05529000 DATA: Discharge Tables, 2002

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 1994-2002.
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, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	202	843	419	e128	195	381	280	420	159	102	77	83
2	177	795	395	e120	212	365	296	716	140	95	72	246
3	161	743	376	e120	213	371	300	542	174	83	72	330
4	160	677	361	130	198	318	286	438	1240	75	82	245
5	267	602	351	128	165	315	280	383	1820	67	106	216

6	216	513	337	129	173	319	269	354	1590	74	75	180
7	172	407	312	129	174	332	283	336	1160	74	64	137
8	151	333	287	127	173	558	449	317	812	66	59	105
9	139	296	264	129	196	879	933	362	735	117	57	91
10	134	276	252	133	300	870	968	338	699	101	56	80

11	157	261	238	133	357	789	896	442	738	84	57	64
12	301	244	232	136	361	750	863	1430	703	87	58	59
13	995	228	361	137	372	726	840	1100	642	80	239	55
14	2890	218	366	140	355	705	828	790	607	72	403	51
15	2470	227	347	145	335	679	818	664	576	69	189	52

16	1950	262	337	148	309	641	795	713	497	67	120	49
17	1480	294	337	150	285	606	765	781	410	66	93	47
18	951	316	329	142	266	569	714	640	323	70	72	57
19	783	317	338	140	297	519	651	523	264	68	86	126
20	721	298	333	139	472	459	607	436	230	66	75	193

21	657	271	311	134	569	390	621	370	220	63	92	161
22	605	249	289	117	581	336	613	322	203	68	1860	208
23	1690	231	294	121	557	304	565	286	180	75	1890	152
24	2140	245	278	126	541	275	512	260	162	72	873	108
25	2180	280	246	129	522	249	475	255	148	70	473	86

26	1960	262	213	127	498	233	438	256	134	74	287	74
27	1690	246	e180	131	476	220	432	229	144	87	206	66
28	1400	232	e165	139	437	221	472	212	125	88	155	57
29	1140	252	e150	145	---	273	437	201	115	103	120	115
30	987	361	e140	144	---	344	406	194	107	92	105	149

31	905	---	e133	164	---	300	---	179	---	81	91	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1941 - 2002, BY WATER YEAR (WY)
MEAN	158.8	215.3	229.7	237.2	324.5	625.2	637.9	416.5	301.6	174.2	133.0	136.9
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 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1941 - 2002
ANNUAL TOTAL	180359		138626
ANNUAL MEAN	494.1		379.8		298.8
HIGHEST ANNUAL MEAN					656	1993
LOWEST ANNUAL MEAN					31.4	1963
HIGHEST DAILY MEAN	2890	Oct 14	2890	Oct 14	4870	Oct 1 1986
LOWEST DAILY MEAN	53	Aug 8	47	Sep 17	0.00	A
ANNUAL SEVEN-DAY MINIMUM	90	Aug 3	53	Sep 12	0.00	Aug 10 1944
MAXIMUM PEAK FLOW			2970	Oct 14	4900	Oct 1 1986
MAXIMUM PEAK STAGE			7.38	Oct 14	10.88	Oct 1 1986
INSTANTANEOUS LOW FLOW			45	Sep 17
ANNUAL RUNOFF (CFSM)	1.37		1.05		0.83
ANNUAL RUNOFF (INCHES)	18.64		14.32		11.28
10 PERCENT EXCEEDS	929		795		780
50 PERCENT EXCEEDS	361		262		138
90 PERCENT EXCEEDS	148		75		12

A - Many days in 1944, 1946, and Aug. 7, 8, 1962.