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Post-regulation period, 1950-97
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Statistics of monthly and annual mean discharges, post-regulation period
[m, more than 1 year of occurrence]
__________________________________________________________________________________________________________
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 69.9 1983 0 m 6.33 14.0 2.22 0.78
November 31.3 1981 0 m 4.08 6.09 1.49 0.50
December 17.4 1983 0 m 2.81 3.98 1.42 0.34
January 13.9 1983 0 m 1.74 2.96 1.70 0.21
February 45.7 1981 0 m 3.05 6.89 2.26 0.37
March 654 1995 0 1991 72.9 134 1.84 8.95
April 2,050 1950 0 1991 450 493 1.10 55.3
May 2,070 1950 2.33 1961 153 326 2.13 18.7
June 576 1964 0 1961 53.8 90.6 1.68 6.60
July 441 1997 0 1990 40.3 91.1 2.26 4.95
August 569 1993 0 m 17.7 81.7 4.62 2.17
September 151 1957 0 m 9.17 25.2 2.74 1.13
Annual 353 1950 1.38 1990 67.7 66.7 0.98 100
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Monthly and annual flow duration, in cubic feet per second, post-regulation period
______________________________________________________________________________________________________________________
Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
______________________________________________________________________________________________________________________
95 0 0 0 3.81 2.27 0.13 0 0 0 0 0 0 0
90 0 0 0 7.45 3.61 0.82 0.09 0 0 0 0 0 0
85 0 0 0.08 10.4 5.47 2.78 0.09 0 0 0 0 0 0
80 0 0 0.16 14.5 8.77 4.11 0.42 0 0 0 0.03 0.03 0.08
75 0 0 0.32 19.7 12.4 6.20 0.60 0.06 0 0 0.05 0.09 0.08
70 0 0.09 0.64 27.0 16.4 8.33 1.30 0.09 0.04 0.03 0.10 0.09 0.18
65 0.05 0.16 0.91 36.4 20.5 10.4 1.90 0.18 0.08 0.08 0.16 0.19 0.42
60 0.10 0.16 1.80 50.2 24.8 14.2 3.24 0.26 0.08 0.08 0.21 0.19 0.96
55 0.19 0.42 2.66 70.1 30.2 17.6 4.60 0.38 0.11 0.15 0.44 0.39 1.50
50 0.19 0.78 3.36 93.8 35.5 21.1 6.60 0.54 0.16 0.20 0.95 0.64 2.49
45 0.37 0.78 4.18 122 44.5 25.0 8.48 0.78 0.23 0.27 1.20 1.00 3.58
40 0.72 1.50 5.84 168 54.0 29.5 11.0 1.60 0.46 0.50 1.60 1.30 5.48
35 0.91 1.50 7.83 233 68.1 34.2 15.1 2.49 0.92 1.20 2.00 2.20 7.85
30 1.40 2.00 9.24 306 83.3 39.6 19.1 3.63 1.30 1.70 3.35 2.20 11.0
25 1.80 2.77 13.6 393 109 45.0 23.6 5.15 3.13 3.06 5.65 3.58 16.7
20 2.20 3.41 20.9 526 148 58.0 31.2 7.30 4.23 4.77 7.67 5.38 26.5
15 3.50 4.21 74.1 764 213 80.2 45.2 12.0 6.29 7.65 9.55 7.48 44.1
10 5.67 7.16 166 1,280 319 120 71.1 21.4 16.4 16.8 13.1 8.34 91.3
5 9.19 10.5 551 2,370 600 221 161 42.7 45.8 32.9 18.3 12.3 273
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Probability of annual high discharges, post-regulation period
[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 12.3 5.16 4.40 3.81 3.00
0.95 1.05 56.3 32.5 26.8 21.2 15.3
0.90 1.11 118 77.5 63.1 47.9 33.5
0.80 1.25 272 202 162 118 79.6
0.50 2 1,120 941 744 511 330
0.20 5 3,640 3,090 2,440 1,610 1,030
0.10 10 6,190 5,070 4,000 2,630 1,680
0.04 25 10,300 7,870 6,240 4,080 2,620
0.02 50 13,800 10,000 7,970 5,200 3,370
0.01 100 17,500 12,100 9,660 6,310 4,130
0.005 200 21,600 14,100 11,300 7,390 4,880
0.002 500 27,100 ng ng ng ng
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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
11882 -- 16.00 -- 1964 June 20 14.01 2,140
11897 April 15 18.14 3,480 1965 April 13 18.21 5,710
11916 April 17.64 3,140 1966 April 4 16.08 2,790
