USGS CD-ROM: Current Year Discharge

05594450 SILVER CREEK NEAR TROY, IL

LOCATION.--Lat 38°43'00", long 89°49'45", in SE¼SW¼ sec.12, T.3 N., R.7 W., Madison County, Hydrologic Unit 07140204, on right bank at upstream side of bridge on U.S. Highway 40, 0.2 mi upstream from railroad bridge, 1.9 mi upstream from East Fork Silver Creek, 1.9 mi southeast of Troy, and at mile 44.6.

DRAINAGE AREA.--154 mi².

PERIOD OF RECORD.--October 1966 to current year.

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

GAGE.--Water-stage recorder. Datum of gage is 438.91 ft above sea level.

REMARKS.--Records fair except those for estimated daily discharges, which are poor. 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	1.0	3.8	3.9	e6.2	29	87	259	147	15	117	922	18
2	1.2	3.8	3.4	e6.0	24	53	182	85	12	48	309	e50
3	1.2	2.7	4.7	e7.0	20	44	154	111	9.6	26	91	e90
4	1.2	2.9	5.2	e9.0	18	39	492	387	241	29	52	e50
5	1.2	5.1	e4.0	e13	17	37	436	172	824	33	1650	28

6	1.1	12	e3.3	e25	16	35	172	75	694	24	1590	19
7	1.2	3.6	e2.9	78	15	34	108	71	230	226	906	14
8	1.1	2.1	e2.5	378	14	362	83	85	225	559	340	11
9	.99	2.6	e2.3	480	13	649	66	74	567	170	151	9.5
10	.88	3.2	e4.0	423	13	907	55	46	605	44	81	8.2

11	.80	2.9	e4.0	135	26	727	48	34	544	139	183	7.6
12	.75	2.5	e3.7	65	55	208	43	29	739	228	450	7.3
13	.89	2.6	e3.5	46	78	101	67	24	1000	48	309	7.2
14	1.4	3.1	e3.5	38	50	81	243	21	1140	26	92	7.6
15	1.4	3.4	e3.6	53	34	66	656	18	1000	19	48	7.8

16	1.4	2.9	e3.4	45	39	57	1970	17	1040	17	33	8.0
17	1.3	2.7	e3.0	40	283	139	1510	14	809	13	45	8.4
18	1.4	2.5	e2.7	32	614	731	801	13	267	11	286	e12
19	1.5	2.6	e2.5	26	633	954	238	11	100	10	683	e20
20	1.5	3.0	e2.3	25	477	2120	102	9.2	64	8.5	551	e13

21	1.5	2.9	e2.2	22	177	2600	77	64	1030	9.6	177	9.1
22	1.5	3.2	e5.0	22	109	1850	66	566	1550	19	59	7.3
23	1.5	3.1	e4.0	22	77	969	56	836	1430	378	36	e5.3
24	5.5	2.9	e36	22	60	319	48	1060	509	94	28	4.4
25	2.8	2.7	111	21	51	137	39	449	137	32	23	21

26	6.2	2.7	119	23	51	99	35	175	66	17	19	25
27	4.6	2.5	e35	32	124	94	35	91	49	16	17	62
28	3.4	2.6	e15	45	224	516	39	58	39	15	16	24
29	2.7	2.9	e10	54	---	817	137	44	33	15	16	13
30	2.5	4.6	e7.5	45	---	1100	218	33	61	915	14	7.7

31	2.2	---	e5.5	35	---	447	---	23	---	1230	14	---

TOTAL	57.81	100.1	418.6	2273.2	3341	16379	8435	4842.2	15029.6	4536.1	9191	575.4
MEAN	1.86	3.34	13.5	73.3	119	528	281	156	501	146	296	19.2
MAX	6.2	12	119	480	633	2600	1970	1060	1550	1230	1650	90
MIN	.75	2.1	2.2	6.0	13	34	35	9.2	9.6	8.5	14	4.4
CFSM	.01	.02	.09	.48	.77	3.43	1.83	1.01	3.25	.95	1.93	.12
IN.	.01	.02	.10	.55	.81	3.96	2.04	1.17	3.63	1.10	2.22	.14

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1967 - 1998, BY WATER YEAR (WY)
MEAN	24.5	88.0	173	144	201	238	250	150	98.5	64.7	26.7	24.8
MAX	165	509	902	562	646	927	738	827	501	570	296	408
(WY)	1987	1985	1983	1974	1982	1978	1994	1995	1998	1969	1998	1993
MIN	.23	.34	.42	.31	9.25	6.74	16.7	5.26	.91	1.44	.75	.093
(WY)	1972	1972	1977	1977	1978	1981	1986	1977	1988	1984	1971	1988

SUMMARY STATISTICS	FOR 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1967 - 1998
ANNUAL TOTAL	29687.82		65179.01
ANNUAL MEAN	81.3		179		123
HIGHEST ANNUAL MEAN					244	1983
LOWEST ANNUAL MEAN					23.1	1980
HIGHEST DAILY MEAN	2650	Feb 28	2600	Mar 21	7740	Apr 12 1979
LOWEST DAILY MEAN	.45 A	Aug 8	.75	Oct 12	.00	B
ANNUAL SEVEN-DAY MINIMUM	.52	Aug 3	.94	Oct 7	.00	Sep 29 1968
INSTANTANEOUS PEAK FLOW			2730	Mar 21	10600 C	Apr 12 1979
INSTANTANEOUS PEAK STAGE			14.72	Mar 21	17.94	May 17 1990
INSTANTANEOUS LOW FLOW			.70	Oct 12
ANNUAL RUNOFF (CFSM)	.53		1.16		.80
ANNUAL RUNOFF (INCHES)	7.17		15.74		10.86
10 PERCENT EXCEEDS	175		622		300
50 PERCENT EXCEEDS	10		33		15
90 PERCENT EXCEEDS	1.2		2.6		.71

A - Estimated, may have been less during periods of estimated discharges in July, Aug. and Sept.
B - Several days in 1967-68, 1973, 1988.
C - Gage height, 17.52 ft.