05569500 DATA: Discharge Tables, 1999

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 June 1- Aug. 19, 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 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	129	590	543	e380	2280	766	573	2430	1130	2440	198	82
2	132	583	499	e480	2530	710	572	2050	2330	1610	180	78
3	135	678	478	e470	2790	689	570	1840	1850	1060	167	76
4	144	768	484	e450	2470	663	630	1680	1530	854	157	76
5	244	724	462	e430	2010	642	575	1620	2000	749	149	73

6	628	662	515	e520	1780	678	548	1500	1800	674	143	70
7	527	615	1690	e480	1650	660	552	1390	1400	614	162	68
8	388	589	1970	e450	1540	607	517	1290	1280	562	196	67
9	296	640	1520	e430	1440	e560	1280	1190	2700	528	165	63
10	248	1400	1210	e410	1340	e640	1450	1110	3610	498	151	61

11	224	2830	1060	e390	1340	e680	1120	1060	2410	456	141	59
12	207	2260	971	e370	1930	673	922	1070	1570	419	251	58
13	190	1570	910	e360	1790	648	797	4260	1830	393	363	59
14	175	1350	848	e350	1450	656	740	6880	3310	371	284	58
15	167	1210	787	e345	1360	684	808	7840	3200	346	220	58

16	169	1100	751	e340	1280	797	3180	6680	1780	325	145	57
17	219	1020	726	e340	1200	1120	4990	4620	1500	309	113	55
18	1800	930	694	e355	1100	1390	3950	5840	1320	298	102	56
19	3240	872	663	e370	1040	1260	2680	3610	1210	303	97	56
20	2680	825	612	e400	973	1050	2160	2580	1130	663	98	56

21	1530	770	555	e440	909	959	1910	2210	1050	403	97	55
22	1120	730	464	4110	841	886	1740	2250	981	307	95	53
23	960	706	e420	7200	837	809	2310	2140	938	250	105	53
24	853	671	e470	7690	835	765	2720	1850	1200	460	911	53
25	775	622	e540	7150	812	717	2160	1640	1210	283	387	52

26	711	605	e570	e5770	795	664	1830	1490	947	230	233	51
27	666	579	e560	e3750	792	633	1750	1370	938	214	156	53
28	706	544	e550	4880	805	631	2770	1280	1570	532	124	1870
29	785	538	e500	4160	---	630	4220	1200	1000	509	107	1500
30	736	543	e400	2750	---	597	3330	1140	859	283	95	600

31	650	---	e300	2300	---	575	---	1080	---	225	87	---

TOTAL	21434	27524	22722	58320	39919	23439	53354	78190	49583	17168	5879	5626
MEAN	691	917	733	1881	1426	756	1778	2522	1653	554	190	188
MAX	3240	2830	1970	7690	2790	1390	4990	7840	3610	2440	911	1870
MIN	129	538	300	340	792	560	517	1060	859	214	87	51
CFSM	.64	.86	.68	1.75	1.33	.71	1.66	2.35	1.54	.52	.18	.17
IN.	.74	.96	.79	2.02	1.39	.81	1.85	2.71	1.72	.60	.20	.20

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 1999, BY WATER YEAR (WY)
MEAN	306	401	472	682	940	1205	1327	1235	1105	728	335	358
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 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1943 - 1999
ANNUAL TOTAL	485505		403158
ANNUAL MEAN	1330		1105		756
HIGHEST ANNUAL MEAN					2205	1993
LOWEST ANNUAL MEAN					150	1989
HIGHEST DAILY MEAN	8090	Mar 19	7840	May 15	35100	Jun 23 1974
LOWEST DAILY MEAN	95	Sep 13	51	Sep 26	3.0	Sep 15 1988
ANNUAL SEVEN-DAY MINIMUM	101	Sep 7	53	Sep 21	3.3	Sep 12 1988
INSTANTANEOUS PEAK FLOW			8110	May 15	41000	Jun 23 1974
INSTANTANEOUS PEAK STAGE			18.69	May 15	28.03 A	Jun 23 1974
INSTANTANEOUS LOW FLOW			50	Sep 26, 27	2.6	Sep 16 1988
ANNUAL RUNOFF (CFSM)	1.24		1.03		.71
ANNUAL RUNOFF (INCHES)	16.85		13.99		9.58
10 PERCENT EXCEEDS	2720		2430		1740
50 PERCENT EXCEEDS	1060		684		330
90 PERCENT EXCEEDS	168		111		43

A - From graph based on gage readings.