05536358 DATA: Discharge Tables, 1997

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.

EXTREMES FOR CURRENT YEAR.--Maximum daily discharge, 1,069 ft³/s (estimated), June 21, 1997; minimum 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 1996 TO SEPTEMBER 1997 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	698	-4.0	e59	e83	e68	e56	e84	e104	e495	e455	516	492
2	528	42	e44	e42	e53	e49	e65	e392	e395	e463	556	268
3	429	125	e59	e47	e55	e70	e65	e327	e464	e495	535	357
4	605	86	e69	e62	e62	e56	e96	e110	e473	e479	432	435
5	705	129	e64	e67	e55	e57	e87	e70	e389	e495	405	462

6	658	344	e61	e67	e62	e61	e50	e85	e124	e489	464	481
7	478	157	e56	e70	e61	e61	e50	e91	e131	e444	466	497
8	534	123	e56	e53	e61	e64	e61	e458	e351	e384	462	452
9	600	22	e57	e63	e54	e81	e73	e102	e468	e451	540	347
10	357	-43	e66	e83	e84	e61	e58	e133	e467	e451	468	318

11	564	36	e77	e123	e68	e81	e83	e122	e384	e490	339	347
12	622	-15	e84	e105	e70	e62	e318	e124	e416	e495	295	466
13	625	84	e66	e109	e68	e83	e50	e89	e472	e491	466	593
14	553	132	e60	e107	e62	e78	e54	e88	e485	e460	534	492
15	593	e65	e70	e65	e55	e82	e84	e111	e458	e457	658	531

16	486	e70	e56	e102	e65	e80	e83	e86	e352	e476	302	454
17	360	e56	e57	e112	e265	e71	e80	e105	e435	488	218	406
18	463	e57	e56	e83	47	e66	e73	e112	e449	466	212	423
19	488	e47	e46	e92	258	e66	e94	e425	e422	451	97	559
20	560	e67	e88	e63	265	e84	e114	e62	e385	583	41	455

21	406	e62	e45	e65	-769	e72	e67	e123	e1069	412	413	431
22	194	e42	e56	e67	-59	e86	e63	e193	e407	375	e481	248
23	251	e75	e35	e77	52	e66	e81	e160	e467	447	e448	286
24	459	e68	e22	e59	46	e371	e68	e159	e529	499	e449	480
25	662	e60	e57	e92	-46	e352	e112	e123	e356	567	e467	372

26	670	e57	e70	e90	e30	e60	e132	e132	e476	511	e465	467
27	477	e48	e76	e80	e57	e64	e100	e87	e475	582	500	564
28	360	e61	e43	e68	e36	e65	e85	e111	e487	464	520	497
29	233	e46	e55	e87	---	e308	e100	e88	e492	419	470	319
30	297	e56	e59	e99	---	e74	e85	e110	e289	480	519	291

31	288	---	e51	e81	---	e72	---	e174	---	467	488	---

TOTAL	15203	2155.0	1820	2463	1185	2959	2615	4656	13062	14686	13226	12790
MEAN	490	71.8	58.7	79.5	42.3	95.5	87.2	150	435	474	427	426
MAX	705	344	88	123	265	371	318	458	1070	583	658	593
MIN	194	-43	22	42	-769	49	50	62	124	375	41	248

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1997 - 1997, BY WATER YEAR (WY)
MEAN	490	71.8	58.7	79.5	42.3	95.5	87.2	150	435	474	427	426
MAX	490	71.8	58.7	79.5	42.3	95.5	87.2	150	435	474	427	426
(WY)	1997	1997	1997	1997	1997	1997	1997	1997	1997	1997	1997	1997
MIN	490	71.8	58.7	79.5	42.3	95.5	87.2	150	435	474	427	426
(WY)	1997	1997	1997	1997	1997	1997	1997	1997	1997	1997	1997	1997

SUMMARY STATISTICS	FOR 1997 WATER YEAR
ANNUAL TOTAL	86820.0
ANNUAL MEAN	238
HIGHEST DAILY MEAN	1069 A	Jun 21
LOWEST DAILY MEAN	-769 B	Feb 21
ANNUAL SEVEN-DAY MINIMUM	-98 B	Feb 21
10 PERCENT EXCEEDS	497
50 PERCENT EXCEEDS	112
90 PERCENT EXCEEDS	55

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