05569500 DATA: Discharge Tables, 1998

Station list Available data
ILLINOIS RIVER BASIN

05569500 SPOON RIVER AT LONDON MILLS, IL

LOCATION.--Lat 40°42'32", long 90°16'53", in SW1/4NE1/4 sec.4, T.8 N., R.2 E., Fulton County, Hydrologic Unit 07130005, on left bank at downstream side of bridge on State Highway 116, 0.2 mi downstream from a railroad bridge, 0.5 mi west of London Mills, 0.5 mi upstream from Cedar Creek, 4.0 mi downstream from Littlers Creek, and at mile 69.2.

DRAINAGE AREA.--1,072 mi². Area at site used prior to April 26, 1984, 1,062 mi².

PERIOD OF RECORD.--October 1942 to current year.

REVISED RECORDS.--WSP 1175: 1947. WDR IL-84-2: 1948(M), 1950(M), 1951, 1954(M), 1955, 1958, 1960, 1962, 1964, 1965, 1970, and drainage area.

GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 508.97 ft above sea level. Prior to July 13, 1945, nonrecording gage at same site and datum. July 14, 1945, to Apr. 26, 1984, at site 0.9 mi upstream at same datum.

REMARKS.--Records good except those for Mar. 8 - Aug. 11, which are fair, and those for estimated daily discharges, which are poor. U.S. Army Corps of Engineers satellite telemeter at station.

EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Aug. 26, 1924, reached a stage of 27.08 ft, from information by local residents.

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	199	578	1390	563	1480	2200	2810	1300	859	1780	256	158
2	191	536	1200	628	2370	1850	2440	1500	797	1360	240	146
3	192	500	1070	1000	2650	1660	2030	1400	761	1150	227	138
4	192	469	1030	e1800	2350	1530	1810	1290	771	1060	324	130
5	189	426	952	e4000	2050	1390	1640	1180	736	991	1030	122

6	182	650	845	e4150	1790	1280	1530	1160	706	949	519	117
7	174	1020	772	e4500	1590	1220	1490	1590	668	1150	394	112
8	171	1090	729	e4800	1470	2060	2070	4660	654	1220	742	107
9	175	973	704	e4200	1370	5490	3460	4670	1350	1040	541	103
10	174	853	710	e3600	1300	4520	3700	2630	1960	992	435	99

11	173	753	702	2930	2170	3180	2970	2050	1600	885	349	98
12	170	672	646	2510	5360	2490	2340	1780	2590	776	275	96
13	174	624	588	2210	4750	2210	2060	1600	3200	713	237	95
14	180	597	549	e1900	3170	2190	2140	1420	2370	662	216	120
15	173	614	541	e1800	2350	2060	2140	1310	4270	620	204	215

16	165	591	552	e1900	2040	1880	2140	1420	5530	577	194	233
17	157	533	543	e1600	1910	3360	2090	1280	5810	538	184	198
18	157	507	544	e1480	1820	7960	1850	1150	4160	504	325	155
19	156	499	535	e1330	1700	8090	1680	1090	3660	482	716	134
20	159	490	536	1240	1570	7340	1580	1270	3290	460	436	123

21	157	477	527	1270	1470	6120	1530	1120	2780	428	287	118
22	159	456	539	1190	1400	3270	1500	1090	2270	402	233	114
23	158	429	574	1140	1340	2480	1450	1160	2020	616	207	115
24	187	404	584	1100	1280	2160	1360	1680	1750	779	190	139
25	275	392	644	1050	1220	1970	1280	1750	1570	509	178	156

26	280	395	689	1000	1180	1850	1250	1430	1430	427	167	143
27	345	399	662	956	2370	1730	1170	1200	1300	388	158	123
28	528	556	628	929	2850	1640	1060	1090	1210	361	155	116
29	600	1310	710	1010	---	1580	1080	1060	1150	334	161	113
30	596	1520	663	1220	---	1490	1100	985	1380	303	176	110

31	612	---	632	1260	---	1730	---	925	---	277	182	---

TOTAL	7400	19313	21990	60266	58370	89980	56750	49240	62602	22733	9938	3946
MEAN	239	644	709	1944	2085	2903	1892	1588	2087	733	321	132
MAX	612	1520	1390	4800	5360	8090	3700	4670	5810	1780	1030	233
MIN	156	392	527	563	1180	1220	1060	925	654	277	155	95
CFSM	.22	.60	.66	1.81	1.94	2.71	1.76	1.48	1.95	.68	.30	.12
IN.	.26	.67	.76	2.09	2.03	3.12	1.97	1.71	2.17	.79	.34	.14

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 1998, BY WATER YEAR (WY)
MEAN	299	392	467	661	932	1213	1319	1212	1096	731	337	361
MAX	3647	2196	3090	3262	3185	4185	3905	4793	6036	4654	2989	3715
(WY)	1987	1986	1983	1974	1949	1979	1983	1995	1974	1993	1993	1970
MIN	15.1	23.0	14.3	11.3	35.4	132	71.2	94.3	80.8	30.2	11.1	10.4
(WY)	1964	1950	1964	1977	1989	1956	1956	1989	1963	1988	1989	1988

SUMMARY STATISTICS	FOR 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1943 - 1998
ANNUAL TOTAL	265471		462528
ANNUAL MEAN	727		1267		750
HIGHEST ANNUAL MEAN					2205	1993
LOWEST ANNUAL MEAN					150	1989
HIGHEST DAILY MEAN	11300	Feb 22	8090	Mar 19	35100	Jun 23 1974
LOWEST DAILY MEAN	29 A	Jan 19	95	Sep 13	3.0	Sep 15 1988
ANNUAL SEVEN-DAY MINIMUM	32	Jan 15	101	Sep 7	3.3	Sep 12 1988
INSTANTANEOUS PEAK FLOW			8560	Mar 18	41000	Jun 23 1974
INSTANTANEOUS PEAK STAGE			19.29	Mar 18	28.03 B	Jun 23 1974
INSTANTANEOUS LOW FLOW			94	Sep 13	2.6	Sep 16 1988
ANNUAL RUNOFF (CFSM)	.68		1.18		.70
ANNUAL RUNOFF (INCHES)	9.21		16.05		9.50
10 PERCENT EXCEEDS	1310		2610		1710
50 PERCENT EXCEEDS	469		1000		325
90 PERCENT EXCEEDS	137		160		42

A - Estimated.
B - From graph based on gage readings.