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Last update: Tuesday, 31-Aug-2004 10:29:01 EDT
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Statistics of monthly and annual mean discharges
__________________________________________________________________________________________________________
Maximum Minimum Mean
______________________ ______________________ _____________________________________________
Water year Water year Standard Coeffi- Percentage
Month Discharge of Discharge of Discharge deviation cient of of annual
(ft3/s) occurrence (ft3/s) occurrence (ft3/s) (ft3/s) variation discharge
__________________________________________________________________________________________________________
October 614 1974 6.10 1933 84.2 95.9 1.14 3.97
November 488 1972 9.31 1933 73.5 68.6 0.93 3.46
December 123 1972 6.00 1933 49.8 31.9 0.64 2.35
January 100 1910 4.00 1933 38.3 23.0 0.60 1.81
February 90.8 1994 4.00 1933 35.5 20.2 0.57 1.67
March 747 1945 12.8 1940 129 141 1.09 6.08
April 1,540 1979 73.8 1931 562 419 0.75 26.5
May 2,260 1950 30.9 1977 414 338 0.82 19.5
June 1,560 1943 26.4 1977 306 294 0.96 14.4
July 1,920 1909 8.04 1934 236 332 1.40 11.1
August 1,020 1993 3.02 1932 107 180 1.69 5.02
September 788 1973 2.96 1936 86.7 123 1.42 4.08
Annual 500 1950 22.7 1977 174 102 0.59 100
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Monthly and annual flow duration, in cubic feet per second
______________________________________________________________________________________________________________________
Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
______________________________________________________________________________________________________________________
95 8.90 9.50 15.9 68.1 66.4 38.6 12.3 4.65 3.50 7.63 12.5 7.40 9.37
90 10.7 11.8 20.0 92.5 91.7 55.9 22.9 7.38 6.08 11.9 17.2 12.8 15.6
85 15.1 13.8 23.8 124 122 70.3 31.9 13.0 10.3 15.0 22.0 17.7 20.1
80 16.6 16.9 27.2 146 152 83.3 39.8 18.6 13.6 18.4 25.3 20.1 24.8
75 18.9 19.8 30.6 170 172 99.7 49.7 23.0 17.5 22.4 28.4 21.7 30.1
70 22.5 22.6 34.8 194 194 117 58.7 27.0 21.7 26.9 32.3 25.7 35.9
65 15.3 24.6 39.8 224 218 136 66.3 31.3 25.5 32.0 38.8 30.3 42.5
60 18.8 26.2 45.3 270 244 151 73.9 36.3 30.9 37.2 44.5 35.3 49.3
55 32.1 29.6 51.2 318 276 166 85.6 41.4 35.7 42.9 49.6 39.1 56.8
50 34.7 32.7 56.2 361 312 183 98.4 48.4 42.2 50.3 55.7 43.6 65.5
45 37.7 36.6 61.1 413 351 207 113 56.4 50.4 57.6 62.1 48.9 75.7
40 42.5 39.4 67.1 476 394 238 131 65.3 59.5 68.2 71.0 53.8 90.1
35 46.2 42.7 73.6 549 441 270 157 75.4 69.3 82.8 81.8 58.4 108
30 49.0 46.3 84.3 628 490 309 195 87.3 82.1 100 90.9 63.2 134
25 55.1 49.8 104 784 545 363 239 102 101 116 99.1 68.8 170
20 60.1 53.2 146 922 610 425 306 124 131 133 109 76.7 220
15 64.9 59.7 194 1,080 695 512 393 162 165 153 122 90.2 305
10 69.7 64.6 280 1,280 803 663 526 224 206 184 138 101 461
5 87.2 74.8 528 1,700 1,130 1,010 846 397 301 247 171 118 745
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Probability of annual high discharges
[ng, statistic not given]
__________________________________________________________________________________________________
Maximum average discharge
