05536000 DATA: Discharge Tables, 1999

Station list Available data
ILLINOIS RIVER BASIN

05536000 NORTH BRANCH CHICAGO RIVER AT NILES, IL

LOCATION.--Lat 42°00'44", long 87°47'45", 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.--October 1950 to current year. Prior to October 1952, records published with those for streams in the St. Lawrence River basin (WSP 1207, 1237).

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

GAGE.--Water-stage recorder. Datum of gage is 601.99 ft above sea level.

REMARKS.--Records good except those for estimated daily discharges, which are poor. Diurnal fluctuation at low flow caused by sewage-treatment plants. Gage-height telemeter at station.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	35	91	64	e22	275	151	39	518	162	107	21	25
2	40	73	45	e23	339	141	38	352	513	49	20	23
3	64	64	39	e23	388	174	37	244	324	38	20	22
4	38	72	37	e22	339	140	42	161	172	32	20	21
5	128	78	35	e22	286	115	41	129	129	23	19	19

6	155	58	104	e21	304	129	61	165	98	23	17	18
7	97	48	343	e20	258	137	57	147	115	30	15	18
8	63	47	172	e20	219	126	78	103	118	25	17	20
9	47	48	115	e20	202	123	910	77	79	84	16	20
10	37	482	91	e20	195	137	824	64	62	43	18	21

11	31	539	75	e21	210	165	614	75	125	30	18	19
12	28	265	63	e21	279	176	420	427	188	21	45	27
13	27	160	52	e21	221	174	242	267	466	20	52	42
14	25	125	46	e21	171	169	194	135	994	15	30	33
15	23	98	42	e25	149	184	222	93	746	24	24	27

16	23	75	38	e40	135	257	766	73	545	24	21	24
17	313	63	e37	68	135	437	728	178	389	32	21	28
18	849	58	e36	103	117	496	519	171	221	25	20	25
19	657	51	35	58	98	303	307	127	164	21	345	24
20	291	46	32	47	86	205	249	93	102	23	193	31

21	158	42	29	64	78	155	294	94	69	100	75	77
22	113	37	28	718	70	124	907	120	64	67	46	53
23	83	35	e27	1080	70	108	1620	103	60	55	48	36
24	56	33	e25	1070	65	90	1150	86	61	198	102	30
25	44	34	e24	830	72	76	931	75	53	70	237	25

26	39	35	e23	593	86	65	694	62	43	45	137	24
27	64	32	e22.5	561	222	55	641	53	41	37	63	59
28	100	31	e22	565	192	51	887	48	44	30	40	415
29	77	30	e22	438	---	45	721	39	49	26	36	541
30	147	60	e22	357	---	43	645	35	36	26	31	247

31	105	---	e22	317	---	40	---	84	---	24	28	---

TOTAL	3957	2910	1767.5	7231	5261	4791	14878	4398	6232	1367	1795	1994
MEAN	128	97.0	57.0	233	188	155	496	142	208	44.1	57.9	66.5
MAX	849	539	343	1080	388	496	1620	518	994	198	345	541
MIN	23	30	22	20	65	40	37	35	36	15	15	18
CFSM	1.28	.97	.57	2.33	1.88	1.55	4.96	1.42	2.08	.44	.58	.66
IN.	1.47	1.08	.66	2.69	1.96	1.78	5.53	1.64	2.32	.51	.67	.74

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 1999, BY WATER YEAR (WY)
MEAN	61.6	81.0	83.7	79.6	105	173	192	124	104	79.7	75.3	66.4
MAX	293	349	381	239	358	582	496	445	339	290	401	315
(WY)	1987	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 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1951 - 1999
ANNUAL TOTAL	50564.5		56581.5
ANNUAL MEAN	139		155		102
HIGHEST ANNUAL MEAN					171	1993
LOWEST ANNUAL MEAN					28.0	1963
HIGHEST DAILY MEAN	937	May 8	1620	Apr 23	2030	Aug 15 1987
LOWEST DAILY MEAN	18	Aug 20,Sep 6	15	Jul 14,Aug 7	.10	Sep 30 1953
ANNUAL SEVEN-DAY MINIMUM	21	Aug 15	17	Aug 5	1.3	Oct 9 1952
INSTANTANEOUS PEAK FLOW			1800	Apr 23	2590	Aug 14 1987
INSTANTANEOUS PEAK STAGE			9.51	Apr 23	11.35	Aug 14 1987
INSTANTANEOUS LOW FLOW			8.0	Oct 17
ANNUAL RUNOFF (CFSM)	1.39		1.55		1.02
ANNUAL RUNOFF (INCHES)	18.81		21.05		13.86
10 PERCENT EXCEEDS	345		431		244
50 PERCENT EXCEEDS	73		64		48
90 PERCENT EXCEEDS	26		22		12