05531500 DATA: Discharge Tables, 2002

Station list Available data
ILLINOIS RIVER BASIN

05531500 SALT CREEK AT WESTERN SPRINGS, IL


LOCATION.-- Lat 41°49'33", long 87°54'02" (NAD of 1927), in NE1/4SE1/4 sec.31, T.39 N., R.12 E., Cook County, Hydrologic Unit 07120004, on left pier 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.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1945 to current year.
	STAGE: Water years 1994-2002.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978-91 and 1999 to current.
	MISCELLANEOUS: Contaminants in streambed sediments, August 1998; contaminants in fish tissue, August 1998.
BIOLOGICAL
	BENTHIC MACROINVERTEBRATES: Water year 1999.
	FISH: Water years 1999, 2000, and 2002.
	HABITAT: Water years 1999, and 2002.

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, phone telemeter, crest-stage gage, and water-quality monitor. Datum of gage is 624.93 ft above NGVD of 1929. Prior to July 26, 1946, nonrecording gage at same site and datum.

REMARKS.-- Occasional regulation by sewage treatment plants upstream from station. Since May 28, 1996, some flow temporarily diverted for flood control to Elmhurst Quarry Flood Control Reservoir 12.3 miles upstream from gage.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 3,540 ft³/s, Aug. 17, 1987, gage height, 10.54 ft; minimum, no flow, May 27, 1998, due to bridge construction.

REMARKS FOR CURRENT YEAR.-- Records fair 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	193	276	278	e77	131	119	161	177	90	68	102	132
2	181	248	224	e75	131	130	202	280	90	79	108	225
3	157	216	174	79	120	162	179	443	84	76	90	279
4	177	193	145	78	114	159	158	326	582	84	90	255
5	527	175	128	74	103	142	160	219	1010	54	174	194

6	330	166	122	76	95	145	121	188	1090	66	135	168
7	242	161	113	78	97	199	149	167	766	67	108	149
8	194	153	106	e76	106	433	343	146	433	81	97	139
9	137	148	99	75	129	756	769	198	296	509	86	134
10	107	143	95	76	223	790	709	187	301	316	85	132

11	124	138	92	81	249	566	505	365	350	197	81	127
12	247	136	92	74	217	371	329	1120	295	145	82	122
13	733	133	169	75	182	300	246	1120	234	111	162	118
14	1760	150	186	77	152	241	199	848	262	104	550	114
15	1520	142	170	76	137	197	173	448	228	111	509	76

16	1190	139	149	78	127	163	160	415	179	114	257	73
17	840	132	162	84	121	141	217	611	146	82	169	72
18	520	128	149	90	114	131	194	561	127	91	137	102
19	380	146	148	87	145	120	165	392	104	82	134	107
20	330	136	145	85	306	121	262	300	102	92	162	178

21	294	121	137	86	422	114	245	250	89	85	177	202
22	262	92	126	88	359	114	295	209	96	92	1010	184
23	619	88	138	91	260	105	257	181	83	83	1380	190
24	940	102	135	94	205	100	227	170	85	89	1220	148
25	1100	162	120	95	165	98	258	178	105	81	890	117

26	882	172	108	92	151	97	188	157	94	95	486	97
27	602	190	103	90	140	95	214	145	82	110	331	88
28	411	164	100	90	126	90	379	122	82	118	263	87
29	344	177	93	90	---	162	299	121	69	125	215	e90
30	326	246	91	90	---	244	233	110	74	122	188	98

31	306	---	e82	107	---	201	---	106	---	104	161	---

TOTAL	15975	4773	4179	2584	4827	6806	7996	10260	7628	3633	9639	4197
MEAN	515.3	159.1	134.8	83.35	172.4	219.5	266.5	331.0	254.3	117.2	310.9	139.9
MAX	1760	276	278	107	422	790	769	1120	1090	509	1380	279
MIN	107	88	82	74	95	90	121	106	69	54	81	72
CFSM	4.48	1.38	1.17	0.72	1.50	1.91	2.32	2.88	2.21	1.02	2.70	1.22
IN.	5.17	1.54	1.35	0.84	1.56	2.20	2.59	3.32	2.47	1.18	3.12	1.36

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1946 - 2002, BY WATER YEAR (WY)
MEAN	92.38	108.3	108.4	113.6	137.1	209.9	236.2	167.3	138.7	94.62	109.7	92.12
MAX	515	457	500	368	444	809	565	480	388	288	795	414
(WY)	2002	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 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1946 - 2002
ANNUAL TOTAL	81470		82497
ANNUAL MEAN	223.2		226.0		133.9
HIGHEST ANNUAL MEAN					250	1993
LOWEST ANNUAL MEAN					36.6	1953
HIGHEST DAILY MEAN	1760	Oct 14	1760	Oct 14	3220	Aug 17 1987
LOWEST DAILY MEAN	41	Jul 15	54 A	Jul 5	1.0	Aug 27 1950
ANNUAL SEVEN-DAY MINIMUM	47	Jul 11	71	Jul 1	2.1	Oct 15 1948
MAXIMUM PEAK FLOW			2080	Oct 14	3540	Aug 17 1987
MAXIMUM PEAK STAGE			8.81	Oct 14	10.54	Aug 17 1987
INSTANTANEOUS LOW FLOW			16 A	Jul 5	0.00 B	May 27 1998
ANNUAL RUNOFF (CFSM)	1.94		1.97		1.16
ANNUAL RUNOFF (INCHES)	26.35		26.69		15.82
10 PERCENT EXCEEDS	433		445		303
50 PERCENT EXCEEDS	148		146		76
90 PERCENT EXCEEDS	71		83		16

	A-Result of regulation.
	B-Due to bridge construction.