(ft3/s)
___________________________________________________________
Recurrence Maximum
Exceedance interval instantaneous 3-day period 7-day period 15-day period 30-day period
probability (years) (ft3/s)
__________________________________________________________________________________________________
0.99 1.01 126 101 88.9 80.4 70.3
0.95 1.05 265 218 197 174 148
0.90 1.11 386 321 291 254 214
0.80 1.25 599 498 452 388 322
0.50 2 1,310 1,070 960 797 649
0.20 5 2,680 2,090 1,820 1,460 1,170
0.10 10 3,790 2,870 2,430 1,910 1,530
0.04 25 5,390 3,910 3,210 2,480 1,980
0.02 50 6,690 4,710 3,790 2,880 2,290
0.01 100 8,060 5,520 4,350 3,260 2,600
0.005 200 9,520 6,330 4,890 3,630 2,890
0.002 500 11,600 ng ng ng ng
__________________________________________________________________________________________________
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Probability of annual low discharges
____________________________________________________________________________________
Minimum average discharge (ft3/s)
________________________________________________________________
Number of consecutive days
________________________________________________________________
Non- Recur-
exceed- rence
ance inter- 1 3 7 14 30 60 90 120 183
prob- val
ability (years)
____________________________________________________________________________________
0.05 20 2.46 2.74 2.99 3.42 4.10 5.20 6.79 8.35 9.66
0.10 10 3.76 4.22 4.58 5.15 6.07 7.61 9.70 11.9 13.9
0.20 5 6.12 6.86 7.39 8.17 9.46 11.7 14.5 17.6 21.1
0.50 2 14.1 15.6 16.6 17.9 20.2 24.2 28.6 34.1 43.2
____________________________________________________________________________________
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Probability of seasonal low discharges
_____________________________________________________________________________________
Minimum average discharge (ft3/s)
_________________________________________________________
Number of consecutive days
_________________________________________________________
Non- Recurrence
exceedance interval 1 7 14 30 1 7 14 30
probability (years)
_____________________________________________________________________________________
December-January-February March-April-May
_________________________ __________________________
0.05 20 5.88 6.59 6.89 7.28 9.98 11.1 12.3 19.9
0.10 10 8.31 9.09 9.46 10.0 13.6 14.9 16.3 26.1
0.20 5 12.4 13.2 13.7 14.5 19.3 20.8 22.5 36.5
0.50 2 24.7 25.5 26.1 27.6 34.1 36.9 40.4 72.1
June-July-August September-October-November
_________________________ __________________________
0.05 20 3.21 4.02 4.58 6.09 2.90 3.69 4.21 5.19
0.10 10 5.11 6.53 7.49 9.97 4.50 5.78 6.60 8.16
0.20 5 8.86 11.4 13.2 17.5 7.48 9.67 11.1 13.7
0.50 2 24.2 30.5 35.3 46.7 18.7 24.0 27.3 33.6
_____________________________________________________________________________________
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Annual peak discharge and corresponding gage height, period of record
[--, no data]
_____________________________________________________________________________________
Gage Peak Gage Peak
Water Date height discharge Water Date height discharge
