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Post-regulation period, 1955-97
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Statistics of monthly and annual mean discharges, post-regulation period
__________________________________________________________________________________________________________
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 30.1 1981 0.513 1962 6.70 6.60 0.98 2.45
November 22.7 1981 0.560 1976 7.26 5.17 0.71 2.65
December 12.9 1971 0.700 1976 4.82 3.25 0.68 1.76
January 7.27 1971 1.23 1955 3.42 1.70 0.50 1.25
February 18.7 1981 0.571 1962 3.91 3.58 0.92 1.43
March 135 1966 0.216 1964 24.0 30.6 1.28 8.75
April 318 1997 0.428 1991 117 97.8 0.84 42.8
May 293 1997 1.63 1980 56.8 73.2 1.29 20.8
June 78.7 1964 0.473 1988 18.3 18.9 1.03 6.69
July 216 1997 0.086 1978 16.9 35.6 2.11 6.17
August 144 1993 0.208 1988 7.98 21.8 2.73 2.92
September 28.3 1980 0.096 1989 6.62 7.30 1.10 2.42
Annual 50.1 1956 3.11 1961 22.9 14.1 0.62 100
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Monthly and annual flow duration, in cubic feet per second, post-regulation period
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Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
______________________________________________________________________________________________________________________
95 0.97 0.60 0.16 0.47 2.10 0.30 0.13 0.16 0.14 0.47 1.10 0.64 0.47
90 1.20 0.70 0.43 1.90 4.23 1.40 0.45 0.40 0.24 0.69 1.40 1.20 0.67
85 1.30 1.10 1.20 6.34 5.61 1.90 1.10 0.54 0.44 1.00 1.80 1.30 0.96
80 1.60 1.30 1.50 9.74 6.65 3.14 1.50 0.73 0.58 1.30 2.20 1.70 1.40
75 1.80 1.50 1.50 13.0 8.41 3.70 2.10 0.98 0.78 1.50 2.20 1.90 1.90
70 2.00 1.80 1.90 16.9 10.3 4.29 2.10 1.30 1.00 1.80 2.80 2.40 1.90
65 2.00 1.80 3.10 21.5 13.1 5.15 3.27 1.30 1.40 2.20 2.80 2.80 2.89
60 2.40 1.80 3.10 26.8 15.6 5.67 3.70 1.80 1.90 2.70 3.60 3.10 3.30
55 2.40 2.10 4.29 33.2 18.2 7.24 4.19 1.80 2.50 3.30 4.68 3.10 3.90
50 3.00 2.50 5.18 46.7 20.9 8.40 4.73 2.40 2.50 3.30 5.09 3.50 4.32
45 3.30 2.90 5.85 60.4 24.1 10.5 6.04 2.40 3.83 4.00 5.49 4.00 4.75
40 3.30 3.40 8.72 76.7 29.0 12.4 7.10 3.42 4.56 5.17 6.36 4.50 6.14
35 3.70 3.40 13.4 95.0 35.7 14.4 8.09 3.92 5.36 5.84 7.41 4.50 7.15
30 4.10 4.00 18.2 118 44.7 16.4 9.06 4.57 6.82 6.55 7.89 5.70 9.49
25 4.50 4.00 25.0 147 57.2 20.5 12.3 5.29 7.80 7.74 9.43 5.70 12.6
20 4.50 4.00 32.7 183 73.7 26.2 15.9 7.42 9.71 9.93 11.0 6.50 16.8
15 5.00 5.90 42.8 261 100 34.0 21.1 9.73 12.5 12.8 13.9 7.95 24.7
10 5.60 6.91 56.1 381 157 48.7 29.9 13.0 16.9 15.7 16.6 9.57 43.8
5 6.80 11.5 116 511 283 74.9 53.9 19.9 24.6 21.3 21.3 13.3 108
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Probability of annual high discharges, post-regulation period
[ng, statistic not given]
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Maximum average discharge
(ft3/s)1
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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 12.3 211.8 10.9 8.45 5.87
0.95 1.05 34.5 233.7 32.3 23.9 16.4
0.90 1.11 56.9 255.7 54.2 39.6 27.1
0.80 1.25 100 298.0 95.8 69.4 47.3
0.50 2 261 2251 242 177 121
0.20 5 582 2560 502 380 261
0.10 10 836 789 682 532 368
0.04 25 1,180 1,030 900 727 507
0.02 50 1,450 1,190 1,050 870 610
0.01 100 1,710 1,330 1,190 1,010 711
0.005 200 1,970 1,460 1,310 1,140 808
0.002 500 2,310 ng ng ng ng
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1 Statistics computed using period of daily value
record 1955-82.
