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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 211 1995 1.52 1993 9.66 32.5 3.37 1.53
November 63.6 1995 1.49 1961 5.81 9.68 1.67 0.92
December 16.0 1995 1.32 1961 3.38 2.38 0.70 0.53
January 4.05 1976 1.21 1969 2.45 0.74 0.30 0.39
February 11.9 1976 1.30 1969 2.98 1.98 0.66 0.47
March 622 1966 2.10 1969 131 171 1.31 20.6
April 2,160 1997 2.06 1991 279 418 1.50 44.0
May 259 1996 2.19 1992 56.0 73.0 1.30 8.84
June 424 1975 1.41 1961 43.2 88.7 2.05 6.82
July 874 1993 1.44 1961 66.5 163 2.45 10.5
August 506 1993 1.33 1961 22.8 80.4 3.53 3.60
September 111 1994 1.28 1984 10.8 19.7 1.82 1.71
Annual 242 1997 2.14 1990 53.0 54.4 1.03 100
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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 1.40 1.40 1.50 2.30 2.20 1.70 1.40 1.30 1.40 1.60 1.50 1.20 1.40
90 1.60 1.60 2.00 2.90 2.70 2.20 1.70 1.30 1.60 1.60 1.80 1.50 1.40
85 1.70 1.60 2.00 5.07 3.30 2.20 2.20 1.70 1.60 1.90 2.00 1.80 1.90
80 1.80 1.80 2.00 6.87 4.32 2.80 2.20 1.70 1.60 1.90 2.00 1.80 1.90
75 1.90 1.80 2.00 13.7 5.33 3.72 2.20 2.10 2.00 1.90 2.30 2.10 1.90
70 2.00 1.80 2.80 18.9 6.57 4.27 2.90 2.10 2.00 2.30 2.30 2.10 1.90
65 2.00 1.80 2.80 24.4 8.21 4.85 2.90 2.10 2.00 2.30 2.30 2.10 1.90
60 2.10 1.80 3.87 33.2 10.5 5.47 2.90 2.10 2.40 2.30 2.70 2.10 2.95
55 2.10 1.80 4.53 46.8 13.2 6.52 3.70 2.60 2.40 2.80 2.70 2.50 3.27
50 2.10 2.10 5.78 65.1 16.6 8.13 5.22 2.60 2.40 2.80 2.70 2.50 3.60
45 2.10 2.10 8.44 88.8 21.7 10.1 6.50 2.60 3.00 2.80 3.10 2.50 4.06
40 2.40 2.40 14.2 118 27.1 12.5 8.90 3.30 3.60 3.40 3.60 2.50 4.57
35 2.50 2.40 23.5 146 32.8 14.7 12.7 4.37 3.60 3.40 4.10 3.10 6.24
30 2.50 2.70 38.7 189 42.9 16.7 17.4 5.28 5.34 4.20 4.80 3.10 8.10
25 2.80 2.70 67.3 260 57.0 20.9 23.8 6.68 6.77 5.00 5.50 3.70 12.6
20 3.00 3.10 118 365 76.5 27.7 33.8 8.89 8.23 5.85 6.45 3.70 19.9
15 3.30 3.50 222 504 103 37.9 58.6 14.8 13.7 7.82 7.94 4.40 35.7
10 3.50 4.00 472 697 142 58.3 118 23.8 21.3 12.1 10.0 5.61 81.6
5 4.00 4.50 839 1,210 218 119 295 68.1 43.2 19.1 14.3 6.76 228
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Probability of annual high discharges
[ng, statistic not given]
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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)
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0.99 1.01 12.2 4.00 2.77 2.05 1.65
0.95 1.05 48.2 22.8 16.9 12.4 9.12
0.90 1.11 95.0 52.4 39.9 29.0 20.6
0.80 1.25 207 132 103 74.0 51.0
0.50 2 797 597 478 339 224
0.20 5 2,590 1,990 1,590 1,110 724
0.10 10 4,480 3,330 2,630 1,830 1,200
0.04 25 7,680 5,330 4,150 2,860 1,890
0.02 50 10,600 6,940 5,330 3,660 2,430
0.01 100 14,000 8,580 6,500 4,450 2,990
0.005 200 17,700 10,200 7,650 5,210 3,530
0.002 500 23,200 ng ng ng ng
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Annual peak discharge and corresponding gage height, period of record
