05536358 DATA: Discharge Tables, 1998

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 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	261	e67	e61	e32	e47	e59	e50	e87	338	e449	634	401
2	449	e96	e52	e41	e33	e44	e48	e107	239	e453	651	504
3	464	e63	e71	e36	e48	e42	e51	e82	245	e432	493	407
4	370	e53	e41	206	e45	e31	e56	e74	206	e407	218	521
5	411	e50	e46	117	e31	e46	e45	e81	308	e453	289	580

6	362	e70	e62	202	e43	e46	e48	172	303	e443	501	491
7	394	e102	e36	143	e46	e37	214	e46	412	e644	257	301
8	389	e93	e52	225	e51	92	130	e34	281	e441	458	382
9	320	e73	242	e39	e41	e51	274	e96	321	e429	548	329
10	302	e46	e46	e38	e46	e45	e87	e107	244	e520	454	400

11	510	e56	e39	e36	303	e32	e101	e92	e462	e583	499	457
12	502	e54	e59	e50	143	e53	e96	e105	e264	e553	642	474
13	297	e57	e48	e55	e41	e33	e55	e121	e335	e572	633	511
14	e72	e48	e35	e50	e58	e52	e97	e81	e292	e603	598	419
15	e103	e50	e40	e56	e52	e71	179	e112	e397	e603	692	450

16	e94	e42	e52	e37	222	e36	144	e136	e336	489	638	537
17	e101	e21	e42	e39	e43	e52	e62	e126	e329	648	478	411
18	e114	e50	e46	e43	e35	e39	e110	e334	e258	828	586	532
19	e122	e65	e48	e38	e43	e27	e125	e300	e493	676	603	488
20	e86	e64	e44	e49	e39	e30	204	e104	e356	595	638	504

21	e72	e50	e55	e44	e41	e43	e49	e108	e498	683	606	466
22	e72	e57	e48	e49	e62	e38	e58	e126	e310	588	633	407
23	e52	e66	e50	e44	e40	e48	e45	e138	e326	610	709	446
24	e78	e52	e51	e46	e45	e37	e134	301	e331	660	674	370
25	e73	e256	e29	e56	e48	e48	234	e129	e407	610	965	458

26	89	e42	e46	e40	e44	e34	236	e304	e295	644	665	461
27	e61	e43	e41	e43	e49	e46	e72	e109	e390	479	661	525
28	e60	e41	e45	e25	e46	e351	e90	e91	e575	529	382	496
29	e72	e33	e56	e44	---	e90	e66	312	e494	519	549	478
30	e93	227	e50	e51	---	e39	e61	e132	e442	589	622	321

31	e50	---	e42	e47	---	267	---	e161	---	584	586	---

TOTAL	6495	2087	1675	2021	1785	1959	3221	4308	10487	17316	17562	13527
MEAN	210	69.6	54.0	65.2	63.8	63.2	107	139	350	559	567	451
MAX	510	256	242	225	303	351	274	334	575	828	965	580
MIN	50	21	29	25	31	27	45	34	206	407	218	301

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1997 - 1998, BY WATER YEAR (WY)
MEAN	350	70.7	56.4	72.3	53.0	79.3	97.3	145	392	516	497	439
MAX	490	71.8	58.7	79.5	63.8	95.5	107	150	435	559	567	451
(WY)	1997	1997	1997	1997	1998	1997	1998	1997	1997	1998	1998	1998
MIN	210	69.6	54.0	65.2	42.3	63.2	87.2	139	350	474	427	426
(WY)	1998	1998	1998	1998	1997	1998	1997	1998	1998	1997	1997	1997

SUMMARY STATISTICS	FOR 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1997 - 1998
ANNUAL TOTAL	77899		82443
ANNUAL MEAN	213		226		232
HIGHEST ANNUAL MEAN					238	1997
LOWEST ANNUAL MEAN					226	1998
HIGHEST DAILY MEAN	1069 A	Jun 21	965	Aug 25	1069 A	Jun 21 1997
LOWEST DAILY MEAN	-769 B	Feb 21	21 A	Nov 17	-769 B	Feb 21 1997
ANNUAL SEVEN-DAY MINIMUM	-98 B	Feb 21	37 A	Mar 18	-98 B	Feb 21 1997
10 PERCENT EXCEEDS	487		577		528
50 PERCENT EXCEEDS	97		103		109
90 PERCENT EXCEEDS	49		41		44

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