Country= U.S.A. Station= GREAT FALLS, MT. River= MISSOURI RIVER Area= 25976424.46 Lat= 47.57 Lon= -111.06 Source= USGS PointID= 6090300 Area Units= km2 Discharge Units= m3/sec Starting Year= 1942 Ending Year= 1995 Total Years= 54 Total Usable Years= 46 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Avg Annual 1942 29.71 33.05 123.29 129.13 67.29 108.64 105.04 323.8 368.31 319.49 195.68 44.8 154.02 1943 28.59 44.82 301.71 324.29 65.95 139.2 94.25 361.25 525.85 535.1 416.17 375.98 267.76 1944 233.56 140.87 90.27 99.42 45.34 75.45 97.25 449.87 356.02 397.35 363.87 316.15 222.12 1945 319.71 47.38 87.59 55.64 38.32 38.69 36.04 217.47 470.16 438.37 173.34 45.49 164.02 1946 38.64 39.44 110.91 65.6 66.91 76.72 164.33 449.67 447.6 333.76 73.8 91.25 163.22 1947 115 50.57 151.91 513.2 395.34 326.31 335.51 677.78 713.21 703.91 387.66 238.41 384.07 1948 146.7 140.51 149.26 330.74 355.8 310.48 687.83 716.42 752.95 809.04 416.54 203.21 418.29 1949 194.75 211.67 175.47 294.07 254.83 114.43 356.18 623.16 575.4 474.36 178.83 149.68 300.24 1950 118.38 84.75 75.73 336.98 253.43 146.85 143.56 492.08 541.61 571.55 353.03 195.11 276.09 1951 205.44 207.93 173.46 479.31 374.6 162.18 181.71 559.85 682.82 777.26 635.34 280.89 393.4 1952 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 1953 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 1954 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 1955 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 1956 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 1957 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 1958 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 1959 178.49 192.56 327.75 276.21 226.48 239 237.54 214.53 222.38 225.53 211.76 203.97 229.68 1960 174.38 204.96 517.56 310.26 216.54 197.82 206.47 223.01 204.14 207.36 206.84 215.48 240.4 1961 224.34 234.93 233.57 221.06 218.97 224.34 327.35 202.85 277.38 344.13 261.58 251.47 251.83 1962 305.91 331.01 345.74 304.61 124.52 233.36 274.26 178.92 135.5 110.02 143.87 225.27 226.08 1963 192.37 292.17 283.86 149.27 118.12 178.26 156.89 108.24 130.29 127.96 112.56 227.08 173.09 1964 321.35 287.17 124.14 131.27 208.08 149.49 148.69 147.5 201.01 178.52 120.26 278.79 191.36 1965 345.83 362.86 338.8 415.22 516.56 431.17 476.09 432.88 443.54 431.7 424 358.79 414.79 1966 274.95 381.88 440.56 410.97 419.37 306.38 248.16 187.4 170.66 152.56 256.29 325.97 297.93 1967 322.08 365.69 383.83 516.31 484.49 416.35 304.6 332.5 357.17 350.4 373.5 302.49 375.78 1968 350.86 398.39 403.2 210.08 190.13 189.9 323.93 296.89 331.06 366.36 365.19 318.47 312.04 1969 358.99 408.88 407.49 603.34 418.07 271.68 344.5 368.3 325.91 304.66 337.82 320.92 372.55 1970 317.42 434.67 301.62 367.44 407.63 471.86 428.41 406.85 415.22 379.22 359.63 317.42 383.95 1971 406.12 465.71 460.56 474.03 418.82 377.42 300.08 318.3 270.12 242.24 234.09 243.56 350.92 1972 357.34 402 488.79 422.02 395.25 386.83 262.07 310.39 263.99 250.74 254.45 275.86 339.14 1973 318.67 377.12 419.88 251.33 182.74 180.65 188.98 217.16 212.11 117.38 102.06 216.76 232.07 1974 243.66 303.3 318.89 318.03 218.99 340.27 317.71 366.2 362.84 319.25 312.2 268.72 307.5 1975 322.45 382.68 363.19 345.47 511.26 754.74 1049.01 572.46 422.96 411.14 420.32 361.73 493.12 1976 395.89 494.08 585.98 511.97 418.28 666.77 486.78 412.88 418.05 357.18 422.49 302.72 456.09 1977 359.63 451.25 313.15 183.55 171.2 197.09 251.85 231.95 201.64 162.08 189.74 290.39 250.29 1978 350.22 426.98 401.46 545.76 272.04 337.35 345.76 385.84 425.04 398.17 370.95 337.98 383.13 1979 372.87 439.72 466.5 929.84 742.45 420.41 413.43 377.32 262.25 233.1 221.56 291.85 430.94 1980 338.62 377.1 323 223.07 198.12 254.31 368.85 380.45 358.97 278.81 264.4 285.09 304.23 1981 351.04 359.63 325.76 226.53 295.86 392 405.39 402.74 399.65 346.38 324.52 340.44 347.49 1982 384.38 419.6 492.72 575.31 357.98 494.32 382.19 279.19 225.71 215.47 224.61 327.22 364.89 1983 377.71 395.93 288.72 211.6 220.53 200.89 285.58 285.07 245.9 182.12 234.5 331.86 271.7 1984 379.08 392.53 289.79 214.43 269.44 282.24 256.16 289.25 268.02 284.45 331.13 349.4 300.49 1985 378.63 400.48 255.24 276.66 369.58 321.4 276.32 263.7 213.27 197.38 204.97 333.41 290.92 1986 407.86 409.08 396.05 218.32 281.44 249.02 248.34 220.74 214.18 357.68 200.58 196.76 283.34 1987 236.4 327.47 260.93 204.09 178.6 206.09 227.84 238.5 189.68 172.26 155.2 295.54 224.38 1988 317.52 340.78 252.75 187.97 195.16 192.34 218.46 211.36 147.91 138.96 235.51 321.9 230.05 1989 334.32 353.96 326.1 247.58 214.37 262.25 256.23 263.83 251.29 293.48 323.95 302.44 285.82 1990 359.9 330.6 220.98 174.06 214.4 221.09 222.22 226.48 228.02 241.61 219.49 212.38 239.27 1991 231.1 226.54 251.96 191.09 238.74 250.45 274.85 218.98 219.51 225.67 142.16 226.84 224.82 1992 233.57 227.32 231.66 230.53 216.21 222.05 215.15 169.52 106.78 96.28 99.45 214.13 188.55 1993 230.19 208.33 211.28 214.87 209.13 206.13 265.37 219.26 148.6 127.24 112.72 197.76 195.91 1994 216.58 200.95 258.42 236.86 354.31 324.41 245.74 247.55 220.95 165 151.27 299.61 243.47 1995 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 Avg 276.11 295.85 298.95 307.81 274.17 272.81 292.24 327.83 324.47 312.01 263.48 263.29 292.42 Std Dev 101.39 129.3 123 164.2 141.09 140.99 161.33 138.58 154.56 164.75 115.35 76.08 83.42