Country= U.S.A. Station= POLSON, MT. River= FLATHEAD RIVER Area= 44053837.84 Lat= 47.67 Lon= -114.24 Source= USGS PointID= 12372000 Area Units= km2 Discharge Units= m3/sec Starting Year= 1891 Ending Year= 1996 Total Years= 106 Total Usable Years= 105 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Avg Annual 1891 71.67 70.79 130.23 234.07 489.79 686.5 517.47 213.45 113.69 135.99 126.52 117.65 242.32 1892 99.11 113.27 137 131.08 323.96 1133.34 706.7 177.8 142.89 157.85 156.38 113.27 282.72 1893 99.11 84.95 158.37 217.49 531.65 822.42 403.13 150.66 134.21 189.71 166.49 127.43 257.14 1894 99.11 113.27 158.49 383.51 809.87 1125.03 489.85 198.59 160.75 173.07 177.04 133.35 335.16 1895 69.54 99.11 152.53 257.42 477.1 499.51 279.66 111.53 113.71 127.06 114.4 95.45 199.75 1896 70.79 113.27 156.95 152.83 309.62 977.13 404.57 174.35 226.54 198.22 141.58 169.9 257.98 1897 113.27 113.27 164.71 321.03 655.68 508.1 283.62 104.95 93.64 119.56 128.5 113.72 226.67 1898 117.84 131.98 124.73 297.19 638.5 923.32 403.77 133.94 120.21 139.01 126.2 117.56 272.85 1899 103.68 91.52 99.11 293.81 559.31 1029.23 657.23 233.36 155.25 162.5 181.72 138.79 308.79 1900 138.84 125.96 200.5 266.18 645.81 454.96 124.87 76.73 99.6 127.43 120.35 131.54 209.4 1901 97.68 91.52 146.02 176.84 701.35 449.96 166.38 67.3 79.22 99.96 108.2 93.46 189.82 1902 91.32 89 102.65 121.61 468.61 555.58 303.45 95.28 79.4 104.75 120.35 99.11 185.93 1903 113.27 99.11 123.76 209.32 357.33 693.11 310.66 113.26 91.76 129.59 127.43 151.63 210.02 1904 127.43 126.94 166.69 290.65 564.97 645.25 288.12 120.97 92.48 112.03 135.92 134.73 233.85 1905 113.27 111.75 145.81 132.86 165.73 332.31 184.72 89.79 69.85 82.67 108.55 101.39 136.56 1906 95 116.3 134.28 204.37 330.4 500.93 185.12 76.97 99.86 99.96 103.83 99.57 170.55 1907 82.67 129.95 193.42 280.73 452.73 935.03 752.68 227.88 169.3 173.56 155.74 131.99 307.14 1908 122.4 117.17 166.81 278.49 383.9 1518.45 535.37 166.64 165.71 235.67 217.1 159.85 338.96 1909 137.02 154.73 202.77 235.63 436.17 1038.01 369.53 164.3 203.46 202.79 186.42 124.69 287.96 1910 129.62 132.79 334.14 440.05 585.98 362.46 110.53 78.48 119.1 145.72 153.98 130 226.9 1911 89.52 115.8 184.84 200.47 313.81 742.94 260.22 117.43 108.81 148.07 156.22 126.51 213.72 1912 111.9 130.36 154.46 268.42 553.83 824.12 296.31 180.45 176.66 194.5 191.61 129.25 267.66 1913 93.17 108.72 128.8 407.76 608.08 1036.12 371.47 192.29 123.8 218.56 208.55 128.74 302.17 1914 130.44 148.36 204.07 283.91 577.03 673.09 189.02 94.27 111.38 192.32 171.32 127.88 241.92 1915 123.41 183.35 257.26 296.2 408.22 602.87 316.05 211.11 179.95 198.07 176.35 145.51 258.2 1916 112.81 188.94 318.16 279.67 492.53 891.7 659.22 202.64 176.06 181.77 166.97 136.29 317.23 1917 148.34 164.24 198.32 309.41 741.81 1105.59 444.3 127.54 131.59 141.68 173.68 138.39 318.74 1918 165.31 160.51 209.32 253.43 391.23 547.46 162.21 146.44 127.5 146.9 150.75 145.81 217.24 1919 141.69 143.19 176.52 226.03 255.85 155.62 68.9 52.85 58.74 69.11 78.97 78.51 125.5 1920 102.51 131.97 172.85 190.33 553.75 668.19 270.16 119.26 121.89 127.98 159.78 124.35 228.59 1921 113.23 130.12 152.71 270.51 487.34 697.64 211.26 93.52 111.69 113.42 130.92 142.63 221.25 1922 118.49 112.48 173 267.56 586.98 780.18 148.78 119.7 130.44 112.67 136.54 128.82 234.64 1923 126.85 126.88 161.75 304.56 434.43 539.82 258.84 151.25 117.89 125.75 142.07 132.87 218.58 1924 122.53 172.16 153.9 258.23 488.99 277.65 118.87 99.4 105.23 