USGS CD-ROM: Current Year Discharge

05531500 SALT CREEK AT WESTERN SPRINGS, IL

LOCATION.--Lat 41°49'35", long 87°54'00", in NE¼SE¼ sec.31, T.39 N., R.12 E., Cook County, Hydrologic Unit 07120004, on left bank at upstream side of bridge on Wolf Road, in Cook County Forest Preserve, 0.5 mi north of Western Springs, and at mile 8.8.

DRAINAGE AREA.--115 mi².

PERIOD OF RECORD.--October 1945 to current year.

REVISED RECORDS.--WSP 1915: Drainage area. WRD IL-87-2: Drainage area. WRD IL-97-2: July 21 - Sept. 26, 1996.

GAGE.--Water-stage recorder. Datum of gage is 624.93 ft above sea level. Prior to July 26, 1946, nonrecording gage at same site and datum.

REMARKS.--Records good except those for estimated daily discharges, which are poor. Occasional regulation by sewage treatment plants upstream from station. Since May 28, 1996, some flow diverted during high-flow periods to Elmhurst Quarry Flood Control Reservoir 12.3 miles upstream from gage. Gage-height telemeter at station.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	58	83	146	89	210	132	552	e155	73	146	46	98
2	52	80	120	98	359	124	552	e140	69	111	43	78
3	55	74	112	157	362	121	359	e120	62	103	42	75
4	58	73	118	443	296	134	263	e130	84	476	316	82
5	56	66	108	616	233	129	194	e115	91	249	509	64

6	54	120	92	652	189	121	157	e130	62	e120	811	56
7	55	118	85	633	166	118	163	e740	65	e130	500	884
8	54	89	79	637	149	278	520	e1180	62	e140	373	443
9	63	87	73	622	140	690	751	e1200	192	e110	259	250
10	62	80	117	441	132	689	705	e820	181	e96	186	161

11	54	69	179	297	268	453	471	e540	365	e74	134	97
12	52	72	172	227	434	301	296	e400	400	e70	118	83
13	105	65	139	188	376	236	242	e280	281	62	100	72
14	118	65	117	153	277	210	269	247	235	58	81	76
15	89	92	105	152	217	194	226	202	162	60	69	261

16	75	104	99	143	191	236	e430	176	127	54	59	183
17	69	91	99	133	330	363	e440	157	145	53	60	147
18	63	87	97	126	427	863	e300	124	107	51	60	107
19	58	86	95	110	354	899	e230	135	372	126	55	79
20	59	80	97	108	273	780	e240	112	262	82	53	71

21	54	80	94	100	225	490	e370	101	172	69	55	74
22	60	78	94	103	187	356	e420	89	126	68	54	72
23	73	80	91	108	161	324	e380	98	99	61	100	63
24	76	75	93	109	157	252	e250	207	85	57	169	58
25	72	71	152	103	144	208	e200	127	73	50	531	62

26	99	72	157	105	133	179	e210	108	230	48	553	61
27	457	78	131	105	138	153	e210	83	196	48	358	57
28	349	130	116	117	134	167	e180	142	270	47	270	61
29	191	134	102	155	---	153	e220	107	296	46	255	65
30	124	147	101	182	---	139	e175	92	234	45	182	85

31	93	---	95	183	---	285	---	82	---	49	136	---

TOTAL	2957	2626	3475	7395	6662	9777	9975	8339	5178	2959	6537	4025
MEAN	95.4	87.5	112	239	238	315	333	269	173	95.5	211	134
MAX	457	147	179	652	434	899	751	1200	400	476	811	884
MIN	52	65	73	89	132	118	157	82	62	45	42	56
CFSM	.83	.76	.97	2.07	2.07	2.74	2.89	2.34	1.50	.83	1.83	1.17
IN.	.96	.85	1.12	2.39	2.16	3.16	3.23	2.70	1.67	.96	2.11	1.30

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1946 - 1998, BY WATER YEAR (WY)
MEAN	79.6	105	108	111	130	212	230	160	131	92.6	105	83.9
MAX	331	457	500	368	444	809	565	480	388	288	795	414
(WY)	1955	1986	1983	1993	1997	1979	1983	1996	1996	1978	1987	1972
MIN	3.34	5.55	8.14	5.79	12.4	46.1	41.8	24.8	25.6	10.6	3.08	3.33
(WY)	1949	1949	1954	1954	1954	1956	1946	1946	1956	1946	1948	1952

SUMMARY STATISTICS	FOR 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1946 - 1998
ANNUAL TOTAL	61359		69905
ANNUAL MEAN	168		192		129
HIGHEST ANNUAL MEAN					250	1993
LOWEST ANNUAL MEAN					36.6	1953
HIGHEST DAILY MEAN	1900	Feb 21	1200 A	May 9	3220	Aug 17 1987
LOWEST DAILY MEAN	49	Aug 3, Sep 13	42	Aug 3	1.0	Aug 27 1950
ANNUAL SEVEN-DAY MINIMUM	55	Sep 10	45	Jul 28	2.1	Oct 15 1948
INSTANTANEOUS PEAK FLOW			1470	Sep 7	3540	Aug 17 1987
INSTANTANEOUS PEAK STAGE			7.46 B	Sep 7	10.54	Aug 17 1987
INSTANTANEOUS LOW FLOW			.00 C	May 27	.00 C	May 27 1998
ANNUAL RUNOFF (CFSM)	1.46		1.67		1.12
ANNUAL RUNOFF (INCHES)	19.85		22.61		15.22
10 PERCENT EXCEEDS	310		432		295
50 PERCENT EXCEEDS	106		126		72
90 PERCENT EXCEEDS	58		60		15

A - Estimated.
B - May have been greater during period of no gage-height record, May 7-10.
C - Due to bridge construction.