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Statistics of monthly and annual mean discharge
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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
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October 73.2 1983 1.16 1953 13.6 15.7 1.16 1.81
November 65.5 1995 1.28 1961 12.6 12.1 0.96 1.68
December 42.8 1995 0.765 1961 7.81 7.56 0.97 1.04
January 26.3 1983 0.474 1990 5.29 5.06 0.96 0.71
February 154 1981 0.754 1990 9.81 23.3 2.38 1.31
March 793 1983 1.46 1964 129 189 1.47 17.2
April 1,790 1997 15.8 1977 323 379 1.17 43.1
May 854 1950 10.4 1990 113 155 1.38 15.1
June 326 1954 1.75 1961 55.4 60.2 1.09 7.40
July 299 1993 0.356 1989 43.3 57.9 1.34 5.78
August 423 1993 0.090 1961 24.9 61.9 2.49 3.32
September 63.0 1957 0.707 1961 11.7 14.0 1.19 1.57
Annual 208 1997 5.31 1977 62.4 48.9 0.78 100
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Monthly and annual flow duration, in cubic feet per second
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Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
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95 1.00 0.94 1.10 15.5 11.6 2.70 0.55 0.25 0.66 0.95 1.60 1.30 0.73
90 1.20 1.20 1.90 21.2 16.0 4.75 0.94 0.74 0.84 1.10 2.20 1.80 1.10
85 1.70 1.40 2.40 25.7 18.9 7.00 1.60 0.74 0.84 1.50 2.90 2.10 1.60
80 1.90 1.40 3.10 30.7 21.7 10.4 2.70 1.10 1.30 1.80 3.90 2.90 2.70
75 1.90 1.80 4.17 36.0 24.4 12.9 4.82 1.50 1.30 2.50 3.90 2.90 3.37
70 2.30 2.20 4.67 42.0 27.2 15.4 6.21 1.50 1.70 2.90 4.50 3.40 3.93
65 2.70 2.20 5.49 49.9 31.7 17.8 7.10 2.20 1.70 3.50 5.90 4.00 4.38
60 3.10 2.70 6.70 62.5 36.1 21.0 10.4 3.39 2.20 4.10 7.09 4.00 6.12
55 3.10 2.70 7.42 82.3 40.5 24.4 13.6 4.08 3.50 4.80 8.00 4.70 8.14
50 3.10 2.70 13.1 102 47.7 29.6 16.2 5.19 4.78 6.38 8.68 4.70 9.98
45 3.60 3.40 19.9 132 57.2 35.6 19.0 7.40 6.02 8.09 10.1 5.78 13.0
40 4.20 3.40 27.8 161 70.0 42.5 22.3 10.2 7.55 9.75 11.7 6.49 16.0
35 4.20 4.20 40.9 193 83.3 50.6 27.7 13.6 9.90 12.8 13.0 7.30 20.3
30 4.90 5.27 61.2 232 97.2 59.5 33.6 17.1 12.3 14.8 14.5 8.31 25.4
25 6.83 6.53 84.1 300 118 69.3 40.5 21.3 14.8 17.0 16.7 9.74 34.0
20 8.00 7.22 117 418 140 80.6 54.3 26.5 17.4 22.1 18.7 11.2 47.9
15 8.74 8.37 182 588 181 92.5 75.9 35.9 21.3 28.5 20.9 13.8 71.2
10 11.2 11.4 388 888 247 122 103 50.4 28.4 35.8 24.5 16.2 114
5 14.6 17.7 828 1,510 394 196 153 80.0 42.6 52.5 42.2 21.7 245
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Probability of annual high discharges
[ng, statistic not given]
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Maximum average discharge
(ft3/s)
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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 33.2 23.0 17.0 13.2 12.3
0.95 1.05 96.7 73.8 58.5 44.7 35.7
0.90 1.11 164 131 107 80.7 60.4
0.80 1.25 300 250 209 156 110
0.50 2 851 749 645 468 304
0.20 5 2,100 1,900 1,640 1,150 727
0.10 10 3,190 2,890 2,480 1,710 1,080
0.04 25 4,800 4,330 3,670 2,480 1,590
0.02 50 6,130 5,480 4,600 3,070 2,000
0.01 100 7,530 6,680 5,530 3,660 2,410
0.005 200 9,000 7,910 6,470 4,230 2,840
