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. |
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES |
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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 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |