07020500 DATA: Discharge Tables, 1998

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.

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: Jan. 10-12. 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 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	146000	173000	163000	149000	152000	317000	381000	435000	254000	398000	353000	178000
2	139000	175000	166000	145000	154000	297000	410000	453000	244000	402000	323000	179000
3	139000	173000	170000	145000	151000	277000	456000	467000	246000	420000	303000	165000
4	138000	168000	184000	142000	146000	264000	492000	464000	255000	439000	277000	143000
5	136000	164000	173000	154000	150000	260000	516000	450000	277000	436000	252000	130000

6	137000	170000	175000	180000	167000	256000	532000	428000	292000	423000	254000	129000
7	138000	173000	177000	205000	183000	251000	540000	400000	306000	423000	258000	129000
8	136000	167000	181000	250000	181000	250000	537000	373000	285000	435000	247000	126000
9	136000	164000	179000	321000	173000	272000	523000	356000	266000	442000	241000	119000
10	136000	160000	179000	331000	166000	332000	504000	345000	269000	444000	243000	111000

11	132000	158000	175000	302000	160000	391000	488000	338000	290000	450000	239000	109000
12	133000	157000	167000	260000	169000	407000	487000	333000	310000	450000	233000	110000
13	132000	157000	164000	225000	233000	392000	500000	324000	319000	446000	230000	107000
14	136000	154000	162000	196000	276000	364000	511000	316000	320000	437000	225000	102000
15	135000	153000	158000	182000	269000	334000	515000	311000	343000	425000	215000	104000

16	136000	151000	152000	174000	244000	310000	535000	306000	363000	407000	212000	115000
17	154000	149000	147000	165000	235000	289000	555000	296000	372000	383000	208000	165000
18	168000	148000	147000	165000	241000	310000	571000	280000	391000	355000	189000	238000
19	167000	149000	146000	165000	252000	362000	570000	260000	410000	321000	180000	226000
20	166000	148000	139000	155000	264000	434000	561000	248000	419000	289000	185000	195000

21	165000	147000	140000	151000	260000	481000	545000	253000	426000	270000	188000	175000
22	166000	150000	147000	153000	257000	506000	524000	264000	440000	257000	178000	161000
23	164000	146000	148000	155000	250000	510000	504000	281000	463000	249000	169000	148000
24	165000	144000	149000	156000	245000	498000	483000	294000	483000	239000	155000	141000
25	165000	143000	157000	158000	239000	474000	463000	288000	490000	235000	147000	140000

26	163000	138000	164000	154000	233000	447000	448000	290000	487000	233000	149000	150000
27	162000	131000	169000	152000	243000	418000	433000	307000	476000	230000	152000	154000
28	160000	127000	174000	145000	287000	403000	418000	317000	456000	239000	152000	157000
29	156000	137000	174000	144000	---	388000	410000	307000	429000	301000	156000	156000
30	160000	149000	173000	148000	---	380000	417000	288000	410000	333000	163000	150000

31	168000	---	162000	148000	---	377000	---	273000	---	356000	170000	---

MEAN	149500	154100	163300	183100	213600	362900	494300	333700	359700	360200	214400	147100
MAX	168000	175000	184000	331000	287000	510000	571000	467000	490000	450000	353000	238000
MIN	132000	127000	139000	142000	146000	250000	381000	248000	244000	230000	147000	102000
IN.	.24	.24	.27	.30	.31	.59	.78	.54	.57	.59	.35	.23

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1942 - 1998, BY WATER YEAR (WY)
MEAN	150600	157000	141300	132700	159200	253300	339200	320500	282700	243000	161600	148700
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 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1942 - 1998
ANNUAL MEAN	238400		261400		207500
HIGHEST ANNUAL MEAN					441700	1993
LOWEST ANNUAL MEAN					96770	1956
HIGHEST DAILY MEAN	578000	Mar 2	571000	Apr 18	1000000	Aug 6 1993
LOWEST DAILY MEAN	111000	Jan 18	102000	Sep 14	37600	Jan 1 1964
ANNUAL SEVEN-DAY MINIMUM	116000	Jan 13	108000	Sep 10	38500	Dec 20 1963
INSTANTANEOUS PEAK FLOW	---		574000	Apr 18	1000000	Aug 7 1993
INSTANTANEOUS PEAK STAGE	---		35.09	Apr 18	49.74	Aug 7 1993
INSTANTANEOUS LOW FLOW	---		101000	Sep 14	30000	Dec 12 1937
ANNUAL RUNOFF (INCHES)	4.57		5.01		3.98
10 PERCENT EXCEEDS	417000		454000		399000
50 PERCENT EXCEEDS	184000		233000		167000
90 PERCENT EXCEEDS	137000		143000		77600

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data