year (feet) (ft3/s) year (feet) (ft3/s)
_____________________________________________________________________________________
Annual peak discharge, by year, and corresponding gage height
1909 July 22 20.00 9,200 1959 May 6 3.73 451
1910 April 26 9.60 1,610 1960 April 15 4.80 716
1911 April 22 6.70 473 1961 May 17 5.29 847
1912 May 12 7.55 758 1962 June 9 9.83 2,760
1913 April 2 9.60 1,610 1963 May 30 8.00 1,680
1914 June 10 8.50 1,120 1964 April 17 7.68 1,640
1915 June 29 11.10 2,340 1965 April 12 10.48 3,160
1916 June 1 -- 1,670 1966 April 2 8.90 2,120
1917 April 3 -- 719 1967 April 1 9.09 1,710
1931 May 21 -- 112 1968 March 30 4.33 594
1932 April 9 3.59 358 1969 April 10 11.83 4,850
1933 May 23 3.27 450 1970 April 30 7.97 1,740
1934 April 12 2.60 266 1971 April 10 6.01 1,060
1935 July 14 -- 216 1972 March 21 9.66 2,220
1936 April 14 9.27 2,490 1973 September 4 7.75 1,670
1937 May 3 3.32 301 1974 April 12 11.03 3,890
1938 May 12 5.82 836 1975 July 1 11.29 3,660
1939 March 30 4.44 459 1976 March 29 7.10 1,250
1940 April 9 7.28 1,100 1977 April 21 2.29 146
1941 April 3 6.11 828 1978 April 7 13.64 6,470
1942 May 3 8.15 1,550 1979 April 18 12.93 6,010
1943 June 4 11.74 4,120 1980 April 3 6.08 1,080
1944 July 8 7.86 1,560 1981 September 6 3.45 295
1945 April 2 8.15 1,520 1982 April 19 6.51 1,200
1946 March 24 7.60 1,490 1983 March 7 6.44 635
1947 April 15 9.47 2,510 1984 June 11 6.96 1,370
1948 April 9 5.65 916 1985 May 13 11.42 4,100
1949 July 8 7.94 1,610 1986 May 13 8.38 1,960
1950 June 26 12.02 4,380 1987 July 24 6.91 1,280
1951 April 9 8.31 1,820 1988 April 5 6.28 711
1952 April 8 8.27 1,810 1989 April 5 13.65 5,260
1953 July 4 6.44 1,170 1990 April 3 6.31 1,090
1954 April 10 7.09 1,390 1991 May 6 4.96 682
1955 April 4 5.57 927 1992 August 25 -- 791
1956 April 12 6.99 1,380 1993 July 28 11.74 3,980
1957 April 21 5.17 814 1994 June 21 8.37 1,810
1958 July 7 3.00 294
Annual peak discharge, from highest to lowest, and corresponding gage height
1909 July 22 20.00 9,200 1943 June 4 11.74 4,120
1978 April 7 13.64 6,470 1985 May 13 11.42 4,100
1979 April 18 12.93 6,010 1993 July 28 11.74 3,980
1989 April 5 13.65 5,260 1974 April 12 11.03 3,890
1969 April 10 11.83 4,850 1975 July 1 11.29 3,660
1950 June 26 12.02 4,380 1965 April 12 10.48 3,160
1962 June 9 9.83 2,760 1990 April 3 6.31 1,090
1947 April 15 9.47 2,510 1980 April 3 6.08 1,080
1936 April 14 9.27 2,490 1971 April 10 6.01 1,060
1915 June 29 11.10 2,340 1955 April 4 5.57 927
1972 March 21 9.66 2,220 1948 April 9 5.65 916
1966 April 2 8.90 2,120 1961 May 17 5.29 847
1986 May 13 8.38 1,960 1938 May 12 5.82 836
1951 April 9 8.31 1,820 1941 April 3,June 6 6.11 828
1952 April 8 8.27 1,810 1957 April 21 5.17 814
1994 June 21 8.37 1,810 1992 August 25 -- 791
1970 April 30 7.97 1,740 1912 May 12 7.55 758
1967 April 1 9.09 1,710 1917 April 3 -- 719
1963 May 30 8.00 1,680 1960 April 15 4.80 716
1916 June 1 -- 1,670 1988 April 5 6.28 711
1973 September 4 7.75 1,670 1991 May 6 4.96 682
1964 April 17 7.68 1,640 1983 March 7 6.44 635
1910 April 26 9.60 1,610 1968 March 30 4.33 594
1913 April 2 9.60 1,610 1911 April 22 6.70 473
