Country= U.S.A. Station= KEOKUK, IOWA River= MISSISSIPPI RIVER Area= 308191.73 Lat= 40.39 Lon= -91.37 Source= USGS PointID= 5474500 Area Units= km2 Discharge Units= m3/sec Starting Year= 1937 Ending Year= 1993 Total Years= 57 Total Usable Years= 56 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Avg Annual 1937 260.86 363.06 296.75 292.42 259.58 104.71 99.61 96.17 91.84 78.85 106.76 94.34 178.75 1938 106.65 81.95 98.84 372.44 120.59 109.91 129.49 116.36 50.43 40.67 44.12 56.47 110.66 1939 85.48 190.74 547.8 207.41 105.98 107.13 64.25 89.56 90.61 61.39 51.83 56.83 138.25 1940 138.92 225.12 217.02 176.55 94.91 74.12 153.33 105.7 65.11 48.48 61.91 94.94 121.34 1941 151.36 109.64 160.87 146.98 70.47 54.52 152 73.74 45.8 54.38 44.14 104.47 97.36 1942 350.93 219.02 458.74 351.98 103.36 92.8 72.79 77.83 58.32 60.29 70.49 103.24 168.32 1943 307.31 338.17 365.67 315.99 210.18 129.73 106.14 78.03 51.12 45.59 57 64.25 172.43 1944 160.38 179.11 494.18 752.85 373.42 103.6 88.01 70.66 73.38 65.4 54.84 75.12 207.58 1945 98.58 142.06 231.52 114.71 223.76 73.11 99.02 117.77 74.45 63.68 68.99 138.29 120.5 1946 503.86 255.23 253.6 286.49 231.72 163.89 103 94.99 73.27 72.96 71.74 66.48 181.44 1947 154.44 215.4 386.9 350.53 178.49 115.92 119.91 119.05 78.32 105.47 315.52 423.09 213.59 1948 305.75 478.56 528.52 575.82 133.44 106.61 140.64 116.37 68.46 87.97 93.8 681.67 276.47 1949 320.42 372.11 277 216.04 225.56 130.06 138.62 153.46 161.3 83.88 86.04 92.71 188.1 1950 90.34 97.8 190.74 133.9 78.23 88.14 76.39 67.24 80.69 67.52 65.21 82.95 93.26 1951 120.7 110.89 129.51 185.65 97.9 52.73 70.51 82.9 47.95 47.55 64.81 118.05 94.1 1952 172.72 215.97 474.01 317.87 124.31 107.95 50.43 48.48 63.51 54 50.4 62.92 145.21 1953 163.33 241.36 344.01 267.94 366.18 86.35 121.6 87.53 101.79 182.37 69.74 265.54 191.48 1954 251 149.79 137.7 127.2 72.8 52.21 47.12 41.51 33.37 25.11 25.77 40.28 83.66 1955 82.79 134.81 91.14 167.96 72.52 56.38 58.06 68.16 115.58 54.18 43.3 56.56 83.45 1956 54.64 203.4 232.14 235.07 119 61.66 96.26 54.95 52.3 121.63 62.01 71.5 113.71 1957 167.7 147.36 179.1 302.66 265.01 151.16 101.81 80.37 69.89 115.12 104.48 284.21 164.07 1958 169.44 257.32 442.12 372.84 193.72 98.6 130.24 79.87 48.93 46.63 41.14 49.1 160.83 1959 73.56 298.13 384.3 237.91 106.33 187.75 73.82 57.24 56.87 73.57 100.66 103.53 146.14 1960 162.88 504.48 338.57 528.6 134.64 80.47 72.21 67.77 51.05 58.4 46.55 51.85 174.79 1961 63.31 89.09 453.88 427.4 218.48 101.95 115.91 75.96 102.21 48.57 42.19 116 154.58 1962 196.52 191.58 416.63 416.49 126.29 94.44 72.98 64.01 50.43 63.92 58.74 80.66 152.72 1963 175.04 350.56 292.18 166.35 158.93 156.64 246.61 93.93 52.01 61.66 47.84 120.01 160.15 1964 386.16 462.45 578.95 561.24 444.81 100.16 187.44 211.88 100.93 191.73 