05587450 DATA: Discharge Tables, 2002

Station list Available data
UPPER MISSISSIPPI RIVER BASIN

05587450 MISSISSIPPI RIVER AT GRAFTON, IL


LOCATION.-- Lat 38°58'05", long 90°25'42" (NAD of 1927), 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" (05587500) 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 NGVD of 1929. 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 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	56100	85900	89800	54300	122000	106000	94200	293000	231000	183000	94700	119000
2	52700	85500	90600	51300	110000	101000	94600	294000	228000	182000	88600	114000
3	46100	89200	93400	55500	95900	96200	101000	290000	231000	182000	84900	109000
4	44500	87600	97100	61800	84200	94900	104000	282000	226000	177000	84900	103000
5	47900	91900	95500	60500	85100	86700	105000	272000	214000	172000	81000	96000

6	45200	91500	89600	52700	83600	83900	105000	271000	220000	165000	84600	85200
7	51400	86900	87400	49100	83700	91000	110000	292000	231000	157000	86700	77800
8	54700	79400	84700	64200	86400	94000	112000	315000	240000	146000	87200	76300
9	56600	84100	86000	66100	89800	85100	127000	306000	244000	142000	82400	74100
10	51000	82100	92300	59900	85900	111000	162000	291000	e250000	137000	85200	69300

11	47200	83200	98300	55700	88300	130000	180000	273000	261000	137000	85200	76800
12	47600	82600	103000	59100	91600	126000	167000	273000	279000	131000	86000	77700
13	56000	79400	97400	66900	95300	121000	150000	310000	290000	128000	90300	78200
14	55900	77200	99600	60400	98600	119000	151000	350000	e310000	121000	93200	78500
15	61300	76500	102000	55100	92600	119000	146000	374000	e315000	113000	94100	78000

16	61500	75900	103000	63200	86400	126000	146000	372000	e315000	100000	92200	78800
17	88300	73000	111000	60400	86200	125000	153000	365000	307000	96800	96400	83000
18	88800	74300	106000	58000	90700	123000	155000	358000	e290000	92500	91700	79700
19	85000	68800	92900	61400	87300	127000	162000	349000	272000	92200	96400	83100
20	87900	72700	92400	57800	80000	122000	173000	345000	253000	96400	101000	78000

21	83000	74800	92600	50500	82500	117000	191000	338000	237000	104000	96700	72100
22	80800	71800	95100	39500	93500	111000	218000	328000	225000	101000	96500	63500
23	95000	74100	90600	48000	99800	105000	224000	316000	216000	103000	104000	71500
24	103000	80900	75100	47300	102000	109000	224000	302000	208000	104000	146000	68900
25	108000	77700	58900	45400	101000	115000	232000	292000	204000	101000	168000	66500

26	96100	79200	61300	51200	92400	113000	241000	288000	200000	96300	164000	58800
27	92400	74100	47900	52000	95300	111000	245000	289000	189000	95600	159000	51600
28	102000	79600	38200	53600	103000	109000	267000	290000	176000	95800	146000	55000
29	93400	85100	34500	59300	---	109000	283000	285000	175000	92600	130000	60200
30	92900	91000	44900	64600	---	105000	290000	270000	182000	97500	125000	59200

31	94300	---	61700	104000	---	99400	---	249000	---	96300	123000	---

MEAN	71830	80530	84280	57700	92610	109400	170400	307200	240600	123800	104700	78090
MAX	108000	91900	111000	104000	122000	130000	290000	374000	315000	183000	168000	119000
MIN	44500	68800	34500	39500	80000	83900	94200	249000	175000	92200	81000	51600
IN.	0.48	0.52	0.57	0.39	0.56	0.74	1.11	2.07	1.57	0.83	0.70	0.51

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1987 - 2002, BY WATER YEAR (WY)
MEAN	87890	91990	86960	78050	97830	144900	186300	205800	179900	149500	106000	83740
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 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1987 - 2002
ANNUAL MEAN	143600		126900		125000
HIGHEST ANNUAL MEAN					250700	1993
LOWEST ANNUAL MEAN					53860	1989
HIGHEST DAILY MEAN	366000	May 19	374000	May 15	596000	Aug 3 1993
LOWEST DAILY MEAN	34500	Dec 29	34500	Dec 29	20100	Dec 14 1988
ANNUAL SEVEN-DAY MINIMUM	40900	Jan 6	47500	Dec 27	23600	Dec 12 1988
MAXIMUM PEAK FLOW			380000	May 15	598000	Aug 1 1993
MAXIMUM PEAK STAGE			27.66	May 15	441.96	Aug 1 1993
INSTANTANEOUS LOW FLOW			27100	Dec 29	20100	Dec 14 1988
ANNUAL RUNOFF (INCHES)	11.38		10.06		9.91
10 PERCENT EXCEEDS	299000		272000		249000
50 PERCENT EXCEEDS	92900		95600		96300
90 PERCENT EXCEEDS	49600		57900		44600