07020500 DATA: Discharge Tables, 2004

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. 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. 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: Extremes 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.

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, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	77600	69500	117000	126000	94500	135000	311000	215000	426000	352000	194000	302000
2	79100	70800	119000	132000	95100	130000	316000	226000	411000	340000	189000	269000
3	73400	71500	108000	136000	99200	127000	315000	235000	415000	327000	173000	237000
4	70900	73900	102000	136000	94600	144000	306000	235000	437000	313000	160000	218000
5	71400	83000	103000	167000	89600	180000	294000	232000	445000	297000	159000	196000

6	70500	98400	98700	185000	86900	265000	284000	218000	442000	287000	167000	171000
7	68700	112000	89700	176000	86900	e354000	277000	206000	431000	269000	185000	152000
8	66600	120000	85200	155000	88000	414000	274000	189000	417000	254000	192000	141000
9	65900	119000	84500	137000	86300	407000	270000	179000	403000	257000	178000	130000
10	71200	114000	91500	129000	82900	388000	263000	167000	393000	257000	165000	123000

11	82200	111000	121000	125000	82400	359000	255000	156000	387000	254000	158000	123000
12	76900	107000	179000	122000	83400	320000	244000	146000	378000	250000	145000	119000
13	71300	105000	189000	117000	85200	284000	229000	139000	371000	248000	138000	114000
14	68500	99500	186000	113000	88800	267000	215000	153000	371000	249000	133000	109000
15	68700	91600	169000	110000	89000	251000	202000	177000	368000	257000	123000	106000

16	71400	86500	148000	108000	86000	231000	184000	181000	367000	269000	114000	107000
17	74700	84400	140000	109000	83500	219000	162000	178000	381000	270000	107000	113000
18	84600	110000	135000	120000	80100	217000	156000	176000	403000	258000	109000	122000
19	86600	174000	138000	124000	78500	209000	150000	178000	422000	243000	108000	125000
20	81100	180000	139000	129000	79800	209000	148000	196000	422000	234000	104000	128000

21	71900	174000	130000	131000	84100	210000	143000	229000	416000	236000	106000	125000
22	68900	168000	121000	130000	97600	208000	147000	247000	410000	232000	114000	121000
23	73800	159000	117000	131000	108000	200000	148000	273000	402000	224000	114000	124000
24	74900	157000	130000	123000	120000	187000	152000	277000	397000	213000	110000	142000
25	76900	150000	150000	117000	129000	183000	159000	264000	395000	208000	99900	154000

26	77000	136000	159000	116000	132000	178000	168000	288000	393000	202000	113000	157000
27	77600	134000	145000	114000	148000	204000	180000	343000	388000	194000	165000	153000
28	76400	136000	132000	109000	151000	264000	185000	408000	382000	187000	212000	147000
29	73600	133000	131000	100000	140000	304000	189000	449000	374000	188000	295000	143000
30	e72500	123000	136000	92900	---	304000	206000	455000	363000	189000	313000	135000

31	71500	---	128000	94300	---	299000	---	445000	---	198000	305000	---

MEAN	74070	118400	129700	126300	98290	246800	217700	240600	400300	250200	159600	150200
MAX	86600	180000	189000	185000	151000	414000	316000	455000	445000	352000	313000	302000
MIN	65900	69500	84500	92900	78500	127000	143000	139000	363000	187000	99900	106000
IN.	0.12	0.19	0.21	0.21	0.15	0.40	0.34	0.39	0.63	0.41	0.26	0.24

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1942 - 2004, BY WATER YEAR (WY)
MEAN	149200	155800	139600	130200	159500	248800	329600	324700	289200	242700	160100	146000
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 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1942 - 2004
ANNUAL MEAN	137300		184400		206200
HIGHEST ANNUAL MEAN					441700	1993
LOWEST ANNUAL MEAN					96770	1956
HIGHEST DAILY MEAN	426000	May 13	455000	May 30	1000000	Aug 6 1993
LOWEST DAILY MEAN	57200	Jan 16	65900	Oct 9	37600	Jan 1 1964
ANNUAL SEVEN-DAY MINIMUM	61300	Jan 27	69300	Oct 4	38500	Dec 20 1963
MAXIMUM PEAK FLOW			457000	May 30	1000000	Aug 7 1993
MAXIMUM PEAK STAGE			29.35	May 30	49.74	Aug 7 1993
INSTANTANEOUS LOW FLOW			65500	Oct 9	30000	Dec 12 1937
ANNUAL RUNOFF (INCHES)	2.63		3.54		3.95
10 PERCENT EXCEEDS	242000		364000		398000
50 PERCENT EXCEEDS	114000		152000		166000
90 PERCENT EXCEEDS	68600		82300		78100