1949 July 8 7.94 1,610 1939 March 30 4.44 459
1944 July 8 7.86 1,560 1959 May 6 3.73 451
1942 May 3 8.15 1,550 1933 May 23 3.27 450
1945 April 2 8.15 1,520 1932 April 9 3.59 358
1946 March 24 7.60 1,490 1937 May 3 3.32 301
1954 April 10 7.09 1,390 1981 September 6 3.45 295
1956 April 12 6.99 1,380 1958 July 7 3.00 294
1984 June 11 6.96 1,370 1934 April 12 2.60 266
1987 July 24 6.91 1,280 1935 July 14 -- 216
1976 March 29 7.10 1,250 1977 April 21 2.29 146
1982 April 19 6.51 1,200 1914 June 10 8.50 112
1953 July 4 6.44 1,170 1931 May 21 -- 112
1940 April 9 7.28 1,100
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Monthly and annual mean discharges, in cubic feet per second
[Data were not rounded in accordance with U.S. Geological Survey publication standards; --, no data]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1909 -- -- -- -- -- -- -- -- -- 1,923 959.8 286.4 --
1910 105.4 136.4 120.0 100.0 80.0 80.0 552.0 562.9 274.0 53.8 21.0 21.6 175.6
1911 24.5 25.4 21.0 22.0 18.0 70.0 238.5 200.2 103.6 132.6 33.3 25.5 76.5
1912 133.6 32.4 35.0 31.0 13.0 25.0 179.2 416.4 117.1 49.5 33.0 105.8 97.9
1913 162.7 68.1 19.0 12.4 8.93 40.5 451.6 118.2 309.1 82.8 107.1 52.1 119.2
1914 57.2 75.6 54.0 21.1 14.1 36.8 251.9 210.6 542.8 336.5 118.8 138.9 154.9
1915 120.6 95.9 69.5 29.7 33.9 59.0 248.6 408.9 747.7 773.5 246.4 138.8 248.8
1916 109.6 81.4 53.9 36.8 27.6 76.8 989.3 654.0 844.3 717.1 257.8 205.0 337.4
1917 148.3 110.6 79.2 59.5 40.0 111.3 417.6 214.4 82.5 46.9 26.9 50.8 115.7
1930 -- -- -- -- -- -- -- -- -- -- 10.1 11.0 --
1931 14.3 28.2 20.0 15.0 25.0 29.9 73.8 58.1 60.4 30.9 26.3 9.89 32.6
1932 16.7 24.2 20.0 35.0 25.0 70.5 137.8 127.8 63.6 13.3 3.02 4.65 45.1
1933 6.10 9.31 6.00 4.00 4.00 162.1 206.6 126.0 98.5 19.6 5.41 4.90 54.5
1934 12.0 15.9 12.0 9.00 12.0 15.0 141.0 70.1 26.8 8.04 4.79 4.56 27.5
1935 7.85 13.1 8.69 12.1 12.1 66.6 109.6 135.7 86.1 130.6 84.6 64.4 61.3
1936 41.4 34.0 25.7 14.2 10.0 19.8 607.1 252.4 85.9 16.7 3.37 2.96 92.3
1937 6.78 10.4 7.79 9.57 11.1 15.5 86.9 205.9 121.8 51.2 56.9 50.9 53.1
1938 33.1 32.3 10.4 16.5 18.5 80.3 89.6 539.1 237.8 116.4 40.0 16.0 103.3
1939 14.6 17.8 21.4 17.5 18.0 75.7 247.1 88.9 71.5 44.0 13.9 13.7 53.6
1940 16.2 16.1 15.9 9.24 9.34 12.8 295.4 191.5 83.1 19.5 17.6 5.22 57.5
1941 16.6 28.1 25.4 23.3 16.1 42.1 441.3 260.8 334.4 59.6 85.6 199.0 127.2
1942 218.2 102.3 53.7 18.9 20.6 134.3 326.3 650.9 241.4 102.8 96.8 275.8 187.7
1943 141.4 91.3 49.1 38.4 36.5 110.6 957.8 610.4 1,560 298.4 142.0 57.1 340.0
1944 44.0 41.5 22.5 21.5 23.3 31.9 169.7 384.6 456.4 736.1 502.5 487.5 244.2
1945 242.9 145.4 97.3 68.2 59.3 746.9 1,219 580.5 198.1 82.9 74.7 130.6 304.5
1946 183.4 100.9 73.9 47.7 39.6 507.4 713.3 400.6 215.5 131.0 28.0 33.3 206.9
1947 166.2 115.4 74.7 58.4 52.5 113.5 1,274 860.9 736.1 174.6 75.9 68.9 313.8
1948 82.6 64.1 56.5 50.4 27.3 60.8 606.2 313.7 115.0 79.5 34.7 10.7 124.9
1949 13.0 26.2 28.4 28.8 24.1 27.4 286.2 269.9 298.2 840.6 470.7 106.9 203.4
1950 83.5 110.5 105.6 38.7 45.5 157.2 1,302 2,259 1,069 646.1 110.5 48.9 500.3
1951 122.6 81.2 73.1 66.3 70.4 92.0 1,104 774.8 291.8 88.4 55.6 123.1 245.0