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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 18 48.70 11,800 1975 April 25 10.38 76.0
1952 April 1 38.48 260 1976 April 9 13.31 313
1953 May 31 35.86 178 1977 July 18 10.40 64.0
1954 June 12 35.53 187 1978 April 10 14.28 429
1955 April 2 13.23 700 1979 April 22 16.75 900
1956 April 19 14.23 1,350 1980 April 6 11.86 180
1957 March 22 6.12 340 1981 March 25 10.73 76.0
1958 July 5 2.38 78.0 1982 April 14 12.95 308
1959 April 5 9.04 485 1983 April 8 12.89 354
1960 April 14 8.67 654 1984 April 14 12.89 33.0
1961 March 27 4.56 60.0 1985 March 20 12.13 243
1962 April 23 7.03 473 1986 March 25 12.35 275
1963 June 12 4.57 210 1987 April 8 13.79 480
1964 June 20 5.38 286 1988 April 6 8.71 38.0
1965 April 14 8.10 580 1989 April 24 9.48 49.0
1966 April 2 7.35 492 1990 April 24 8.82 15.0
1967 May 9 6.28 412 1991 June 19 9.45 35.0
1968 March 27 5.55 160 1992 March 9 10.77 80.0
1969 April 14 7.85 606 1993 July 29 14.11 492
1970 April 29 7.99 567 1994 April 12 14.11 138
1971 April 12 7.75 568 1995 March 21 12.98 341
1972 April 16 5.79 325 1996 April 19 14.21 523
1973 March 24 9.85 118 1997 April 23 16.05 737
1974 April 22 15.61 595
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 April 18 48.70 11,800 1983 April 8 12.89 354
1956 April 19 14.23 1,350 1995 March 21 12.98 341
1979 April 22 16.75 900 1957 March 22 6.12 340
1997 April 23 16.05 737 1972 April 16 5.79 325
1955 April 2 13.23 700 1976 April 9 13.31 313
1960 April 14 8.67 654 1982 April 14 12.95 308
1969 April 14 7.85 606 1964 June 20 5.38 286
1974 April 22 15.61 595 1986 March 25 12.35 275
1965 April 14 8.10 580 1952 April 1 38.48 260
1971 April 12 7.75 568 1985 March 20 12.13 243
1970 April 29 7.99 567 1963 June 12 4.57 210
1996 April 19 14.21 523 1954 June 12 35.53 187
1966 April 2 7.35 492 1980 April 6 11.86 180
1993 July 29 14.11 492 1953 May 31 35.86 178
1959 April 5 9.04 485 1968 March 27 5.55 160
1987 April 8 13.79 480 1994 April 12 14.11 138
1962 April 23 7.03 473 1973 March 24 9.85 118
1978 April 10 14.28 429 1992 March 9 10.77 80.0
1967 May 9 6.28 412 1958 July 5 2.38 78.0
1975 April 25 10.38 76.0 1988 April 6 8.71 38.0
1981 March 25 10.73 76.0 1991 June 19 9.45 35.0
1977 July 18 10.40 64.0 1984 April 14 12.89 33.0
1961 March 27 4.56 60.0 1990 April 24 8.82 15.0
1989 April 24 9.48 49.0
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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]
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Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
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1951 -- -- -- -- -- -- 450.9 586.9 40.7 -- -- -- --
1952 3.54 2.81 2.07 1.25 1.00 4.57 46.8 5.90 1.91 1.24 0.542 0.583 5.97
1953 1.25 0.880 0.065 0.506 0.236 2.03 9.84 18.9 15.5 2.41 4.64 1.68 4.84
1954 2.59 2.52 1.24 0.635 1.09 7.06 36.0 18.5 51.7 4.13 3.09 7.32 11.3
1955 5.54 4.68 1.92 1.23 1.60 1.61 167.5 18.1 22.5 34.9 2.01 1.95 21.8