93.84 179.9 291.62 1965 316.5 419.45 377.76 312.83 107.27 146.97 113.39 97.71 72.73 116.96 71.86 93.69 187.26 1966 250.01 393.71 716.04 164.2 201.56 229.98 103.89 118.06 62.96 85.71 140.52 106.26 214.41 1967 372.39 264.43 192.88 100.88 100.89 100.47 127.32 95.37 105.97 58.13 78.35 150.37 145.62 1968 207.51 119.87 161.92 127.9 102.68 90.97 79.44 57.53 43.01 47.92 66.66 87.92 99.44 1969 111.94 147.58 183.05 179.42 200.69 98.64 62.74 149.24 106.27 66.99 65.84 91.1 121.96 1970 124.7 164.49 248.13 454.26 116.24 117.93 75.93 132.89 76.33 54.3 83.83 89.9 144.91 1971 220.94 270.21 570.21 302.89 223.67 100.53 115.46 187.18 99.97 73.85 73.79 225.11 205.32 1972 392.44 410.56 217.95 157.82 98.55 87.54 97.61 73.98 45.31 36.19 55.75 167.14 153.4 1973 323.65 535.87 294.5 493.93 244.69 265.06 119.56 112.72 65.89 67.19 56.47 84.37 221.99 1974 174.6 397.4 217.13 274.21 100.24 95.63 66.37 101.21 92.84 47.6 49.05 89.66 142.16 1975 236.55 346.62 628.15 540.29 257.03 198.3 163.56 165.05 102.93 135.57 101.75 110.28 248.84 1976 179.81 210.59 261.33 169.12 243.3 191.18 122.06 72.14 66.67 107.83 106.77 303.59 169.53 1977 336.76 170.36 390.3 293.49 90.14 62.4 50.11 79.62 66.92 61.38 125.07 104.33 152.57 1978 237.15 462.51 244.38 148.23 226.76 81.74 55.62 87.78 47.91 41.12 37.37 68.4 144.91 1979 122.38 275.9 466.18 304.22 199.84 94.91 87.97 61.55 76.67 99.18 90.29 99.7 164.9 1980 122.81 198.16 497.31 500.37 148.18 149.87 72.45 48.43 42.62 48.19 48.3 54.62 160.94 1981 52.36 172.58 129.34 198.46 56.08 51.24 35.2 40.87 33.44 30.15 34.19 49.37 73.61 1982 271.85 338.51 191.61 188.19 172.64 128.37 91.56 94.24 55.79 54.43 63.32 161.7 151.02 1983 259.26 394.44 432.06 468.1 148.02 91.19 71.36 53.84 60.89 50.32 67.14 317.62 201.19 1984 294.82 289.28 361.62 288.17 239.76 124.53 95.29 240.74 63.04 49.66 60.47 81.98 182.45 1985 87.54 249.14 131.14 85.53 85.01 50.13 56.16 93.1 58.56 57.73 104.01 185.86 103.66 1986 121.66 206.06 144.41 86.99 42.91 39.96 30.39 32.21 46.37 31.57 68.81 212.15 88.62 1987 405.31 376.35 403.3 225.51 99.95 79.72 86.51 43.07 39.6 28.6 33.89 48.18 155.83 1988 105.42 168.39 163.01 121.99 85.32 36.01 27.73 27.64 74.03 56.44 56.14 63.75 82.16 1989 73.98 66.29 138.36 207.16 103.59 106.76 189.16 99.19 57.25 168.24 73.93 170.47 121.2 1990 315.39 314.27 417.49 198.43 99.8 67.62 47.82 49.45 51.56 55.68 60.44 63.08 145.09 1991 191.58 339.19 384.12 231.85 207.5 114.59 162.03 153.09 82.04 47.55 49.55 64.53 168.97 1992 165.02 281.87 291.13 180.89 65.52 104.63 75.07 104.22 154.42 132.93 166.41 375.89 174.83 1993 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 Avg 202.67 260.88 318.88 278.83 160.33 106.24 97.68 92.21 70.75 71.29 73.82 133.14 155.56 Std Dev 104.79 117.32 148.8 144.35 83.44 45.29 42.4 42.24 26.33 36.36 42.21 111.91 46.46