05536358 DATA: Discharge Tables, 2003

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 2002 TO SEPTEMBER 2003 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	34	104	-43	17	10	74	19	215	-37	214	157	30
2	157	138	-40	95	53	45	-8.6	222	50	210	14	214
3	107	75	21	49	84	67	-0.04	150	182	109	71	69
4	31	73	96	52	-12	-3.4	10	221	-24	113	132	120
5	130	50	46	84	-42	86	73	211	-67	22	279	25

6	171	39	-35	-0.13	65	90	35	123	-60	-65	291	136
7	153	19	62	1.7	-0.83	-42	47	265	-58	92	378	66
8	126	-15	25	-40	27	117	39	291	80	91	179	-5.8
9	122	73	-40	38	35	e30	-9.6	149	-2.4	74	192	56
10	190	57	69	-17	27	e38	-56	80	166	28	391	101

11	120	-25	-53	-44	15	e31	45	304	18	47	242	213
12	119	46	58	48	-12	e33	14	340	80	139	298	85
13	149	68	70	16	57	e34	-4.3	286	118	204	360	253
14	93	25	89	128	50	e31	44	191	98	229	402	e144
15	156	-6.9	6.5	-18	68	e33	58	356	171	114	401	e220

16	141	18	71	44	96	e32	-9.3	204	60	114	470	e205
17	171	23	144	90	125	e31	14	95	-44	76	534	e218
18	117	24	294	8.6	-41	e34	34	162	6.3	215	436	e232
19	200	77	110	18	21	e61	9.9	346	40	210	432	e275
20	158	24	25	-20	11	e153	27	158	189	95	378	e228

21	143	-16	24	113	57	e30	71	116	238	145	348	e267
22	39	34	-11	42	152	e33	40	98	137	92	447	e211
23	51	16	55	e30	77	e35	-2.9	81	129	197	375	e148
24	42	-33	71	e28	43	e33	100	106	90	176	283	e146
25	-23	-59	38	e30	6.0	e32	94	137	25	136	327	e169

26	-19	12	3.2	e33	47	e31	0.45	60	109	103	213	e127
27	18	-7.8	30	e28	52	e107	56	52	62	93	286	e273
28	131	34	26	e29	98	e33	76	73	-51	111	179	e275
29	90	-83	81	28	---	e32	23	165	24	253	-12	e251
30	61	55	77	-17	---	e31	102	177	88	165	123	e132

31	67	---	42	5.4	---	e34	---	92	---	150	110	---

TOTAL	3245	838.3	1411.7	899.57	1168.17	1405.6	940.61	5526	1816.9	3952	8716	4883.2
MEAN	105	27.9	45.5	29.0	41.7	45.3	31.4	178	60.6	127	281	163
MAX	200	138	294	128	152	153	102	356	238	253	534	275
MIN	-23	-83	-53	-44	-42	-42	-56	52	-67	-65	-12	-5.8

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1997 - 2003, BY WATER YEAR (WY)
MEAN	197	55.7	49.6	47.7	43.8	52.0	66.7	95.6	217	334	370	302
MAX	490	81.0	68.4	79.5	63.8	95.5	107	178	435	559	567	451
(WY)	1997	2001	2000	1997	1998	1997	1998	2003	1997	1998	1998	1998
MIN	74.6	27.9	22.1	-7.60	-6.56	5.37	-2.78	11.6	60.6	127	259	163
(WY)	2001	2003	2002	2002	2002	2002	2002	2002	2003	2003	2001	2003

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR		FOR 2003 WATER YEAR		WATER YEARS 1997 - 2003
ANNUAL TOTAL	32460.60		34803.05
ANNUAL MEAN	88.9		95.4		153
HIGHEST ANNUAL MEAN					238	1997
LOWEST ANNUAL MEAN					88.8	2002
HIGHEST DAILY MEAN	774	Aug 23	534	Aug 17	1069 A	Jun 21 1997
LOWEST DAILY MEAN	-248	Jun 17	-83	Nov 29	-769 B	Feb 21 1997
ANNUAL SEVEN-DAY MINIMUM	-75	Apr 13	-17	Nov 23	-98 B	Feb 21 1997
10 PERCENT EXCEEDS	302		234		431
50 PERCENT EXCEEDS	46		70		83
90 PERCENT EXCEEDS	-51		-9.4		4.7

	A - Estimated due to regulation.
	B - Due to regulation to prevent flooding.