05587450 DATA: Discharge Tables, 2001

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: October 1986 to current year. 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. 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 FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 598,000 ft³/s, August 1, 1993, gage height, 441.96 ft, maximum gage height, 432.15 ft, April, 28, 1973, at Alton; minimum discharge, 7,960 ft³/s, November 7, 1948, at Alton, result of temporary storage in pool of Lock and Dam 26.

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 poor.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	51700	50900	59900	e43000	98500	256000	168000	326000	254000	236000	95300	58200
2	44500	44200	55500	e41000	84900	251000	158000	325000	259000	231000	83400	49600
3	45000	43400	60000	e40000	107000	230000	165000	323000	269000	228000	74400	47600
4	53500	50900	59500	e42000	99100	153000	169000	320000	284000	226000	76000	49000
5	71000	56800	50500	e41000	89700	123000	161000	317000	283000	225000	82800	51900

6	61300	75400	46300	e42000	94400	158000	155000	314000	284000	224000	83900	52600
7	57200	56600	38400	e41000	88100	153000	148000	314000	299000	223000	86800	50900
8	54900	60300	34500	e40000	88300	138000	158000	316000	310000	218000	82400	53500
9	50100	61300	37600	e42000	102000	120000	183000	321000	309000	192000	79800	50400
10	36600	71100	41600	e41000	197000	122000	204000	327000	305000	167000	78800	51600

11	40000	94800	42000	e40000	229000	122000	230000	330000	296000	166000	76900	56600
12	45500	93000	33900	e40000	230000	126000	239000	330000	294000	164000	72700	66900
13	56100	93200	37700	e45000	225000	106000	247000	331000	293000	135000	70800	72700
14	43100	83800	37600	e50000	189000	106000	249000	336000	291000	107000	57400	72600
15	61600	89700	29300	e56000	145000	152000	251000	343000	295000	88000	42800	72200

16	63100	84300	34500	e53000	128000	210000	255000	350000	284000	76800	42100	65500
17	59800	84500	e46000	49400	113000	242000	260000	357000	277000	73900	43000	57700
18	50800	90300	e48000	53000	66300	260000	266000	363000	275000	76200	48700	51900
19	42900	88700	e46000	46400	53500	260000	273000	366000	267000	73700	51200	48200
20	33800	83000	e44000	53400	60500	260000	280000	366000	265000	77300	52800	47000

21	35400	84200	e43000	67900	81700	257000	286000	364000	261000	81700	56600	69400
22	41200	87800	e48000	59400	73600	246000	290000	356000	255000	80900	52900	72400
23	54400	66800	e50000	57500	84100	236000	294000	345000	249000	75500	63600	73700
24	56600	53500	e51000	50200	139000	233000	299000	333000	247000	87300	95200	68600
25	50900	52800	e46000	47200	231000	231000	305000	319000	248000	91600	73500	68800

26	49900	56300	e42000	50600	260000	228000	312000	305000	251000	94700	63300	59900
27	53700	49300	e40000	40500	264000	226000	317000	291000	253000	101000	61600	63000
28	55600	56000	e39000	49500	256000	224000	321000	277000	255000	102000	55700	68300
29	63900	46700	e38000	59500	---	216000	324000	265000	248000	90000	66000	65900
30	65800	54500	e39000	129000	---	190000	326000	257000	242000	95700	62900	63200

31	61800	---	e40000	117000	---	178000	---	254000	---	98100	61500	---

MEAN	51990	68800	43830	52500	138500	194000	243100	323900	273400	135700	67570	59990
MAX	71000	94800	60000	129000	264000	260000	326000	366000	310000	236000	95300	73700
MIN	33800	43400	29300	40000	53500	106000	148000	254000	242000	73700	42100	47000
IN.	.35	.45	.30	.35	.84	1.31	1.58	2.18	1.78	.91	.45	.39

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1987 - 2001, BY WATER YEAR (WY)
MEAN	88960	92750	87140	79410	98170	147300	187300	199000	175800	151200	106100	84110
MAX	334900	171300	169900	161000	158000	217400	342100	333300	273400	469300	416900	309900
(WY)	1987	1987	1993	1993	1999	1997	1993	1993	2001	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 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1987 - 2001
ANNUAL MEAN	86360		137500		124900
HIGHEST ANNUAL MEAN					250700	1993
LOWEST ANNUAL MEAN					53860	1989
HIGHEST DAILY MEAN	291000	Jun 29	366000	May 19	596000	Aug 3 1993
LOWEST DAILY MEAN	29300	Dec 15	29300	Dec 15	20100	Dec 14 1988
ANNUAL SEVEN-DAY MINIMUM	34500	Jan 20	36700	Dec 10	23600	Dec 12 1988
MAXIMUM PEAK FLOW			367000	May 19	598000	Aug 1 1993
MAXIMUM PEAK STAGE			25.19	May 19	441.96	Aug 1 1993
INSTANTANEOUS LOW FLOW			29300	Dec 15	20100	Dec 14 1988
ANNUAL RUNOFF (INCHES)	6.86		10.90		9.90
10 PERCENT EXCEEDS	196000		299000		248000
50 PERCENT EXCEEDS	64300		84100		96500
90 PERCENT EXCEEDS	39000		43000		43800