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

Provisional Monthly Streamflow Network - Tabular Data: October 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	3,490	3,623	3,011	1,093	6,262	5437500
Rock River near Joslin	9,549	86	4,673	5,176	4,213	1,665	8,879	5446500
Pecatonica River at Freeport	1,326	111	772	809	661	319	1,371	5435500
Green River near Geneseo	1,003	89	156	406	220	67	978	5447500
Edwards River near New Boston	445	91	22	149	49	13	456	5466500
Kankakee River at Momence	2,294	111	706	1,287	931	599	2,646	5520500
Iroquois River near Chebanse	2,091	102	66	754	238	63	2,035	5526000
Fox River at Dayton	2,642	111	718	1,264	902	321	2,774	5552500
Vermilion River at Pontiac	579	83	1	171	30	3	637	5554500
Spoon River at Seville	1,636	111	92	538	179	58	1,407	5570000
LaMoine River at Ripley	1,293	104	23	437	113	22	1,584	5585000
Bear Creek near Marcelline	349	81	3	124	13	1	492	5495500
Mackinaw River near Congerville	767	81	9	214	30	9	700	5567500
Salt Creek near Greenview	1,804	84	122	549	224	111	1,698	5582000
Sangamon River at Monticello	550	115	3	176	35	7	600	5572000
So. Fork Sangamon near Rochester	867	76	15	201	26	2	623	5576000
Illinois River at Valley City	26,743	87	4,267	13,160	8,067	5,617	30,100	5586100
Macoupin Creek near Kane	868	97	18	247	40	6	663	5587000
Vermilion River near Danville	1,290	104	60	382	111	44	1,133	3339000
Kaskaskia River at Vandalia	1,940	56	69	560	181	54	2,248	5592500
Shoal Creek near Breese	735	83	49	186	47	10	716	5594000
Embarras River at Ste. Marie	1,516	114	49	430	111	30	1,227	3345500
Skillet Fork at Wayne City	464	107	15	106	12	0	379	3380500
Little Wabash below Clay City	1,131	111	22	236	52	7	814	3379500
Big Muddy at Plumfield	794	55	231	153	76	34	464	5597000
Cache River at Forman	244	103	21	61	16	1	195	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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