1952 132.2 102.4 116.8 93.4 77.3 79.9 907.9 349.5 87.5 185.6 118.8 53.7 191.7
1953 32.6 43.9 50.2 37.6 36.0 205.5 390.2 389.9 439.3 517.0 199.3 76.8 202.5
1954 46.3 51.7 68.1 65.9 72.9 111.2 654.5 536.4 257.6 97.7 27.0 27.1 167.9
1955 40.8 50.8 41.1 31.5 33.7 37.9 485.2 259.7 230.7 121.0 38.8 11.3 115.0
1956 17.5 18.4 14.3 12.9 16.8 21.2 521.9 326.9 159.6 28.8 16.8 13.3 96.9
1957 14.3 33.4 19.1 16.1 18.9 112.6 350.7 269.4 248.8 308.8 81.0 152.9 135.8
1958 148.2 184.0 66.4 48.3 42.7 96.9 142.8 76.2 128.1 139.0 33.6 23.8 94.3
1959 29.1 57.6 37.9 24.6 22.0 79.1 203.1 222.6 172.0 154.6 65.7 24.1 91.4
1960 45.4 47.2 45.6 46.4 42.2 64.5 458.8 315.2 352.8 153.4 77.3 135.3 148.2
1961 81.4 62.3 56.4 36.3 34.7 134.7 229.3 494.0 138.4 46.1 22.2 31.7 114.6
1962 35.6 47.6 31.0 26.9 24.6 37.9 402.2 717.5 1,226 454.4 143.4 96.7 270.5
1963 68.1 71.6 42.5 9.65 6.50 66.0 325.2 390.6 641.6 112.2 49.1 48.2 152.5
1964 26.1 28.7 22.4 24.5 29.6 38.9 670.8 547.4 444.8 162.1 37.0 37.3 171.9
1965 62.6 51.7 32.1 33.1 34.4 33.1 1,241 639.1 607.4 177.6 45.7 55.9 250.3
1966 125.9 73.3 102.5 70.8 40.4 577.1 1,190 785.8 222.4 85.0 139.5 80.8 292.1
1967 75.5 61.3 51.8 60.8 64.2 205.3 977.3 491.3 405.7 231.1 38.2 16.6 223.0
1968 23.6 24.1 43.7 30.1 21.2 177.9 327.7 284.0 182.2 141.6 62.7 74.7 116.3
1969 118.4 95.4 59.6 55.5 59.1 64.4 1,357 458.8 250.9 80.9 44.4 32.0 222.1
1970 134.3 134.7 102.8 65.7 52.4 58.0 870.9 759.8 606.2 152.8 25.9 17.4 248.3
1971 27.5 66.4 40.4 33.8 36.2 101.9 599.4 278.8 126.4 53.8 31.9 52.4 120.5
1972 364.1 487.6 122.7 77.1 58.4 466.2 1,034 723.2 258.4 96.0 98.7 56.4 320.1
1973 72.5 65.6 35.7 37.3 39.9 276.5 207.5 179.8 132.6 74.5 81.8 788.4 165.6
1974 613.5 203.1 95.5 64.7 60.5 62.0 1,452 1,223 474.9 90.8 59.8 34.6 370.2
1975 48.3 107.1 65.5 51.3 52.2 74.6 1,173 825.3 662.2 1,175 154.7 49.2 371.1
1976 48.7 86.1 61.5 58.6 61.8 316.3 568.7 152.8 65.4 32.4 7.85 4.01 121.7
1977 10.7 12.2 7.65 8.39 12.6 29.4 91.1 30.9 26.4 12.7 5.72 25.2 22.7
1978 68.0 112.6 113.6 68.5 47.4 74.7 1,508 307.8 131.2 75.7 68.5 99.8 221.8
1979 48.8 42.6 37.1 34.8 41.8 82.5 1,543 832.6 301.0 357.6 55.9 36.7 284.4
1980 27.0 100.9 59.5 46.1 48.0 73.2 504.0 124.1 30.2 10.8 8.19 11.5 86.3
1981 19.2 25.7 18.6 15.6 21.0 54.5 85.9 74.3 132.0 160.0 92.5 143.3 70.3
1982 224.3 184.5 83.8 53.9 50.0 172.7 875.5 575.3 200.0 61.0 24.6 14.7 210.1
1983 138.9 122.0 49.7 44.0 44.6 389.5 237.4 152.4 184.9 344.5 108.5 61.5 157.4
1984 -- -- -- -- -- -- -- -- -- -- -- -- --
1989 -- -- -- -- -- -- -- -- -- -- -- -- --
1990 39.7 39.1 16.2 17.4 22.7 164.9 307.4 226.8 173.2 59.2 11.4 5.39 90.4
1991 10.3 19.7 16.0 17.0 26.9 93.0 163.1 419.8 103.0 99.0 20.0 20.1 84.5
1992 20.6 26.0 32.8 38.6 41.0 286.7 156.8 177.8 65.3 313.5 188.2 208.7 130.3
1993 62.7 74.7 71.5 66.2 63.5 228.5 545.8 273.1 342.7 1,079 1,024 281.7 345.4
1994 111.2 100.3 97.5 91.6 90.8 290.7 639.6 499.0 517.1 575.8 193.3 238.0 287.7
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U.S. Geological Survey Maintainer: Webmaster Last update: Tuesday, 31-Aug-2004 10:29:01 EDT Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr97416/htdocs/f.05062500.html |
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