05576500 DATA: Discharge Tables, 2003

Station list Available data
ILLINOIS RIVER BASIN

05576500 SANGAMON RIVER AT RIVERTON, IL


LOCATION.-- Lat 39°50'35", long 89°32'50" (NAD of 1927), in NW1/4NE1/4 sec.16, T.16 N., R.4 W., Sangamon County, Hydrologic Unit 07130008, at right abutment on former U.S. Highway 36 bridge in Riverton, 2.2 mi downstream from Sugar Creek, 5.6 mi upstream from Fancy Creek, and at mile 83.1.

DRAINAGE AREA.-- 2,618 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: February 1908 to December 1912, August 1914 to October 1956, and January 1986 to current year.
	STAGE: Water years 1994 to current year.
	PARTIAL RECORD: Annual maximum, water years 1957-85.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978-91.
	MISCELLANEOUS: Water years 1998 and 2002.

REVISED RECORDS.-- WSP 1208: 1908-9, 1921-22, 1926-27, 1947. WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 508.38 ft above NGVD of 1929. Prior to Aug. 14, 1934, chain gage on old Wabash Railway bridge (currently Norfolk and Western Railway bridge), 1,450 ft downstream, at datum 5.61 ft lower.

REMARKS.-- Some regulation by municipal reservoirs at Decatur (since 1922) and at Springfield (since 1934).

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 68,700 ft³/s, May 19, 1943, gage height, 31.52 ft, from graph based on gage readings; minimum daily, 3.0 ft³/s, Oct. 3-15, 1914.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: The high water of 1883 reached a stage of approximately 32 ft with respect to the gage at the old Wabash Railway bridge. The high water of 1875 is said to have been about one-half foot lower.

REMARKS FOR CURRENT YEAR.-- Records fair 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	140	172	117	220	145	e240	858	486	1060	1110	331	1540
2	113	181	117	213	157	e230	553	439	1100	950	296	2890
3	106	211	115	213	134	e220	365	471	1180	568	601	3010
4	107	210	116	203	121	e213	310	446	1200	428	1320	3210
5	104	182	115	191	120	e208	294	845	978	372	1540	3200

6	139	219	109	182	134	203	584	1920	828	324	1470	2840
7	110	182	125	175	110	206	824	2330	864	293	1030	2300
8	95	174	121	170	105	227	846	2760	865	266	839	1820
9	92	148	110	154	118	234	763	2580	767	278	616	1070
10	86	139	111	132	111	227	825	4090	730	941	428	557

11	83	143	107	92	101	223	1330	8790	854	1880	382	360
12	83	141	114	108	e101	224	1110	12300	1750	2120	250	374
13	84	129	108	161	e102	332	970	10200	2720	2080	179	271
14	84	115	101	140	e104	631	873	8000	3520	2040	159	215
15	83	124	97	95	e107	728	708	6490	3880	2280	146	193

16	83	120	96	118	e110	509	465	5580	4180	2420	140	181
17	80	120	98	102	e115	470	448	4900	3870	2450	133	166
18	83	148	130	112	e125	778	672	3880	3480	1990	129	150
19	145	163	194	124	e150	512	727	3110	2930	1970	134	138
20	185	128	358	e115	e200	875	657	2640	2530	1610	170	130

21	170	135	370	e105	e300	1280	630	2530	2130	1660	137	126
22	122	139	320	e95	e400	1410	544	2480	1670	2120	126	122
23	109	127	259	e90	e370	1370	341	2270	1520	2170	121	118
24	99	133	223	e86	e330	1090	377	2050	1250	1890	115	114
25	125	131	201	e88	e300	678	438	1910	989	1310	109	109

26	141	128	188	e90	e280	515	538	1660	1010	796	108	112
27	154	122	172	e91	e260	446	645	1540	1040	512	111	133
28	157	117	159	e94	e250	412	653	1520	1340	416	104	132
29	167	117	158	e98	---	504	673	1520	1090	364	105	137
30	191	117	160	e103	---	867	606	1400	993	358	107	121

31	214	---	193	119	---	980	---	1190	---	366	232	---

TOTAL	3734	4415	4962	4079	4960	17042	19627	102327	52318	38332	11668	25839
MEAN	120	147	160	132	177	550	654	3301	1744	1237	376	861
MAX	214	219	370	220	400	1410	1330	12300	4180	2450	1540	3210
MIN	80	115	96	86	101	203	294	439	730	266	104	109
CFSM	0.05	0.06	0.06	0.05	0.07	0.21	0.25	1.26	0.67	0.47	0.14	0.33
IN.	0.05	0.06	0.07	0.06	0.07	0.24	0.28	1.45	0.74	0.54	0.17	0.37

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1908 - 2003, BY WATER YEAR (WY)
MEAN	849	929	1130	1814	2335	2775	3258	3313	2394	1105	518	572
MAX	12280	5516	7500	12940	7762	8117	14100	16760	8596	4819	5914	12730
(WY)	1927	1942	1928	1950	1951	1939	1922	1943	1998	1951	1915	1926
MIN	7.29	12.6	27.5	29.5	34.6	50.8	180	113	146	49.1	40.7	22.3
(WY)	1915	1915	1915	1918	1931	1954	1931	1954	1934	1954	1936	1922

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR		FOR 2003 WATER YEAR		WATER YEARS 1908 - 2003
ANNUAL TOTAL	1208161		289303
ANNUAL MEAN	3310		793		1742
HIGHEST ANNUAL MEAN					4808	1927
LOWEST ANNUAL MEAN					114	1954
HIGHEST DAILY MEAN	47900	May 14	12300	May 12	67700	May 19 1943
LOWEST DAILY MEAN	80	Oct 17	80	Oct 17	3.0	A
ANNUAL SEVEN-DAY MINIMUM	83	Oct 11	83	Oct 11	3.0	Oct 3 1914
MAXIMUM PEAK FLOW			12800	May 12	68700	May 19 1943
MAXIMUM PEAK STAGE			20.21	May 12	31.52 B	May 19 1943
INSTANTANEOUS LOW FLOW			51 C	Jan 11
ANNUAL RUNOFF (CFSM)	1.26		0.30		0.67
ANNUAL RUNOFF (INCHES)	17.17		4.11		9.04
10 PERCENT EXCEEDS	9380		2120		4620
50 PERCENT EXCEEDS	906		227		650
90 PERCENT EXCEEDS	115		105		61

	A - Oct. 3-15, 1914.
	B - From graph based on gage readings.
	C - Result of freeze-up.