05587450 DATA: Discharge Tables, 2000

Station list Available data
UPPER MISSISSIPPI RIVER BASIN

05587450 MISSISSIPPI RIVER AT GRAFTON, IL

LOCATION.-- Lat 38°58'05", long 90°25'42", in NE 1/4 sec.15, T.6 N., R.12 W., Jersey County, Hydrologic Unit 07110009, on left bank 0.2 mi downstream from the mouth of Illinois River, 15.3 mi above Lock and Dam 26, 23.0 mi above mouth of Missouri River, and at mile 218.6 upstream of the mouth of Ohio River.

DRAINAGE AREA.-- 171,300 mi², approximately.

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: Intermittently from 1880 to 1928, computed daily 1928 to 1932 by the National Weather Service and/ or the U.S. Army Corps of Engineers. Discharge previously published as "Mississippi River at Alton, Illinois" for 1927 to September 1986.

STAGE: August 1879 through September 1892, 1929 to September 1986, October 1986 to current year. Stages also available from reports of the National Weather Service.

GAGE.-- Water-stage recorder and U.S. Army Corps of Engineers satellite telemeter. Datum of gage is 403.79 ft above sea level. Auxiliary water-stage recorder 15.3 mi downstream.

REMARKS.-- Natural flow of river affected by many navigation dams in upper Mississippi River Basin. Flood water from Missouri River overtops or breaches the levees at extremely high stages.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Flood of June 1844 reached an elevation of 435.89 ft, present datum.

REMARKS FOR CURRENT YEAR.--Records fair.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	68500	48500	62500	54900	37300	108000	69400	108000	103000	266000	80000	64100
2	61800	38100	54400	59500	36900	99500	61100	99500	120000	252000	76800	59600
3	58800	44300	58800	53700	38200	107000	62400	101000	139000	244000	86400	56800
4	58300	45400	54700	45100	30500	112000	53000	94200	135000	236000	89600	57000
5	58100	47700	58900	49300	36400	113000	63400	86500	150000	231000	83700	50200

6	57500	46600	58000	54300	42800	114000	61600	85300	166000	228000	65300	53500
7	54800	46100	73500	40400	40000	111000	60700	89300	171000	229000	65900	53800
8	56700	40400	69000	44500	42600	107000	52200	77000	173000	228000	79600	49500
9	49000	40700	58900	46100	37100	101000	54900	73700	179000	224000	79200	53200
10	51700	42700	59500	43800	35800	99100	54900	74600	184000	209000	77400	55900

11	57800	41400	66000	39700	32700	103000	56800	80000	189000	174000	77100	58700
12	55600	51900	65300	51800	41400	102000	56400	79600	200000	170000	70700	51000
13	55700	41800	57900	48800	37900	96400	64000	75100	206000	171000	71200	53800
14	56000	43300	55300	47700	38300	93000	56600	77600	208000	173000	52500	62200
15	53300	43000	50700	45400	39000	85700	51500	81000	214000	186000	50700	65400

16	47500	48500	54000	36400	36700	88500	50100	79700	216000	194000	57100	68000
17	44100	45200	60800	42500	46200	92700	50300	79900	220000	203000	61600	71000
18	48400	51100	57100	37800	43700	92800	56100	83800	226000	208000	64800	78800
19	45900	45100	60100	36700	40300	83200	63300	77300	231000	217000	64600	74300
20	48700	40700	46000	34100	40600	77800	47700	74100	234000	214000	70800	64300

21	47100	50500	43500	37000	38700	74700	67800	92100	245000	208000	67100	66800
22	40000	51400	42000	39300	34900	77500	103000	99000	244000	204000	65400	72400
23	46500	40200	43700	31900	39500	77200	121000	106000	237000	201000	69300	58600
24	44400	52100	48300	32900	41900	67600	106000	107000	249000	190000	79200	54600
25	47400	53100	45400	31200	46300	64300	103000	110000	260000	151000	86200	61000

26	48200	46700	41500	35100	74200	60700	106000	109000	267000	121000	75800	72800
27	50900	55900	45200	42100	104000	65500	105000	120000	281000	98000	63300	77000
28	44200	55300	42300	44000	113000	53500	106000	124000	289000	97200	59800	60500
29	48400	58800	45600	45400	113000	63600	106000	116000	291000	89400	52100	60000
30	51500	55900	52000	39100	---	67100	113000	113000	281000	71800	48800	58900

31	45900	---	52700	39600	---	64700	---	111000	---	82100	58600	---

MEAN	51700	47080	54310	42910	47580	87840	72770	93040	210300	186100	69370	61460
MAX	68500	58800	73500	59500	113000	114000	121000	124000	291000	266000	89600	78800
MIN	40000	38100	41500	31200	30500	53500	47700	73700	103000	71800	48800	49500
IN.	.35	.31	.37	.29	.30	.59	.47	.63	1.37	1.25	.47	.40

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1987 - 2000, BY WATER YEAR (WY)
MEAN	91600	94460	90240	81330	95320	144000	183400	190100	168900	152400	108800	85830
MAX	334900	171300	169900	161000	158000	217400	342100	333300	263900	469300	416900	309900
(WY)	1987	1987	1993	1993	1999	1997	1993	1993	1996	1993	1993	1993
MIN	28050	33270	31810	34800	40940	72220	72770	69140	36310	30420	37230	37850
(WY)	1989	1990	1990	1990	1989	1989	2000	1988	1988	1988	1988	1988

SUMMARY STATISTICS	FOR 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1987 - 2000
ANNUAL MEAN	131000		85440		124000
HIGHEST ANNUAL MEAN					250700	1993
LOWEST ANNUAL MEAN					53860	1989
HIGHEST DAILY MEAN	296000	May 4	291000	Jun 29	596000	Aug 3 1993
LOWEST DAILY MEAN	38100	Nov 2	30500	Feb 4	20100	Dec 14 1988
ANNUAL SEVEN-DAY MINIMUM	43200	Nov 8	34500	Jan 20	23600	Dec 12 1988
INSTANTANEOUS PEAK FLOW	---		291000	Jun 29	598000	Aug 1 1993
INSTANTANEOUS PEAK STAGE	---		424.16	Jun 29	441.96	Aug 1 1993
INSTANTANEOUS LOW FLOW	---		30500	Feb 4	20100	Dec 14 1988
ANNUAL RUNOFF (INCHES)	10.38		6.79		9.83
10 PERCENT EXCEEDS	252000		196000		243000
50 PERCENT EXCEEDS	119000		61600		97500
90 PERCENT EXCEEDS	47600		40700		43800