05536358 DATA: Discharge Tables, 2001

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 2000 TO SEPTEMBER 2001 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	113	34	111	78	e29	e34	286	44	148	-13	104	321
2	109	169	94	11	e29	e65	166	72	-78	178	329	168
3	5.7	8.1	184	46	e39	e55	154	8.6	26	232	73	110
4	76	97	87	124	e80	e80	109	-36	64	708	187	229
5	-46	314	150	76	e80	e100	96	107	-132	435	289	259

6	-193	174	125	25	e39	e70	110	85	223	227	166	297
7	7.8	102	8.9	71	e60	e24	59	32	143	-40	159	150
8	185	-78	6.2	97	e75	56	-114	-36	-5.2	188	94	187
9	145	-156	98	44	e24	50	102	122	165	43	448	279
10	50	-26	86	40	e14	78	-52	117	144	443	181	229

11	80	108	126	58	e34	44	217	98	228	56	252	255
12	82	100	207	32	e85	-60	247	107	590	329	255	236
13	-5.8	195	-11	109	e60	1.4	147	-18	-67	67	216	272
14	211	-192	-49	34	e55	19	12	132	210	-171	283	326
15	152	151	397	13	e65	28	131	45	569	108	251	284

16	-44	336	-0.25	112	e55	-10	43	102	-12	147	168	283
17	-27	190	208	100	e24	39	78	0.82	157	77	281	229
18	198	63	264	-54	e44	112	55	115	542	-53	186	245
19	58	26	-13	163	e55	93	159	193	329	558	292	285
20	104	53	-203	87	e60	77	135	51	204	331	284	196

21	211	-41	-123	40	e96	125	286	-73	240	110	150	153
22	123	45	56	e44	e60	86	97	49	238	56	385	248
23	112	80	130	e55	e60	162	82	94	229	34	207	570
24	98	3.4	34	e101	e50	192	30	22	-157	57	409	64
25	164	122	-3.2	e39	e14	311	15	65	196	131	271	27

26	84	123	-36	e50	e19	126	54	157	340	119	303	236
27	-76	41	84	e75	e60	89	35	0.21	375	36	305	477
28	71	186	82	e70	e39	24	23	-24	279	-57	328	553
29	58	41	13	e75	---	92	-56	93	68	-115	323	474
30	131	161	22	e39	---	91	-14	56	47	176	88	243

31	77	---	-79	e39	---	84	---	21	---	130	766	---

TOTAL	2313.7	2429.5	2055.65	1893	1404	2337.4	2692	1801.63	5302.8	4527	8033	7885
MEAN	74.6	81.0	66.3	61.1	50.1	75.4	89.7	58.1	177	146	259	263
MAX	211	336	397	163	96	311	286	193	590	708	766	570
MIN	-193	-192	-203	-54	14	-60	-114	-73	-157	-171	73	27

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1997 - 2001, BY WATER YEAR (WY)
MEAN	231	64.6	56.0	62.5	54.2	62.6	87.7	95.9	278	393	385	356
MAX	490	81.0	68.4	79.5	63.8	95.5	107	150	435	559	567	451
(WY)	1997	2001	2000	1997	1998	1997	1998	1997	1997	1998	1998	1998
MIN	74.6	49.8	32.3	36.9	42.3	33.3	67.6	54.9	151	146	259	263
(WY)	2001	1999	1999	1999	1997	2000	2000	2000	2000	2001	2001	2001

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1997 - 2001
ANNUAL TOTAL	49764.32		42674.68
ANNUAL MEAN	136		117		178
HIGHEST ANNUAL MEAN					238	1997
LOWEST ANNUAL MEAN					117	2001
HIGHEST DAILY MEAN	962	Sep 5	766	Aug 31	1069 A	Jun 21 1997
LOWEST DAILY MEAN	-203	Dec 20	-203	Dec 20	-769 B	Feb 21 1997
ANNUAL SEVEN-DAY MINIMUM	-21	Dec 20	-21	Dec 20	-98 B	Feb 21 1997
10 PERCENT EXCEEDS	338		285		466
50 PERCENT EXCEEDS	98		87		94
90 PERCENT EXCEEDS	-24		-13		27

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