05576000 DATA: Discharge Tables, 1999

Station list Available data
ILLINOIS RIVER BASIN

05576000 SOUTH FORK SANGAMON RIVER NEAR ROCHESTER, IL

LOCATION.--Lat 39°44'32", long 89°34'02", in NE1/4NW1/4 sec.20, T.15 N., R.4 W., Sangamon County, Hydrologic Unit 07130007, on right bank at city of Springfield dam, 100 ft downstream from Horse Creek, 1.7 mi southwest of Rochester, and at mile 7.4.

DRAINAGE AREA.--867 mi².

PERIOD OF RECORD.--July 1949 to current year.

REVISED RECORDS.--WDR IL-75-1: Drainage area.

GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 511.30 ft above sea level. Prior to Oct. 1, 1964, water-stage recorder, and Oct. 1, 1964, to Apr. 12, 1966, non-recording gage, at site 1.8 mi downstream at same datum. Auxiliary water-stage recorder at site 1.2 mi downstream. Prior to May 19, 1950, auxiliary non-recording gage at site 6.2 mi downstream. May 19, 1950 to Apr. 29, 1975, auxiliary non-recording gage at site 1.2 mi downstream.

REMARKS.--Records fair except those for estimated daily discharges, which are poor. Beginning Apr. 14, 1955, diversion above station for Springfield municipal supply during some years. Occasional regulation caused by operation of gate at diversion dam. U.S. Army Corps of Engineers satellite telemeter at station.

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	21	19	62	e35	2190	463	196	1920	311	349	22	9.6
2	21	23	60	e40	2190	430	197	1980	1130	300	20	7.9
3	21	165	58	e36	2180	457	206	1910	1800	287	12	7.2
4	22	304	e58	e33	2140	447	234	1640	2020	256	4.7	8.0
5	21	270	e58	e31	1920	470	238	1370	2210	237	5.8	6.8

6	26	224	e58	e34	1660	489	263	1400	2490	212	37	6.1
7	24	221	e60	e39	2100	404	304	1300	2690	183	13	6.3
8	24	208	e65	e37	3210	356	451	1210	2650	157	13	6.5
9	30	181	e73	e35	3650	367	1020	1220	2380	137	6.5	6.3
10	46	179	e76	e34	4030	386	975	1170	2050	121	4.7	5.5

11	81	190	e75	e32	4580	412	798	1060	1460	108	6.2	5.0
12	57	175	e107	e31	4520	505	678	934	1050	99	4.4	5.2
13	36	211	e145	e30	3920	608	570	1200	1080	89	83	6.0
14	26	250	148	e29	3120	619	457	1390	e1500	97	301	5.3
15	21	238	146	e29	2470	577	565	1330	e1800	110	208	5.2

16	17	205	138	e35	1950	536	1490	1270	e1940	88	17	5.2
17	16	175	105	e55	1530	499	2240	1340	e2050	70	10	5.2
18	15	150	67	e90	1290	444	2420	1440	2060	60	19	4.9
19	14	132	51	e160	1080	390	e2630	1310	1850	55	7.0	5.1
20	15	119	45	e230	897	341	e2840	1140	1460	51	115	5.2

21	15	106	44	285	756	314	e2950	899	981	47	29	4.8
22	16	96	43	661	653	297	2770	697	696	42	18	4.5
23	16	89	43	1740	581	285	2330	619	585	39	19	4.1
24	15	82	42	2140	589	277	e1960	598	553	37	16	4.1
25	14	77	41	e2250	e512	267	e1650	553	527	33	5.8	3.6

26	13	73	40	e2550	e468	253	e1400	472	485	31	4.2	3.3
27	13	70	39	2930	e453	237	1230	389	531	29	88	3.3
28	13	67	39	3300	e474	223	e1480	335	470	27	29	7.7
29	13	64	e35	3190	---	216	e1710	303	421	26	19	5.7
30	33	63	e25	2690	---	208	e1850	280	366	25	15	1.4

31	22	---	e30	2170	---	199	---	267	---	23	12	---

TOTAL	737	4426	2076	24981	55113	11976	38102	32946	41596	3425	1164.3	165.0
MEAN	23.8	148	67.0	806	1968	386	1270	1063	1387	110	37.6	5.50
MAX	81	304	148	3300	4580	619	2950	1980	2690	349	301	9.6
MIN	13	19	25	29	453	199	196	267	311	23	4.2	1.4
CFSM	.03	.17	.08	.93	2.27	.45	1.46	1.23	1.60	.13	.04	.01
IN.	.03	.19	.09	1.07	2.36	.51	1.63	1.41	1.78	.15	.05	.01

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 1999, BY WATER YEAR (WY)
MEAN	176	257	537	601	881	1041	1077	966	840	390	250	142
MAX	2748	2846	4546	3788	4273	3669	3991	4482	3600	3053	3046	2876
(WY)	1970	1986	1968	1950	1982	1978	1994	1996	1974	1957	1958	1993
MIN	1.06	.67	.19	.75	4.48	13.1	79.0	17.9	3.20	1.74	1.02	1.13
(WY)	1989	1977	1977	1990	1989	1954	1977	1954	1988	1954	1964	1987

SUMMARY STATISTICS	FOR 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1949 - 1999
ANNUAL TOTAL	309953.9		216707.3
ANNUAL MEAN	849		594		595
HIGHEST ANNUAL MEAN					1345	1973
LOWEST ANNUAL MEAN					26.3	1954
HIGHEST DAILY MEAN	5050	Jun 23	4580	Feb 11	19000	Apr 14 1994
LOWEST DAILY MEAN	1.5	Jan 4	1.4 A	Sep 30	.00	B
ANNUAL SEVEN-DAY MINIMUM	5.0	Jan 1	4.0	Sep 21	.00	Jun 9 1988
INSTANTANEOUS PEAK FLOW			4680	Feb 11	20300	Apr 14 1994
INSTANTANEOUS PEAK STAGE			23.81	Feb 11	32.40	Apr 14 1994
INSTANTANEOUS LOW FLOW			.64 A	Sep 30
ANNUAL RUNOFF (CFSM)	.98		.68		.69
ANNUAL RUNOFF (INCHES)	13.30		9.30		9.33
10 PERCENT EXCEEDS	2830		2030		1590
50 PERCENT EXCEEDS	284		179		164
90 PERCENT EXCEEDS	21		7.8		5.5

A - Due to regulation of dam.
B - Nov. 4-6. 1985, Sept. 9, 1987, many days in 1988-90, 1992.