05569500 DATA: Discharge Tables, 2002

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 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 1994-2002.
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 rain gage, 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 Mar. 14 to Sep. 10, and those for estimated daily discharges, which are poor.

DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	100	195	212	e150	341	607	523	1710	1740	913	226	186
2	98	189	208	e146	326	661	515	1710	1490	839	189	166
3	94	185	202	e143	320	579	578	1520	1390	777	166	150
4	94	174	197	e145	245	524	673	1290	1410	727	150	135
5	145	163	199	155	252	542	657	1170	4400	674	142	124

6	171	157	197	168	274	576	608	1130	4000	637	143	116
7	182	154	192	171	272	718	639	1100	2510	677	134	109
8	180	154	188	171	234	974	1210	1010	2020	656	129	104
9	154	143	181	174	237	1650	3300	1180	1770	574	122	99
10	143	140	175	180	576	1980	3400	1180	1610	526	112	e94

11	136	135	167	187	906	1480	2500	3110	1780	562	106	88
12	154	135	171	189	948	1230	2010	10000	2970	744	100	86
13	227	132	201	186	848	1070	1690	11800	6180	516	100	83
14	414	132	272	186	777	956	1480	8900	9160	440	1470	82
15	493	131	312	176	759	865	1360	8110	7280	385	1130	84

16	370	130	291	170	706	766	1240	5560	3400	340	400	81
17	266	130	266	152	675	678	1130	3610	2450	306	248	78
18	213	131	263	153	634	645	1050	3100	2040	284	189	78
19	178	135	256	148	653	615	985	2650	1790	300	369	84
20	160	134	234	e149	851	590	921	2340	1620	289	644	91

21	149	148	219	150	e1060	568	965	2100	1470	255	446	90
22	161	171	221	148	1150	499	1060	1920	1360	223	258	85
23	301	169	266	162	1010	475	987	1810	1270	199	2610	82
24	409	187	283	164	922	509	934	2670	1180	180	4510	80
25	513	270	e250	159	849	508	1230	2910	1090	168	1880	74

26	389	283	e260	155	768	493	1170	3160	1050	162	885	70
27	299	276	e280	146	665	487	1310	2530	1090	836	733	69
28	250	245	e230	152	567	496	3160	2150	1420	1120	415	69
29	219	227	e200	151	---	532	2670	1940	1320	717	304	68
30	201	218	e165	157	---	597	2020	1740	1010	528	248	66

31	192	---	e155	195	---	562	---	1600	---	311	211	---

TOTAL	7055	5173	6913	5038	17825	23432	41975	96710	73270	15865	18769	2871
MEAN	227.6	172.4	223.0	162.5	636.6	755.9	1399	3120	2442	511.8	605.5	95.70
MAX	513	283	312	195	1150	1980	3400	11800	9160	1120	4510	186
MIN	94	130	155	143	234	475	515	1010	1010	162	100	66
CFSM	0.21	0.16	0.21	0.15	0.59	0.71	1.31	2.91	2.28	0.48	0.56	0.09
IN.	0.24	0.18	0.24	0.17	0.62	0.81	1.46	3.36	2.54	0.55	0.65	0.10

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 2002, BY WATER YEAR (WY)
MEAN	299.5	389.8	457.6	659.3	976.9	1192	1314	1260	1154	719.2	333.0	346.3
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 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1943 - 2002
ANNUAL TOTAL	356505		314896
ANNUAL MEAN	976.7		862.7		756.4
HIGHEST ANNUAL MEAN					2205	1993
LOWEST ANNUAL MEAN					150	1989
HIGHEST DAILY MEAN	9840	Feb 10	11800	May 13	35100	Jun 23 1974
LOWEST DAILY MEAN	80	Sep 17	66	Sep 30	3.0	Sep 15 1988
ANNUAL SEVEN-DAY MINIMUM	86	Sep 2	71	Sep 24	3.3	Sep 12 1988
MAXIMUM PEAK FLOW			13200	May 13	41000	Jun 23 1974
MAXIMUM PEAK STAGE			23.29	May 13	28.03 A	Jun 23 1974
INSTANTANEOUS LOW FLOW			63	Sep 30	2.6	Sep 16 1988
ANNUAL RUNOFF (CFSM)	0.91		0.80		0.71
ANNUAL RUNOFF (INCHES)	12.37		10.93		9.59
10 PERCENT EXCEEDS	2250		1990		1740
50 PERCENT EXCEEDS	307		312		329
90 PERCENT EXCEEDS	128		130		45

A-From graph based on gage readings.