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Post-regulation period, 1958-97
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Statistics of monthly and annual mean discharges
[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 117 1996 0 m 9.70 22.1 2.28 0.76
November 53.4 1996 0 m 7.47 11.9 1.59 0.58
December 18.8 1987 0 m 3.88 5.37 1.39 0.30
January 14.5 1994 0 m 1.61 2.82 1.75 0.13
February 37.6 1984 0 m 2.70 7.08 2.62 0.21
March 1,200 1995 0 m 177 275 1.55 13.9
April 5,510 1997 2.81 1991 578 1,020 1.76 45.3
May 951 1996 1.43 1988 165 241 1.46 12.9
June 929 1962 0.085 1988 116 182 1.57 9.10
July 1,790 1962 0 1961 168 370 2.21 13.1
August 462 1993 0 m 36.3 90.9 2.50 2.85
September 159 1986 0 m 11.4 29.6 2.59 0.89
Annual 560 1997 2.70 1990 106 122 1.15 100
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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 1.40 0.67 0.05 0 0 0 0 0 0 0
90 0 0 0 6.93 3.19 0.30 0.05 0 0 0 0 0 0
85 0 0 0 12.7 5.30 0.94 0.15 0 0 0 0 0 0
80 0 0 0.07 19.3 8.18 2.00 0.48 0 0 0 0 0 0
75 0 0 0.35 25.9 12.2 4.74 1.00 0.03 0 0 0 0 0.02
70 0 0 0.53 36.3 18.6 7.70 2.99 0.06 0 0 0 0 0.12
65 0 0 0.78 56.7 25.7 11.2 5.06 0.12 0 0 0 0 0.28
60 0 0 1.70 77.3 33.3 15.8 7.24 0.24 0.02 0 0 0.19 0.64
55 0.18 0.06 4.23 107 41.6 20.2 11.7 0.50 0.10 0.02 0.09 0.86 1.50
50 0.36 0.16 9.73 137 51.7 27.0 17.1 1.00 0.18 0.06 0.34 1.40 2.99
45 0.45 0.30 16.5 168 62.9 34.9 22.9 2.00 0.25 0.15 2.30 1.80 5.38
40 0.70 0.40 22.8 210 78.5 43.6 30.6 4.26 0.49 0.28 4.41 2.30 8.59
35 1.10 0.55 28.9 258 95.7 55.5 43.4 7.43 0.93 0.94 5.57 3.00 13.8
30 1.40 0.55 36.8 317 121 72.2 60.8 14.6 1.80 2.30 7.45 4.36 21.5
25 1.70 0.74 53.9 411 154 96.6 88.7 23.0 4.82 6.28 9.61 5.38 32.7
20 2.10 1.00 91.0 566 211 137 144 37.7 10.2 11.4 13.9 6.66 52.0
15 2.70 2.51 170 894 302 195 226 54.4 17.2 20.3 19.1 8.71 91.4
10 4.84 4.38 426 1,480 417 282 339 85.5 32.0 31.1 24.6 11.6 186
5 7.18 8.13 1,200 3,000 746 544 1,020 180 58.0 48.3 35.0 18.1 444
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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 15.6 11.0 8.70 7.14 6.12
0.95 1.05 63.9 49.0 38.1 28.9 22.4
0.90 1.11 128 102 79.1 58.1 43.3
0.80 1.25 282 235 182 130 92.6
0.50 2 1,100 974 771 533 359
0.20 5 3,520 3,280 2,700 1,870 1,220
0.10 10 6,030 5,710 4,830 3,380 2,210
0.04 25 10,100 9,750 8,520 6,090 4,010
0.02 50 13,800 13,400 12,000 8,700 5,770
0.01 100 17,900 17,400 15,900 11,800 7,910
0.005 200 22,300 21,900 20,400 15,400 10,400
0.002 500 28,800 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
