05569500 DATA: Discharge Tables, 2001

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 1994-2001.

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 Dec. 5 to Aug. 9, and those for estimated daily discharges, which are poor.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	105	127	227	e140	e3400	2240	902	665	3170	697	e200	93
2	96	133	216	e145	3420	1910	848	641	2880	648	e260	90
3	92	136	204	e150	2450	1710	793	603	2270	622	e230	87
4	198	139	195	e150	2210	1570	741	561	2060	650	e260	83
5	379	136	183	e160	1950	1430	761	550	3750	659	e210	82

6	422	147	e195	e160	1690	1290	1060	548	6500	609	e190	84
7	336	198	e210	e165	1690	1210	1450	646	6010	e570	e170	89
8	246	224	e230	e170	2150	1130	1760	679	5520	e530	e155	89
9	207	274	e210	e165	7770	1070	1400	585	4150	490	145	101
10	182	405	e190	e160	9840	1000	1280	531	2380	481	139	111

11	170	465	e200	e155	8800	990	1340	933	2010	460	131	122
12	160	412	e210	e150	8150	1000	2360	1530	1790	402	126	113
13	152	347	e200	e155	6060	1050	2230	1360	1630	373	119	112
14	149	303	e190	e160	3270	1040	1770	1280	1500	352	115	102
15	153	287	e180	e170	3500	1100	1580	1680	1490	334	110	88

16	148	282	e175	e190	2970	2300	1560	1360	1400	318	119	82
17	141	268	e165	e230	2240	3190	1530	2180	1260	307	114	80
18	135	248	e160	e215	1900	2920	1400	3650	1190	326	138	113
19	133	223	e150	e200	1810	2550	1310	2590	1120	346	143	538
20	130	208	e145	e185	1750	2240	1250	1830	1050	334	153	479

21	127	174	e140	e175	1620	2000	1220	2860	1270	309	149	319
22	124	208	e135	e160	1450	1790	1200	2750	1470	299	137	226
23	126	318	e130	e150	1340	1590	1120	2170	1180	299	179	191
24	128	306	e125	e140	2870	1430	1020	1740	1040	e280	153	173
25	131	265	e125	e135	7800	1290	948	1540	960	e265	134	151

26	131	279	e120	e135	7550	1170	940	1510	905	e245	124	140
27	131	277	e120	e130	7070	1110	838	1880	848	e225	139	123
28	134	254	e120	e130	4250	1060	767	1980	801	e210	136	117
29	129	238	e125	e260	---	1030	718	1610	765	e200	113	112
30	125	234	e130	e3000	---	987	684	1390	734	e190	103	105

31	127	---	e135	e4600	---	933	---	1660	---	e180	100	---

TOTAL	5147	7515	5240	12390	110970	47330	36780	45492	63103	12210	4694	4395
MEAN	166	250	169	400	3963	1527	1226	1467	2103	394	151	146
MAX	422	465	230	4600	9840	3190	2360	3650	6500	697	260	538
MIN	92	127	120	130	1340	933	684	531	734	180	100	80
CFSM	.15	.23	.16	.37	3.70	1.42	1.14	1.37	1.96	.37	.14	.14
IN.	.18	.26	.18	.43	3.85	1.64	1.28	1.58	2.19	.42	.16	.15

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1943 - 2001, BY WATER YEAR (WY)
MEAN	301	393	462	668	983	1200	1313	1228	1132	723	328	351
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 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1943 - 2001
ANNUAL TOTAL	172103		355266
ANNUAL MEAN	470		973		755
HIGHEST ANNUAL MEAN					2205	1993
LOWEST ANNUAL MEAN					150	1989
HIGHEST DAILY MEAN	6930	Jun 25	9840	Feb 10	35100	Jun 23 1974
LOWEST DAILY MEAN	48	Sep 11	80	Sep 17	3.0	Sep 15 1988
ANNUAL SEVEN-DAY MINIMUM	51	Sep 5	86	Sep 2	3.3	Sep 12 1988
MAXIMUM PEAK FLOW			10100	Feb 10	41000	Jun 23 1974
MAXIMUM PEAK STAGE			21.00	Feb 10	28.03 A	Jun 23 1974
INSTANTANEOUS LOW FLOW			79	Sep 18	2.6	Sep 16 1988
ANNUAL RUNOFF (CFSM)	.44		.91		.70
ANNUAL RUNOFF (INCHES)	5.97		12.33		9.56
10 PERCENT EXCEEDS	1070		2250		1740
50 PERCENT EXCEEDS	268		309		330
90 PERCENT EXCEEDS	91		124		44

A- From graph based on gage readings.