07020500 DATA: Discharge Tables, 2002

Station list Available data
LOWER MISSISSIPPI RIVER BASIN

07020500 MISSISSIPPI RIVER AT CHESTER, IL


LOCATION.-- Lat 37°54'10", long 89°50'10" (NAD of 1927), 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.--
SURFACE-WATER DISCHARGE AND STAGE
	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.
	STAGE: 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.
SURFACE-WATER QUALITY
	SEDIMENT: August 1980 to current year.

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

GAGE.-- Water-stage recorder and U.S. Army Corps of Engineers satellite telemeter. Datum of gage is 341.05 ft above NGVD of 1929. Prior to Feb. 1, 1962, nonrecording gage 0.4 mi downstream at present datum.

REMARKS.-- 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. Sediment record computed from transport curves.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,000,000 ft³/s, August 7, 1993, gage height, 49.74 ft; minimum discharge, 30,000 ft³/s, December 12, 1937.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 3,380 mg/L, Apr. 13, 1987; minimum daily mean, 13 mg/L, Mar. 18, 1981.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 3,330,000 tons, Feb. 25, 1997; minimum daily, 3,580 tons, Mar. 18, 1981.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: 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.

REMARKS FOR CURRENT YEAR.--Records good.

DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	134000	143000	149000	95000	193000	154000	177000	413000	391000	235000	147000	181000
2	127000	137000	149000	94400	270000	159000	164000	418000	356000	226000	143000	172000
3	118000	135000	149000	88900	271000	164000	161000	411000	338000	221000	135000	163000
4	106000	136000	150000	86500	244000	166000	164000	399000	332000	218000	128000	155000
5	99400	137000	151000	86400	210000	159000	165000	387000	324000	214000	127000	145000

6	104000	139000	148000	91500	188000	142000	165000	370000	313000	210000	124000	134000
7	103000	138000	140000	93500	171000	130000	166000	370000	312000	206000	124000	127000
8	107000	133000	132000	92500	159000	137000	173000	417000	323000	202000	123000	123000
9	112000	125000	128000	93700	147000	157000	182000	495000	332000	196000	122000	121000
10	115000	126000	125000	102000	143000	180000	199000	554000	343000	192000	116000	122000

11	113000	128000	128000	104000	144000	188000	223000	592000	354000	190000	117000	120000
12	116000	125000	135000	100000	141000	199000	231000	616000	378000	189000	118000	119000
13	132000	121000	144000	103000	140000	195000	226000	655000	399000	192000	117000	124000
14	139000	118000	147000	104000	139000	186000	222000	678000	424000	192000	123000	125000
15	141000	114000	155000	105000	143000	183000	221000	698000	445000	186000	130000	125000

16	139000	111000	162000	101000	144000	191000	211000	715000	450000	178000	134000	125000
17	139000	110000	199000	96800	139000	194000	209000	732000	443000	165000	134000	123000
18	140000	108000	223000	98100	132000	190000	213000	732000	428000	156000	138000	126000
19	147000	104000	218000	93500	132000	190000	215000	716000	408000	155000	134000	124000
20	151000	104000	205000	94200	134000	200000	221000	693000	382000	152000	137000	127000

21	157000	102000	190000	93100	131000	196000	238000	659000	351000	152000	155000	130000
22	153000	103000	175000	89900	129000	192000	277000	616000	320000	159000	158000	124000
23	138000	99200	173000	85100	142000	189000	313000	570000	299000	159000	156000	114000
24	147000	96300	169000	85000	153000	181000	316000	524000	280000	158000	160000	112000
25	168000	112000	153000	91400	163000	190000	322000	482000	268000	157000	199000	113000

26	179000	123000	133000	89500	170000	205000	327000	453000	264000	154000	217000	108000
27	167000	118000	129000	87000	162000	198000	324000	439000	256000	150000	214000	102000
28	154000	118000	118000	87100	152000	191000	329000	440000	249000	146000	207000	94600
29	157000	121000	99400	88000	---	192000	356000	449000	242000	144000	196000	89700
30	150000	136000	90300	94600	---	196000	392000	442000	240000	141000	189000	92800

31	145000	---	86900	110000	---	188000	---	422000	---	147000	187000	---

MEAN	135400	120700	150100	94350	163800	180100	236700	534100	341500	178800	148700	125400
MAX	179000	143000	223000	110000	271000	205000	392000	732000	450000	235000	217000	181000
MIN	99400	96300	86900	85000	129000	130000	161000	370000	240000	141000	116000	89700
IN.	0.22	0.19	0.24	0.15	0.24	0.29	0.37	0.87	0.54	0.29	0.24	0.20

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1942 - 2002, BY WATER YEAR (WY)
MEAN	150600	157200	140600	131200	161900	251200	334500	326100	288600	243400	161200	146800
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	129400	127200	81040	69050	69580	66030
(WY)	1957	1957	1964	1964	1964	1964	2000	1989	1988	1988	1988	1976

SUMMARY STATISTICS	FOR 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1942 - 2002
ANNUAL MEAN	235300		201000		207700
HIGHEST ANNUAL MEAN					441700	1993
LOWEST ANNUAL MEAN					96770	1956
HIGHEST DAILY MEAN	590000	Jun 11	732000	May 17	1000000	Aug 6 1993
LOWEST DAILY MEAN	70700	Jan 1	85000	Jan 24	37600	Jan 1 1964
ANNUAL SEVEN-DAY MINIMUM	72600	Jan 1	87600	Jan 23	38500	Dec 20 1963
MAXIMUM PEAK FLOW			738000	May 17	1000000	Aug 7 1993
MAXIMUM PEAK STAGE			40.95	May 17	49.74	Aug 7 1993
INSTANTANEOUS LOW FLOW			82600	Jan 24	30000	Dec 12 1937
ANNUAL RUNOFF (INCHES)	4.51		3.85		3.98
10 PERCENT EXCEEDS	440000		391000		401000
50 PERCENT EXCEEDS	179000		154000		167000
90 PERCENT EXCEEDS	99400		102000		78200