05554500 DATA: Discharge Tables, 2003

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 40°52'40", long 88°38'10" (NAD of 1927), in SE1/4SW1/4 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.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1942 to current year.
	STAGE: Water years 1994 to current year.

REVISED RECORDS.-- WDR IL-75-1: Drainage area. WDR IL-83-2: 1951, 1957, 1965(M), 1968, 1970, 1980. WDR IL-98: 1997 (P).

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 619.45 ft above NGVD of 1929. Prior to Nov. 8, 1965, nonrecording gage at same site and datum.

REMARKS.-- An average of 3 ft³/s, diverted 0.5 mi upstream from station for water supply of city of Pontiac, is not included in records.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 13,100 ft³/s, Dec. 4, 1982, gage height; 19.16 ft; no flow for many days in 1953, 1983-84, 1986-91.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor.

Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	11	33	16	75	23	e22	92	172	690	158	107	49
2	11	36	17	81	26	e21	91	264	468	146	95	112
3	11	37	18	62	29	22	92	263	360	125	92	164
4	12	37	17	50	29	24	113	234	307	110	93	100
5	16	38	17	50	32	24	238	710	264	99	136	61

6	19	40	15	47	38	24	538	1450	233	92	121	45
7	14	38	15	42	34	26	532	1050	221	90	87	34
8	14	33	15	38	28	33	1080	802	210	114	71	28
9	15	36	14	35	23	47	973	1440	198	221	61	24
10	15	33	14	36	21	98	701	1860	185	1280	51	17

11	14	31	14	26	17	118	527	1840	175	2060	43	18
12	13	35	13	31	11	103	426	1470	171	1450	40	17
13	15	33	12	33	15	116	344	1030	241	1040	40	15
14	22	28	13	31	16	137	288	787	1400	682	40	14
15	19	28	13	27	17	132	256	1530	1360	486	37	13

16	17	27	14	26	14	105	240	1670	891	558	28	11
17	16	26	15	26	13	92	231	1180	610	488	24	8.3
18	15	25	25	25	13	93	205	875	474	2230	22	8.7
19	18	24	34	23	13	91	185	702	453	4420	18	7.8
20	20	24	44	e21	14	92	175	588	566	2720	14	8.6

21	21	22	56	e20	16	137	176	494	468	1460	13	8.0
22	17	24	53	e19	19	308	171	419	369	968	8.7	7.0
23	19	25	41	e17	22	278	153	376	303	691	7.2	6.8
24	21	24	35	e16	e24	199	137	344	258	509	6.0	5.1
25	24	24	36	16	e25	163	141	317	222	384	4.6	5.2

26	24	24	35	17	e26	147	146	288	196	293	4.1	12
27	25	21	31	16	e25	143	137	259	180	233	3.4	9.8
28	28	20	29	16	e23	134	125	246	161	198	3.3	9.8
29	33	19	28	18	---	128	121	260	152	171	7.7	9.9
30	33	16	29	19	---	122	131	287	146	145	8.7	9.8

31	30	---	35	21	---	107	---	410	---	125	15	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 2003, BY WATER YEAR (WY)
MEAN	139	224	327	357	514	731	802	739	571	327	122	116
MAX	1682	2327	2773	1981	1856	3123	2801	2968	2232	2350	1186	1540
(WY)	1994	1986	1983	1993	2001	1979	1957	1943	1980	1951	1943	1989
MIN	0.000	0.93	4.58	3.03	6.71	23.2	109	71.1	27.0	0.000	0.000	0.000
(WY)	1989	2000	1954	1977	1963	2000	1977	1964	1988	1988	1988	1988

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR		FOR 2003 WATER YEAR		WATER YEARS 1943 - 2003
ANNUAL TOTAL	184169		77278.5
ANNUAL MEAN	505		212		413
HIGHEST ANNUAL MEAN					1094	1993
LOWEST ANNUAL MEAN					49.7	1964
HIGHEST DAILY MEAN	9780	May 13	4420	Jul 19	12300	Dec 4 1982
LOWEST DAILY MEAN	11	Oct 1-3	3.3	Aug 28	0.00	A
ANNUAL SEVEN-DAY MINIMUM	12	Sep 29	5.2	Aug 23	0.00	Jul 1 1988
MAXIMUM PEAK FLOW			4690	Jul 19	13100	Dec 4 1982
MAXIMUM PEAK STAGE			10.73	Jul 19	19.16	Dec 4 1982
INSTANTANEOUS LOW FLOW			3.1	Aug 27,28
ANNUAL RUNOFF (CFSM)	0.87		0.37		0.71
ANNUAL RUNOFF (INCHES)	11.83		4.97		9.70
10 PERCENT EXCEEDS	1190		561		1050
50 PERCENT EXCEEDS	169		37		131
90 PERCENT EXCEEDS	18		13		6.6

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