USGS CD-ROM: Current Year Discharge

05555300 VERMILION RIVER NEAR LEONORE, IL

LOCATION.--Lat 41°12'30", long 88°55'51", in SW¼SW¼ sec.30, T.32 N., R.3 E., La Salle County, Hydrologic Unit 07130002, on left downstream side of bridge on County Highway 57 (Red, White and Blue Bridge Road), 3 mi northeast of Leonore, 6.2 mi downstream from Otter Creek, 8 mi northwest of Streator, and at mile 17.2.

DRAINAGE AREA.--1,251 mi².

PERIOD OF RECORD.--May 1931 to current year. Prior to October 1971, published as "at Lowell."

REVISED RECORDS.--WSP 745: 1931-32. WSP 1308: 1932(M), 1935-38(M), 1940(M), 1942(M). WDR IL-75-1: Drainage area.

GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 520.58 ft above sea level. Prior to Aug. 20, 1952, nonrecording gage at site 6.8 mi downstream at datum 19.97 ft lower. Aug. 20, 1952 to Sept. 30, 1971, nonrecording gage at site 6.7 mi downstream at datum 19.97 ft lower.

REMARKS.--Records fair except those for estimated daily discharges, which are poor. U.S. Army Corps of Engineers satellite telemeter at station.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 33,500 ft³/s, July 15, 1958, gage height, 15.30 ft, from graph based on gage readings, site and datum then in use; maximum gage height, 27.13 ft, Dec. 4, 1982, present site; minimum discharge, 2.6 ft³/s, Aug. 3, 1988.

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	17	51	443	e335	1730	1460	2230	5890	660	1340	145	20
2	15	38	311	e345	2580	1250	2340	6080	588	1240	130	19
3	12	34	249	429	2480	1110	2090	4560	541	867	117	20
4	10	34	227	791	2000	999	1810	3080	509	735	108	20
5	10	34	210	1860	1640	889	1580	2770	476	1070	118	18

6	9.1	34	178	2610	1350	793	1400	3550	452	3440	112	17
7	11	35	147	2810	1170	736	1310	7040	422	8900	136	20
8	12	39	128	3420	1040	904	1540	14400	396	11000	121	20
9	11	63	119	5170	926	3360	2150	16200	645	6420	104	18
10	11	58	e130	4880	851	4970	2090	11600	1190	3320	94	15

11	9.1	50	e142	3350	1740	4170	1740	7170	5950	2080	85	15
12	8.6	47	e152	2380	4600	3090	1500	4140	9390	1470	48	16
13	14	44	e160	1770	3880	2440	1370	3050	8290	1090	27	17
14	16	40	e160	1410	2830	2130	1350	2400	5090	847	56	22
15	12	42	158	1290	2170	2020	1340	1970	4110	686	54	25

16	10	44	131	1150	1790	1900	1280	1680	3490	570	48	26
17	9.5	40	119	980	1640	2810	1170	1420	3740	481	46	28
18	9.1	35	122	807	2050	11600	1060	1230	3290	417	45	28
19	9.7	34	133	681	2450	12600	944	1100	3310	370	45	22
20	15	35	153	592	2230	9040	906	1050	2870	341	42	19

21	17	35	173	600	1860	6850	1020	1090	2200	445	41	17
22	11	34	184	583	1570	7520	1520	997	1720	558	37	15
23	9.4	34	189	551	1370	7230	1520	900	1410	668	33	15
24	13	34	207	504	1240	5130	1270	890	1200	631	31	15
25	18	33	e430	466	1120	3740	1100	954	1040	480	27	15

26	16	26	e800	432	1040	3030	1010	864	905	356	28	16
27	28	22	e840	409	1270	2530	894	752	795	290	24	13
28	23	75	e600	396	1630	2260	772	688	709	250	28	12
29	30	621	441	419	---	2380	745	638	637	217	29	14
30	37	554	389	640	---	2260	1220	610	946	188	25	16

31	42	---	344	1010	---	2040	---	711	---	164	21	---

TOTAL	475.5	2299	8169	43070	52247	113241	42271	109474	66971	50931	2005	553
MEAN	15.3	76.6	264	1389	1866	3653	1409	3531	2232	1643	64.7	18.4
MAX	42	621	840	5170	4600	12600	2340	16200	9390	11000	145	28
MIN	8.6	22	119	335	851	736	745	610	396	164	21	12
CFSM	.01	.06	.21	1.11	1.49	2.92	1.13	2.82	1.78	1.31	.05	.01
IN.	.01	.07	.24	1.28	1.55	3.37	1.26	3.26	1.99	1.51	.06	.02

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1972 - 1998, BY WATER YEAR (WY)
MEAN	472	797	1097	960	1300	2196	1931	1653	1336	734	366	446
MAX	3188	4978	6201	4259	3681	7649	5098	5152	4442	2966	2678	3997
(WY)	1987	1986	1983	1993	1997	1979	1982	1995	1980	1993	1981	1993
MIN	11.4	11.4	11.4	6.36	40.9	192	208	241	78.5	8.83	6.89	13.3
(WY)	1972	1972	1977	1977	1977	1996	1977	1992	1988	1988	1988	1991

SUMMARY STATISTICS	FOR 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1972 - 1998
ANNUAL TOTAL	282035.5		491706.5
ANNUAL MEAN	773		1347		1106
HIGHEST ANNUAL MEAN					2419	1993
LOWEST ANNUAL MEAN					280	1977
HIGHEST DAILY MEAN	16000	Feb 21	16200	May 9	30000	Dec 4 1982
LOWEST DAILY MEAN	8.6	Oct 12	8.6	Oct 12	2.6	Aug 3 1988
ANNUAL SEVEN-DAY MINIMUM	10	Oct 6	10	Oct 6	3.0	Jul 30 1988
INSTANTANEOUS PEAK FLOW			17300	May 9	31800	Dec 4 1982
INSTANTANEOUS PEAK STAGE			20.69	May 9	27.13	Dec 4 1982
INSTANTANEOUS LOW FLOW			7.5	A	2.6	Aug 3 1988
ANNUAL RUNOFF (CFSM)	.62		1.08		.88
ANNUAL RUNOFF (INCHES)	8.39		14.62		12.01
10 PERCENT EXCEEDS	1830		3380		2750
50 PERCENT EXCEEDS	315		600		423
90 PERCENT EXCEEDS	23		17		32

A - Oct. 6, 12, 13.