USGS CD-ROM: Current Year Discharge

05576500 SANGAMON RIVER AT RIVERTON, IL

LOCATION.--Lat 39°50'34", long 89°32'52", in NW¼NE¼ 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. 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 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	80	79	1370	771	1060	1940	9560	3400	2680	5200	603	269
2	76	73	903	730	1090	1820	8700	5150	2500	4570	582	252
3	77	69	1100	706	1030	2150	7750	6850	2150	3880	542	237
4	79	76	971	666	849	2520	7540	8770	2000	3400	549	223
5	78	85	725	712	1110	1840	8320	10300	2060	3310	1590	210

6	75	136	654	792	1030	1500	8580	12300	2150	2730	4300	196
7	73	128	536	975	909	1540	7770	12800	2020	3200	3220	187
8	71	123	494	1900	750	1810	7260	14300	1780	3810	1860	176
9	76	98	489	3140	716	3120	6560	13600	2520	4070	1460	167
10	76	88	488	3280	754	3500	5800	13000	3770	3640	1240	163

11	75	97	580	3120	1030	3740	4990	12000	3880	3340	985	158
12	72	86	601	2970	1410	3650	4270	10400	6960	3180	691	153
13	85	79	584	3000	1320	3570	3820	9320	8610	2670	543	146
14	77	82	544	2930	1220	3670	4170	8490	9050	2350	466	144
15	88	80	518	2810	1240	3620	4070	7010	9000	2080	428	152

16	82	77	508	2520	1250	3530	3630	5950	10200	1720	772	145
17	71	80	494	1830	1570	3830	3550	4580	12100	1460	1140	141
18	69	82	459	1320	2220	5620	3350	3360	13600	1350	1210	141
19	69	82	446	1190	2480	6660	2930	2930	17500	1280	2120	141
20	69	82	410	1190	2800	7890	2880	2360	18700	1180	1580	140

21	65	96	331	1230	2770	11500	2750	2350	18400	1100	1150	142
22	64	101	372	1270	2690	13500	2390	2550	17700	883	903	143
23	64	90	415	1130	2610	13800	2260	3200	17600	1120	710	133
24	64	84	576	1010	2550	14000	2170	6290	15600	1480	583	130
25	66	84	851	982	2370	13800	1990	6800	14400	996	505	137

26	80	85	821	1020	2170	12700	1750	6800	11800	808	442	143
27	91	93	764	925	2620	10800	1760	7220	9090	814	361	137
28	105	167	841	896	2250	9440	2090	6760	7570	895	307	125
29	102	211	845	1040	---	10700	2080	5720	6480	633	377	121
30	84	848	825	1050	---	11800	2310	4300	6010	522	406	121

31	76	---	797	1000	---	11000	---	3380	---	489	295	---

TOTAL	2379	3641	20312	48105	45868	200560	137050	222240	257880	68160	31920	4873
MEAN	76.7	121	655	1552	1638	6470	4568	7169	8596	2199	1030	162
MAX	105	848	1370	3280	2800	14000	9560	14300	18700	5200	4300	269
MIN	64	69	331	666	716	1500	1750	2350	1780	489	295	121
CFSM	.03	.05	.25	.59	.63	2.47	1.74	2.74	3.28	.84	.39	.06
IN.	.03	.05	.29	.68	.65	2.85	1.95	3.16	3.66	.97	.45	.07

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1908 - 1998, BY WATER YEAR (WY)
MEAN	873	962	1161	1891	2248	2782	3302	3201	2293	1133	533	595
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 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1908 - 1998
ANNUAL TOTAL	414099		1042988
ANNUAL MEAN	1135		2858		1745
HIGHEST ANNUAL MEAN					4808	1927
LOWEST ANNUAL MEAN					114	1954
HIGHEST DAILY MEAN	11600	Mar 3-4	18700	Jun 20	67700	May 19 1943
LOWEST DAILY MEAN	64	Oct 22,23,24	64	Oct 22,23,24	3.0	A
ANNUAL SEVEN-DAY MINIMUM	66	Oct 19	66	Oct 19	3.0	Oct 3 1914
INSTANTANEOUS PEAK FLOW			19000	Jun 20	68700	May 19 1943
INSTANTANEOUS PEAK STAGE			21.85	Jun 20	31.52 B	May 19 1943
INSTANTANEOUS LOW FLOW			63	C
ANNUAL RUNOFF (CFSM)	.43		1.09		.67
ANNUAL RUNOFF (INCHES)	5.88		14.82		9.05
10 PERCENT EXCEEDS	2660		8730		4620
50 PERCENT EXCEEDS	524		1190		665
90 PERCENT EXCEEDS	82		82		59

A - Oct. 3-15, 1914.
B - From graph based on gage readings.
C - Oct. 22, 23, 24, 25, 26.