1933 March 13 4.10 75.0 1966 March 19 18.43 2,850
1934 April 7 2.10 15.0 1967 June 17 14.17 2,050
1935 March 16 10.21 513 1968 April 28 2.53 127
1936 March 22 8.00 415 1969 April 11 24.58 9,540
1937 April 9 8.71 540 1970 June 17 4.18 556
1938 March 17 7.28 318 1971 July 4 4.18 508
1939 March 25 15.17 1,350 1972 March 18 14.69 2,100
1940 April 8 3.20 300 1973 March 17 3.67 426
1941 June 11 3.90 608 1974 April 12 4.73 630
1942 June 10 3.77 579 1975 July 4 19.16 3,500
1943 April 2 21.02 5,500 1976 March 24 6.90 870
1944 July 7 6.58 956 1977 September 27 2.41 91.0
1945 March 19 15.00 2,840 1978 March 30 20.03 4,900
1946 March 24 13.07 2,320 1979 April 15 22.39 6,000
1947 April 12 -- 2,450 1980 April 1 12.22 1,800
1948 April 11 4.66 729 1981 April 2 1.69 25.8
1949 April 3 5.60 650 1982 April 1 11.62 1,550
1950 April 3 16.28 2,300 1983 March 19 2.79 265
1951 April 6 11.95 1,890 1984 March 29 16.74 2,970
1952 April 12 20.62 5,400 1985 June 3 9.01 1,210
1953 May 29 14.45 2,500 1986 March 28 14.07 2,210
1954 July 2 5.93 800 1987 March 27 5.34 701
1955 April 1 5.76 550 1988 March 10 2.33 105
1956 April 12 6.17 750 1989 April 7 23.27 7,150
1957 April 19 3.47 408 1990 April 2 2.12 74.0
1958 April 9 3.03 262 1991 July 5 3.72 410
1959 June 17 2.84 222 1992 June 18 8.32 1,000
1960 April 6 5.00 640 1993 April 1 17.52 3,630
1961 March 3 2.20 36.0 1994 July 23 12.83 2,430
1962 July 9 18.38 3,610 1995 March 30 18.18 3,730
1963 June 13 10.21 1,460 1996 May 20 16.18 3,260
1964 April 17 3.65 415 1997 April 16 -- 9,470
1965 April 12 16.50 2,820
Annual peak discharge, from highest to lowest, and corresponding gage height
1969 April 11 24.58 9,540 1962 July 9 18.38 3,610
1997 April 16 -- 9,470 1975 July 4 19.16 3,500
1989 April 7 23.27 7,150 1996 May 20 16.18 3,260
1979 April 15 22.39 6,000 1984 March 29 16.74 2,970
1943 April 2 21.02 5,500 1966 March 19 18.43 2,850
1952 April 12 20.62 5,400 1945 March 19 15.00 2,840
1978 March 30 20.03 4,900 1965 April 12 16.50 2,820
1995 March 30 18.18 3,730 1953 May 29 14.45 2,500
1993 April 1 17.52 3,630 1947 April 12 -- 2,450
1994 July 23 12.83 2,430 1970 June 17 4.18 556
1946 March 24 13.07 2,320 1955 April 1 5.76 550
1950 April 3 16.28 2,300 1937 April 9 8.71 540
1986 March 28 14.07 2,210 1935 March 16 10.21 513
1972 March 18 14.69 2,100 1971 July 4 4.18 508
1967 June 17 14.17 2,050 1973 March 17 3.67 426
1951 April 6 11.95 1,890 1936 March 22 8.00 415
1980 April 1 12.22 1,800 1964 April 17 3.65 415
1982 April 1 11.62 1,550 1991 July 5 3.72 410
1963 June 13 10.21 1,460 1957 April 19 3.47 408
1939 March 25 15.17 1,350 1938 March 17 7.28 318
