05569500 DATA: Discharge Tables, 2000

Station list Available data
ILLINOIS RIVER BASIN

05569500 SPOON RIVER AT LONDON MILLS, IL

LOCATION.-- Lat 40°42'26", long 90°16'48", 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.--
SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1942 to current year.

STAGE: Water years 1994-2000.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-91.

MISCELLANEOUS: May and July 1998.

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, U.S. Army Corps of Engineers satellite telemeter and rain gage, 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.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 41,000 ft³/s, June 23, 1974, gage height, 28.03 ft, from graph based on gage readings; minimum, 2.6 ft³/s, Sept. 16, 1988.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Flood of Aug. 26, 1924, reached a stage of 27.08 ft, from information by local residents.

REMARKS FOR CURRENT YEAR.-- Records good except those for July 15, to Aug. 1, which are fair, and those for estimated daily discharges, which are poor.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	309	94	118	132	e93	1170	346	597	2960	1230	270	81
2	189	89	118	142	e96	1010	344	638	1390	1110	270	68
3	172	101	124	148	e100	871	345	583	1070	1070	243	64
4	263	97	132	152	e105	793	335	520	865	1030	198	61
5	246	95	285	131	e110	738	312	482	811	1340	191	56

6	203	93	521	150	e115	680	297	457	713	2080	245	54
7	172	91	438	135	e120	619	306	433	615	1630	335	52
8	146	93	319	142	e125	580	333	422	548	1170	302	51
9	132	96	251	137	131	553	321	530	504	1000	255	50
10	125	97	219	151	140	509	300	876	461	974	215	49

11	114	93	204	164	155	455	317	821	432	1160	182	48
12	107	92	190	149	159	417	320	741	484	1010	156	56
13	103	93	187	133	162	406	292	652	1160	867	141	59
14	99	94	167	129	159	394	271	543	1490	752	134	74
15	99	94	156	147	153	396	267	471	2210	672	128	77

16	101	92	153	141	153	429	269	456	1310	640	118	79
17	103	92	146	106	164	403	315	460	1170	596	108	76
18	101	94	141	137	226	350	335	458	879	554	99	70
19	99	93	130	89	323	365	338	442	715	523	93	56
20	97	92	124	e100	319	513	412	789	817	502	88	53

21	98	91	119	e110	291	660	1490	659	2100	469	83	56
22	97	89	e115	e105	283	637	2160	525	1710	433	82	63
23	100	93	e110	e100	406	573	1550	490	1320	403	82	1010
24	101	98	e110	e96	685	544	1250	456	4960	367	96	583
25	101	106	109	e94	950	537	1080	388	6930	331	91	438

26	102	135	111	e92	2360	501	955	342	5090	308	81	334
27	99	132	116	e88	2290	493	837	578	2880	283	76	230
28	94	131	121	85	1740	485	769	728	2030	273	72	170
29	96	125	122	85	1340	442	708	569	1650	255	75	139
30	94	119	129	e87	---	397	639	479	1420	243	115	119

31	94	---	130	e90	---	361	---	2010	---	242	101	---

TOTAL	4056	2994	5415	3747	13453	17281	17813	18595	50694	23517	4725	4376
MEAN	131	99.8	175	121	464	557	594	600	1690	759	152	146
MAX	309	135	521	164	2360	1170	2160	2010	6930	2080	335	1010
MIN	94	89	109	85	93	350	267	342	432	242	72	48
CFSM	.12	.09	.16	.11	.43	.52	.55	.56	1.58	.71	.14	.14
IN.	.14	.10	.19	.13	.47	.60	.62	.65	1.76	.82	.16	.15

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 2000, BY WATER YEAR (WY)
MEAN	303	396	467	672	932	1194	1314	1224	1115	728	331	354
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 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1943 - 2000
ANNUAL TOTAL	343943		166666
ANNUAL MEAN	942		455		751
HIGHEST ANNUAL MEAN					2205	1993
LOWEST ANNUAL MEAN					150	1989
HIGHEST DAILY MEAN	7840	May 15	6930	Jun 25	35100	Jun 23 1974
LOWEST DAILY MEAN	51	Sep 26	48	Sep 11	3.0	Sep 15 1988
ANNUAL SEVEN-DAY MINIMUM	53	Sep 21	51	Sep 5	3.3	Sep 12 1988
INSTANTANEOUS PEAK FLOW			7240	Jun 25	41000	Jun 23 1974
INSTANTANEOUS PEAK STAGE			17.50	Jun 25	28.03 A	Jun 23 1974
INSTANTANEOUS LOW FLOW			45	Sep 11	2.6	Sep 16 1988
ANNUAL RUNOFF (CFSM)	.88		.42		.70
ANNUAL RUNOFF (INCHES)	11.94		5.78		9.52
10 PERCENT EXCEEDS	2320		1070		1720
50 PERCENT EXCEEDS	460		236		330
90 PERCENT EXCEEDS	93		89		43

A - From graph based on gage readings.