Country= U.S.A. Station= GARRISON DAM, N DAK. River= MISSOURI RIVER Area= 26235406.52 Lat= 47.38 Lon= -101.39 Source= USGS PointID= 6339000 Area Units= km2 Discharge Units= m3/sec Starting Year= 1911 Ending Year= 1991 Total Years= 81 Total Usable Years= 80 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Avg Annual 1911 74.17 73.34 135.92 299.5 642.43 1515.15 812.61 345.09 227.56 163.72 133.37 79.21 375.17 1912 70.79 83.82 82.88 257.1 637.22 737.85 555.93 347.02 253.15 181.57 172.43 93.77 289.46 1913 78.77 85.01 88.18 321.26 762 1465.22 573.92 367.3 271.26 205.62 157.58 105.74 373.49 1914 120.53 88.61 121.68 324.48 869.42 1048.48 718.16 284.68 208.35 226.6 242.7 120.84 364.54 1915 92.62 79.1 100.32 320.97 553.64 599 584.52 330.97 193.72 174.94 153.61 109.91 274.44 1916 81.93 104.38 204.97 362.01 665.81 1686.56 1296.19 430.42 318.77 183.59 141.72 99.96 464.69 1917 88.35 73.91 74.19 167.49 730.3 1210.17 801.74 307.72 190.7 143.55 108.44 115.56 334.34 1918 155.04 100.7 121.27 302.78 645.35 1248.87 493.9 295.36 193.96 179.87 132.1 110.42 331.64 1919 173.58 97.21 101.93 333.1 1011.46 1065.85 508.24 301.32 179.27 118.56 100.53 69.94 338.42 1920 70.51 63.43 95.71 152.94 488.3 991.57 1023.8 352.3 250.78 249.75 156.59 114.12 334.15 1921 101.34 130.87 150.24 298.77 996.58 1406.22 611.74 298.51 166.43 151.78 138.05 131.55 381.84 1922 64.03 80 88.3 142.83 675.08 1168.83 412.3 241.08 169.85 124.47 102.12 82.03 279.24 1923 101.05 68.61 82.83 256 780 1419.25 600.41 264.63 167.76 120.01 93.74 86.13 336.7 1924 71.93 85.2 80.06 122.73 688.72 528.96 332.78 249.4 157.23 122.33 137.9 139.04 226.36 1925 117.52 176.41 123.46 504.04 1208.95 1028.47 490.8 259.59 175.51 127.65 94.7 79.04 365.51 1926 67.83 68.76 78.72 272.08 431.51 347.64 259.9 144.82 234.85 267.69 166.52 127.43 205.65 1927 107.89 96.08 94.03 216.06 626.35 1485.98 770.22 325.65 438.91 361.64 272.14 213.66 417.38 1928 140.01 123.13 150.51 260.09 1326.51 924.93 720.35 261.51 153.99 180.22 110.79 83.38 369.62 1929 69.57 77.22 84.24 118.78 600.59 1072.93 411.57 221.18 143.09 105.91 70.79 79.9 254.65 1930 68.54 87.36 83.02 353.14 598.58 997.51 535.01 244.95 157.03 117.3 94.36 72.38 284.1 1931 76.75 67.36 73.31 111.64 586.66 673.57 338.74 171.51 133.88 97.36 81.03 74.07 207.16 1932 59.09 88.24 125.96 293 961.86 1332.03 509.71 256.73 174.77 133.23 139.72 118.71 349.42 1933 94.6 68.52 91.78 261.75 803.38 1558.85 804.75 315.36 239 263.06 272.69 325.65 424.95 1934 219.61 168.51 220.97 879.53 1283.49 911.24 432.06 222.97 149.13 121.56 175.37 101.66 407.18 1935 104.8 126.55 109.69 217.99 767.12 1138.72 718.61 306.56 164.57 116.14 96.03 78.74 328.79 1936 61.18 48.93 87.88 366.92 889.98 708.4 