1985 June 3 9.01 1,210 1940 April 8 3.20 300
1992 June 18 8.32 1,000 1983 March 19 2.79 265
1944 July 7 6.58 956 1958 April 9 3.03 262
1976 March 24 6.90 870 1959 June 17 2.84 222
1954 July 2 5.93 800 1968 April 28 2.53 127
1956 April 12 6.17 750 1988 March 10 2.33 105
1948 April 11 4.66 729 1977 September 27 2.41 91.0
1987 March 27 5.34 701 1933 March 13 4.10 75.0
1949 April 3 5.60 650 1990 April 2 2.12 74.0
1960 April 6 5.00 640 1961 March 3 2.20 36.0
1974 April 12 4.73 630 1981 April 2 1.69 25.8
1941 June 11 3.90 608 1934 April 7 2.10 15.0
1942 June 10 3.77 579
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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
__________________________________________________________________________________________________________________________________
1932 -- -- -- -- -- -- -- 5.80 3.26 0.706 0 0 --
1933 0 0 0 0 0.429 33.2 14.7 7.48 1.82 0 0 0 4.84
1934 0 0 0 0 0 0.316 3.71 0.110 1.35 0.355 0 0 .482
1935 0 0 0 0 0 152.7 20.0 12.7 42.2 20.0 5.00 1.00 21.4
1936 0 0 0 0 0 80.4 55.6 13.0 0.357 0 0 0 12.5
1937 0 0 0 0 0 0 117.5 85.1 20.9 18.0 3.89 2.00 20.6
1938 0 0 0 0 0 86.1 12.6 33.3 9.33 0.361 0 0 12.0
1939 0 0 0 0 0 223.0 45.8 3.21 23.4 23.4 1.85 0 27.0
1940 0 0 0 0 0 0 71.6 19.4 2.39 0.003 0 0 7.70
1941 0 0 0 0 0 79.1 63.5 18.9 78.0 12.2 4.50 9.96 22.2
1942 7.31 5.64 3.18 0.074 0 15.0 66.4 151.4 299.6 75.9 45.1 100.1 64.1
1943 110.9 60.4 19.2 6.69 1.83 232.6 1,767 174.2 706.9 353.5 51.5 22.6 290.8
1944 7.22 11.6 5.75 0.506 0.369 20.7 148.0 168.6 243.4 463.5 134.3 86.1 107.9
1945 19.6 32.4 12.8 0.890 1.25 1,006 412.5 130.4 157.4 15.8 4.19 2.19 150.8
1946 2.08 2.62 0.694 0 0 537.5 202.6 27.0 8.21 30.6 2.53 0.120 68.5
1947 5.27 6.89 2.09 0.961 0.243 52.8 716.9 158.4 74.5 22.1 0.606 0 86.2
1948 0 0 0 0 0 3.78 217.2 19.6 6.29 5.58 7.16 0.060 21.4
1949 0 0 0 0 0 32.6 150.3 25.0 7.13 95.0 13.3 0 27.0
1950 0 0 0 0 0 176.6 812.9 593.8 57.5 7.65 1.73 0 137.8
1951 0 0 0 0 0 14.6 583.5 41.0 27.1 19.8 0.458 0.957 56.7
1952 1.59 4.22 9.19 1.19 0.703 0.500 2,352 279.1 22.4 29.4 4.68 0.373 222.6
1953 0 0.483 1.20 0.726 0.993 95.4 39.7 272.5 321.7 47.5 6.25 0.197 65.8
1954 0 0 0.068 0.048 0.271 44.2 41.4 31.8 66.0 48.5 0.471 1.54 19.6
1955 0.268 0.257 0.977 0.194 0.029 23.1 106.4 3.33 1.29 1.93 16.9 0.020 12.8
1956 0 0 0 0 0 0 195.7 35.8 2.94 0 3.60 0 19.6
1957 0 0 0 0 0 46.0 95.7 58.0 80.8 47.5 21.6 79.8 35.8
1958 31.8 27.0 10.4 2.76 3.26 37.5 159.6 74.1 16.1 25.8 0.084 0.030 32.4
1959 0 0 0 0 0 11.9 6.70 2.93 23.2 4.05 0 0 4.06
1960 0 0 0 0 0 20.5 206.8 54.0 5.07 2.94 0.087 0 23.9
