05554500 DATA: Discharge Tables, 2004

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 2003 TO SEPTEMBER 2004 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	8.3	35	449	e250	103	129	2040	428	3510	120	41	171
2	6.2	30	377	248	106	141	1570	568	2200	110	34	117
3	7.0	30	339	251	109	139	1190	527	1430	107	27	86
4	7.4	33	327	253	109	138	938	495	1030	108	33	68
5	8.8	39	330	232	102	995	740	458	803	127	32	57

6	8.8	54	320	146	101	1970	613	399	666	120	40	47
7	8.0	72	311	176	106	1370	560	367	561	106	36	38
8	7.7	68	386	194	106	977	497	373	479	96	26	34
9	6.3	58	550	197	98	705	437	388	415	89	20	32
10	6.6	51	700	185	93	537	369	352	390	316	18	30

11	6.3	44	974	175	93	437	331	595	726	774	16	25
12	6.0	39	802	190	91	397	300	923	1790	536	16	20
13	6.7	37	608	195	88	336	284	781	1520	356	15	17
14	17	39	513	189	85	291	276	1020	1140	425	14	15
15	13	40	472	170	85	284	256	2040	873	386	12	16

16	e11	37	e430	205	82	260	239	1810	664	255	9.5	24
17	e9.5	38	e390	202	78	249	231	1260	529	198	8.1	30
18	e10	436	e360	184	79	242	217	957	492	184	8.5	45
19	e11	4070	e300	126	92	227	201	948	410	173	103	49
20	e12	3870	e290	172	171	197	229	901	338	143	112	40

21	13	2270	e295	160	408	192	387	732	314	116	78	31
22	14	1460	e310	143	422	181	587	610	311	98	66	26
23	14	1100	e310	135	310	170	457	554	276	85	51	22
24	14	1250	e370	146	273	176	383	537	234	73	38	18
25	22	1450	e390	135	238	183	519	590	208	63	50	17

26	29	1090	e350	122	188	248	743	1030	185	55	215	17
27	46	865	e310	132	153	1160	590	926	169	51	705	14
28	58	714	e300	118	134	1270	471	707	157	46	418	13
29	48	607	e295	115	123	1760	403	537	146	41	299	12
30	43	525	e285	107	---	2010	367	1100	133	41	312	11

31	37	---	e270	103	---	1980	---	3840	---	43	259	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 2004, BY WATER YEAR (WY)
MEAN	137	232	328	354	508	730	798	741	574	325	122	115
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	0.00	0.93	4.58	3.03	6.71	23.2	109	71.1	27.0	0.00	0.00	0.00
(WY)	1989	2000	1954	1977	1963	2000	1977	1964	1988	1988	1988	1988

SUMMARY STATISTICS	FOR 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1943 - 2004
ANNUAL TOTAL	108752.1		137584.7
ANNUAL MEAN	298		376		413
HIGHEST ANNUAL MEAN					1094	1993
LOWEST ANNUAL MEAN					49.7	1964
HIGHEST DAILY MEAN	4420	Jul 19	4070	Nov 19	12300	Dec 4 1982
LOWEST DAILY MEAN	3.3	Aug 28	6.0	Oct 12	0.00	A
ANNUAL SEVEN-DAY MINIMUM	5.2	Aug 23	6.8	Oct 7	0.00	A
MAXIMUM PEAK FLOW			4590	Nov 19	13100	Dec 4 1982
MAXIMUM PEAK STAGE			10.59	Nov 19	19.16	Dec 4 1982
INSTANTANEOUS LOW FLOW			5.6	Oct 9-12
ANNUAL RUNOFF (CFSM)	0.515		0.649		0.713
ANNUAL RUNOFF (INCHES)	6.99		8.84		9.68
10 PERCENT EXCEEDS	802		951		1050
50 PERCENT EXCEEDS	100		190		132
90 PERCENT EXCEEDS	10		16		6.7

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