07022000 DATA: Discharge Tables, 2000

Station list Available data
LOWER MISSISSIPPI RIVER BASIN

07022000 MISSISSIPPI RIVER AT THEBES, IL

LOCATION.-- Lat 37°13'00", long 89°27'50", in NW 1/4 sec.17, T.15 S., R.3 W., Alexander County, Hydrologic Unit 07140105, near center span on downstream side of railroad bridge at Thebes, 5.0 mi downstream from Headwater Diversion Channel, and at mile 43.7 above Ohio River.

DRAINAGE AREA.-- 713,200 mi², approximately.

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

DISCHARGE: October 1932 to current year. Monthly discharge only for some periods, published in WSP 1311. Prior to April 1941, published as "at Cape Girardeau, Mo".

STAGE: March 1933 to February 1938 and October 1939 to current year in reports of the U.S. Geological Survey. Prior to April 1941, published as "at Cape Girardeau, Mo". Since November 1878, under name of "at Grays Point" in files of the U.S. Army Corps of Engineers; January 1879 to May of 1896, published as "at Grays Point"; since May 1896, published as "at Cape Girardeau" in reports of the Mississippi River Commission February 1891 to February 1894; and since 1904, published as "at Cape Girardeau" in reports of the National Weather Service.

SURFACE-WATER QUALITY

CHEMICAL: January 1973 to current year.

SEDIMENT: October 1980 to current year.

SPECIFIC CONDUCTANCE: October 1974 to September 1981.

WATER TEMPERATURE: October 1974 to September 1981.

REVISED RECORDS.-- WSP 1341: 1844(M). WDR MO-76-1: Drainage area, WDR MO-98-1: Extreme outside period of record.

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and telemark. Datum of gage is 300.00 ft above sea level. Mar. 17, 1933, to Dec. 21 1934, nonrecording gage; Dec. 22, 1934, to Apr. 4, 1941, water-stage recorder, at site 8.2 mi upstream at datum 4.65 ft higher; Apr. 5, 1941, to Sept. 30, 1941, nonrecording gage at present site and datum; Oct. 1, 1941, to Oct. 11, 1943, at datum 0.07 ft higher. Prior to Apr. 5, 1941, various auxiliary gages used. Since Oct. 1, 1943, former gage at Cape Girardeau used as auxiliary gage.

REMARKS.-- Natural flow of stream affected by many reservoirs and navigation dams in upper the Mississippi River Basin and by many reservoirs and diversions for irrigation in the Missouri River Basin. NASQAN station January 1973 to September 1986. Illinois Environmental Protection Agency station October 1986 to September 1994 (during the period, samples were analyzed by the Illinois EPA). Re-established as a NASQAN station October 1994 to current year.

EXTREMES FOR PERIOD OF RECORD.--
SPECIFIC CONDUCTANCE: Maximum daily, 705 microsiemens per centimeter, Aug. 5-7, 1980; minimum daily, 272 microsiemens per centimeter, Apr. 6, 1979.
WATER TEMPERATURE: Maximum daily, 31.5 °C, July 10 and 11, 1975, and July 17, 1977; minimum daily, 0.0 °C, on several days during winter periods.
SUSPENDED-SEDIMENT CONCENTRATONS: Maximum daily mean, 3,890 mg/L, Dec. 22, 1985; minimum daily mean, 13 mg/L, Jan. 28, 1981.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 6,280,000 tons, Mar. 1, 1985; minimum daily, 2,530 tons, Jan. 28, 1981.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Flood of July 4, 1844, reached an elevation of 345.14 ft, present datum, at Grays Point, from floodmarks, discharge, 1,075,000 ft³/s, computed by the U.S. Army Corps of Engineers.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor.

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	134000	110000	121000	82400	91600	189000	134000	166000	218000	425000	153000	113000
2	149000	111000	117000	86400	88900	191000	140000	169000	198000	413000	154000	112000
3	156000	112000	115000	101000	85100	184000	141000	163000	187000	393000	150000	113000
4	149000	110000	113000	114000	83900	175000	135000	153000	197000	370000	145000	113000
5	140000	107000	112000	113000	89500	179000	130000	148000	205000	347000	145000	105000

