia	1,940	56	4,335	2,661	2,133	515	5,594	5592500
Shoal Creek near Breese	735	83	2,817	1,052	719	174	2,236	5594000
Embarras River at Ste. Marie	1,516	114	4,908	2,304	1,812	543	4,787	3345500
Skillet Fork at Wayne City	464	108	3,616	824	726	117	1,910	3380500
Little Wabash below Clay City	1,131	111	7,518	1,746	1,303	235	3,830	3379500
Big Muddy at Plumfield	794	55	4,963	1,520	1,294	431	3,113	5597000
Cache River at Forman	244	103	2,426	588	523	112	1,190	3612000

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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.

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Streamflow Data

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