1932 April 10 -- 750 1967 May 9 14.46 2,290
1933 April 2 15.20 2,200 1968 March 28 9.85 630
1934 April 9 6.61 393 1969 April 13 18.13 4,990
1935 March 28 8.34 443 1970 April 29 12.09 1,520
1936 April 14 13.68 1,200 1971 April 10 16.42 3,600
1937 April 10 8.21 380 1972 April 14 14.30 2,150
1938 March 21 6.12 291 1973 March 27 8.82 251
1939 March 30 7.68 150 1974 April 16 17.03 3,660
1940 April 20 5.83 210 1975 April 17 11.10 900
1941 April 13 13.04 1,830 1976 April 4 14.06 2,000
1942 April 6 15.46 4,310 1977 May 5 7.57 40.0
1943 March 28 13.15 1,430 1978 April 8 17.10 3,700
1944 April 12 5.55 563 1979 April 22 19.56 8,740
1945 March 16 10.88 1,180 1980 April 7 9.09 399
1946 March 23 11.40 1,490 1981 April 3 9.51 471
1947 April 4 9.70 520 1982 April 1 12.26 1,420
1948 April 19 20.06 11,700 1983 March 7 12.34 1,360
1949 April 11 16.94 2,530 1984 March 27 8.72 269
1950 April 19 20.13 12,600 1985 March 19 9.74 1,000
1951 April 6 13.34 1,640 1986 March 24 9.48 859
1952 April 5 6.66 180 1987 April 7 13.44 3,220
1953 June 5 5.45 125 1988 April 6 7.79 143
1954 June 16 7.24 478 1989 April 24 7.79 143
1955 April 3 16.84 2,100 1990 April 21 7.28 24.0
1956 April 22 16.25 4,200 1991 May 23 7.47 48.0
1957 September 3 10.96 1,300 1992 March 8 9.90 1,030
1958 April 7 5.70 41.0 1993 July 30 12.22 2,420
1959 April 6 12.29 1,200 1994 March 22 10.49 800
1960 April 15 15.40 2,770 1995 March 20 11.82 2,200
1961 April 27 7.51 40.0 1996 April 16 14.53 3,400
1962 April 20 18.27 5,900 1997 April 21 15.40 5,250
1963 June 6 8.78 344
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 April 19 20.13 12,600 1956 April 22 16.25 4,200
1948 April 19 20.06 11,700 1978 April 8 17.10 3,700
1979 April 22 19.56 8,740 1974 April 16 17.03 3,660
1962 April 20 18.27 5,900 1971 April 10 16.42 3,600
1997 April 21 15.40 5,250 11897 April 15 18.14 3,480
1965 April 13 18.21 5,710 1996 April 16 14.53 3,400
1969 April 13 18.13 4,990 1987 April 7 13.44 3,220
1942 April 6 15.46 4,310 11916 April 17.64 3,140
1966 April 4 16.08 2,790 1932 April 10 -- 750
1960 April 15 15.40 2,770 1968 March 28 9.85 630
1949 April 11 16.94 2,530 1944 April 12 5.55 563
1993 July 30 12.22 2,420 1947 April 4 9.70 520
1967 May 9 14.46 2,290 1954 June 16 7.24 478
1933 April 2 15.20 2,200 1981 April 3 9.51 471
1995 March 20 11.82 2,200 1935 March 28 8.34 443
1972 April 14 14.30 2,150 1980 April 7 9.09 399
1964 June 20 14.01 2,140 1934 April 9 6.61 393
1955 April 3 16.84 2,100 1937 April 10 8.21 380
1976 April 4 14.06 2,000 1963 June 6 8.78 344
1941 April 13 13.04 1,830 1938 March 21 6.12 291
1951 April 6 13.34 1,640 1984 March 27 8.72 269
1970 April 29 12.09 1,520 1973 March 27 8.82 251
1946 March 23 11.40 1,490 1940 April 20 5.83 210
1943 March 28 13.15 1,430 1952 April 5 6.66 180
1982 April 1 12.26 1,420 1939 March 30 7.68 150
1983 March 7 12.34 1,360 1988 April 6 7.79 143
1957 September 3 10.96 1,300 1989 April 24 7.79 143
1936 April 14 13.68 1,200 1953 June 5 5.45 125
1959 April 6 12.29 1,200 1991 May 23 7.47 48.0
1945 March 16 10.88 1,180 1958 April 7 5.70 41.0
1992 March 8 9.90 1,030 1961 April 27 7.51 40.0
1985 March 19 9.74 1,000 1977 May 5 7.57 40.0
1975 April 17 11.10 900 1990 April 21 7.28 24.0
1986 March 24 9.48 859 11882 -- 16.00 --
1994 March 22 10.49 800
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1Determined by U.S. Army Corps of Engineers; not used in
statistics.
