05576500 DATA: Discharge Tables, 1999

Station list Available data
ILLINOIS RIVER BASIN

05576500 SANGAMON RIVER AT RIVERTON, IL

LOCATION.--Lat 39°50'34", long 89°32'52", 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.--February 1908 to December 1912, August 1914 to October 1956, and annual maximum, water years 1957- 85. January 1986 to current year.

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

GAGE.--Water-stage recorder 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.--Records good except those for estimated daily discharges, which are poor. Some regulation by municipal reservoirs at Decatur (since 1922) and at Springfield (since 1934). U.S. Army Corps of Engineers satellite telemeter at station.

EXTREMES OUTSIDE PERIOD OF RECORD.--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.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	118	201	249	e170	5510	1890	761	4870	1330	1730	173	170
2	114	197	240	e190	5220	1760	809	4570	2560	1390	155	162
3	115	521	237	e180	4700	1950	887	4250	4230	1340	151	153
4	114	1090	249	e160	4280	1960	1110	3540	4790	1140	157	152
5	124	994	262	e140	3800	2380	1180	3200	4770	1060	147	148

6	163	752	236	e160	3450	2480	1440	3810	5650	1010	150	137
7	242	629	237	e180	4460	2090	1710	3720	6250	815	171	132
8	194	564	231	e170	8030	1940	1760	3170	6180	614	156	139
9	156	512	234	e165	10200	2140	2490	2880	5530	709	166	130
10	147	617	224	e155	10500	2180	2990	2760	5130	563	141	121

11	182	758	220	e150	10400	2110	2750	2690	3530	431	130	116
12	178	709	232	e142	9960	2330	2290	2590	3110	389	142	115
13	150	620	277	e138	9000	2520	2110	3350	3640	376	1180	120
14	131	630	290	e135	8150	2510	1990	4120	5430	356	2140	114
15	122	592	288	e132	7030	2460	2450	4050	7870	344	1960	112

16	114	528	281	e140	5410	2400	4490	3610	8560	324	905	107
17	129	471	262	e180	4020	2260	6780	3890	7220	303	454	107
18	140	420	227	304	3570	2120	8190	3630	5720	322	322	105
19	123	386	214	511	3150	2100	9630	3040	4590	516	284	110
20	136	364	200	746	2680	1940	9490	2940	3790	334	278	106

21	124	335	201	660	2360	1780	9500	2700	2750	279	298	100
22	119	315	179	1630	2190	1710	9470	2300	2030	242	239	101
23	113	304	164	3970	2030	1630	9560	2060	1840	220	228	97
24	107	296	173	5270	2420	1570	8240	2110	1870	219	348	93
25	103	281	194	5950	e1850	1430	6280	2020	1830	199	322	93

26	107	275	209	6840	e1750	1350	4830	1810	1990	186	257	86
27	112	270	207	7550	e1720	1230	4040	1760	2490	193	225	81
28	129	262	e180	7940	1890	1120	4510	1570	2190	337	263	118
29	150	256	e150	8020	---	1090	5520	1350	1960	414	208	205
30	181	253	e110	6950	---	972	5590	1290	1790	269	188	219

31	232	---	e140	5520	---	756	---	1260	---	202	177	---

TOTAL	4369	14402	6797	64548	139730	58158	132847	90910	120620	16826	12115	3749
MEAN	141	480	219	2082	4990	1876	4428	2933	4021	543	391	125
MAX	242	1090	290	8020	10500	2520	9630	4870	8560	1730	2140	219
MIN	103	197	110	132	1720	756	761	1260	1330	186	130	81
CFSM	.05	.18	.08	.80	1.91	.72	1.69	1.12	1.54	.21	.15	.05
IN.	.06	.20	.10	.92	1.99	.83	1.89	1.29	1.71	.24	.17	.05

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1908 - 1999, BY WATER YEAR (WY)
MEAN	861	954	1145	1894	2293	2767	3321	3196	2321	1123	531	587
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 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1908 - 1999
ANNUAL TOTAL	1042224		665071
ANNUAL MEAN	2855		1822		1746
HIGHEST ANNUAL MEAN					4808	1927
LOWEST ANNUAL MEAN					114	1954
HIGHEST DAILY MEAN	18700	Jun 20	10500	Feb 10	67700	May 19 1943
LOWEST DAILY MEAN	103	Oct 25	81	Sep 27	3.0	A
ANNUAL SEVEN-DAY MINIMUM	112	Oct 21	93	Sep 21	3.0	Oct 3 1914
INSTANTANEOUS PEAK FLOW			10700	Feb 10	68700	May 19 1943
INSTANTANEOUS PEAK STAGE			18.62	Feb 10	31.52 B	May 19 1943
INSTANTANEOUS LOW FLOW			79	Sep 27-28
ANNUAL RUNOFF (CFSM)	1.09		.70		.67
ANNUAL RUNOFF (INCHES)	14.81		9.45		9.06
10 PERCENT EXCEEDS	8730		5420		4620
50 PERCENT EXCEEDS	1190		617		665
90 PERCENT EXCEEDS	144		129		59

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