05540160 DATA: Discharge Tables, 2004

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 41°49'54", long 88°02'51" (NAD of 1927), in SE1/4SW1/4 sec.25, T.39 N., R.10 E., Du Page County, Hydrologic Unit 07120004, on upstream side of bridge on State Highway 56, 2.2 mi northwest of Downers Grove, and at mile 15.0.

DRAINAGE AREA.-- 26.6 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1989 to current year.
	STAGE: Water years 1994 to current year.
	PARTIAL RECORD: Annual maximum, water years 1961-76.

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 660.00 ft above NGVD of 1929. Prior to July 19, 1989, at datum 12.21 ft higher.

REMARKS.-- Diurnal fluctuation at low flow caused by sewage-treatment plants upstream from station.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,720 ft³/s, Aug. 26, 1972, gage height, 16.94 ft; minimum discharge, 3.6 ft³/s, Dec. 19, 1989.

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	19	22	33	29	23	46	75	34	e230	e27	e33	32
2	19	41	30	28	23	50	58	31	e150	e28	e32	28
3	23	149	29	28	25	43	50	30	e110	e35	e35	26
4	22	132	34	28	23	64	43	28	e75	e54	e90	25
5	20	242	61	30	23	308	41	27	e60	e35	e60	25

6	19	107	48	27	22	214	39	27	e50	e48	e40	25
7	19	60	41	27	23	120	38	28	e42	e59	e30	23
8	18	45	37	26	23	83	37	28	e36	e34	e25	22
9	19	37	44	26	24	66	34	26	e33	e45	e24	22
10	18	33	222	25	23	53	32	26	e100	e74	e23	22

11	18	32	179	26	22	47	31	27	202	e49	e22	21
12	18	30	103	27	23	41	31	29	329	e50	e22	21
13	18	26	64	26	22	38	30	40	218	e38	21	21
14	71	25	52	26	24	48	29	133	e130	e31	21	20
15	50	26	45	24	23	41	28	128	e150	e28	21	23

16	38	26	42	25	22	39	28	68	e70	e24	22	28
17	32	26	37	28	23	39	28	48	e56	e21	27	23
18	29	217	35	27	22	42	27	59	e46	e22	27	22
19	26	175	33	25	24	44	27	52	e40	e22	31	21
20	25	94	32	25	55	52	32	47	e35	e22	27	19

21	24	64	31	24	64	46	46	70	e50	e28	27	22
22	23	52	32	23	54	42	39	119	e68	e30	23	21
23	22	68	31	23	63	37	33	118	e52	e29	22	20
24	22	98	30	23	65	63	34	76	e44	e28	62	20
25	41	66	28	23	55	65	66	63	e38	e26	53	20

26	29	52	27	23	47	162	48	51	e35	e25	59	19
27	26	46	27	24	42	114	36	42	e29	e23	50	19
28	25	41	37	23	40	136	33	35	e31	e21	163	19
29	24	37	35	23	38	279	29	32	e29	e21	76	19
30	23	35	32	22	---	175	32	85	e27	e23	48	19

31	23	---	30	22	---	104	---	e250	---	e34	38	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1990 - 2004, BY WATER YEAR (WY)
MEAN	41.0	47.8	37.6	44.2	52.7	57.5	69.7	70.9	58.1	38.8	41.2	34.6
MAX	142	92.8	56.2	100	138	87.8	139	123	97.2	96.5	63.4	83.3
(WY)	2002	1991	1991	1993	1997	1993	1993	2003	1993	1996	1998	2001
MIN	18.5	20.5	16.3	19.2	22.5	29.9	33.3	22.2	21.5	19.9	18.4	19.7
(WY)	1990	2000	1990	2003	2003	1996	1990	1992	1992	1991	1991	1995

SUMMARY STATISTICS	FOR 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1990 - 2004
ANNUAL TOTAL	16751		17406
ANNUAL MEAN	45.9		47.6		49.5
HIGHEST ANNUAL MEAN					64.1	1993
LOWEST ANNUAL MEAN					38.5	1994
HIGHEST DAILY MEAN	472	May 1	329	Jun 12	961	Oct 14 2001
LOWEST DAILY MEAN	18	A	18	B	11	C
ANNUAL SEVEN-DAY MINIMUM	18	Jan 14	18	Oct 7	12	Aug 14 1992
MAXIMUM PEAK FLOW			372	Nov 4	1040	Oct 14 2001
MAXIMUM PEAK STAGE			13.14	Nov 4	16.28	Oct 14 2001
INSTANTANEOUS LOW FLOW			12	Oct 13	3.6	Dec 19 1989
ANNUAL RUNOFF (CFSM)	1.73		1.79		1.86
ANNUAL RUNOFF (INCHES)	23.43		24.34		25.27
10 PERCENT EXCEEDS	81		86		91
50 PERCENT EXCEEDS	29		32		32
90 PERCENT EXCEEDS	20		22		19