05529000 DATA: Discharge Tables, 2003

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 42°04'55", long 87°53'25" (NAD of 1927), in SE1/4SE1/4 sec.25, T.42 N., R.11 E., Cook County, Hydrologic Unit 07120004, on right bank 50 ft upstream from Dam No. 2 of Cook County Forest Preserve, 0.3 mi downstream from Lake Avenue Bridge, 1.2 mi upstream from Central Road Bridge, 2.5 mi north of Des Plaines, and at mile 69.3.

DRAINAGE AREA.-- 360 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1940 to current year.
	STAGE: Water years 1994 to current year.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978-91.

REVISED RECORDS.-- WSP 975: 1942. WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder, phone telemeter, and masonry dam. Datum of gage is 626.31 ft above NGVD of 1929. Prior to Apr. 8, 1941, nonrecording gage at same site and datum.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 4,900 ft³/s, Oct. 1, 1986, gage height, 10.88 ft; no flow many days in 1944, 1946 and Aug. 7, 8, 1962.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Flood of July 4, 1938, reached a stage of 9.0 ft, from floodmark, discharge, 5,000 ft³/s.

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	104	62	78	e86	e54	e48	242	1200	423	73	149	89
2	151	62	85	e88	e55	e47	226	1100	369	69	155	91
3	224	64	85	e88	e57	e47	217	616	339	68	230	90
4	262	65	84	e87	e57	e49	455	469	316	80	344	90
5	276	68	83	e86	e57	e52	574	1180	295	202	265	87

6	223	68	80	e86	e57	e58	441	1160	263	288	234	83
7	197	64	79	e87	e56	e62	379	772	243	510	284	81
8	164	62	77	e84	e56	e70	380	638	273	452	268	86
9	137	60	73	e82	e54	e77	376	1000	265	490	223	88
10	117	66	75	e82	e53	e87	404	1070	242	476	183	85

11	91	71	73	e81	e52	97	363	1560	226	419	159	87
12	86	71	72	e78	e50	123	328	1490	210	353	143	90
13	83	69	76	e76	e49	155	314	1070	199	302	133	123
14	74	74	76	e73	e48	167	292	848	183	256	128	188
15	69	79	77	e70	e48	194	272	813	165	553	122	117

16	65	75	80	e66	e48	208	245	687	149	545	113	72
17	63	71	80	e64	e49	223	213	588	138	437	116	59
18	62	73	180	e62	e50	212	189	511	135	470	98	54
19	58	97	183	e59	e50	221	173	450	223	389	81	53
20	56	91	161	e55	e50	269	171	443	186	319	82	51

21	57	104	145	e53	e49	276	169	419	161	338	86	53
22	56	117	e130	e52	e48	250	167	360	141	398	87	68
23	52	125	e115	e52	e47	243	160	316	129	330	81	63
24	54	112	e100	e51	e46	237	155	282	114	259	77	58
25	80	101	e90	e50	e46	268	146	254	104	202	79	55

26	86	94	e84	e50	e47	264	129	234	90	164	86	74
27	79	89	e82	e50	e48	268	117	215	82	139	87	117
28	73	82	e80	e50	e49	289	110	278	81	123	82	92
29	71	80	e79	e52	---	306	104	455	93	118	80	72
30	69	82	e82	e54	---	282	174	336	79	130	76	69

31	65	---	e85	e54	---	255	---	406	---	123	77	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1941 - 2003, BY WATER YEAR (WY)
MEAN	158	213	228	235	320	618	632	421	300	176	133	136
MAX	1453	1187	1368	1046	1070	2216	1990	1557	1299	908	726	1191
(WY)	1987	1986	1983	1960	1974	1979	1993	1996	2000	1993	1972	1972
MIN	0.96	3.02	2.73	2.92	5.01	40.7	57.7	41.5	15.3	6.35	0.81	0.30
(WY)	1945	1954	1945	1945	1963	1945	1945	1946	1963	1946	1944	1944

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR		FOR 2003 WATER YEAR		WATER YEARS 1941 - 2003
ANNUAL TOTAL	97676		68362
ANNUAL MEAN	268		187		297
HIGHEST ANNUAL MEAN					656	1993
LOWEST ANNUAL MEAN					31.4	1963
HIGHEST DAILY MEAN	1890	Aug 23	1560	May 11	4870	Oct 1 1986
LOWEST DAILY MEAN	47	Sep 17	46 A	Feb 24,25	0.00 B
ANNUAL SEVEN-DAY MINIMUM	53	Sep 12	47	Feb 21	0.00	Aug 10 1944
MAXIMUM PEAK FLOW			1630	May 11	4900	Oct 1 1986
MAXIMUM PEAK STAGE			3.86	May 11	10.88	Oct 1 1986
INSTANTANEOUS LOW FLOW			C
ANNUAL RUNOFF (CFSM)	0.74		0.52		0.83
ANNUAL RUNOFF (INCHES)	10.09		7.06		11.21
10 PERCENT EXCEEDS	656		405		774
50 PERCENT EXCEEDS	142		91		138
90 PERCENT EXCEEDS	66		53		12

	A - Estimated.
	B - Many days in 1944, 1946 and Aug. 7, 8, 1962.
	C - Minimum not determined. Occurred during period of ice effect.