07020500 DATA: Discharge Tables, 1999

LOWER MISSISSIPPI RIVER BASIN

07020500 MISSISSIPPI RIVER AT CHESTER, IL

LOCATION.--Lat 37°54'10", long 89°50'10", in SW 1/4 sec.24, T.7 S., R.7 W., third principal meridian, Randolph County, Hydrologic Unit 07140105, on downstream side of left pier of main truss of highway bridge at Chester, 8.1 mi downstream from Kaskaskia River, and at mile 109.9 above Ohio River.

DRAINAGE AREA.--708,600 mi², approximately.

PERIOD OF RECORD.--
DISCHARGE: October 1927 to current year in reports of the U.S. Geological Survey. Monthly discharge only for some periods, published in WSP 1311. Since August 1873, results of discharge measurements in reports of the Mississippi River Commission.
GAGE HEIGHT: July 1942 to current year in reports of the U.S. Geological Survey. Since May 1891, in reports of the Mississippi River Commission and National Weather Service.

REVISED RECORDS.--WDR MO-76-1: Drainage area. WDR MO-98-1: Extreme outside period of record.

GAGE.--Water-stage recorder. Datum of gage is 341.05 ft above sea level. Prior to Feb. 1, 1962, nonrecording gage 0.4 mi downstream at present datum.

REMARKS.--Estimated daily discharges: Aug. 4-16. Water-discharge records good. Natural flow of stream affected by many reservoirs and navigation dams in upper Mississippi River Basin and by many reservoirs and diversions for irrigation in Missouri River Basin. U.S. Army Corps of Engineers satellite telemeter at station.

EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of June 30, 1844, reached a gage height of 39.8 ft, discharge, 1,050,000 ft³/s, computed by the U.S. Army Corps of Engineers.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	146000	203000	208000	106000	310000	206000	185000	529000	459000	341000	257000	152000
2	148000	202000	195000	108000	342000	195000	178000	540000	454000	381000	262000	148000
3	151000	224000	202000	107000	351000	195000	184000	545000	450000	410000	264000	143000
4	163000	297000	219000	107000	335000	199000	211000	536000	449000	422000	259000	143000
5	162000	373000	219000	110000	316000	203000	209000	521000	453000	413000	248000	139000

6	168000	404000	210000	110000	307000	211000	201000	515000	454000	389000	238000	138000
7	282000	400000	201000	119000	340000	213000	207000	527000	449000	361000	228000	137000
8	382000	377000	211000	121000	393000	210000	211000	543000	442000	341000	227000	127000
9	405000	346000	247000	115000	423000	214000	224000	551000	435000	322000	226000	129000
10	394000	319000	275000	109000	415000	245000	252000	543000	422000	311000	222000	130000

11	372000	325000	258000	107000	390000	292000	294000	514000	410000	311000	215000	124000
12	335000	356000	234000	107000	362000	302000	295000	477000	401000	309000	208000	122000
13	286000	370000	223000	111000	337000	286000	282000	448000	397000	300000	220000	119000
14	241000	369000	209000	115000	326000	273000	284000	418000	395000	288000	223000	117000
15	211000	356000	200000	114000	320000	262000	293000	399000	390000	285000	208000	119000

16	193000	330000	188000	122000	306000	241000	304000	400000	391000	277000	191000	120000
17	186000	304000	182000	136000	288000	233000	354000	409000	395000	268000	182000	121000
18	188000	285000	181000	157000	275000	231000	426000	419000	398000	262000	178000	122000
19	221000	277000	176000	165000	269000	228000	472000	430000	396000	255000	173000	123000
20	290000	270000	176000	170000	270000	239000	495000	447000	388000	251000	166000	123000

21	344000	259000	173000	172000	265000	244000	507000	464000	379000	243000	154000	121000
22	367000	246000	171000	179000	252000	233000	509000	477000	371000	241000	151000	119000
23	357000	240000	163000	212000	235000	218000	501000	482000	366000	238000	150000	120000
24	325000	235000	161000	289000	229000	219000	484000	478000	367000	233000	151000	117000
25	288000	228000	157000	313000	226000	231000	471000	475000	363000	227000	155000	116000

26	256000	230000	138000	304000	214000	233000	475000	478000	357000	229000	158000	115000
27	231000	225000	123000	290000	208000	224000	489000	481000	356000	234000	160000	113000
28	216000	222000	126000	278000	211000	216000	502000	479000	347000	238000	161000	113000
29	209000	219000	126000	268000	---	214000	515000	476000	331000	243000	161000	116000
30	205000	213000	122000	266000	---	201000	520000	470000	324000	249000	163000	133000

31	206000	---	115000	280000	---	188000	---	464000	---	252000	157000	---

MEAN	255700	290100	186700	169900	304100	229000	351100	481800	399600	294300	197300	126000
MAX	405000	404000	275000	313000	423000	302000	520000	551000	459000	422000	264000	152000
MIN	146000	202000	115000	106000	208000	188000	178000	399000	324000	227000	150000	113000
IN.	.42	.46	.30	.28	.45	.37	.55	.78	.63	.48	.32	.20

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1942 - 1999, BY WATER YEAR (WY)
MEAN	152400	159400	142100	133400	161800	252900	339400	323300	284800	243900	162200	148300
MAX	588300	380400	500100	323200	331000	528400	719100	630900	597200	795300	769500	551000
(WY)	1987	1986	1983	1973	1974	1973	1973	1995	1947	1993	1993	1993
MIN	59490	59320	51070	47810	52860	84200	137800	127200	81040	69050	69580	66030
(WY)	1957	1957	1964	1964	1964	1964	1977	1989	1988	1988	1988	1976

SUMMARY STATISTICS	FOR 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1942 - 1999
ANNUAL MEAN	283600		273400		208600
HIGHEST ANNUAL MEAN					441700	1993
LOWEST ANNUAL MEAN					96770	1956
HIGHEST DAILY MEAN	571000	Apr 18	551000	May 9	1000000	Aug 6 1993
LOWEST DAILY MEAN	102000	Sep 14	106000	Jan 1	37600	Jan 1 1964
ANNUAL SEVEN-DAY MINIMUM	108000	Sep 10	109000	Dec 31	38500	Dec 20 1963
INSTANTANEOUS PEAK FLOW			552000	May 9	1000000	Aug 7 1993
INSTANTANEOUS PEAK STAGE			34.04	May 9	49.74	Aug 7 1993
INSTANTANEOUS LOW FLOW			105000	Jan 1	30000	Dec 12 1937
ANNUAL RUNOFF (INCHES)	5.43		5.24		4.00
10 PERCENT EXCEEDS	454000		456000		401000
50 PERCENT EXCEEDS	258000		243000		168000
90 PERCENT EXCEEDS	150000		123000		77900

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data