Country= U.S.A. Station= Alton,Illinois River= Mississippi Area= 444185 km2 Lat= 38.88 Lon= -90.16 Source= RivDIS PointID= 387 Area Units= km2 Discharge Units= m3/sec Starting Year= 1927 Ending Year= 1984 Total Years= 58 Total Usable Years= 56 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Avg Annual 1927 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 3737 2010 2520 -9999 1928 2718 3596 3284 5238 3766 3029 3171 2633 3114 3086 4502 3199 3444.67 1929 2491 2350 6937 8806 7022 4162 3851 2152 1472 1500 1897 1217 3654.75 1930 1744 2944 3369 2364 2706 3114 2064 1149 1042 1095 1019 1053 1971.92 1931 999 1144 1160 1628 1631 2149 1667 979 1115 1670 2290 3482 1659.5 1932 3369 2559 2860 3851 2944 2707 2064 2120 1172 971 1027 1463 2258.92 1933 2208 1733 2293 5380 5521 3539 1979 1166 860 970 886 781 2276.33 1934 844 916 1086 1978 1321 898 1083 853 1017 1362 1633 2510 1291.75 1935 1940 2247 4202 4493 5176 4595 4442 2197 1367 1086 1866 1282 2907.75 1936 1134 1378 4924 4391 3684 1936 857 632 1519 1694 1528 957 2052.83 1937 2178 2627 4898 3565 4488 3313 2007 1212 911 892 963 831 2323.75 1938 1203 3652 3114 5351 4304 5493 3737 2197 3567 2831 2449 1413 3275.92 1939 1594 2030 4672 5040 3256 2525 2095 1775 869 788 859 945 2204 1940 678 728 1457 2444 1846 2141 1398 1578 1189 881 1166 1472 1414.83 1941 1533 1555 2140 4437 2936 3310 1696 822 2834 5272 5029 2616 2848.33 1942 1803 3967 3839 4420 3740 5442 3964 2513 2652 2676 2910 2507 3369.42 1943 2927 3434 3831 5283 7458 7404 4969 3095 1723 1256 1494 1298 3681 1944 1213 1486 4173 6351 7688 6699 4199 1700 1412 1305 1298 1105 3219.08 1945 1067 1687 4318 7257 5776 6929 3157 2100 2024 2092 1747 1680 3319.5 1946 4853 2586 5598 4652 2925 3970 3352 1762 1628 1735 3429 1693 3181.92 1947 1837 1772 2525 7022 5855 8984 5725 1315 1255 1005 1324 1629 3354 1948 1357 1471 6555 5493 3559 1479 2107 1153 835 711 929 955 2217 1949 2184 3304 4632 4389 2157 1987 2154 1323 933 1189 975 1558 2232.08 1950 3134 2879 4321 5601 6136 4765 2722 1537 1189 989 832 1041 2928.83 1951 1227 2857 4420 7880 7617 4479 6940 3109 2676 2734 3281 2222 4120.17 1952 2865 3007 5116 7050 6419 3468 3412 2987 1495 938 1144 1285 3265.5 1953 1243 2169 3366 4720 3440 3253 3230 2893 1309 876 969 1187 2387.92 1954 1075 988 1568 2959 4431 3899 3426 1673 1666 3276 1843 1496 2358.33 1955 2237 2200 3273 3961 2905 2882 1911 1392 926 1242 1027 1050 2083.83 1956 920 1067 1533 3264 2845 1948 1792 1714 1012 643 991 1004 1561.08 1957 1056 1327 1640 3281 3621 3692 3695 1803 1410 1176 1477 1647 2152.08 1958 1388 1268 2319 2281 1596 2831 3752 2286 1184 840 1189 842 1814.67 1959 822 2594 4128 4459 3284 2547 1992 1520 1680 2993 2237 1875 2510.92 1960 3429 2487 2117 8543 7186 5422 3497 1608 1709 1254 1732 1239 3351.92 1961 1014 1424 4086 4842 4253 2170 1846 1800 2854 2617 4649 2255 2817.5 1962 1911 3097 5179 7931 4811 4349 3078 1867 2291 1815 1347 1154 3235.83 1963 979 934 3771 3004 3168 2020 1538 1274 844 785 852 748 1659.75 1964 791 907 1456 3092 3366 1952 1215 777 1479 935 1063 995 1502.33 1965 1951 2170 4166 8414 8074 4454 2313 1402 4285 3993 2104 2895 3851.75 1966 2594 3424 3879 5165 5324 4030 1917 1350 1079 995 1053 1491 2691.75 1967 1250 1846 2511 6284 3576 4188 3227 1315 1057 1352 2261 2395 2605.17 1968 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 1969 2930 3670 3660 7170 6410 4000 7380 2640 1470 2800 1590 1200 3743.33 1970 1300 1650 2680 4400 6490 5640 1960 2650 3960 3220 3480 2600 3335.83 1971 1730 3020 5570 5280 3510 3010 2330 1250 1020 1230 2140 2690 2731.67 1972 1750 1400 3600 5200 5790 3280 2670 4210 3470 4030 4940 2720 3588.33 1973 4980 4750 7830 11100 11000 7450 3650 2660 2220 4000 2670 3280 5465.83 1974 4020 5000 5600 5680 6920 8900 4990 2150 1410 1130 2010 1780 4132.5 1975 2240 2790 4430 6160 7540 4510 3740 1510 1830 1150 1540 2280 3310 1976 1290 2360 5220 5710 4890 1960 1320 780 598 620 645 662 2171.25 1977 670 1040 1990 2050 2020 976 1080 1610 2830 3590 3070 2260 1932.17 1978 1930 1290 3900 6880 5890 3590 5380 2300 2760 1880 1580 1460 3236.67 1979 1120 1500 6670 10700 8100 3950 3090 3350 2850 1420 2290 1890 3910.83 1980 1741 1670 2966 4341 2087 4706 1646 2492 3849 2462 1657 1702 2609.92 1981 1204 1814 2319 3670 4882 4092 5872 4120 2994 2705 2364 1942 3164.83 1982 1586 3863 7265 8074 6325 5306 5346 2716 2570 2707 4454 7961 4847.75 1983 3852 3719 6484 9862 8108 4684 4621 2336 1859 2059 3138 3342 4505.33 1984 2246 4160 5598 7140 7100 6288 5680 2154 1333 2145 3970 2565 4198.25 Avg 1899.09 2312.63 3866.04 5356.8 4801.3 3937.43 3107.07 1922.52 1815.68 1866.75 2014.37 1847.74 2891.84 Std Dev 994.31 1043.5 1628.14 2160.61 2098.58 1797.67 1521.43 788.92 913.23 1079.11 1135.49 1100.06 893.48