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Gage Peak Gage Peak
Water Date height discharge Water Date height discharge
year (feet) (ft3/s) year (feet) (ft3/s)
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Annual peak discharge, by year, and corresponding gage height
1956 June 7 4.15 92.0 1977 July 5 5.32 208
1957 August 13 4.89 150 1978 March 24 10.19 2,350
1958 April 6 5.34 202 1979 April 20 11.50 3,200
1959 November 18 3.03 34.0 1980 March 19 6.07 250
1960 April 8 7.26 621 1981 July 14 5.84 172
1961 March 4 3.78 39.0 1982 April 2 11.72 3,400
1962 August 11 9.54 1,630 1983 June 23 12.23 2,930
1963 April 6 5.85 280 1984 March 28 10.95 2,590
1964 June 9 5.32 209 1985 May 12 6.39 357
1965 April 12 11.05 3,390 1986 March 24 8.48 1,090
1966 March 18 10.39 2,100 1987 March 22 10.41 2,220
1967 April 23 7.31 702 1988 March 9 7.84 302
1968 June 19 6.05 325 1989 March 31 8.42 981
1969 April 11 13.55 5,750 1990 June 2 3.37 15.0
1970 May 29 11.06 3,260 1991 May 27 5.25 178
1971 March 24 5.58 207 1992 March 10 7.32 710
1972 March 18 7.48 742 1993 July 17 12.72 3,770
1973 March 17 9.03 1,400 1994 March 22 11.50 3,040
1974 April 14 7.22 594 1995 March 17 10.07 1,830
1975 June 30 15.41 7,610 1996 April 11 12.28 3,860
1976 March 23 5.72 246 1997 April 16 12.58 4,060
Annual peak discharge, from highest to lowest, and corresponding gage height
1975 June 30 15.41 7,610 1992 March 10 7.32 710
1969 April 11 13.55 5,750 1967 April 23 7.31 702
1997 April 16 12.58 4,060 1960 April 8 7.26 621
1996 April 11 12.28 3,860 1974 April 14 7.22 594
1993 July 17 12.72 3,770 1985 May 12 6.39 357
1982 April 2 11.72 3,400 1968 June 19 6.05 325
1965 April 12 11.05 3,390 1988 March 9 7.84 302
1970 May 29 11.06 3,260 1963 April 6 5.85 280
1979 April 20 11.50 3,200 1980 March 19 6.07 250
1994 March 22 11.50 3,040 1976 March 23 5.72 246
1983 June 23 12.23 2,930 1964 June 9 5.32 209
1984 March 28 10.95 2,590 1977 July 5 5.32 208
1978 March 24 10.19 2,350 1971 March 24 5.58 207
1987 March 22 10.41 2,220 1958 April 6 5.34 202
1966 March 18 10.39 2,100 1991 May 27 5.25 178
1995 March 17 10.07 1,830 1981 July 14 5.84 172
1962 August 11 9.54 1,630 1957 August 13 4.89 150
1973 March 17 9.03 1,400 1956 June 7 4.15 92.0
1986 March 24 8.48 1,090 1961 March 4 3.78 39.0
1989 March 31 8.42 981 1959 November 18 3.03 34.0
1972 March 18 7.48 742 1990 June 2 3.37 15.0
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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
__________________________________________________________________________________________________________________________________
1956 -- -- -- -- -- -- -- -- 11.2 1.79 4.37 6.35 --
1957 2.55 3.09 2.35 2.02 1.92 3.06 5.87 3.46 6.64 9.44 13.7 28.1 6.85
1958 7.94 13.3 5.87 2.74 9.18 25.7 45.8 5.22 10.4 15.8 2.73 2.31 12.2
1959 2.15 3.26 3.00 2.03 2.15 3.51 2.59 2.55 2.76 3.38 2.13 1.95 2.62
1960 3.05 2.42 2.02 1.72 1.97 47.6 200.6 7.58 4.04 2.66 1.75 1.76 22.9
1961 1.59 1.49 1.32 1.37 1.45 10.6 5.33 4.74 1.41 1.44 1.33 1.46 2.81
