05536000 DATA: Discharge Tables, 2002

Station list Available data
ILLINOIS RIVER BASIN

05536000 NORTH BRANCH CHICAGO RIVER AT NILES, IL


LOCATION.-- Lat 42°00'44", long 87°47'44" (NAD of 1927), in SW1/4SE1/4 sec.30, T.41 N., R.13 E., Cook County, Hydrologic Unit 07120003, on right bank at downstream side of bridge on Touhy Avenue in Niles, 3.6 mi downstream from West Fork of North Branch, 7.9 mi upstream from North Shore Channel, and at mile 51.4.

DRAINAGE AREA.-- 100 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1950 to current year. Prior to October 1952, records published with those for streams in the St. Lawrence River basin (WSP 1207, 1237).
	STAGE: Water years 1994-2002.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978 to 1991. Additional chemical data for water years 1972-77 are published in Water-Resources Investigations 78-22 and 79-23 as site HCC 07.
	SEDIMENT: October 1984 to September 1986.

REVISED RECORDS.-- WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 601.99 ft above NGVD of 1929.

REMARKS.-- Diurnal fluctuation at low flow caused by sewage-treatment plants.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 2,590 ft³/s, Aug. 14, 1987, gage height, 11.35 ft; minimum daily discharge, .10 ft³/s, Sept. 30, 1953.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 285 mg/L July 15, 1985; minimum daily mean, 2 mg/L Jan. 23 to Feb. 21, 1985, and Jan. 30-31, 1986.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 566 tons July 8, 1986; minimum daily, 0.14 ton Jan. 29, Jan. 31 to Feb. 4, Feb. 6-11, 15-19, 1985.

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

DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	98	249	121	e42	91	79	100	90	44	23	20	115
2	79	138	81	41	90	91	117	535	41	22	25	231
3	54	126	73	e39	75	119	101	338	60	21	16	331
4	70	106	53	e37	68	105	95	191	715	22	28	138
5	222	87	45	e36	62	93	83	115	831	17	55	113

6	94	100	42	e35	60	96	81	106	516	26	21	77
7	60	79	38	35	64	123	98	98	339	24	15	50
8	49	64	33	36	72	356	237	109	263	18	16	40
9	44	51	27	36	87	664	629	177	231	159	15	35
10	48	45	24	37	176	504	495	113	241	58	14	37

11	57	40	24	36	186	292	341	279	259	39	18	32
12	336	37	27	36	144	228	234	1150	222	31	13	27
13	787	34	144	35	125	195	185	725	154	22	163	26
14	1550	34	119	36	107	159	152	391	204	17	448	24
15	1150	34	103	39	99	144	127	295	214	18	205	22

16	840	32	87	40	96	113	107	437	152	19	94	20
17	558	30	107	43	85	97	112	604	130	19	60	22
18	528	29	96	41	77	95	96	331	92	17	36	55
19	477	32	94	39	109	84	91	230	61	18	59	40
20	501	29	97	35	257	79	98	181	61	17	56	173

21	464	25	98	35	283	70	127	131	52	16	34	143
22	362	23	75	36	215	66	147	115	42	16	1540	132
23	906	20	78	38	166	60	97	89	33	18	1140	97
24	1100	27	71	40	137	56	98	74	31	16	589	56
25	1040	58	63	40	119	53	97	71	28	17	317	43

26	743	39	61	41	107	59	77	71	32	16	263	38
27	547	34	56	38	99	51	107	59	29	42	415	32
28	479	30	52	38	85	48	181	54	27	28	311	28
29	500	46	48	43	---	120	119	55	27	25	216	102
30	479	134	e45	44	---	166	100	52	24	22	121	85

31	407	---	e44	54	---	105	---	48	---	17	169	---

TOTAL	14629	1812	2126	1201	3341	4570	4729	7314	5155	840	6492	2364
MEAN	471.9	60.40	68.58	38.74	119.3	147.4	157.6	235.9	171.8	27.10	209.4	78.80
MAX	1550	249	144	54	283	664	629	1150	831	159	1540	331
MIN	44	20	24	35	60	48	77	48	24	16	13	20
CFSM	4.72	0.60	0.69	0.39	1.19	1.47	1.58	2.36	1.72	0.27	2.09	0.79
IN.	5.44	0.67	0.79	0.45	1.24	1.70	1.76	2.72	1.92	0.31	2.42	0.88

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2002, BY WATER YEAR (WY)
MEAN	69.33	79.79	82.27	77.98	108.6	169.3	191.1	128.5	107.3	79.52	80.48	71.14
MAX	472	349	381	239	358	582	496	445	339	290	401	315
(WY)	2002	1986	1983	1974	1997	1979	1999	1996	1996	1982	1987	1972
MIN	2.83	5.53	6.56	5.51	4.87	28.6	50.0	24.9	19.0	9.46	6.15	4.54
(WY)	1953	1954	1951	1963	1963	1968	1986	1952	1963	1956	1955	1953

SUMMARY STATISTICS	FOR 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1951 - 2002
ANNUAL TOTAL	62400.6		54573
ANNUAL MEAN	171.0		149.5		103.6
HIGHEST ANNUAL MEAN					171	1993
LOWEST ANNUAL MEAN					28.0	1963
HIGHEST DAILY MEAN	1550	Oct 14	1550	Oct 14	2030	Aug 15 1987
LOWEST DAILY MEAN	4.6	Jul 6	13	Aug 12	0.10	Sep 30 1953
ANNUAL SEVEN-DAY MINIMUM	6.8	Jun 30	16	Aug 6	1.3	Oct 9 1952
MAXIMUM PEAK FLOW			1940	Aug 22	2590	Aug 14 1987
MAXIMUM PEAK STAGE			9.86	Aug 22	11.35	Aug 14 1987
INSTANTANEOUS LOW FLOW			9.2	Jul 25
ANNUAL RUNOFF (CFSM)	1.71		1.50		1.04
ANNUAL RUNOFF (INCHES)	23.21		20.30		14.08
10 PERCENT EXCEEDS	469		374		250
50 PERCENT EXCEEDS	84		77		49
90 PERCENT EXCEEDS	26		24		13