1956 17.4 4.39 3.03 3.40 4.23 3.92 294.2 208.8 32.7 13.9 4.69 11.8 50.1
1957 5.77 15.8 5.90 2.88 1.50 40.1 28.5 21.5 13.2 6.25 7.78 20.6 14.2
1958 6.21 5.53 3.34 2.21 2.38 9.41 15.6 6.38 3.95 11.9 1.12 0.953 5.77
1959 2.70 2.21 1.70 2.10 1.86 5.54 100.0 20.2 7.91 2.65 0.994 2.45 12.4
1960 3.71 3.06 3.37 2.64 2.03 1.85 196.6 38.2 6.22 2.23 1.09 1.00 21.6
1961 1.76 3.14 1.26 1.37 0.829 13.7 9.20 3.93 0.733 0.465 0.477 0.277 3.11
1962 0.513 2.51 2.00 1.28 0.571 0.494 128.9 81.7 66.8 21.3 9.92 7.42 26.9
1963 9.45 12.8 1.51 4.86 5.22 5.16 11.4 9.50 67.4 17.0 8.44 7.34 13.3
1964 6.18 3.82 6.55 2.01 1.43 0.216 83.2 35.6 78.7 17.8 4.38 11.0 20.8
1965 19.0 10.5 5.41 4.46 2.59 5.58 214.6 107.1 36.4 10.6 5.91 9.67 35.9
1966 14.1 8.21 9.74 5.15 3.04 134.9 206.1 143.9 13.3 31.4 8.20 3.52 48.7
1967 7.71 13.2 4.77 3.05 2.88 35.1 159.0 181.2 1.91 2.94 0.871 3.21 34.8
1968 1.14 4.85 10.2 6.12 5.12 19.9 26.3 38.4 15.9 14.3 7.98 5.27 13.0
1969 7.19 9.02 9.03 2.34 3.25 6.34 256.4 37.3 10.8 7.66 1.17 0.561 29.0
1970 0.783 5.40 7.60 6.40 6.37 5.52 215.6 190.8 46.5 6.45 4.25 3.18 41.6
1971 7.75 14.3 12.9 7.27 2.11 1.88 253.1 39.8 46.7 15.2 2.16 1.09 33.5
1972 2.45 12.3 3.53 2.16 3.45 50.9 110.1 22.6 5.36 5.29 2.50 3.02 18.6
1973 5.73 3.88 3.14 3.43 3.80 36.0 13.7 8.53 4.03 3.51 1.28 0.883 7.37
1974 3.07 3.52 4.37 4.29 3.20 11.4 246.9 224.8 27.3 2.77 0.972 0.653 44.5
1975 4.10 9.31 6.75 5.37 4.52 3.67 31.2 27.6 3.17 3.02 3.34 2.67 8.73
1976 1.46 0.560 0.700 3.99 4.56 4.73 141.8 5.45 30.8 1.79 2.00 1.62 16.4
1977 1.22 2.23 1.95 1.72 1.66 7.09 4.03 4.26 4.30 7.67 1.60 2.08 3.33
1978 3.54 8.24 10.3 3.65 9.07 13.7 205.6 30.8 3.48 0.086 0.805 0.206 23.9
1979 2.87 2.29 1.31 1.65 8.35 19.2 249.7 184.1 23.3 18.2 4.06 20.2 44.6
1980 5.19 5.39 4.90 4.74 4.21 7.27 37.1 1.63 0.828 0.741 9.62 28.3 9.09
1981 30.1 22.7 5.08 4.60 18.7 28.8 47.3 19.9 19.6 6.28 6.63 13.6 18.5
1982 11.0 9.38 2.74 1.29 0.834 12.7 97.9 37.6 27.6 14.8 6.04 7.77 19.1
1983 -- -- -- -- -- 54.6 111.5 18.6 7.82 3.51 1.56 2.85 --
1984 -- -- -- -- -- 2.67 22.1 9.32 7.83 7.86 0.900 3.26 --
1985 -- -- -- -- -- 76.9 56.0 13.0 11.0 12.0 28.9 17.9 --
1986 -- -- -- -- -- 82.3 124.9 68.0 10.8 22.8 10.9 19.6 --
1987 -- -- -- -- -- 39.6 269.7 20.5 7.61 3.28 0.821 1.64 --
1988 -- -- -- -- -- 5.27 14.1 6.81 0.473 0.453 0.208 0.244 --
1989 -- -- -- -- -- 15.5 14.4 4.96 5.04 0.936 1.54 0.096 --
1990 -- -- -- -- -- 1.55 6.27 6.76 6.12 1.95 1.43 1.41 --
1991 -- -- -- -- -- 0.734 0.428 10.5 17.4 6.10 6.29 3.69 --
1992 -- -- -- -- -- 34.4 21.3 15.6 7.66 8.52 3.45 7.19 --
1993 -- -- -- -- -- 20.8 48.0 32.1 23.6 107.3 143.7 25.9 --
1994 -- -- -- -- -- 40.2 71.7 12.5 3.13 5.16 9.67 4.39 --
1995 -- -- -- -- -- 119.6 153.4 39.2 9.00 17.7 4.72 8.42 --
1996 -- -- -- -- -- 33.8 250.7 143.7 27.5 31.0 8.10 7.31 --
1997 -- -- -- -- -- 15.7 317.8 293.3 20.7 216.4 10.7 8.36 --
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