05543500 DATA: Discharge Tables, 2001

ILLINOIS RIVER BASIN

05543500 ILLINOIS RIVER AT MARSEILLES, IL

LOCATION.-- Lat 41°19'37", long 88°43'03", in SE1/4SW1/4 sec.13, T.33 N., R.4 E., La Salle County, Hydrologic Unit 07120005, on right bank 0.5 mi downstream from Marseilles Dam in Marseilles, 6.9 mi upstream from Fox River, and at mile 246.5.

DRAINAGE AREA.-- 8,259 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 1919 to current year. Prior to October 1939, published as "at Morris."

STAGE: Water years 1994-2001.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1975-96.

SPECIFIC CONDUCTANCE: Water years 1975-81.

WATER TEMPERATURE: Water years 1975-81.

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

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

GAGE.-- Water-stage recorder, phone telemeter, and U.S. Army Corps of Engineers satellite telemeter and rain gage. Datum of gage is 462.91 ft above sea level. October 1919 to January 1935, nonrecording gage at site at Morris, 16.6 mi upstream, at datum 478.50 ft above sea level. January 1935 to September 1939, water-stage recorder at site 300 ft downstream from site used 1919-35 and at that datum.

REMARKS.-- Figures of daily discharge include flow through navigation locks. Flow regulated by powerplants and navigation dam above station. Since Jan. 17, 1900, flow has included diversion from Lake Michigan through Chicago Sanitary and Ship Canal.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 95,000 ft³/s, Feb. 22, 1997, gage height, 16.85 ft; minimum daily discharge, 1,460 ft³/s, Oct. 16, 1943 and Nov. 10, 1999.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: A stage of 26.2 ft at Morris occurred in 1831, and a stage of 25.4 ft (ice jam) occurred at present site on Jan. 21, 1916.

REMARKS FOR CURRENT YEAR.-- Records good except those for Oct. 1-Dec. 27, which are fair, and those for 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	3420	2100	5540	3850	18100	29800	6990	7010	11000	4810	4300	7850
2	2050	3010	5330	4090	15700	26000	7270	7000	11900	4730	9970	8510
3	4130	3860	4100	4310	15000	22100	7080	6320	11100	5320	12100	7550
4	8210	2320	5510	3230	14400	18700	6800	6240	10100	5130	7040	6650
5	7430	2720	4810	3450	12300	16700	6540	5550	13600	5450	5970	5540

6	6510	3340	3470	4320	10600	14700	8170	5530	27900	4020	5110	4860
7	5790	5650	3960	3700	11300	13300	8840	6000	36100	6750	4110	5820
8	6650	6510	4520	3400	11700	12700	9230	5300	30600	6400	3160	5150
9	4840	8560	4070	4470	37500	11700	8600	5310	26000	7540	4460	6580
10	4580	12800	4240	4290	61000	10700	9440	5720	22400	6640	5680	5270

11	3830	12600	4690	3010	53700	10600	9650	7190	18800	6530	4640	4500
12	4790	10200	2420	3400	39800	10400	12700	6930	19300	6570	4290	4460
13	3260	9210	4300	4260	31600	9850	13500	8070	15200	5940	4560	4890
14	3710	8660	3680	5020	28700	10200	13900	7750	12800	5130	2730	4280
15	3650	8480	4060	6580	28500	10400	14800	6240	13200	5040	3540	3720

16	3250	7320	2930	7590	26200	12500	14400	6930	10700	4180	4840	3550
17	3510	6980	5110	7830	23600	15300	11500	6870	10100	3960	3830	4120
18	3510	5810	3980	6950	21300	16600	10400	6780	8880	4680	5460	3820
19	2610	5420	3090	6980	18000	16800	9770	6120	8230	4360	6530	9670
20	3550	4200	3880	6920	15900	15400	9760	6020	7940	3950	5270	9410

21	2300	4630	4550	6990	14500	13600	10900	6330	7320	4230	5150	11500
22	2700	4110	4630	5920	13200	11900	12200	6440	7990	6110	3960	10800
23	2920	4660	2170	6020	12200	11500	12100	6390	7190	7130	5560	11600
24	3730	3370	4870	4500	13600	10700	11500	5870	6690	7700	6030	10700
25	2890	4410	4340	5630	35800	10000	11600	7280	5850	10600	10500	8680

26	3590	5400	3250	4490	45600	8920	9300	7810	5790	8800	10700	6920
27	3190	4740	3650	5220	38500	8890	9100	13900	5810	7240	9260	7560
28	2440	4440	4220	4440	33900	7990	8730	12600	5000	6630	8270	7100
29	3690	4090	3480	6470	---	7830	8220	12100	4590	6400	6350	5170
30	2440	4770	4580	10100	---	7030	6840	10700	4530	5590	5990	5870

31	3450	---	3610	16300	---	7710	---	10100	---	5630	10400	---

TOTAL	122620	174370	127040	173730	702200	410520	299830	228400	386610	183190	189760	202100
MEAN	3955	5812	4098	5604	25080	13240	9994	7368	12890	5909	6121	6737
MAX	8210	12800	5540	16300	61000	29800	14800	13900	36100	10600	12100	11600
MIN	2050	2100	2170	3010	10600	7030	6540	5300	4530	3950	2730	3550

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1920 - 2001, BY WATER YEAR (WY)
MEAN	7470	8492	9676	10040	11810	15090	16220	13690	11850	9257	7800	7714
MAX	21050	24180	30100	28430	25970	41290	33180	35180	25940	21020	19220	22770
(WY)	1927	1986	1983	1993	1997	1979	1922	1943	1993	1957	1924	1993
MIN	3169	2278	3739	3186	3264	5153	6516	5649	4346	4687	4242	3345
(WY)	2000	2000	1944	2000	1963	1964	1986	1988	1988	1988	1939	1999

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1920 - 2001
ANNUAL TOTAL	2670520		3200370
ANNUAL MEAN	7297		8768		10750
HIGHEST ANNUAL MEAN					17850	1993
LOWEST ANNUAL MEAN					5583	1964
HIGHEST DAILY MEAN	43800	Jul 11	61000	Feb 10	89600	Feb 22 1997
LOWEST DAILY MEAN	1910	Feb 8	2050	Oct 2	1460	A
ANNUAL SEVEN-DAY MINIMUM	2360	Feb 2	2840	Oct 30	1990 B	Jan 9 1999
MAXIMUM PEAK FLOW			66000	Feb 10	95000	Feb 22 1997
MAXIMUM PEAK STAGE			12.51	Feb 10	16.85	Feb 22 1997
INSTANTANEOUS LOW FLOW			493	Aug 10,11
10 PERCENT EXCEEDS	14000		15100		19300
50 PERCENT EXCEEDS	5180		6540		8960
90 PERCENT EXCEEDS	2910		3550		4500

	A - Oct. 16, 1943 and Nov. 10, 1999.
	B - Period estimated due to backwater from ice.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data