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

Provisional Monthly Streamflow Network - Tabular Data: March 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	5,311	7,574	7,073	2,949	12,630	5437500
Rock River near Joslin	9,549	86	6,957	11,416	10,430	4,826	18,310	5446500
Pecatonica River at Freeport	1,326	111	987	1,791	1,604	692	3,180	5435500
Green River near Geneseo	1,003	89	551	1,103	963	398	2,266	5447500
Edwards River near New Boston	445	91	135	529	413	146	1,062	5466500
Kankakee River at Momence	2,294	111	3,145	3,372	3,277	1,681	5,157	5520500
Iroquois River near Chebanse	2,091	102	2,119	3,171	2,782	859	6,270	5526000
Fox River at Dayton	2,642	111	2,517	3,422	3,135	1,380	5,915	5552500
Vermilion River at Pontiac	579	83	355	754	672	139	1,567	5554500
Spoon River at Seville	1,636	111	709	1,739	1,339	555	3,975	5570000
LaMoine River at Ripley	1,293	104	178	1,325	945	281	3,486	5585000
Bear Creek near Marcelline	349	81	40	373	247	42	1,002	5495500
Mackinaw River near Congerville	767	81	188	949	767	157	2,391	5567500
Salt Creek near Greenview	1,804	84	642	2,111	1,754	470	4,212	5582000
Sangamon River at Monticello	550	115	241	713	613	150	1,370	5572000
So. Fork Sangamon near Rochester	867	76	168	1,007	724	137	2,059	5576000
Illinois River at Valley City	26,743	87	20,333	35,042	31,370	13,470	55,520	5586100
Macoupin Creek near Kane	868	97	193	893	606	116	2,254	5587000
Vermilion River near Danville	1,290	104	824	1,755	1,500	507	3,125	3339000
Kaskaskia River at Vandalia	1,940	56	662	2,997	2,627	594	6,037	5592500
Shoal Creek near Breese	735	83	373	991	841	182	2,218	5594000
Embarras River at Ste. Marie	1,516	114	695	2,233	2,075	523	4,495	3345500
Skillet Fork at Wayne City	464	107	402	849	743	126	1,870	3380500
Little Wabash below Clay City	1,131	111	749	1,807	1,547	307	3,494	3379500
Big Muddy at Plumfield	794	55	835	1,417	1,186	367	2,616	5597000
Cache River at Forman	244	103	159	637	462	207	1,319	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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Provisional Monthly Streamflow Network - Data Details, Illinois State Water Survey

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