05536000 DATA: Discharge Tables, 2003

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 to current year.
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, 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	56	23	29	28	e29	23	63	1040	143	31	54	53
2	86	23	30	25	e31	22	56	882	105	28	80	36
3	70	23	32	27	32	22	62	596	103	28	198	26
4	179	21	31	26	33	26	380	421	79	26	99	23
5	202	25	31	26	29	25	589	832	65	134	53	22

6	84	30	29	27	26	27	311	694	73	176	44	22
7	64	27	28	28	26	28	222	457	56	454	41	20
8	57	23	26	29	e25	30	227	261	95	337	43	19
9	54	25	25	28	e24	28	205	852	109	311	49	20
10	56	29	46	27	23	26	248	680	70	248	33	21

11	50	25	35	25	e23	29	183	706	56	173	29	21
12	38	37	30	33	e23	34	137	724	50	135	28	21
13	33	30	25	23	e23	52	106	521	48	91	24	27
14	30	29	25	24	e24	60	91	406	45	74	24	85
15	34	34	25	29	e24	88	80	431	41	338	24	107

16	37	32	24	27	24	100	69	277	38	229	25	54
17	28	32	24	27	e24	88	60	210	38	188	24	40
18	32	34	168	29	e24	75	55	176	68	266	21	31
19	26	57	198	29	e24	67	50	148	82	128	22	25
20	21	51	111	e28	24	86	50	134	68	104	22	23

21	20	57	75	e27	24	106	46	128	53	186	22	19
22	21	66	55	e27	24	90	44	106	45	94	20	42
23	20	49	43	e28	21	75	38	93	45	85	20	37
24	23	41	38	e30	22	67	33	81	48	69	18	27
25	43	35	35	e29	e22	84	36	69	44	59	19	23

26	44	35	32	e28	e23	81	33	61	39	51	25	49
27	31	35	30	e27	e23	69	32	57	30	43	24	81
28	27	34	28	e26	23	103	31	122	29	40	21	45
29	26	33	26	e26	---	130	32	291	33	38	21	33
30	25	34	28	e27	---	84	165	160	34	35	21	30

31	25	---	29	e28	---	69	---	175	---	29	21	---

TOTAL	1542	1029	1391	848	697	1894	3734	11791	1832	4228	1169	1082
MEAN	49.7	34.3	44.9	27.4	24.9	61.1	124	380	61.1	136	37.7	36.1
MAX	202	66	198	33	33	130	589	1040	143	454	198	107
MIN	20	21	24	23	21	22	31	57	29	26	18	19
CFSM	0.50	0.34	0.45	0.27	0.25	0.61	1.24	3.80	0.61	1.36	0.38	0.36
IN.	0.57	0.38	0.52	0.32	0.26	0.70	1.39	4.39	0.68	1.57	0.43	0.40

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2003, BY WATER YEAR (WY)
MEAN	69.0	78.9	81.6	77.0	107	167	190	133	106	80.6	79.7	70.5
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 2002 CALENDAR YEAR		FOR 2003 WATER YEAR		WATER YEARS 1951 - 2003
ANNUAL TOTAL	39968		31237
ANNUAL MEAN	110		85.6		103
HIGHEST ANNUAL MEAN					171	1993
LOWEST ANNUAL MEAN					28.0	1963
HIGHEST DAILY MEAN	1540	Aug 22	1040	May 1	2030	Aug 15 1987
LOWEST DAILY MEAN	13	Aug 12	18	Aug 24	0.10	Sep 30 1953
ANNUAL SEVEN-DAY MINIMUM	16	Aug 6	20	Aug 19	1.3	Oct 9 1952
MAXIMUM PEAK FLOW			1130	May 1	2590	Aug 14 1987
MAXIMUM PEAK STAGE			7.59	May 1	11.35	Aug 14 1987
INSTANTANEOUS LOW FLOW			15	Aug 24,25
ANNUAL RUNOFF (CFSM)	1.10		0.86		1.03
ANNUAL RUNOFF (INCHES)	14.87		11.62		14.04
10 PERCENT EXCEEDS	235		187		248
50 PERCENT EXCEEDS	55		34		48
90 PERCENT EXCEEDS	22		23		13