0.002 500 11,000 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
1950 April 17 7.45 3,800 1974 May 24 6.14 2,030
1951 April 11 5.01 1,240 1975 April 21 6.16 1,800
1952 April 8 4.17 737 1976 March 31 4.70 1,090
1953 July 3 3.08 204 1977 May 5 2.64 66.0
1954 June 19 4.38 878 1978 April 5 6.10 1,440
1955 April 3 5.04 1,330 1979 April 25 7.34 2,600
1956 April 18 7.83 4,250 1980 April 3 3.81 560
1957 September 5 3.17 249 1981 February 24 4.01 594
1958 March 3 4.04 666 1982 April 4 5.38 1,420
1959 March 21 2.83 153 1983 March 12 5.51 1,480
1960 April 7 5.57 1,450 1984 March 28 4.78 1,030
1961 March 26 2.55 81.0 1985 March 17 3.76 579
1962 April 1 3.50 436 1986 March 19 5.16 1,000
1963 June 25 2.68 116 1987 April 5 6.00 1,730
1964 April 9 3.13 247 1988 March 25 2.88 151
1965 April 12 4.64 1,000 1989 April 7 4.02 710
1966 March 19 7.63 3,100 1990 June 5 2.52 66.0
1967 March 31 5.24 1,340 1991 July 2 2.71 119
1968 March 12 3.10 211 1992 March 7 4.53 960
1969 April 14 7.51 4,660 1993 August 1 6.00 1,470
1970 April 10 3.52 445 1994 March 27 5.21 1,170
1971 April 12 6.55 2,360 1995 March 21 6.94 2,000
1972 March 21 5.08 1,360 1996 April 15 7.79 3,740
1973 March 13 3.10 170 1997 April 21 8.08 3,990
Annual peak discharge, from highest to lowest, and corresponding gage height
1969 April 14 7.51 4,660 1951 April 11 5.01 1,240
1956 April 18 7.83 4,250 1994 March 27 5.21 1,170
1997 April 21 8.08 3,990 1976 March 31 4.70 1,090
1950 April 17 7.45 3,800 1984 March 28 4.78 1,030
1996 April 15 7.79 3,740 1965 April 12 4.64 1,000
1966 March 19 7.63 3,100 1986 March 19 5.16 1,000
1979 April 25 7.34 2,600 1992 March 7 4.53 960
1971 April 12 6.55 2,360 1954 June 19 4.38 878
1974 May 24 6.14 2,030 1952 April 8 4.17 737
1995 March 21 6.94 2,000 1989 April 7 4.02 710
1975 April 21 6.16 1,800 1958 March 3 4.04 666
1987 April 5 6.00 1,730 1981 February 24 4.01 594
1983 March 12 5.51 1,480 1985 March 17 3.76 579
1993 August 1 6.00 1,470 1980 April 3 3.81 560
1960 April 7 5.57 1,450 1970 April 10 3.52 445
1978 April 5 6.10 1,440 1962 April 1 3.50 436
1982 April 4 5.38 1,420 1957 September 5 3.17 249
1972 March 21 5.08 1,360 1964 April 9 3.13 247
1967 March 31 5.24 1,340 1968 March 12 3.10 211
1955 April 3 5.04 1,330 1953 July 3 3.08 204
1973 March 13 3.10 170 1963 June 25 2.68 116
1959 March 21 2.83 153 1961 March 26 2.55 81.0
1988 March 25 2.88 151 1977 May 5 2.64 66.0
1991 July 2 2.71 119 1990 June 5 2.52 66.0
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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]
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Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
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1950 7.90 8.87 4.05 1.50 1.50 12.3 1,421 854.0 98.8 30.0 8.23 6.08 204.2
1951 12.0 11.1 8.23 10.6 6.68 21.7 440.3 90.5 70.1 21.5 2.68 11.6 58.5
1952 7.77 8.87 6.74 2.03 3.24 6.23 283.8 43.4 6.13 44.9 3.55 1.37 34.6
1953 1.16 7.97 2.61 2.35 2.57 13.3 38.5 60.3 61.2 64.4 3.06 2.07 21.7
1954 1.55 2.83 3.45 3.61 34.8 79.0 64.1 30.9 325.6 170.0 48.3 38.3 66.7
1955 33.5 18.5 9.06 3.14 2.43 40.4 332.5 65.4 77.5 23.6 4.48 2.11 50.8
