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

Provisional Monthly Streamflow Network - Tabular Data: November 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	4,781	3,863	3,439	1,397	6,917	5437500
Rock River near Joslin	9,549	86	6,976	5,638	4,988	2,067	10,120	5446500
Pecatonica River at Freeport	1,326	111	1,140	809	698	336	1,380	5435500
Green River near Geneseo	1,003	89	225	461	340	82	1,195	5447500
Edwards River near New Boston	445	91	38	168	85	20	417	5466500
Kankakee River at Momence	2,294	111	1,147	1,627	1,318	704	2,880	5520500
Iroquois River near Chebanse	2,091	102	177	1,004	521	97	2,598	5526000
Fox River at Dayton	2,642	111	1,538	1,573	1,374	506	3,334	5552500
Vermilion River at Pontiac	579	83	12	248	70	7	764	5554500
Spoon River at Seville	1,636	111	211	616	329	65	1,585	5570000
LaMoine River at Ripley	1,293	104	85	514	188	24	1,280	5585000
Bear Creek near Marcelline	349	81	21	146	22	1	356	5495500
Mackinaw River near Congerville	767	81	24	294	75	13	789	5567500
Salt Creek near Greenview	1,804	84	369	825	346	121	2,405	5582000
Sangamon River at Monticello	550	115	116	249	85	9	771	5572000
So. Fork Sangamon near Rochester	867	76	691	291	73	4	807	5576000
Illinois River at Valley City	26,743	87	9,330	15,176	11,525	5,949	34,520	5586100
Macoupin Creek near Kane	868	97	617	319	89	8	847	5587000
Vermilion River near Danville	1,290	104	567	627	301	53	1,508	3339000
Kaskaskia River at Vandalia	1,940	56	412	884	655	76	2,774	5592500
Shoal Creek near Breese	735	83	1,215	324	128	18	865	5594000
Embarras River at Ste. Marie	1,516	114	103	730	332	29	1,817	3345500
Skillet Fork at Wayne City	464	107	272	267	89	2	771	3380500
Little Wabash below Clay City	1,131	111	293	584	261	14	1,630	3379500
Big Muddy at Plumfield	794	55	104	378	148	42	1,063	5597000
Cache River at Forman	244	103	58	193	84	4	571	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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