05576000 DATA: Discharge Tables, 2000

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.--
SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: July 1949 to current year.

STAGE: Water years 1994-2000.

REVISED RECORDS.-- 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 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.-- Beginning Apr. 14, 1955, diversion for Springfield's public-water supply periodically occurs upstream from the station and upstream from the dam between the confluence of Horse Creek and the gage. Occasional regulation caused by operation of gate at diversion dam.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 20,300 ft³/s, Apr. 14, 1994, gage height, 32.40 ft; no flow Nov. 4-6, 1985, Sept. 9, 1987, and for many days in 1988-90, 92, and 2000.

REMARKS FOR CURRENT YEAR.-- Records fair except those for Mar. 17 to May 28 and 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	20	34	15	5.9	6.3	.03	.00	.00	490	755	88	17
2	7.8	38	14	6.1	7.9	.00	.00	.03	330	475	83	14
3	8.4	39	7.4	6.8	7.4	.03	.00	.00	156	230	66	12
4	8.3	46	1.1	5.2	7.0	.03	.00	.00	65	169	68	10
5	6.1	58	2.8	.96	6.5	.09	.00	.08	5.0	158	77	8.8

6	5.2	51	1.7	21	6.3	.02	.00	.16	5.0	526	310	7.5
7	4.4	48	1.4	11	5.4	.00	.00	.00	13	806	356	6.4
8	7.8	40	1.4	13	4.9	.00	.00	.10	8.9	748	326	5.7
9	8.9	32	1.6	12	4.4	.00	.00	.11	1.6	705	304	5.1
10	14	26	.84	4.8	4.2	.00	.00	.37	1.1	627	253	4.8

11	19	21	.71	2.7	3.9	.00	.00	.18	.74	557	165	4.8
12	18	17	.90	3.5	3.5	.00	.00	.28	.58	454	98	6.6
13	15	15	.97	43	3.0	.00	.00	.11	1.5	396	62	4.9
14	11	13	.75	9.0	2.6	.00	.00	.26	2.9	476	44	11
15	8.9	10	94	8.0	2.6	.00	.00	.36	50	436	33	28

16	12	7.1	14	7.7	2.1	.00	.00	2.1	97	331	26	36
17	12	6.4	9.6	7.1	1.6	e.00	.00	.34	44	223	22	32
18	11	8.4	9.0	7.0	1.8	e.00	.01	.12	2.3	156	21	24
19	9.6	12	8.7	6.9	1.3	e.00	.00	.04	7.1	232	18	19
20	8.4	14	8.7	e6.6	1.3	e.00	.05	.66	2.6	277	16	15

21	6.9	14	8.7	e6.4	1.2	e.00	.00	.70	1010	180	17	13
22	6.5	13	8.2	e6.8	.88	e.45	.00	.24	1340	128	15	11
23	7.5	14	7.8	e6.8	.72	e.50	.00	.01	970	85	13	11
24	5.8	14	8.2	e6.6	.57	.00	.00	.20	1030	61	12	15
25	5.3	12	8.1	e6.2	.37	.01	10	.07	1430	49	23	12

26	5.1	12	7.8	e6.0	.17	.16	38	.65	1580	41	97	3.4
27	14	13	7.5	e5.6	.01	.15	32	.93	1600	34	118	221
28	43	14	7.2	e5.4	.03	.12	3.8	210	1500	30	69	507
29	40	16	6.7	e5.5	.14	.04	.00	623	1320	39	43	643
30	44	17	6.4	e5.7	---	.00	.00	622	1030	48	31	504

31	42	---	6.1	e6.0	---	.00	---	531	---	104	23	---

TOTAL	435.9	674.9	277.27	255.26	88.09	1.63	83.86	1994.10	14094.32	9536	2897	2213.0
MEAN	14.1	22.5	8.94	8.23	3.04	.053	2.80	64.3	470	308	93.5	73.8
MAX	44	58	94	43	7.9	.50	38	623	1600	806	356	643
MIN	4.4	6.4	.71	.96	.01	.00	.00	.00	.58	30	12	3.4
CFSM	.02	.03	.01	.01	.00	.00	.00	.07	.54	.35	.11	.09
IN.	.02	.03	.01	.01	.00	.00	.00	.09	.60	.41	.12	.09

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 2000, BY WATER YEAR (WY)
MEAN	173	252	526	589	863	1020	1056	949	833	388	247	140
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	3.04	.053	2.80	17.9	3.20	1.74	1.02	1.13
(WY)	1989	1977	1977	1990	2000	2000	2000	1954	1988	1954	1964	1987

SUMMARY STATISTICS	FOR 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1949 - 2000
ANNUAL TOTAL	210856.37		32551.33
ANNUAL MEAN	578		88.9		585
HIGHEST ANNUAL MEAN					1345	1973
LOWEST ANNUAL MEAN					26.3	1954
HIGHEST DAILY MEAN	4580	Feb 11	1600	Jun 27	19000	Apr 14 1994
LOWEST DAILY MEAN	.71	Dec 11	.00	A	.00	B
ANNUAL SEVEN-DAY MINIMUM	1.0	Dec 8	.00	Mar 7	.00	Jun 9 1988
INSTANTANEOUS PEAK FLOW			1650	Jun 27	20300	Apr 14 1994
INSTANTANEOUS PEAK STAGE			15.16	Jun 27	32.40	Apr 14 1994
ANNUAL RUNOFF (CFSM)	.67		.10		.68
ANNUAL RUNOFF (INCHES)	9.05		1.40		9.17
10 PERCENT EXCEEDS	2030		260		1550
50 PERCENT EXCEEDS	89		7.5		158
90 PERCENT EXCEEDS	5.4		.00		5.0

A - Many days.
B - Nov. 4-6, 1985, Sept. 9, 1987, many days in 1988-90, 1992 and 2000.