05569500 DATA: Discharge Tables, 2004

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 2003 TO SEPTEMBER 2004 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	42	45	152	427	e200	408	911	644	4920	358	117	85
2	34	55	142	420	e198	401	836	594	4640	343	110	71
3	30	113	136	423	e194	379	766	526	2810	352	100	61
4	28	159	133	418	e191	373	710	625	1810	398	113	55
5	27	567	140	384	e189	1210	654	698	1540	407	123	49

6	25	405	151	248	e187	1750	616	633	1380	416	125	45
7	25	307	157	357	e182	1580	602	573	1250	356	145	41
8	25	227	152	397	e180	1200	579	594	1120	334	103	39
9	27	165	154	440	e178	989	544	1020	1020	319	83	37
10	27	135	2420	411	e175	858	501	858	1060	470	75	35

11	32	122	4580	381	e173	762	466	817	1460	566	69	33
12	36	110	3140	377	e170	688	446	1160	1350	1130	65	31
13	33	95	1810	384	e169	616	429	1090	1180	728	61	29
14	43	87	1390	388	e168	604	419	1110	1010	500	60	28
15	63	84	1190	365	e166	590	410	1210	1010	389	56	41

16	75	79	1040	362	e166	569	400	1420	948	331	53	795
17	74	78	911	367	e162	570	389	1170	847	316	51	462
18	71	213	814	356	e164	580	378	1040	768	289	55	173
19	64	400	739	316	e190	566	360	1150	709	263	163	133
20	57	301	597	e280	e300	525	356	1210	652	244	151	78

21	52	298	585	e290	e1020	485	422	1010	634	228	110	59
22	48	234	659	e280	e1000	450	471	1280	652	223	107	47
23	37	205	626	e260	e960	430	420	1400	607	278	78	39
24	31	185	548	e255	e860	445	370	1670	538	238	70	36
25	44	191	459	e245	e730	468	411	1310	493	221	78	32

26	50	203	465	e235	e630	515	449	1500	460	187	126	30
27	48	194	518	e230	e540	732	421	1450	438	167	129	29
28	52	184	496	e225	e450	757	381	1220	420	153	226	28
29	49	175	496	e220	432	928	368	1040	401	141	222	26
30	45	162	480	e210	---	973	384	1230	379	134	161	25

31	45	---	453	e208	---	969	---	4910	---	125	117	---

TOTAL	1339	5778	25733	10159	10324	22370	14869	36162	36506	10604	3302	2672
MEAN	43.2	193	830	328	356	722	496	1167	1217	342	107	89.1
MAX	75	567	4580	440	1020	1750	911	4910	4920	1130	226	795
MIN	25	45	133	208	162	373	356	526	379	125	51	25
CFSM	0.04	0.18	0.77	0.31	0.33	0.67	0.46	1.09	1.14	0.32	0.10	0.08
IN.	0.05	0.20	0.89	0.35	0.36	0.78	0.52	1.25	1.27	0.37	0.11	0.09

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 2004, BY WATER YEAR (WY)
MEAN	292	382	458	644	953	1169	1282	1260	1142	710	325	337
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 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1943 - 2004
ANNUAL TOTAL	123287		179818
ANNUAL MEAN	338		491		744
HIGHEST ANNUAL MEAN					2205	1993
LOWEST ANNUAL MEAN					150	1989
HIGHEST DAILY MEAN	4580	Dec 11	4920	Jun 1	35100	Jun 23 1974
LOWEST DAILY MEAN	25	A	25	B	3.0	Sep 15 1988
ANNUAL SEVEN-DAY MINIMUM	26	Oct 4	26	Oct 4	3.3	Sep 12 1988
MAXIMUM PEAK FLOW			5510	May 31	41000	Jun 23 1974
MAXIMUM PEAK STAGE			14.47	May 31	28.03 C	Jun 23 1974
INSTANTANEOUS LOW FLOW			24	D	2.6	Sep 16 1988
ANNUAL RUNOFF (CFSM)	0.315		0.458		0.694
ANNUAL RUNOFF (INCHES)	4.28		6.24		9.43
10 PERCENT EXCEEDS	704		1120		1700
50 PERCENT EXCEEDS	148		356		322
90 PERCENT EXCEEDS	38		45		45

	A - Sept. 20,21 and Oct. 6-8.
	B - Oct. 6-8 and Sept. 30.
	C - From graph based on gage readings.
	D - Oct. 7-8 and Sept. 30.