292.68 164.7 117.64 89.97 68.22 66.27 246.9 1937 49.96 60.93 68.61 126.87 633.44 828.18 441.71 210.26 136.44 127.25 164.43 95.77 245.32 1938 99.51 79.85 101.57 365.37 1018.41 1297.3 513.27 205.31 152.49 131.98 104.07 76.4 345.46 1939 92.34 65.46 104.79 310.63 801.37 684.52 511.08 200.9 140.61 156.18 145.61 113.99 277.29 1940 73.68 77.46 107.83 254.69 799.91 688.58 293.04 169.93 163.4 151.77 109.33 90.01 248.3 1941 78.17 68.45 101.77 248.16 533.09 544.06 269.99 165.98 232.03 236.56 172.05 216.36 238.89 1942 109.65 92.34 87.97 307.5 887.33 1084.16 811.69 333.27 203.86 154.96 126.61 101.55 358.41 1943 78.76 97.14 108.17 645.52 701.17 986.38 865.04 307.13 168.49 142.55 112.32 80.5 357.76 1944 68.6 69.31 71.62 123.66 463.86 611.55 264.65 179.67 143.77 126.63 96.58 64.12 190.34 1945 69.41 67.64 70.13 98.2 566.06 950.88 517.65 204.54 165.13 134.04 128.49 95.76 255.66 1946 87.55 77.4 107.45 368.22 1159.81 1200.07 639.23 272.65 227.9 167.7 113.46 119.46 378.41 1947 91.58 116.93 159.68 418.83 1224.21 1055 546.88 252.49 208.6 387.29 238.34 138.29 403.18 1948 101.92 91.9 97.62 331.69 1388.9 1654.56 573.92 359.29 196.97 150.28 115.24 76.98 428.27 1949 74.04 81.42 114.67 360.57 1021.97 700.47 330.37 212.94 153.72 128.41 139.53 114.19 286.03 1950 80.28 98.35 139.23 268.94 769.24 1515.71 887.69 317.7 180.03 217.92 204.29 195.76 406.26 1951 135.57 207.84 136.1 397.4 1351.18 1119.09 981.41 368.2 302 340.39 202.15 137.26 473.22 1952 135.18 122.01 108.23 509.02 963.14 922.66 563.51 268.02 172.35 128.29 90.65 79.39 338.54 1953 115.68 122.08 97.88 192.74 716.51 1301.54 756.79 297.72 177.59 144.11 128.08 101.19 345.99 1954 70.42 107.11 115.78 237.05 1200.56 1457.66 1230.51 439.55 300.18 197.68 179.8 134.44 472.56 1955 99.12 85.23 82.48 145.27 571.69 1403.39 847.5 305.66 176.57 210.69 207.58 148.67 356.99 1956 126.23 93.02 130.88 480.16 1361.5 1478.34 723.54 299.58 176.53 162.73 121.69 103.4 438.13 1957 65.98 80.44 114.05 206.79 1283.67 939.75 402.01 218.35 148.22 135.08 114.83 88.08 316.44 1958 77.41 85.82 105.41 219.01 1118.58 826.76 446.76 219.3 170.66 157.86 136.41 121.12 307.09 1959 119.78 87.83 108.44 345.55 910.44 1646.82 842.02 340.2 445.24 335.05 248.2 187.71 468.11 1960 113.41 127.49 180.38 444.77 675.13 1188.09 674.31 285.65 191.41 143.26 131.7 90.61 353.85 1961 87.35 128.11 122.76 233.91 1165.38 1742.91 480.02 260.65 188.09 195.23 132.19 97.64 402.85 1962 86.47 117.68 95.63 391.57 719.07 1061.23 508.06 266.44 165.74 151.94 153.19 130.38 320.62 1963 85.44 142.06 119 214.23 729.39 1144.48 739.62 285.88 186.51 146.77 134.75 94.41 335.21 1964 84.71 75.2 77.13 169.51 743.99 1546.96 697.69 290.2 215.6 231.79 161.29 115.83 367.49 1965 110.15 115.29 