112.63 120.97 118.58 179.1 1925 120.6 138.24 153.5 287.23 508.52 560.77 248.41 121.8 155.01 192.01 198.79 172.97 238.15 1926 141.3 162.78 189.66 352.89 450.19 191.56 159.07 130.1 136.74 142.29 140.29 131.46 194.03 1927 131.6 132.82 168.02 196.16 607.81 1294.37 353.2 178.97 198.5 215.39 209.02 160.96 320.57 1928 144.4 172.32 264.54 290.09 780.91 509.67 319.91 149.99 145.62 151.19 152.54 141.23 268.53 1929 136.56 148.28 158.76 179.11 380.59 448.46 167.31 131.38 142.33 142.79 128.3 134.46 191.53 1930 133 117.56 126.39 347.54 272.76 176.27 94.62 90.93 104.26 107.2 106.19 108.11 148.74 1931 113.7 131.36 137.97 170.41 152.7 153.29 76.21 74.37 82.31 84.81 80.02 69.27 110.53 1932 67.31 73.43 137.48 189.72 312.35 438.25 146.97 117.96 100.92 114.23 114.65 84.95 158.19 1933 99.11 106.19 160.34 178.59 319.71 518.74 127.73 91.96 88.33 91.77 135.48 135.69 171.14 1934 148.2 130.88 141.25 285.22 242.98 201.47 75.43 44.64 53.52 78.79 82.72 82.96 130.67 1935 86.73 83 119.98 127.35 203.46 300.72 93.85 98.1 106.38 108.78 95.67 89.58 126.13 1936 86.41 81.34 97.76 130.19 317.26 226.77 108.18 100.8 104.64 112.45 107.26 102.64 131.31 1937 75.59 70.57 119.98 122.89 126.9 130.02 99.27 79.53 80.41 100.77 87.75 84.5 98.18 1938 78.2 86.18 84.56 116.85 325.94 547.08 350.22 89.38 88.59 107.11 141.7 124.66 178.37 1939 108.25 100.65 177.04 219.37 321.04 258.45 109.85 93.33 92.11 99.98 96.89 91.87 147.4 1940 89.24 85.88 113.98 144.9 234.18 242.53 96.08 90.01 82.68 89.21 93 110.45 122.68 1941 100.78 102.98 119.32 130.37 117.34 225.1 106.92 86.04 110.46 165.07 148.91 151.37 130.39 1942 123.66 124.9 162.32 348.51 421.77 666.3 202.77 96.75 100.57 121.51 146.68 140.86 221.38 1943 132.91 151.7 200.87 419.37 400.18 901.71 336.64 146.88 127.66 137.95 144.11 138.8 269.9 1944 131.79 132.24 152.75 150.67 199.76 560.33 322.02 132.64 122.38 129.38 135.74 133.36 191.92 1945 126.6 132.73 152.82 135.76 219.48 469.31 194.19 99.79 113.22 130.43 130.59 124.91 169.15 1946 135.07 135.31 151.22 222.49 275.16 311.26 163.99 104.72 132.47 162.66 163 178.93 178.02 1947 143.27 137.3 228.69 316.22 561.24 615.8 236.8 115.5 145.21 189.06 168.31 163.69 251.76 1948 152.52 155.14 171.49 322.69 619.59 1038.95 337.44 177.8 152.86 147.09 165.1 134.2 297.91 1949 127.61 135.01 182.04 286.93 399.41 379.59 133.39 89.98 100.89 134.34 146.3 121.78 186.44 1950 111.08 140.98 176.57 171.8 267.71 584.46 291.21 178.5 140.51 177.41 179.24 175.92 216.28 1951 146.98 139.82 193.1 267.54 553.37 540.85 244.59 139.79 160.01 172.48 174.35 142.54 239.62 1952 131.54 166.34 195.9 332.92 617.04 417.35 214.14 130.06 117.97 130.87 152.1 142.38 229.05 1953 156.43 144.94 144.36 142.93 293.77 876.41 220.28 116.96 101.54 101.31 122.31 145.34 213.88 1954 139.73 164.82 145.85 156.13 193.83 254.67 158.64 98.2 96.32 111.06 139.7 136.17 149.59 1955 144.86 135.93 142.97 149.35 208.82 239 194.03 144.26 139.23 164.57 159.93 177.48 166.7 1956 175.75 178.98 177.39 197.11 345.22 400.55 149.5 145.74 141.2 149.9 150.59 155.55 197.29 1957 146.71 175.67 188.54 170.91 224.68 406.33 185.78 145.96 148.42 143.69 148.94 159.91 187.13 1958 168.71 171.46 158.52 192.86 281.82 312.64 228.44 152.63 147.81 153.41 148.82 140.05 188.1 1959 136.17 128.41 150.24 138.39 314.77 474.96 206.54 111.49 88.72 163.62 280.58 329.74 210.3 1960 136.1 127.49 144.15 252.14 356.62 281.36 133.49 136.14 139.41 150.48 143.33 138.36 178.26 1961 146.76 155.94 111.31 101.21 128.52 152.17 128.58 142.02 118.66 112.71 145.2 154.8 