05578500 DATA: Discharge Tables, 2002

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 40°06'54", long 89°02'57" (NAD of 1927), in NE1/4SE1/4 sec.11, T.19 N., R.1 E., De Witt County, Hydrologic Unit 07130009, on right bank at downstream side of bridge on County Road 490 E, 0.5 mi upstream from State Highway 54, 0.8 mi upstream from a railroad bridge and Ten Mile Creek, 3.2 mi northwest of Rowell, and at mile 65.3.

DRAINAGE AREA.-- 335 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1942 to current year.
	STAGE: Water years 1994 to current year.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978-91.

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

GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 610.00 ft above NGVD of 1929 (U.S. Army Corps of Engineers bench mark).

REMARKS.-- Flow partially regulated due to storage at Clinton Reservoir, 11 mi upstream from gage since Oct. 12, 1977.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 24,500 ft³/s, May 16, 1968, gage height, 29.21 ft; maximum discharge after Clinton Reservoir, 7,810 ft³/s, Apr. 13, 1994, gage height 24.04 ft; minimum daily discharge, 0.7 ft³/s, Oct. 4, 1954.

REMARKS FOR CURRENT YEAR.-- Records poor.

Discharge, cubic feet per second, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	7.5	23	51	e72	480	484	325	1480	296	134	56	242
2	7.4	23	41	e70	591	580	320	1200	273	122	48	197
3	7.9	21	36	e75	623	725	300	866	255	113	46	160
4	6.5	20	32	e80	598	716	293	669	224	102	36	132
5	14	19	29	85	541	698	275	545	387	95	30	110

6	13	29	28	87	479	681	262	485	461	86	31	90
7	8.5	21	25	82	429	693	244	485	446	72	27	73
8	7.8	18	24	75	378	687	283	465	412	63	20	60
9	7.8	18	23	69	346	868	351	567	379	52	16	52
10	8.9	18	21	68	315	947	368	539	349	49	15	45

11	13	17	21	65	295	1040	365	836	612	48	14	38
12	47	17	21	62	257	940	351	2000	637	38	13	31
13	20	16	27	59	245	811	347	2450	692	30	13	24
14	32	16	28	60	227	722	334	3020	861	28	18	21
15	15	16	33	50	203	631	316	2790	893	23	17	18

16	23	16	43	e49	193	590	296	2420	791	19	47	19
17	18	16	91	e46	187	528	275	2240	663	18	174	16
18	13	15	95	e47	178	458	274	2000	557	17	140	18
19	12	16	90	e48	322	426	265	1610	476	16	145	18
20	11	15	94	49	800	397	306	1230	411	16	165	24

21	10	15	106	47	917	361	481	916	360	16	158	22
22	12	15	119	46	1040	310	426	729	323	29	138	20
23	13	15	124	46	978	281	396	610	289	84	864	17
24	34	20	116	50	850	282	388	553	259	65	1280	14
25	80	21	e108	47	732	348	407	505	234	62	1270	13

26	48	16	e102	42	667	300	367	444	222	52	1210	14
27	35	16	e100	40	578	257	985	400	202	50	876	12
28	29	16	e98	42	528	288	1860	412	185	45	634	12
29	26	20	e90	43	---	302	1380	454	169	46	480	11
30	24	57	e80	62	---	314	1550	372	150	55	378	10

31	22	---	e74	376	---	322	---	324	---	59	301	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1978 - 2002, BY WATER YEAR (WY)
MEAN	113	159	235	213	341	553	491	527	348	223	138	58.5
MAX	1069	1236	1268	1316	975	2129	1704	1648	850	1370	1576	658
(WY)	1994	1986	1983	1993	1982	1982	1979	1995	1999	1981	1981	1993
MIN	8.31	9.77	12.1	11.0	14.9	22.3	54.8	45.2	13.7	8.51	6.57	5.46
(WY)	1989	1989	1996	1980	1989	2000	2000	1988	1988	1988	1988	1988

SUMMARY STATISTICS	FOR 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1978 - 2002
ANNUAL TOTAL	61000.1		108651.3
ANNUAL MEAN	167		298		283
HIGHEST ANNUAL MEAN					601	1993
LOWEST ANNUAL MEAN					56.3	2000
HIGHEST DAILY MEAN	2560	Feb 27	3020	May 14	6960	Apr 13 1994
LOWEST DAILY MEAN	6.5	Oct 4	6.5	Oct 4	3.7	Sep 8 1988
ANNUAL SEVEN-DAY MINIMUM	7.5	Sep 28	9.3	Oct 1	4.1	Sep 4 1988
MAXIMUM PEAK FLOW			3100	May 14	7810	Apr 13 1994
MAXIMUM PEAK STAGE			19.88	May 14	24.04	Apr 13 1994
INSTANTANEOUS LOW FLOW			5.6	Oct 4
10 PERCENT EXCEEDS	431		756		719
50 PERCENT EXCEEDS	54		98		110
90 PERCENT EXCEEDS	9.6		16		11