05536358 DATA: Discharge Tables, 2000

Station list Available data
ILLINOIS RIVER BASIN

05536358 CALUMET RIVER BELOW O'BRIEN LOCK AND DAM AT CHICAGO, IL


LOCATION.-- Lat 41°38'53", long 87°33'50" (NAD of 1927), in SE1/4SE1/4 sec.36, T.37 N., R.14 E., Cook County, Hydrologic Unit 07120003, on right bank, 0.7 mi downstream of 130^th Street in Chicago, and 1100 ft below the downstream lock gates at the Thomas J. O'Brien Lock and Dam, and at mile 6.9.

DRAINAGE AREA.-- Indeterminate.

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1996 to cuurent year.

GAGE.-- Water stage recorder, acoustical flowmeter, and phone telemeter. Datum of gage is 579.48 ft above NGVD of 1929 (Chicago City datum).

REMARKS.-- This gaging station provides flow data to determine Illinois' diversion of Lake Michigan water. A U.S. Supreme Court Decree limits Illinois' diversion to an average of 3,200 ft³/s. Illinois' diversion includes water diverted from the lake for domestic water supply, for navigation, and water-quality improvement in the Chicago Sanitary and Ship Canal system, and stormwater runoff from a 673 mi² diverted watershed area. Estimated daily discharges determined from regression equations between USGS mean daily discharges and mean daily discharges for the Obrien Lock and Dam as reported by the Metropolitan Water Reclamation District.

EXTREMES FOR PERIOD OF RECORD.-- --Maximum daily discharge, 1069 ft³/s (estimated), June 21,1997; mimimum daily, -769 ft³/s, Feb. 21, 1997, due to regulation to prevent flooding.

REMARKS FOR CURRENT YEAR.--Records fair except those for estimated daily discharges, which are poor.

Discharge, cubic feet per second, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	189	53	84	65	122	43	90	-43	-2.3	-33	552	306
2	161	59	-27	96	-14	39	70	159	-51	177	300	405
3	220	52	31	68	142	82	14	5.3	262	432	306	750
4	232	32	79	-30	149	-21	47	-85	312	212	418	520
5	144	8.1	119	52	10	70	75	-96	166	187	194	962

6	256	62	38	-0.87	-12	-23	60	-33	357	231	160	561
7	162	60	63	34	80	-60	44	-35	129	246	207	378
8	141	46	55	14	8.7	-52	1.2	-60	9.5	221	89	315
9	236	104	67	36	39	1.7	116	262	121	127	293	389
10	199	55	-38	51	50	60	64	68	108	466	228	320

11	269	32	146	-13	-15	9.6	75	54	-16	238	485	180
12	84	122	101	151	64	-71	170	68	65	333	346	209
13	124	-13	80	25	105	57	59	15	154	541	331	429
14	198	42	126	32	68	-60	53	32	160	449	334	358
15	38	66	58	147	-50	-62	-26	61	68	388	282	298

16	45	78	66	96	8.6	60	-12	93	139	583	247	237
17	193	108	53	206	23	89	0.40	110	206	465	39	186
18	216	72	150	19	102	110	142	153	415	569	337	298
19	110	36	91	-39	6.6	22	100	135	324	839	255	290
20	79	56	-23	-39	39	119	73	105	177	340	185	43

21	77	112	61	100	143	179	-14	125	170	653	329	226
22	41	89	114	60	49	-8.2	125	99	50	388	204	226
23	38	99	43	129	49	90	81	-36	130	630	363	319
24	77	47	103	103	40	35	110	0.04	223	536	535	173
25	108	72	81	179	79	29	74	121	37	203	403	85

26	28	18	13	140	80	-29	134	121	52	572	291	134
27	115	5.2	21	117	21	22	-1.8	-81	173	183	297	224
28	194	-66	188	87	89	18	146	46	33	210	337	309
29	227	18	5.4	70	46	187	90	138	249	516	300	118
30	115	8.0	101	56	---	44	67	66	312	384	251	42

31	200	---	71	154	---	53	---	134	---	234	277	---

TOTAL	4516	1532.3	2120.4	2165.13	1521.9	1033.1	2026.80	1701.34	4532.2	11520	9175	9290
MEAN	146	51.1	68.4	69.8	52.5	33.3	67.6	54.9	151	372	296	310
MAX	269	122	188	206	149	187	170	262	415	839	552	962
MIN	28	-66	-38	-39	-50	-71	-26	-96	-51	-33	39	42

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1997 - 2000, BY WATER YEAR (WY)
MEAN	270	60.6	53.4	62.9	55.2	59.4	87.2	105	303	455	416	379
MAX	490	71.8	68.4	79.5	63.8	95.5	107	150	435	559	567	451
(WY)	1997	1997	2000	1997	1998	1997	1998	1997	1997	1998	1998	1998
MIN	146	49.8	32.3	36.9	42.3	33.3	67.6	54.9	151	372	296	310
(WY)	2000	1999	1999	1999	1997	2000	2000	2000	2000	2000	2000	2000

SUMMARY STATISTICS	FOR 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1997 - 2000
ANNUAL TOTAL	60177.7		51134.17
ANNUAL MEAN	165		140		193
HIGHEST ANNUAL MEAN					238	1997
LOWEST ANNUAL MEAN					140	2000
HIGHEST DAILY MEAN	819	Jul 26	962	Sep 5	1069 A	Jun 21 1997
LOWEST DAILY MEAN	-66	Nov 28	-96	May 5	-769 B	Feb 21 1997
ANNUAL SEVEN-DAY MINIMUM	5.7	Nov 26	-21	May 2	-98 B	Feb 21 1997
10 PERCENT EXCEEDS	383		337		484
50 PERCENT EXCEEDS	78		96		97
90 PERCENT EXCEEDS	28		-4.1		32

	A - Estimated by regression.
	B - Due to regulation to prevent flooding.