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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
__________________________________________________________________________________________________________________________________
1931 -- -- -- -- -- -- -- 12.5 3.04 0.984 0.194 0.100 --
1932 0.100 0.400 0.100 0 2.00 15.0 185.0 21.7 5.58 0.268 0 0 19.0
1933 1.00 0.800 0 0 0 40.0 411.4 22.3 12.2 0.500 0.200 0 40.3
1934 0 0 0 0 0.050 15.0 78.0 2.16 0.413 0.013 0 0.080 7.91
1935 0 0 0 0 0 68.9 65.9 6.07 3.91 2.00 0.500 0 12.3
1936 0 0 0 0 0 0 227.0 12.0 13.0 0.035 0 0 20.7
1937 0 0 0 0 0 0 90.2 21.1 3.69 4.75 1.17 0 10.0
1938 0 0 0 0 0 53.7 5.40 5.88 0.347 4.71 0 0 5.93
1939 0 0 0 0 0 8.77 23.7 2.05 2.83 0.123 0 0 3.11
1940 0 0 0 0 0 0 38.0 4.20 0.377 0.135 0.271 0 3.54
1941 0 0 0 0 0 0.377 577.3 17.6 12.0 1.48 0.232 31.8 52.7
1942 32.7 8.40 3.12 0 0 119.7 872.8 59.6 16.4 3.48 3.38 3.29 92.9
1943 0.274 0.727 0.045 0.097 0.107 256.4 170.1 30.1 202.3 150.6 12.7 0.253 68.9
1944 0.016 0.750 0.706 0.006 0 0.326 111.0 7.11 8.32 2.42 11.4 7.81 12.4
1945 0.835 14.5 6.99 0.265 0.229 410.0 134.3 56.7 31.5 7.34 0.845 0.610 55.9
1946 0.161 0.210 0.139 0.100 0.125 236.7 68.5 9.54 4.93 1.27 0.129 0.373 27.2
1947 0.381 0.190 0.039 0 0 4.74 169.8 9.75 20.8 62.0 12.7 3.74 23.6
1948 1.28 2.51 2.41 0.484 0.117 0.465 1,809 217.5 37.8 45.2 30.5 2.33 177.0
1949 0.484 1.03 0.384 0.226 0.200 0.310 768.8 51.4 11.5 2.28 1.15 0.060 69.0
1950 0.387 0.187 0.100 0.100 0.100 0.171 2,051 2,071 65.0 21.2 12.9 1.26 352.9
1951 2.18 1.61 2.11 1.10 0.568 12.1 331.1 33.8 6.43 0.706 2.98 41.3 36.0
1952 34.1 1.33 0.574 0.097 0 0.197 46.9 8.24 0.393 0.226 0 22.1 9.48
1953 0 0.027 0.806 0.206 0 2.22 8.09 5.26 10.1 1.15 0.048 0.197 2.34
1954 0.065 0.690 0.174 0.016 1.49 5.90 16.1 13.6 130.9 19.0 6.04 4.87 16.5
1955 4.87 3.92 1.17 0.200 0.200 0.800 445.3 46.4 76.8 10.5 1.30 11.8 49.8
1956 0.439 0 0 0 0 11.9 1,013 446.8 164.3 19.6 3.38 7.50 138.0
1957 7.23 8.14 3.09 1.58 5.45 57.5 48.0 22.8 10.4 1.88 4.66 151.2 26.7
1958 6.90 7.16 4.33 1.69 1.36 3.63 17.9 3.96 2.68 2.85 0.077 0 4.38
1959 1.26 0 0.190 0.400 0 0.661 243.0 27.0 5.85 3.28 0.032 0.007 23.2
1960 0 0.070 0.065 0.045 0.014 1.04 942.0 34.2 11.3 1.05 0.029 0.423 81.3
1961 0.526 0 0 0 0 3.17 12.6 2.33 0 0.058 0.052 0.040 1.56
1962 0.019 0.857 0.287 0.084 2.92 10.2 716.6 103.3 232.8 18.6 11.0 0.117 90.5
1963 0.248 0.483 0.081 0 0.239 30.3 25.7 8.74 105.3 17.2 8.83 0 16.4
1964 0.416 0.023 0 0.074 0.745 0.729 221.6 58.3 575.9 64.2 2.63 1.16 76.2