1962 2.08 1.73 1.72 1.75 1.60 59.6 257.3 49.0 45.5 404.0 152.0 23.1 84.0
1963 11.3 10.2 4.94 2.64 3.06 4.99 50.1 12.5 14.9 3.02 2.61 2.30 10.2
1964 2.15 2.31 1.88 2.17 2.06 3.44 24.7 14.3 15.4 14.8 4.24 3.62 7.58
1965 3.36 3.50 2.75 2.75 2.81 3.78 750.0 38.8 26.3 33.4 48.5 17.0 77.0
1966 16.6 11.2 5.84 2.46 2.20 622.2 238.6 70.5 15.4 10.3 8.65 6.58 85.1
1967 3.67 3.17 2.73 2.44 2.06 46.8 229.6 108.6 7.19 3.62 1.59 1.92 34.4
1968 2.47 2.26 2.12 1.97 2.74 36.3 20.0 12.2 102.6 17.3 7.64 2.82 17.5
1969 2.45 2.74 2.26 1.21 1.30 2.10 1,231 29.9 19.7 78.2 12.2 16.2 115.4
1970 5.34 4.00 2.82 2.15 1.85 16.9 258.1 191.1 160.8 22.1 3.26 6.00 56.1
1971 3.65 4.94 2.99 2.20 1.87 51.1 45.1 14.1 17.9 24.7 3.32 2.41 14.6
1972 7.42 8.65 4.97 3.60 4.54 183.3 156.0 59.6 43.6 6.95 21.8 11.1 42.7
1973 4.57 5.14 4.34 4.02 4.68 215.2 27.1 6.38 3.41 1.71 2.49 3.52 23.9
1974 3.98 2.77 2.44 3.61 2.80 4.30 200.6 82.1 21.4 3.29 2.85 3.16 27.7
1975 3.73 2.74 2.68 2.36 1.85 10.1 487.4 146.7 423.7 477.2 10.5 7.01 131.3
1976 5.95 6.51 4.25 4.05 11.9 63.0 50.2 7.66 3.48 3.19 3.33 3.98 13.9
1977 2.36 2.81 2.56 2.67 3.00 5.54 7.40 20.6 8.46 9.53 2.37 3.49 5.93
1978 4.38 6.92 4.44 3.06 3.20 348.5 272.1 22.7 16.5 18.0 3.31 2.74 59.1
1979 3.24 2.60 2.45 2.37 2.64 4.00 888.1 177.0 14.0 4.37 3.04 3.43 91.5
1980 3.05 3.67 2.95 2.64 2.56 37.3 72.0 5.90 4.42 3.78 2.97 2.80 12.0
1981 2.87 2.63 3.39 1.86 2.82 2.41 3.28 3.34 3.98 14.0 2.84 2.82 3.87
1982 3.36 2.43 2.46 2.09 1.71 35.1 674.2 32.6 10.8 3.88 2.56 2.00 63.8
1983 3.97 4.99 4.19 2.37 3.98 330.8 114.9 22.4 341.7 195.1 5.74 3.47 86.5
1984 2.86 3.76 2.61 2.15 2.82 319.8 314.0 27.0 4.04 2.95 1.89 1.28 57.1
1985 2.29 3.00 1.48 1.59 1.64 37.0 11.5 63.5 11.8 4.15 2.02 2.53 12.0
1986 2.59 3.28 2.40 1.89 1.91 229.6 256.6 102.7 7.55 7.94 8.09 5.85 52.8
1987 5.84 6.02 4.28 2.97 3.06 493.9 172.7 55.7 15.0 2.49 2.02 1.75 64.5
1988 2.02 2.62 2.19 1.88 3.98 97.6 36.9 4.16 2.26 1.92 2.31 2.07 13.4
1989 1.88 2.05 1.94 2.26 2.04 109.9 270.3 10.4 2.31 2.07 2.88 1.73 34.0
1990 2.27 2.38 1.53 1.67 1.39 2.58 2.74 2.39 2.72 1.63 1.92 2.51 2.14
1991 2.19 2.16 1.75 1.70 1.87 2.90 2.06 24.6 23.8 9.68 2.05 1.64 6.39
1992 1.56 1.69 1.61 1.96 4.74 238.7 13.5 2.19 4.31 56.5 3.77 2.49 28.1
1993 1.52 1.94 2.35 2.07 1.70 161.0 253.6 14.8 80.9 874.5 506.5 55.2 165.0
1994 13.7 6.07 4.98 3.55 2.78 419.5 202.4 78.3 18.9 170.2 49.2 111.1 90.8
1995 211.2 63.6 16.0 3.92 3.69 565.0 483.0 256.8 14.0 159.7 26.8 36.6 154.6
1996 21.6 9.16 4.74 3.11 3.61 370.9 934.6 258.8 43.9 5.42 2.62 35.3 140.6
1997 5.46 8.90 5.11 3.57 3.09 130.2 2,162 241.5 224.3 108.1 11.1 21.6 241.8
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U.S. Geological Survey Maintainer: Webmaster Last update: Tuesday, 24-Aug-2004 12:38:25 EDT Privacy || Disclaimer|| Accessibility || FOIA URL: http://nd.water.usgs.gov/pubs/ofr/ofr00344/htdocs/ff.05059700.html |
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