05558300 DATA: Discharge Tables, 2000

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 1994-2000.

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 Oct. 7-27, Mar. 10 to Apr. 6 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	9690	4430	e2800	e5300	e3900	14800	7330	15700	23200	19500	10000	6200
2	8380	3360	e2900	e5200	e3800	12700	6040	15700	27600	17500	11100	4710
3	7660	3770	e3700	e5200	e3900	12100	7150	14400	25600	19100	11800	5250
4	9090	3470	5900	e5600	e4300	11100	6080	13600	23000	21500	10400	6180
5	8790	3740	9660	e5100	e3900	11000	5000	12500	21500	27200	8350	5430

6	8800	3750	12000	e5000	e4000	9470	6650	9570	20700	25400	9220	5200
7	7590	4150	10400	e4900	e4000	7540	7730	9860	19100	24200	10800	4830
8	5700	3190	e8400	4800	e4000	5190	6690	8640	18400	22200	11500	4600
9	5600	e3100	e7200	7550	e4000	9350	7110	12100	17300	21000	12100	4250
10	4360	e2900	e8000	6070	e4400	8400	7950	14800	15300	22200	11000	4530

11	4940	e2800	e7200	8120	e5200	8660	7970	14300	16700	34100	10300	4100
12	3920	e2600	e6500	9270	e5000	5710	8380	16700	16900	38100	8660	13000
13	5600	e2900	e5800	7250	e4800	5860	6210	17900	19000	35900	7480	13100
14	4690	e3400	e5900	e6100	e5400	5340	5050	17800	22100	32100	6960	12700
15	3370	e3700	e5400	e5500	e5000	5970	6280	15900	23900	27600	7330	11600

16	4140	e3500	e5200	e5600	e5500	7560	6490	14800	25300	23300	6990	9670
17	3510	e3300	e5900	e5200	e6500	6650	10500	13400	24600	19700	7270	8820
18	4230	e3100	e6400	e4800	7290	6140	11700	13000	22600	18200	8260	6900
19	4010	e3300	e5800	e4400	6390	7040	11600	15900	20000	15700	7950	5840
20	3030	e3600	e5300	e4700	8700	6860	15700	16700	18400	14600	7170	6180

21	2860	e3500	e5100	e4000	7220	8310	25800	16000	21600	15000	6270	7760
22	4520	e3300	e4800	e4400	9330	8270	e30000	16000	25500	13300	5950	6970
23	2670	e3500	4520	e4100	8400	8060	e28000	16700	26400	12600	6980	9060
24	2960	e3800	6260	e4400	12400	6370	e26000	17800	25600	11400	7180	10300
25	3380	e4200	4100	e4600	13800	7810	24300	16600	29400	10400	5990	11100

26	4200	e4000	4830	e4300	14300	5730	22800	15300	33000	8440	5880	9490
27	3600	e4700	4880	e4000	16100	8600	21100	15100	32100	8290	5990	9210
28	3540	6190	3750	e3800	14000	8520	19500	16800	28800	8880	5340	8180
29	3220	6690	3850	e3900	11300	7440	18600	18300	26100	8940	6950	7320
30	3560	e4800	e4600	e4000	---	7880	16500	17900	22100	8490	5870	6610

31	4380	---	e5400	e4100	---	7350	---	17000	---	9190	5780	---

TOTAL	155990	112740	182450	161260	206830	251780	390210	466770	691800	594030	252820	229090
MEAN	5032	3758	5885	5202	7132	8122	13010	15060	23060	19160	8155	7636
MAX	9690	6690	12000	9270	16100	14800	30000	18300	33000	38100	12100	13100
MIN	2670	2600	2800	3800	3800	5190	5000	8640	15300	8290	5340	4100

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1982 - 2000, BY WATER YEAR (WY)
MEAN	9152	12800	15410	14160	16810	23800	23320	19090	17400	13330	9567	9247
MAX	23990	31730	51370	36120	32640	55690	48890	34420	33600	28840	18640	26090
(WY)	1994	1986	1983	1993	1997	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 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1982 - 2000
ANNUAL TOTAL	4859360		3695770
ANNUAL MEAN	13310		10100		15330
HIGHEST ANNUAL MEAN					24470	1993
LOWEST ANNUAL MEAN					10100	2000
HIGHEST DAILY MEAN	50200	Apr 25	38100	Jul 12	111000	Feb 23 1997
LOWEST DAILY MEAN	2600 A	Nov 12	2600 A	Nov 12	2040	Sep 27 1991
ANNUAL SEVEN-DAY MINIMUM	2980	Nov 8	2980	Nov 8	2140	Sep 24 1991
INSTANTANEOUS PEAK FLOW			40400 B	Jul 12	117000 C	Feb 23 1997
INSTANTANEOUS PEAK STAGE			21.11 D	Jul 13	32.02	Mar 7 1985
10 PERCENT EXCEEDS	31100		21500		29800
50 PERCENT EXCEEDS	8020		7330		11400
90 PERCENT EXCEEDS	3380		3790		5780

A - Estimated.
B - Gage height, 20.80 ft.
C - Gage height, 27.19 ft.
D - Discharge, 36,100 ft³/s.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data