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. |
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001 DAILY MEAN VALUES |
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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 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |