05569500 DATA: Discharge Tables, 2003

Station list Available data
ILLINOIS RIVER BASIN

05569500 SPOON RIVER AT LONDON MILLS, IL


LOCATION.-- Lat 40°42'26", long 90°16'48" (NAD of 1927), 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 southwest 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 to current year.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978-91.
	MISCELLANEOUS: Water years 1998 and 2002.

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 crest-stage gage. Datum of gage is 508.97 ft above NGVD of 1929. 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 estimated daily discharges, which are poor.

Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	63	80	87	104	80	88	163	299	422	263	158	133
2	63	75	86	104	87	85	144	2460	381	242	147	118
3	64	74	69	99	96	88	137	1880	376	230	198	109
4	65	72	65	105	98	85	148	1120	391	221	200	94
5	65	74	66	116	103	76	200	1300	369	208	155	65

6	83	76	70	100	95	81	185	2130	355	191	134	49
7	77	78	68	92	95	82	199	1570	400	177	122	40
8	80	79	58	103	80	111	226	1150	409	201	109	36
9	71	78	55	95	71	144	210	1240	370	642	101	33
10	64	76	59	78	67	152	182	2540	354	2860	93	31

11	60	76	55	80	65	132	163	3900	363	2310	88	29
12	61	75	61	84	66	151	148	3910	361	1900	86	29
13	60	74	65	68	62	596	135	2410	347	956	85	37
14	58	72	71	e55	63	648	128	1630	344	684	84	42
15	61	73	74	e51	63	572	122	1590	319	529	81	46

16	57	74	75	e50	63	457	125	1900	286	437	75	42
17	58	93	79	e48	66	463	174	1340	266	375	71	37
18	67	94	136	e48	67	400	225	1130	255	330	67	36
19	71	94	296	e47	72	344	187	998	251	304	63	30
20	68	94	299	e46	86	349	185	940	244	281	57	25

21	67	97	245	e45	125	332	181	914	227	479	51	25
22	69	94	177	e45	251	264	164	801	218	604	46	29
23	69	93	135	e44	264	222	151	733	213	591	44	28
24	65	92	96	e43	198	187	141	683	206	336	41	29
25	68	90	98	e43	169	182	144	635	211	272	38	29

26	75	89	135	e44	126	184	148	585	590	241	35	27
27	84	87	139	e46	106	161	130	523	547	221	32	29
28	80	89	138	e49	98	164	124	484	404	209	31	33
29	82	86	119	e58	---	203	126	475	344	193	45	38
30	82	84	119	67	---	212	137	504	298	187	44	43

31	82	---	116	73	---	185	---	447	---	172	53	---

TOTAL	2139	2482	3411	2130	2882	7400	4832	42221	10121	16846	2634	1371
MEAN	69.0	82.7	110	68.7	103	239	161	1362	337	543	85.0	45.7
MAX	84	97	299	116	264	648	226	3910	590	2860	200	133
MIN	57	72	55	43	62	76	122	299	206	172	31	25
CFSM	0.06	0.08	0.10	0.06	0.10	0.22	0.15	1.27	0.31	0.51	0.08	0.04
IN.	0.07	0.09	0.12	0.07	0.10	0.26	0.17	1.47	0.35	0.58	0.09	0.05

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 2003, BY WATER YEAR (WY)
MEAN	296	385	452	650	963	1177	1295	1261	1141	716	329	341
MAX	3647	2196	3090	3262	3963	4185	3905	4793	6036	4654	2989	3715
(WY)	1987	1986	1983	1974	2001	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 2002 CALENDAR YEAR		FOR 2003 WATER YEAR		WATER YEARS 1943 - 2003
ANNUAL TOTAL	303787		98469
ANNUAL MEAN	832		270		748
HIGHEST ANNUAL MEAN					2205	1993
LOWEST ANNUAL MEAN					150	1989
HIGHEST DAILY MEAN	11800	May 13	3910	May 12	35100	Jun 23 1974
LOWEST DAILY MEAN	55	Dec 9, 11	25	Sep 20, 21	3.0	Sep 15 1988
ANNUAL SEVEN-DAY MINIMUM	59	Oct 11	27	Sep 20	3.3	Sep 12 1988
MAXIMUM PEAK FLOW			4760	May 11	41000	Jun 23 1974
MAXIMUM PEAK STAGE			13.25	May 11	28.03 A	Jun 23 1974
INSTANTANEOUS LOW FLOW			23	Sep 21	2.6	Sep 16 1988
ANNUAL RUNOFF (CFSM)	0.78		0.25		0.70
ANNUAL RUNOFF (INCHES)	10.54		3.42		9.49
10 PERCENT EXCEEDS	1990		577		1730
50 PERCENT EXCEEDS	289		101		321
90 PERCENT EXCEEDS	71		45		45

	A - From graph based on gage readings.