05558300 DATA: Discharge Tables, 2001

Station list Available data
ILLINOIS RIVER BASIN

05558300 ILLINOIS RIVER AT HENRY, IL

LOCATION.-- Lat 41°06'26", long 89°21'23", in SW1/4 sec.15, T.13 N., R.10 E., Marshall County, Hydrologic Unit 07130001, on right bank 600 ft upstream from bridge on State Highway 18, 4.4 mi upstream from Crow Creek, 38.2 mi upstream from Peoria Lock and Dam, and at mile 196.0.

DRAINAGE AREA.-- 13,543 mi², does not include diversion from Lake Michigan through the Chicago Sanitary and Ship Canal, which has occurred since Jan. 17, 1900.

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1981 to current year. Prior to October 1983, published as station number "05558900."

STAGE: Water years 1994-2001.

SURFACE-WATER QUALITY

SEDIMENT: June 1983 to September 1993.

MISCELLANEOUS: Contaminants in streambed sediments, October 1996; contaminants in fish tissue, October 1996.

GAGE.-- Water-stage recorder, phone telemeter, and acoustical-velocity meter. Datum of gage is 425.88 ft above sea level.

REMARKS.-- Some regulation by locks and dams upstream from station at Starved Rock and downstream at Peoria.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum recorded discharge, 117,000 ft³/s, based on stage-area and velocity ratings, Feb. 23, 1997, gage height, 27.19 ft; maximum gage height, 32.02 ft, Mar. 7, 1985; minimum daily discharge, 2,600 ft³/s (estimated), Nov. 12, 1999.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 324 mg/L, June 11, 1993; minimum daily mean, 19 mg/L, May 2, 1993.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 52,800 tons, June 11, 1993; minimum daily, 1,600 tons, June 2, 1993.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Flood of Mar. 22, 1979, reached a stage of 32.67 ft, from information by the U.S. Army Corps of Engineers, discharge, about 140,000 ft³/s, based on rating curve extended above 32.20 ft.

REMARKS FOR CURRENT YEAR.-- Records fair except those for Dec. 6, Jan. 8, April 5-May 31, June 29-July 17 and estimated daily discharges, which are poor.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	4680	4110	10400	e4400	25800	44900	14500	11800	16700	8220	5880	9370
2	5350	5810	10000	e4400	25200	42000	13000	10600	19200	5710	7700	9230
3	7200	5840	10100	e4400	23500	38300	13300	9690	18700	9460	14300	8460
4	9290	5720	9390	e4400	23500	35800	11300	9140	17800	12700	9710	9180
5	10600	5020	e7500	e4400	21600	32400	10600	7840	23400	10900	7520	7290

6	10500	5090	e5800	e4300	20600	29100	11100	8070	34700	8530	7090	5660
7	9180	6830	e6200	e4300	19500	26800	8050	9370	40900	8870	5920	4490
8	9120	9330	e6500	e4200	19200	25900	14900	7440	42700	9760	4900	5750
9	8220	11900	e6200	e4200	34800	23000	14300	7220	40000	12000	4090	7840
10	6980	16200	e6200	e4200	52300	20400	14000	7390	35900	10400	7710	8080

11	7100	18700	e6200	e4300	65000	21200	13800	10200	32300	10200	4390	6930
12	5950	16800	e4800	e4300	71500	18700	16800	10800	29600	9720	5200	6640
13	4620	15300	e3600	e4500	62300	19800	20800	11200	27100	9790	5630	7700
14	5230	16300	e3900	e4700	55000	19100	20200	10500	24900	8240	3490	6920
15	4710	15000	e4300	e5000	51200	20900	20600	10400	24400	6540	4320	6010

16	5950	15000	e4100	e5700	51500	22100	22100	10300	22000	5580	4720	5140
17	5390	15000	e3900	e6400	46900	23100	21300	9660	19800	6050	4190	4740
18	5650	12800	e4700	e7100	40300	24400	18200	10200	17800	e6800	4990	4560
19	5220	11400	e3800	e8200	37500	25300	16000	9530	19500	6500	7500	9700
20	5150	11000	e4200	e9400	36000	25200	14900	8870	17000	5880	5390	12400

21	5280	10700	e4800	e10000	31200	24100	16300	9500	16100	5410	4940	14200
22	5080	9690	e5200	e9200	26800	22800	17900	9510	16200	6300	4490	13900
23	5250	8380	e5400	e8400	24900	22000	17500	9810	14200	7630	6170	14800
24	5710	8780	e5500	e7300	22300	21800	20300	9060	12500	9820	6680	15200
25	5360	8960	e5300	e6600	35500	20500	18200	9230	12500	11100	8450	13600

26	6000	8480	e4900	e7200	53700	18000	16100	9860	12000	12800	13000	11500
27	6300	9360	e4600	e6500	55900	17500	17300	15000	11600	10300	10600	11300
28	5020	10600	e4400	e6800	49600	15000	14800	17000	11200	8440	11200	10500
29	5210	8880	e4300	e6400	---	16100	14000	16800	10600	8320	9430	8630
30	5410	9690	e4300	15500	---	14900	12900	16100	7470	6470	7840	8260

31	6330	---	e4300	23300	---	14000	---	16800	---	7040	11500	---

TOTAL	197040	316670	174790	210000	1083100	745100	475050	328890	648770	265480	218940	267980
MEAN	6356	10560	5638	6774	38680	24040	15840	10610	21630	8564	7063	8933
MAX	10600	18700	10400	23300	71500	44900	22100	17000	42700	12800	14300	15200
MIN	4620	4110	3600	4200	19200	14000	8050	7220	7470	5410	3490	4490

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1982 - 2001, BY WATER YEAR (WY)
MEAN	9012	12690	14930	13790	17890	23810	22950	18670	17620	13090	9441	9231
MAX	23990	31730	51370	36120	38680	55690	48890	34420	33600	28840	18640	26090
(WY)	1994	1986	1983	1993	2001	1982	1983	1998	1996	1993	1993	1993
MIN	5032	3758	4698	5202	7132	8122	10770	8544	7199	5669	3739	2687
(WY)	2000	2000	1990	2000	2000	2000	1986	1989	1988	1991	1991	1991

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1982 - 2001
ANNUAL TOTAL	3933090		4931810
ANNUAL MEAN	10750		13510		15230
HIGHEST ANNUAL MEAN					24470	1993
LOWEST ANNUAL MEAN					10100	2000
HIGHEST DAILY MEAN	38100	Jul 12	71500	Feb 12	111000	Feb 23 1997
LOWEST DAILY MEAN	3600 A	Dec 13	3490	Aug 14	2040	Sep 27 1991
ANNUAL SEVEN-DAY MINIMUM	3910	Jan 28	4040	Dec 13	2140	Sep 24 1991
MAXIMUM PEAK FLOW			71800	Feb 12	117000 B	Feb 23 1997
MAXIMUM PEAK STAGE			24.77	Feb 12	32.02	Mar 7 1985
10 PERCENT EXCEEDS	21500		25200		29600
50 PERCENT EXCEEDS	8300		9700		11300
90 PERCENT EXCEEDS	4580		4690		5680

	A - Estimated due to backwater from ice.
	B - Based on stage-area and velocity ratings, gage height, 27.19 ft.