05576500 DATA: Discharge Tables, 2001

Station list Available data
ILLINOIS RIVER BASIN

05576500 SANGAMON RIVER AT RIVERTON, IL

LOCATION.-- Lat 39°50'35", long 89°32'50", 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 1994-2001.

PARTIAL RECORD: Annual maximum, water years 1957-85.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-91.

MISCELLANEOUS: May and July 1998.

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 rain gage, and crest-stage gage. Datum of gage is 508.38 ft above sea level. 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 good except 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	446	240	902	e375	8860	16100	1310	771	1020	447	110	401
2	349	233	658	e370	7840	14800	1290	618	1230	393	109	161
3	290	224	602	e370	7370	12800	995	545	1150	351	122	137
4	262	222	575	e380	6810	10000	978	511	1890	336	152	115
5	449	214	641	e400	6120	7700	1060	e500	3770	363	119	102

6	2150	235	562	e420	5060	5220	1180	e490	6860	331	105	99
7	3610	569	505	e430	3310	3520	1030	482	15700	373	100	112
8	4290	1510	564	e440	2760	3030	917	483	20800	323	98	135
9	4480	1890	550	e430	3550	2500	945	441	16800	e260	97	164
10	4720	2200	503	e420	4690	2140	932	424	13500	e230	96	181

11	4660	2500	560	e410	5190	1920	3390	695	11900	e200	94	167
12	4040	2400	e620	e400	5000	1830	5660	901	9920	e185	94	147
13	3290	2350	e700	e410	4950	1760	5040	819	8090	176	92	104
14	2450	2630	e850	e450	5370	1590	3460	756	6400	164	97	108
15	1630	2740	e1000	e600	5780	1700	3370	631	4380	158	96	105

16	1230	2630	e1200	e900	6430	2370	3310	470	2880	156	103	101
17	1360	2610	e1050	1250	5870	2590	2470	396	2180	153	101	111
18	1280	2440	e950	1340	5500	2410	1920	745	1850	156	104	128
19	952	2180	e850	1340	4960	2770	1640	1230	1600	140	107	136
20	733	1640	e780	1200	3980	3180	1470	1360	1360	142	160	148

21	621	1100	e720	1000	3290	2800	1820	1230	1110	131	116	151
22	555	951	e670	e850	2660	2530	1800	1230	1230	125	103	129
23	496	980	e620	778	2250	2420	1900	1230	1260	123	162	123
24	440	847	e570	720	3140	2100	1270	1130	1190	127	208	112
25	399	706	e530	664	7900	1850	1020	923	1110	124	233	106

26	372	656	e490	e620	13600	1720	859	770	1050	113	162	102
27	342	648	e460	e580	17100	1580	772	779	984	e105	113	99
28	308	1170	e430	e550	16900	1220	826	922	845	e120	102	97
29	287	1100	e410	1910	---	1480	1440	1040	583	e140	97	94
30	267	1220	e390	6940	---	1400	1120	947	501	e150	93	90

31	253	---	e380	8730	---	1250	---	891	---	e120	245	---

TOTAL	47011	41035	20292	35677	176240	120280	55194	24360	143143	6415	3790	3965
MEAN	1516	1368	655	1151	6294	3880	1840	786	4771	207	122	132
MAX	4720	2740	1200	8730	17100	16100	5660	1360	20800	447	245	401
MIN	253	214	380	370	2250	1220	772	396	501	105	92	90
CFSM	.58	.52	.25	.44	2.40	1.48	.70	.30	1.82	.08	.05	.05
IN.	.67	.58	.29	.51	2.50	1.71	.78	.35	2.03	.09	.05	.06

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1908 - 2001, BY WATER YEAR (WY)
MEAN	860	947	1120	1853	2322	2788	3251	3118	2353	1111	520	573
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 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1908 - 2001
ANNUAL TOTAL	270927		677402
ANNUAL MEAN	740		1856		1727
HIGHEST ANNUAL MEAN					4808	1927
LOWEST ANNUAL MEAN					114	1954
HIGHEST DAILY MEAN	4720	Oct 10	20800	Jun 8	67700	May 19 1943
LOWEST DAILY MEAN	57	Sep 8	90	Sep 30	3.0	A
ANNUAL SEVEN-DAY MINIMUM	63	Sep 5	95	Aug 9	3.0	Oct 3 1914
MAXIMUM PEAK FLOW			21800	Jun 8	68700	May 19 1943
MAXIMUM PEAK STAGE			22.72	Jun 8	31.52 B	May 19 1943
INSTANTANEOUS LOW FLOW			88	Sep 30
ANNUAL RUNOFF (CFSM)	.28		.71		.66
ANNUAL RUNOFF (INCHES)	3.85		9.63		8.96
10 PERCENT EXCEEDS	2140		4980		4620
50 PERCENT EXCEEDS	399		778		660
90 PERCENT EXCEEDS	108		113		61

	A - Oct. 3-15, 1914.
	B - From graph based on gage readings.