1961 0 0 0 0 0 21.1 8.58 10.4 1.03 0 0 0 3.46
1962 0 0 0 0 0 0 646.8 727.8 929.0 1,787 324.6 16.5 372.0
1963 6.35 7.64 2.88 0.171 0 43.0 87.0 40.0 453.4 20.3 2.12 0.120 54.8
1964 0 0 0 0 0 16.4 150.5 92.8 28.6 14.9 1.36 0.673 25.4
1965 0 0 0 0 0 0 732.3 95.8 109.5 79.0 22.8 3.67 86.3
1966 12.5 4.29 3.70 1.40 0.229 902.5 333.7 107.5 63.6 59.2 189.7 22.8 143.3
1967 8.07 17.0 6.15 1.89 0.741 197.9 324.6 197.7 481.0 241.2 29.0 0.584 125.6
1968 0.011 1.02 1.22 0.405 0.049 19.3 57.8 51.8 26.0 5.35 1.98 2.95 14.0
1969 7.70 7.31 5.15 0.559 0.299 0.342 3,077 351.6 76.4 60.7 31.0 1.25 298.7
1970 0.061 0.049 2.07 1.71 1.03 18.1 139.4 51.6 177.7 41.9 0.074 0 36.0
1971 0 0 0 0 0 105.8 40.0 11.7 17.3 72.9 0.516 8.06 21.6
1972 2.96 19.5 10.1 2.87 0.687 543.3 281.1 499.4 146.2 50.6 16.1 0.388 132.0
1973 0 2.95 2.50 2.00 0.782 102.4 25.1 10.5 8.78 9.75 0.011 0.118 13.9
1974 5.94 3.98 2.38 0.354 0.232 65.3 151.1 61.6 17.7 0.103 0.046 0 25.8
1975 0 0 0 0 0 0.219 817.8 140.9 378.1 1,144 40.2 3.08 211.1
1976 9.31 14.1 4.65 2.96 24.6 255.3 176.2 25.9 0.726 0.034 0 0 42.9
1977 0 0 0 0 0 7.61 20.9 5.15 3.33 3.21 0.151 11.1 4.27
1978 24.6 9.16 6.08 3.52 2.30 614.4 1,018 146.2 39.8 222.7 45.7 26.7 180.4
1979 5.10 4.09 2.30 0.701 0.500 0.644 1,931 361.9 41.8 63.9 44.1 2.32 203.4
1980 0.138 7.69 4.11 1.75 0.741 118.2 282.6 24.7 55.5 0.935 3.46 0.271 41.4
1981 0.480 0.484 0.955 0.437 3.36 9.67 14.9 2.91 9.21 7.83 1.19 0.002 4.28
1982 0 0 0 0 0 48.8 359.4 25.2 2.39 26.9 1.07 0 38.4
1983 8.12 4.75 5.45 0.891 0.655 107.6 36.5 6.17 0.093 17.7 0.863 7.33 16.5
1984 0.390 0.126 0.025 0.052 37.6 588.0 472.0 64.0 126.0 3.79 1.09 0.001 107.7
1985 18.8 10.3 5.94 1.76 0.682 204.0 30.1 21.0 198.7 8.98 0.052 3.49 42.1
1986 0.225 0.033 2.34 1.98 1.16 433.0 884.0 682.3 67.6 22.0 15.6 159.4 189.7
1987 71.6 37.5 18.8 6.94 6.32 165.3 114.8 41.4 11.5 7.78 0.223 0.005 40.5
1988 0 0 0 0 0 28.9 11.9 1.43 0.085 4.10 1.14 0 3.99
1989 0 0 0 0 0 3.66 1808 69.7 37.4 2.09 1.07 0.305 158.2
1990 0.012 0 0 0 0 8.57 14.9 7.91 0.906 0.023 0 0 2.70
1991 0 0 0 0 0 7.69 2.81 27.1 12.7 69.2 4.39 9.57 11.3
1992 0.036 0.010 0.064 0.068 .582 31.0 44.7 23.0 228.2 105.1 25.7 2.20 38.3
1993 0.020 2.12 0.644 0 2.24 250.1 766.4 114.7 152.7 902.4 462.2 99.3 231.0
1994 29.5 18.7 18.6 14.5 9.82 621.1 741.7 241.8 34.3 741.6 40.1 12.2 212.1
1995 22.2 27.5 15.3 7.38 6.92 1,195 717.9 410.9 143.5 646.1 63.0 20.5 275.7
1996 117.3 53.4 16.9 6.06 2.55 283.5 924.6 950.6 337.0 49.7 10.7 0.412 229.5
1997 4.85 17.9 6.35 1.10 0.635 1.08 5,510 751.2 188.4 179.5 71.9 41.5 559.6
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