05576500 DATA: Discharge Tables, 2000

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 1994-2000.

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 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	161	113	89	117	e94	380	274	523	2230	2030	313	100
2	125	108	88	121	e103	332	242	591	1890	1680	270	93
3	115	107	92	121	e108	313	207	736	1530	1390	250	87
4	127	103	120	125	e110	314	193	644	1270	1310	304	82
5	128	110	238	164	e110	314	181	401	869	1560	299	73

6	119	120	205	147	e110	311	167	280	896	2750	494	67
7	99	130	208	147	e110	299	168	243	993	3440	753	61
8	145	133	145	136	e110	225	210	245	951	2860	647	57
9	169	124	124	136	e112	171	380	299	698	2410	542	58
10	223	113	134	128	116	146	376	331	610	1930	439	60

11	174	99	119	113	140	149	240	420	707	1710	330	63
12	135	101	116	108	146	159	178	505	678	1840	259	172
13	117	97	104	107	138	160	155	456	803	2010	e210	115
14	100	95	95	137	132	173	141	548	848	1820	e175	122
15	90	95	131	119	127	406	131	733	1260	1400	150	105

16	95	94	189	116	117	294	125	873	1510	1150	137	125
17	111	101	139	108	115	215	153	687	1230	1000	140	112
18	95	88	123	103	230	401	346	399	842	902	204	95
19	96	83	111	102	400	307	542	424	926	814	267	82
20	90	89	e100	e100	403	346	589	514	752	749	190	70

21	88	90	e88	e94	297	789	529	610	2140	580	146	73
22	87	96	e83	e98	252	1020	334	516	3610	549	134	71
23	82	112	e87	e97	228	1040	325	311	3350	428	154	76
24	79	124	e96	e96	212	522	542	403	3360	381	174	135
25	75	118	e105	e93	187	336	1020	440	4180	499	139	167

26	73	121	e94	e88	179	284	1250	449	4480	320	160	205
27	83	101	e97	e84	172	539	1220	419	4490	258	221	303
28	93	93	e100	e81	186	681	837	981	4140	227	203	583
29	117	92	e103	e82	173	565	463	2440	3420	212	159	712
30	111	88	e108	e84	---	483	513	2650	2670	223	127	632

31	114	---	112	e87	---	303	---	2200	---	331	112	---

TOTAL	3516	3138	3743	3439	4917	11977	12031	21271	57333	38763	8102	4756
MEAN	113	105	121	111	170	386	401	686	1911	1250	261	159
MAX	223	133	238	164	403	1040	1250	2650	4490	3440	753	712
MIN	73	83	83	81	94	146	125	243	610	212	112	57
CFSM	.04	.04	.05	.04	.06	.15	.15	.26	.73	.48	.10	.06
IN.	.05	.04	.05	.05	.07	.17	.17	.30	.81	.55	.12	.07

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1908 - 2000, BY WATER YEAR (WY)
MEAN	849	940	1128	1865	2257	2770	3274	3156	2314	1125	527	580
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 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1908 - 2000
ANNUAL TOTAL	649900		172986
ANNUAL MEAN	1781		473		1725
HIGHEST ANNUAL MEAN					4808	1927
LOWEST ANNUAL MEAN					114	1954
HIGHEST DAILY MEAN	10500	Feb 10	4490	Jun 27	67700	May 19 1943
LOWEST DAILY MEAN	73	Oct 26	57	Sep 8	3.0	A
ANNUAL SEVEN-DAY MINIMUM	81	Oct 21	63	Sep 5	3.0	Oct 3 1914
INSTANTANEOUS PEAK FLOW			4570	Jun 26	68700	May 19 1943
INSTANTANEOUS PEAK STAGE			13.64	Jun 26	31.52 B	May 19 1943
INSTANTANEOUS LOW FLOW			55	Sep 8
ANNUAL RUNOFF (CFSM)	.68		.18		.66
ANNUAL RUNOFF (INCHES)	9.23		2.46		8.95
10 PERCENT EXCEEDS	5420		1220		4620
50 PERCENT EXCEEDS	376		172		658
90 PERCENT EXCEEDS	96		90		60

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