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     


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data