05537500 DATA: Discharge Tables, 2004

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 41°38'33", long 87°59'57" (NAD of 1927), in SW1/4SE1/4 sec.32, T.37 N., R.11 E., Cook County, Hydrologic Unit 07120004, on left bank at downstream side of bridge on State Street, 2 mi south of Lemont, and at mile 5.4.

DRAINAGE AREA.-- 20.9 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: July 1951 to current year.
	STAGE: Water years 1994 to current year.

REVISED RECORDS.-- WSP 1338: 1952(M). WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 637.20 ft above NGVD of 1929.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 5,310 ft³/s, July 18, 1996, from rating curve extended above 2,800 ft³/s, gage height, 11.10 ft; no flow at times in most years.

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	2.6	2.4	12	9.0	e5.2	18	31	23	142	3.9	2.6	27
2	2.6	62	10	9.0	e5.0	20	25	17	72	3.5	6.9	17
3	3.9	95	9.7	8.8	e5.2	15	21	12	54	4.4	12	14
4	4.9	57	9.7	9.6	e5.0	33	19	9.0	34	6.7	64	12
5	3.3	118	36	11	e4.8	329	14	7.7	24	4.5	24	9.2

6	2.5	55	42	10	e5.1	155	12	6.8	18	13	11	7.5
7	2.0	31	26	7.9	e5.6	76	11	7.6	14	23	6.9	6.0
8	1.9	20	19	e7.6	e5.6	50	10	6.8	11	8.1	5.1	4.9
9	1.8	14	23	e7.0	e5.4	37	9.0	6.1	8.9	6.6	4.2	4.7
10	1.7	12	142	e6.2	e5.2	29	8.3	9.6	17	11	3.6	3.9

11	1.8	11	80	e5.5	e5.1	24	7.8	6.5	100	6.2	3.5	3.2
12	3.2	11	39	e5.2	e5.0	16	7.3	7.1	459	4.8	3.1	3.0
13	3.8	8.9	25	e5.2	e4.9	14	6.8	53	193	4.1	3.0	2.9
14	15	7.5	20	e5.1	e4.9	19	6.1	302	96	4.4	2.8	2.9
15	11	7.0	17	e4.9	e4.8	17	5.7	230	64	3.5	2.6	3.6

16	7.0	7.2	16	e4.3	e4.7	16	5.4	85	43	3.1	2.3	27
17	5.3	7.8	14	e3.9	e4.7	13	5.8	49	31	2.9	2.8	11
18	3.4	198	12	e4.7	e4.7	15	5.4	100	21	2.7	3.2	6.1
19	3.2	221	11	e4.3	e5.0	18	4.8	72	15	2.6	4.0	4.1
20	3.1	84	12	e4.1	e6.0	17	13	45	12	2.7	3.2	3.4

21	3.3	50	9.1	e3.9	e45	15	48	55	13	5.4	2.8	3.0
22	3.0	36	9.0	e3.8	e26	12	20	41	13	16	2.6	2.7
23	2.6	56	9.5	e3.8	e30	11	13	71	8.7	14	2.6	2.7
24	2.5	139	9.2	e3.8	41	18	10	41	7.2	5.6	3.4	2.9
25	12	56	10	e3.9	26	27	35	38	6.8	3.9	19	3.3

26	8.2	37	8.7	e4.2	19	34	20	29	5.8	3.1	37	3.2
27	5.1	27	7.4	e4.7	15	33	13	22	5.1	2.8	67	3.0
28	3.7	20	12	e5.2	14	56	9.9	17	5.3	2.8	549	4.0
29	3.1	16	15	e6.0	13	144	7.7	13	4.9	2.9	151	4.0
30	2.7	14	12	e5.8	---	65	15	93	4.1	3.0	62	3.5

31	2.7	---	10	e5.6	---	45	---	236	---	3.2	38	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2004, BY WATER YEAR (WY)
MEAN	10.0	14.4	16.4	16.3	21.6	34.2	36.1	24.7	19.0	12.0	6.30	7.74
MAX	163	71.9	92.2	75.5	104	131	86.9	74.5	89.6	126	35.7	74.9
(WY)	1955	1986	1983	1993	1997	1979	1975	1966	1993	1996	2004	1961
MIN	0.00	0.01	0.02	0.02	0.03	2.19	1.69	2.83	0.73	0.05	0.00	0.00
(WY)	1965	1972	1964	1977	1964	1964	1963	1958	1988	1961	1964	1963

SUMMARY STATISTICS	FOR 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1951 - 2004
ANNUAL TOTAL	6622.17		9336.2
ANNUAL MEAN	18.1		25.5		18.1
HIGHEST ANNUAL MEAN					39.9	1993
LOWEST ANNUAL MEAN					3.37	1963
HIGHEST DAILY MEAN	504	Jul 27	549	Aug 28	2190	Jul 18 1996
LOWEST DAILY MEAN	0.71	Jul 4	1.7	Oct 10	0.00	A
ANNUAL SEVEN-DAY MINIMUM	0.99	Jun 28	2.1	Oct 6	0.00	A
MAXIMUM PEAK FLOW			1090	Aug 28	5310 B	Jul 18 1996
MAXIMUM PEAK STAGE			7.46	Aug 28	11.10	Jul 18 1996
INSTANTANEOUS LOW FLOW			1.6	Oct 9-11
ANNUAL RUNOFF (CFSM)	0.868		1.22		0.868
ANNUAL RUNOFF (INCHES)	11.79		16.62		11.80
10 PERCENT EXCEEDS	42		56		42
50 PERCENT EXCEEDS	7.0		9.1		5.4
90 PERCENT EXCEEDS	1.3		3.0		0.17

	A - At times in most years.
	B - From rating curve extended above 2,800 ft³/s.