123 363.43 812.15 1383.19 671.84 316.68 219.8 194.96 160.56 113.58 382.05 1966 103.29 99.75 109.86 332.54 986.08 1275.59 680.61 266.33 168.15 128.86 117.74 109.71 364.88 1967 97.65 106.58 98.5 169.76 831.52 1931.97 842.02 291.01 166.21 141.23 129.48 90.61 408.04 1968 96.86 112.22 141.83 138.9 712.3 1238.02 663.07 281.64 222.81 197.2 166.35 108.68 339.99 1969 100.38 85.09 108.35 545.95 1208.86 1370.83 726.38 263.83 173.58 168.15 121.98 89.13 413.54 1970 69.06 88.46 89.53 120.95 662.05 1001.38 382.93 192.61 150.58 132.92 101.07 87.34 256.57 1971 93.65 161.34 99.76 297.68 1236.9 1381.59 748.66 342.18 188.48 141.49 119.68 84.59 408 1972 78.41 103.1 213.23 222.78 633.39 942.58 596.66 382.8 598.56 914.82 706.6 108.63 458.46 1973 100.5 95.73 103.65 110.08 110.76 133.18 161.74 301.8 550.48 287.64 232.59 86.09 189.52 1974 307.57 523.86 339.85 408.94 559.67 622.97 533.12 364.62 337.6 665.4 529.34 394.06 465.58 1975 453.35 613.27 314.72 162.1 296.78 188.9 112.4 89.88 234.79 342.45 497.34 576.84 323.57 1976 735.24 491.45 387.12 249.19 193.84 174.6 445.89 546.52 324.62 463.39 432.09 411.97 404.66 1977 356.59 281.23 282.58 261.02 164.84 120.33 306.25 225.81 196.34 294.59 471.15 235.47 266.35 1978 304.14 267.48 145.75 135.86 170.57 254.98 371.57 275.8 310.42 364.59 569.74 575.57 312.21 1979 474.34 151.88 135.76 139.54 174.22 139.49 108.31 166.49 219.96 372.19 564.83 445.02 257.67 1980 325.38 198.3 118.41 151.42 155.11 468.3 308.57 222.24 219.84 413.89 469.98 529.67 298.43 1981 567.86 513.45 215.04 124.73 159.72 447.24 796.16 401.1 268.97 372.41 396.04 565.65 402.36 1982 545.77 429.87 280.46 264.83 429.06 222.72 270.65 291.86 243.79 384.75 578.8 476.3 368.24 1983 567.71 469.51 217.67 167.42 223.75 153.31 325.66 286.41 286.79 360.8 343.3 597.4 333.31 1984 537.61 222.84 135.78 146.22 151.71 157.83 296.09 348.98 263.68 366.59 458.68 597.49 306.96 1985 564.18 194.33 123.8 154.21 160.31 134.86 148.93 192.47 320.49 529.53 555.49 376.36 287.91 1986 484.88 141.44 205.26 178.28 145.02 331.88 452.69 254.94 445.5 695.96 610.37 185.83 344.34 1987 318.54 260.75 144.33 149.4 140.97 126.25 237.21 263.99 377 579.49 351.51 258.82 267.36 1988 546.75 415.09 143.29 147.69 128.76 113.65 97.94 119.4 484.55 445.96 478.08 507.73 302.41 1989 252.54 245.12 113.29 169.34 152.05 137.12 147.95 479.25 255.63 482.4 482.19 533.54 287.54 1990 183.05 638.75 378.74 262.79 168 476.59 505.04 306.19 273.42 552.57 331.83 714.36 399.28 1991 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 Avg 168.32 152.05 133.21 268.85 705.98 934.78 548.86 279.05 227.79 242.71 221.29 186.86 339.15 Std Dev 158.87 131.64 67.28 133.22 355.99 481.71 245.76 77.53 94.35 156.48 157.52 164.63 69.47