6	135000	107000	113000	110000	90800	182000	126000	141000	206000	327000	144000	100000
7	131000	110000	118000	103000	88500	182000	124000	132000	215000	312000	139000	95300
8	128000	112000	122000	102000	89300	174000	127000	143000	220000	301000	134000	90500
9	127000	110000	128000	98600	89800	166000	129000	193000	221000	300000	138000	90300
10	127000	107000	139000	94900	86800	159000	129000	199000	221000	299000	152000	87200

11	122000	105000	137000	99000	83600	154000	126000	164000	225000	291000	170000	89800
12	120000	107000	133000	102000	82100	149000	121000	136000	228000	270000	173000	95200
13	120000	107000	131000	100000	82300	148000	121000	127000	235000	262000	161000	99500
14	121000	111000	135000	98100	84300	147000	120000	130000	239000	264000	147000	99100
15	121000	111000	136000	101000	86200	142000	122000	129000	238000	263000	135000	100000

16	118000	108000	127000	99700	86300	134000	118000	127000	238000	259000	118000	108000
17	117000	106000	121000	97200	85700	127000	113000	127000	272000	258000	111000	112000
18	114000	107000	120000	91400	96500	128000	110000	125000	325000	257000	112000	113000
19	111000	105000	119000	88200	112000	133000	110000	126000	335000	257000	119000	114000
20	109000	106000	114000	88900	126000	143000	108000	126000	329000	273000	127000	118000

21	109000	108000	107000	89100	137000	150000	107000	125000	330000	282000	128000	117000
22	108000	101000	101000	92600	138000	156000	114000	127000	334000	281000	127000	112000
23	108000	97100	89400	89700	129000	153000	127000	136000	340000	274000	125000	107000
24	108000	99000	81600	87100	119000	151000	155000	155000	347000	263000	124000	107000
25	108000	103000	79000	85200	113000	154000	178000	166000	374000	247000	128000	104000

26	107000	110000	80000	83800	115000	151000	176000	171000	395000	227000	141000	100000
27	109000	114000	83000	82000	128000	146000	172000	179000	398000	204000	163000	109000
28	110000	112000	84700	79900	150000	143000	167000	199000	401000	185000	168000	119000
29	112000	115000	82600	87000	175000	138000	164000	238000	416000	171000	151000	122000
30	110000	118000	81100	93200	---	127000	164000	254000	426000	171000	132000	115000

31	109000	---	81600	93500	---	126000	---	235000	---	160000	121000	---

MEAN	120900	108200	110400	94640	103900	154200	133600	158400	283800	277600	139800	106000
MAX	156000	118000	139000	114000	175000	191000	178000	254000	426000	425000	173000	122000
MIN	107000	97100	79000	79900	82100	126000	107000	125000	187000	160000	111000	87200
IN.	.20	.17	.18	.15	.16	.25	.21	.26	.44	.45	.23	.17

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1933 - 2000, BY WATER YEAR (WY)
MEAN	150800	158300	142500	135700	163200	252000	330500	319700	286600	240200	157500	143400
MAX	589600	389000	531700	333300	350400	542000	731000	655800	584100	765500	768000	539300
(WY)	1987	1986	1983	1973	1974	1985	1973	1973	1947	1993	1993	1993
MIN	45500	50080	53850	33650	46920	80260	115600	88170	72350	73290	45000	59890
(WY)	1940	1940	1956	1940	1940	1934	1934	1934	1934	1936	1936	1937

SUMMARY STATISTICS	FOR 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1933 - 2000
ANNUAL MEAN	249400		149400		207200
HIGHEST ANNUAL MEAN					446000	1993
LOWEST ANNUAL MEAN					71730	1934
HIGHEST DAILY MEAN	595000	May 10	426000	Jun 30	978000	Aug 7 1993
LOWEST DAILY MEAN	79000	Dec 25	79000	Dec 25	24700	Jan 21 1940
ANNUAL SEVEN-DAY MINIMUM	81700	Dec 24	81700	Dec 24	26700	Jan 20 1940
INSTANTANEOUS PEAK FLOW	---		429000	Jun 30	996000	Aug 7 1993
INSTANTANEOUS PEAK STAGE	---		31.13	Jun 30	45.91	May 23 1995
INSTANTANEOUS LOW FLOW	---		78200	Dec 25	23400	Dec 13 1937
ANNUAL RUNOFF (INCHES)	4.75		2.85		3.95
10 PERCENT EXCEEDS	476000		257000		403000
50 PERCENT EXCEEDS	227000		126000		167000
90 PERCENT EXCEEDS	109000		89800		75100