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

Provisional Monthly Streamflow Network - Tabular Data: December 2024

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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	N/A	3,703	3,230	1,288	6,242	5437500
Rock River near Joslin	9,549	86	5,181	5,700	5,107	1,984	10,200	5446500
Pecatonica River at Freeport	1,326	111	N/A	759	636	305	1,426	5435500
Green River near Geneseo	1,003	89	240	533	427	87	1,373	5447500
Edwards River near New Boston	445	91	63	205	121	18	432	5466500
Kankakee River at Momence	2,294	111	N/A	2,069	1,839	833	3,787	5520500
Iroquois River near Chebanse	2,091	102	N/A	1,625	1,139	134	4,045	5526000
Fox River at Dayton	2,642	111	N/A	1,649	1,405	496	3,401	5552500
Vermilion River at Pontiac	579	83	N/A	392	170	8	1,070	5554500
Spoon River at Seville	1,636	111	215	738	401	65	1,790	5570000
LaMoine River at Ripley	1,293	104	79	542	238	28	1,472	5585000
Bear Creek near Marcelline	349	81	N/A	159	33	1	487	5495500
Mackinaw River near Congerville	767	81	15	462	226	16	1,398	5567500
Salt Creek near Greenview	1,804	84	311	1,105	657	106	2,837	5582000
Sangamon River at Monticello	550	115	N/A	370	180	12	1,118	5572000
So. Fork Sangamon near Rochester	867	76	134	566	147	7	1,694	5576000
Illinois River at Valley City	26,743	87	6,183	18,530	15,400	6,778	37,150	5586100
Macoupin Creek near Kane	868	97	116	505	155	8	1,514	5587000
Vermilion River near Danville	1,290	104	845	971	555	62	2,625	3339000
Kaskaskia River at Vandalia	1,940	56	457	1,925	1,620	235	5,780	5592500
Shoal Creek near Breese	735	83	391	608	196	19	1,762	5594000
Embarras River at Ste. Marie	1,516	114	225	1,303	777	39	3,501	3345500
Skillet Fork at Wayne City	464	107	645	463	207	5	1,264	3380500
Little Wabash below Clay City	1,131	111	513	1,090	503	22	2,706	3379500
Big Muddy at Plumfield	794	55	433	676	355	50	1,877	5597000
Cache River at Forman	244	103	492	355	213	13	931	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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