133.16 1962 154.01 152.28 172.52 155.75 246.84 397.23 153.23 152.83 160.49 166.77 154.83 136.63 183.62 1963 147.05 216.71 150.24 139.53 250.19 511.12 212.93 134.18 137.85 141.88 150.52 147.95 195.01 1964 148.04 160.33 152.95 148.87 427.06 888.4 351.02 181.2 178.59 179.08 190.89 207.4 267.82 1965 223.7 248.7 235.93 331.93 511.62 654.12 431.61 175.75 238.65 357.07 307.15 200.42 326.39 1966 187.17 174.45 226.44 229.3 255.14 192.15 146.89 134.15 114.47 112.01 113.61 174.47 171.69 1967 207.54 218.38 211.24 182.15 328.45 779 375.01 192.27 156.43 154.6 162.37 169.41 261.4 1968 212.61 218.52 304.41 266.09 325.57 459.49 262.34 190.43 178.1 222.39 214.37 191.28 253.8 1969 219 236.4 293.11 389.26 432.88 405.01 429.15 196.83 157.42 152.56 170.7 190.34 272.72 1970 201.16 208.33 192.28 249.53 551.54 605.98 322.85 205.59 182.11 178.78 207.06 198.72 275.33 1971 232.18 247.84 227.2 312.57 580.96 419.96 327.1 186.82 184.2 203.86 188.56 184.16 274.62 1972 206.96 228.98 242.4 275.45 398.45 468.49 252.03 208.55 208.52 218.45 210.79 197.97 259.75 1973 195.62 194.44 149.45 137.35 184.12 194.7 172.87 120.84 104.16 137.33 172.36 181.35 162.05 1974 201.81 201.79 205.26 246.24 323.33 553.88 277.87 205.45 185.67 149.91 143.18 175.52 239.16 1975 200.37 202.16 224.63 271.29 625.35 857.06 656.12 261.23 227.31 251.04 288.42 273.14 361.51 1976 228.45 224.25 249.12 390.53 720.17 522.73 297.19 225.46 214.78 197.74 202.45 200.69 306.13 1977 201.15 183.27 154.07 184.24 189.38 114.83 104.06 126.32 112.19 142.01 171.84 185.23 155.72 1978 199.7 227.24 311.9 275.01 457 426.27 371.11 215.69 221.61 181.83 202.03 200.06 274.12 1979 214.94 213.19 265.59 277.81 370.4 291.96 164.16 154.52 139.9 127.49 125.76 149.71 207.95 1980 175.52 161.5 167.06 202.95 278.92 647.42 292.31 165.06 125.73 170.12 194.47 210.44 232.62 1981 202.17 212.04 220.35 184.66 552.27 807.7 265.99 178.65 130.99 128.44 152.52 163.99 266.65 1982 204.8 234.73 225.54 256.13 365.69 695.65 448.4 210.52 179.55 206.83 203 188.72 284.96 1983 201.94 197.92 212.31 216.39 327.66 320.07 396.62 210.05 177.93 199.63 254.22 193.15 242.32 1984 217.55 213.1 220.82 253.68 361.2 535.29 354.8 226.34 289.96 239.47 207.24 197.69 276.43 1985 200.05 194.07 181.76 202.57 246 167.66 112.57 127.92 129.51 200.16 212.66 200.14 181.26 1986 192.03 209.99 220.85 239.94 333.65 328.97 193.51 168.01 161.45 147.64 185.84 178.64 213.38 1987 181.21 144.16 137.66 158.43 154.18 117.76 129.58 123.07 122.49 112.64 131.42 126 136.55 1988 138.88 132.23 124.74 131.86 169.19 131.97 112.39 109.65 111.56 101.55 104.03 105.59 122.8 1989 124.92 146.14 203.71 202.54 299.89 211.98 129.37 129.75 126.7 130.77 148.69 162.2 168.05 1990 152.05 176.85 161.11 212.36 208.56 208.22 123.58 140.78 134.83 116.85 121.29 142.63 158.26 1991 168.81 154.68 129.17 148.38 336.39 438.96 236.32 161.88 158.88 144.19 140.91 155.67 197.85 1992 154.47 148.21 131.77 118.37 130.61 129.93 121.2 107.11 108.32 114.66 112.01 115.79 124.37 1993 145.97 143.31 158.04 167.01 360.33 451.94 450.15 298.77 265.47 241.02 230.84 225.16 261.5 1994 223.93 197.13 196.68 250.78 283.87 157.38 124.93 113.1 112 122.76 122.26 124.89 169.14 1995 124.8 144.62 158.23 188.14 473.92 572.95 382.49 199.74 206.02 204.15 206.47 217.14 256.56 1996 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 Avg 141.51 149.25 175.86 231.27 394.29 530.55 261.43 142.84 136.8 150.9 156.1 147.37 218.18 Std Dev 41.93 42.85 48.49 76.76 161.3 291 146.39 48.03 43.3 44.77 42.57 40.2 59.19