1956 2.62 2.37 2.07 1.51 1.88 2.19 631.3 100.2 189.4 19.0 3.93 9.56 79.5
1957 6.05 23.8 6.84 2.62 1.30 43.3 51.3 36.4 21.1 24.5 25.8 63.0 25.5
1958 31.1 18.1 10.1 9.23 8.21 38.7 62.1 20.9 16.0 61.5 4.84 1.42 23.6
1959 3.05 5.23 4.63 3.20 2.49 48.6 35.2 23.9 8.92 2.57 1.11 0.803 11.7
1960 8.11 11.0 4.18 2.81 1.82 21.7 391.7 97.4 63.4 12.6 4.46 1.04 51.2
1961 1.53 1.28 0.765 0.723 0.961 23.2 31.5 13.7 1.75 1.45 0.090 0.707 6.49
1962 1.56 2.38 2.10 1.56 1.30 23.1 123.4 59.4 84.4 22.7 15.8 6.60 28.6
1963 6.10 6.30 4.62 2.14 1.52 17.1 32.0 22.4 23.0 6.95 3.57 1.71 10.6
1964 1.17 1.86 1.05 1.07 1.26 1.46 88.6 32.8 58.2 24.0 5.39 11.7 18.9
1965 16.3 8.65 5.90 2.04 3.06 12.3 270.8 38.7 17.0 123.1 57.2 24.2 48.3
1966 43.0 12.9 9.60 3.27 2.20 650.5 136.5 88.8 28.4 51.1 18.4 6.66 88.8
1967 9.65 6.52 4.13 3.64 4.74 197.2 211.5 139.8 29.5 10.4 1.43 1.57 51.9
1968 3.26 3.84 2.53 2.25 2.54 91.3 26.9 31.4 13.1 5.65 5.87 12.6 16.9
1969 6.81 4.83 3.83 2.58 2.17 2.37 1,022 85.0 26.7 24.2 24.0 5.85 99.9
1970 3.01 4.66 4.86 3.64 3.57 14.6 178.9 107.6 58.7 13.4 27.6 4.80 35.4
1971 3.84 8.10 4.27 3.18 2.10 4.61 674.7 66.6 163.6 79.6 6.85 18.3 85.6
1972 32.4 24.2 9.09 4.11 3.09 325.9 151.4 78.1 34.3 2.88 1.96 1.92 56.1
1973 3.77 8.83 3.42 2.39 1.88 72.9 25.5 20.1 6.66 1.56 1.88 3.25 12.8
1974 8.02 4.85 4.24 2.25 2.48 15.3 464.3 488.9 89.1 9.75 0.901 0.889 91.1
1975 3.73 11.8 5.70 5.95 5.75 51.6 561.2 369.5 67.5 45.4 6.38 8.07 95.2
1976 7.12 10.7 5.98 5.21 11.0 297.5 280.1 64.5 18.5 3.58 1.23 1.55 59.0
1977 1.97 2.19 2.68 3.32 3.42 15.4 15.8 12.5 2.24 1.07 1.18 1.70 5.31
1978 3.29 3.89 4.66 4.37 2.38 30.5 348.2 21.5 15.3 13.9 12.2 2.51 38.3
1979 2.74 8.97 4.39 7.09 4.76 5.79 701.3 288.9 56.2 117.4 52.0 8.30 104.7
1980 8.11 12.7 7.22 4.66 4.41 26.3 175.6 21.7 36.0 5.57 21.6 42.0 30.2
1981 41.7 50.3 19.6 12.3 153.6 165.3 71.6 53.7 135.2 40.5 19.7 28.0 65.2
1982 25.1 20.6 15.1 5.85 3.91 153.6 608.6 134.1 92.1 159.3 42.2 11.0 106.0
1983 73.2 33.9 29.6 26.3 55.9 793.0 309.2 105.1 45.2 21.4 5.46 8.40 126.4
1984 26.7 18.8 6.97 4.30 26.6 247.7 266.5 190.4 44.3 4.24 2.48 1.93 70.2
1985 8.53 8.64 5.91 3.65 4.09 249.9 39.8 29.4 29.0 7.01 80.3 44.6 43.0
1986 43.5 26.5 12.6 8.45 7.79 423.4 250.7 132.8 14.5 22.3 32.2 28.3 84.3
1987 18.5 18.7 19.3 13.1 16.1 215.7 545.1 52.8 18.7 142.0 60.2 16.9 94.8
1988 18.3 17.8 15.6 5.71 7.99 65.2 49.0 24.7 11.5 0.691 0.774 2.65 18.4
1989 2.50 4.02 3.62 3.88 3.50 4.44 186.5 23.1 4.74 0.356 0.398 0.763 19.6
1990 1.26 3.59 1.50 0.474 0.754 5.44 24.9 10.4 26.7 8.57 3.64 2.12 7.42
1991 2.38 11.1 3.77 1.64 2.64 10.5 17.0 34.5 23.8 31.9 14.6 22.1 14.7
1992 14.0 13.4 9.10 7.33 13.7 346.1 39.0 22.3 4.85 1.71 0.555 0.838 39.8
1993 1.32 3.08 4.08 3.00 2.96 82.5 182.1 49.6 20.7 299.2 423.4 37.8 93.6
1994 12.7 13.7 14.3 10.7 9.85 339.9 198.8 78.9 163.2 53.3 10.4 11.5 76.8
1995 49.9 65.5 42.8 22.5 15.7 696.4 479.6 282.9 91.4 88.8 53.5 12.1 159.6
1996 14.3 11.7 9.05 8.83 7.58 143.6 1,165 302.4 103.5 56.0 33.2 13.3 154.7
1997 16.4 13.5 9.06 7.72 6.86 35.0 1,794 414.0 61.7 104.2 34.7 18.4 208.4
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