USGS CD-ROM: Current Year Discharge

05554500 VERMILION RIVER AT PONTIAC, IL

LOCATION.--Lat 40°52'40", long 88°38'10", in SE¼SW¼ sec.22, T.28 N., R.5 E., Livingston County, Hydrologic Unit 07130002, near center of span on downstream side of bridge on Vermilion Street in Pontiac, 0.1 mi upstream from State Highway 116, 0.8 mi upstream from Turtle Creek, and at mile 60.3.

DRAINAGE AREA.--579 mi².

PERIOD OF RECORD.--October 1942 to current year.

REVISED RECORDS.--WDR IL-75-1: Drainage area. WDR IL-83-2: 1951, 1957, 1965(M), 1968, 1970, 1980.

GAGE.--Water-stage recorder. Datum of gage is 619.45 ft above sea level. Prior to Nov. 8, 1965, nonrecording gage at same site and datum.

REMARKS.--Records good except those for estimated daily discharges, which are poor. An average of 1.4 ft³/s, diverted 0.5 mi upstream from station for water supply of city of Pontiac, is not included in records. U.S. Army Corps of Engineers satellite telemeter at station.

REVISIONS.--The following peaks above base discharge of 2500 ft³/s for Feb. 21 and Feb. 27 were not published for the water-year 1997.

Date	Time	Discharge	Gage Height
Feb. 21	Unknown	8100e	Unknown
Feb. 27	Unknown	6400e	Unknown

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	.30	12	59	63	608	523	945	5310	323	876	71	13
2	.19	13	46	61	715	455	1040	4120	271	570	62	12
3	.20	13	34	63	657	414	896	2660	250	394	54	14
4	.26	13	26	78	538	378	770	2170	227	510	51	16
5	.24	13	21	180	457	332	658	1820	214	981	53	13

6	.23	16	20	566	382	294	593	3280	198	2850	65	12
7	.23	16	20	783	330	281	569	6130	182	6300	57	12
8	.25	16	19	1200	295	381	673	8440	173	5530	52	11
9	.43	16	19	2540	268	2170	709	8270	233	3030	49	11
10	.23	15	20	2070	252	2950	607	5990	443	1520	46	10

11	.26	15	21	1230	402	2170	519	3280	1660	957	41	8.5
12	.35	10	21	815	1440	1510	478	2010	5420	674	36	8.0
13	.91	9.6	21	579	1350	1140	467	1460	4170	515	33	9.1
14	.36	8.3	19	346	926	1000	478	1110	2350	406	30	7.8
15	.20	9.2	18	430	683	958	484	919	1670	328	27	3.4

16	.19	10	17	399	575	890	464	765	1340	271	27	2.3
17	.25	11	17	320	553	1400	480	642	1400	229	25	2.0
18	.38	8.3	17	261	925	5420	398	555	1150	200	26	3.6
19	.93	6.4	17	e232	1140	5980	352	503	1100	176	26	5.4
20	1.8	6.3	18	e212	933	4200	345	540	1070	186	23	5.7

21	1.9	6.2	20	e208	742	3590	570	558	816	210	21	8.7
22	3.0	6.8	24	198	608	4740	848	475	633	260	19	11
23	5.5	6.5	27	181	536	3940	657	443	538	409	18	8.1
24	5.4	6.7	39	166	486	2590	539	484	470	331	16	12
25	6.3	6.5	68	151	440	1830	474	459	412	211	13	10

26	9.8	4.7	149	139	408	1430	430	392	365	159	14	6.4
27	13	9.0	155	131	452	1160	376	344	323	131	13	6.1
28	16	21	100	132	567	1030	313	312	284	113	13	4.7
29	14	38	99	191	---	1110	309	294	267	100	14	5.0
30	12	65	76	381	---	994	3390	400	536	88	14	6.0

31	11	---	68	472	---	879	---	402	---	78	14	---

TOTAL	106.09	407.5	1295	14778	17668	56139	19831	64537	28488	28593	1023	257.8
MEAN	3.42	13.6	41.8	477	631	1811	661	2082	950	922	33.0	8.59
MAX	16	65	155	2540	1440	5980	3390	8440	5420	6300	71	16
MIN	.19	4.7	17	61	252	281	309	294	173	78	13	2.0
CFSM	.01	.02	.07	.82	1.09	3.13	1.14	3.60	1.64	1.59	.06	.01
IN.	.01	.03	.08	.95	1.14	3.61	1.27	4.15	1.83	1.84	.07	.02

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 1998, BY WATER YEAR (WY)
MEAN	140	236	347	376	497	757	815	737	553	327	128	125
MAX	1682	2327	2773	1981	1758	3123	2801	2968	2232	2350	1186	1540
(WY)	1994	1986	1983	1993	1997	1979	1957	1943	1980	1951	1943	1989
MIN	.000	1.46	4.58	3.03	6.71	23.7	109	71.1	27.0	.000	.000	.000
(WY)	1989	1954	1954	1977	1963	1964	1977	1964	1988	1988	1988	1988

SUMMARY STATISTICS	FOR 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1943 - 1998
ANNUAL TOTAL	134338.39		233123.39
ANNUAL MEAN	368		639		419
HIGHEST ANNUAL MEAN					1094	1993
LOWEST ANNUAL MEAN					49.7	1964
HIGHEST DAILY MEAN	7800 A	Feb 21	8440	May 8	12300	Dec 4 1982
LOWEST DAILY MEAN	.19	Oct 2, 16	.19	Oct 2, 16	.00	B
ANNUAL SEVEN-DAY MINIMUM	.23	Oct 2	.23	Oct 2	.00	Jul 1 1988
INSTANTANEOUS PEAK FLOW			8940	May 8	13100	Dec 4 1982
INSTANTANEOUS PEAK STAGE			16.19	May 8	19.16	Dec 4 1982
INSTANTANEOUS LOW FLOW			.16	Oct 2
ANNUAL RUNOFF (CFSM)	.64		1.10		.72
ANNUAL RUNOFF (INCHES)	8.63		14.98		9.84
10 PERCENT EXCEEDS	830		1510		1070
50 PERCENT EXCEEDS	114		214		134
90 PERCENT EXCEEDS	8.3		6.3		6.9

A - Estimated.
B - Many days in 1953, 1983-84, 1986-91.