1965 6.69 1.99 0.400 0.110 1.48 5.83 892.6 162.7 85.2 22.0 9.93 37.8 101.4
1966 46.1 15.7 9.72 2.09 0.193 297.6 637.5 441.0 84.9 136.0 33.3 2.03 142.9
1967 0.923 1.22 1.88 1.13 1.33 110.5 636.7 513.0 23.3 1.98 0.085 0 107.9
1968 0.032 0.130 0.050 0.024 1.68 83.4 46.4 50.9 23.2 9.40 0.263 0.107 18.1
1969 0.161 0.076 0.115 0.081 2.27 8.02 859.5 30.6 14.5 7.12 0.418 2.25 76.1
1970 0.438 0.089 2.47 0.268 0.125 0.597 633.7 207.7 38.7 15.0 0.291 0.010 74.5
1971 0.013 3.20 0.788 0.010 0.633 17.0 876.1 57.4 75.7 74.7 4.96 0.034 91.7
1972 5.34 6.67 0.426 0.002 3.86 320.9 417.4 57.2 9.56 0.218 0.024 1.91 68.5
1973 0.041 0.075 3.25 0.724 0.311 62.7 28.2 12.4 9.45 0.383 0.918 0.567 10.0
1974 5.47 5.51 7.41 1.60 1.82 8.50 1,078 687.7 100.7 5.58 4.54 0.762 158.7
1975 0.211 4.02 8.68 5.09 3.29 3.63 245.9 145.9 15.4 79.6 0.499 0.274 42.8
1976 0.797 7.36 6.97 5.17 4.55 33.8 542.4 26.7 81.7 3.69 0.400 0.375 58.7
1977 0.229 1.70 2.12 2.19 2.00 6.06 8.83 4.86 1.54 0.127 0.092 0.057 2.48
1978 0.210 2.41 2.50 2.40 1.45 19.8 864.6 98.9 22.4 4.61 0.349 2.02 84.3
1979 0.181 5.23 4.12 0.916 0.768 2.37 1,450 285.0 47.0 54.2 6.20 4.46 153.9
1980 0.311 5.57 4.28 2.44 1.32 2.29 92.4 12.3 24.5 0.669 2.01 39.6 15.4
1981 40.3 31.3 14.1 5.42 45.7 112.5 108.2 28.3 50.7 59.1 9.49 10.7 42.9
1982 8.76 7.50 6.29 5.39 3.38 29.0 497.5 111.5 98.0 254.3 38.6 1.47 88.5
1983 69.9 22.1 17.4 13.9 10.4 399.6 319.9 58.3 74.1 20.4 0.646 0.134 84.3
1984 1.29 4.95 0.974 0.471 1.71 36.7 77.6 21.1 17.1 2.25 1.27 0.059 13.7
1985 2.76 7.67 1.63 0 0.114 217.8 68.5 21.1 13.4 2.26 25.3 2.19 30.6
1986 10.2 7.19 1.27 8.25 11.2 228.1 195.2 106.9 18.2 55.4 23.2 8.35 56.5
1987 0.769 0.484 0.353 0.341 1.98 97.3 988.3 47.5 14.3 9.39 4.60 0.079 96.2
1988 0.072 0.090 0.191 0.116 0.737 3.85 42.6 7.89 5.52 0.980 0.182 0 5.13
1989 0.042 0.040 0.011 0 0.002 2.32 32.5 10.9 1.55 0.291 0.025 0.003 3.96
1990 0.005 0.432 0.093 0.018 0 0.359 9.60 4.42 1.66 0 0 0 1.38
1991 0 0 0 0 0 0 0 5.11 1.68 16.0 2.24 1.13 2.22
1992 1.24 4.49 8.97 10.1 4.74 357.7 217.6 36.1 23.3 5.57 4.35 0.208 56.4
1993 0 0.012 0.232 0.105 10.8 20.7 91.8 59.4 26.9 398.4 568.6 72.8 105.5
1994 27.3 13.8 10.5 6.58 5.85 199.0 221.5 109.5 36.2 21.2 2.10 0.127 54.7
1995 0.305 7.15 2.70 0.824 0.800 654.2 433.0 119.8 29.7 43.0 23.4 4.93 110.8
1996 0.496 0.039 0.055 0.183 6.55 9.28 1,072 494.7 72.0 10.3 6.90 0.393 138.6
1997 14.6 3.12 1.93 2.13 2.29 9.30 1,794 401.1 43.3 440.9 20.7 3.56 227.3
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