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

Provisional Monthly Streamflow Network - Tabular Data: January 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	4,400	3,634	3,206	1,406	6,916	5437500
Rock River near Joslin	9,549	86	8,806	6,010	5,165	2,052	12,860	5446500
Pecatonica River at Freeport	1,326	111	N/A	819	665	320	1,663	5435500
Green River near Geneseo	1,003	90	N/A	594	418	103	1,429	5447500
Edwards River near New Boston	445	90	N/A	252	141	27	635	5466500
Kankakee River at Momence	2,294	113	N/A	2,370	2,216	834	4,624	5520500
Iroquois River near Chebanse	2,091	102	N/A	2,111	1,679	151	4,794	5526000
Fox River at Dayton	2,642	111	N/A	1,628	1,237	440	3,333	5552500
Vermilion River at Pontiac	579	83	N/A	442	260	11	1,222	5554500
Spoon River at Seville	1,636	111	N/A	1,036	657	86	2,908	5570000
LaMoine River at Ripley	1,293	105	N/A	638	345	35	1,601	5585000
Bear Creek near Marcelline	349	82	N/A	150	64	4	436	5495500
Mackinaw River near Congerville	767	81	N/A	537	285	26	1,488	5567500
Salt Creek near Greenview	1,804	84	N/A	1,334	860	134	3,377	5582000
Sangamon River at Monticello	550	116	N/A	456	267	19	1,213	5572000
So. Fork Sangamon near Rochester	867	76	N/A	700	384	10	2,340	5576000
Illinois River at Valley City	26,743	87	10,880	22,081	17,120	6,760	47,630	5586100
Macoupin Creek near Kane	868	98	N/A	576	265	7	1,623	5587000
Vermilion River near Danville	1,290	104	N/A	1,249	811	58	3,099	3339000
Kaskaskia River at Vandalia	1,940	56	N/A	2,620	2,091	271	5,338	5592500
Shoal Creek near Breese	735	83	443	746	410	30	2,068	5594000
Embarras River at Ste. Marie	1,516	114	N/A	1,776	1,132	91	4,590	3345500
Skillet Fork at Wayne City	464	108	685	671	380	15	1,965	3380500
Little Wabash below Clay City	1,131	111	763	1,492	801	52	4,367	3379500
Big Muddy at Plumfield	794	55	1,250	904	708	97	2,184	5597000
Cache River at Forman	244	103	570	513	387	41	1,228	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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