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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 622 1995 1.92 1956 53.4 93.5 1.75 2.88
November 291 1995 5.27 1956 65.4 60.5 0.93 3.53
December 231 1995 4.32 1980 63.8 52.9 0.83 3.44
January 182 1995 3.64 1956 60.4 43.8 0.73 3.26
February 300 1996 7.66 1956 70.6 64.6 0.91 3.81
March 1,570 1995 7.81 1955 206 329 1.60 11.1
April 3,330 1997 2.07 1953 618 761 1.23 33.4
May 2,910 1950 6.86 1959 304 512 1.68 16.4
June 1,150 1950 5.88 1958 155 187 1.21 8.34
July 1,270 1993 7.28 1959 123 199 1.62 6.62
August 1,560 1993 6.72 1977 79.6 226 2.84 4.30
September 577 1994 0.807 1955 55.3 102 1.84 2.98
Annual 574 1995 12.8 1991 154 144 0.94 100
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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 8.01 8.30 6.99 2.70 7.57 7.81 7.42 3.90 2.20 2.20 8.74 8.32 6.64
90 10.1 9.62 10.6 8.16 9.19 11.1 9.93 7.91 8.04 7.97 11.2 9.30 9.34
85 15.3 11.9 13.6 9.66 12.1 12.5 11.6 9.39 9.72 9.38 13.6 15.5 11.2
80 20.6 15.6 17.5 12.6 13.6 13.8 13.8 11.4 11.3 11.0 15.6 20.0 13.7
75 24.5 22.3 22.6 16.3 15.5 16.3 15.4 12.9 12.9 12.2 17.8 26.1 16.0
70 26.6 25.0 29.1 34.3 22.1 20.7 17.0 14.5 14.5 13.4 21.0 33.4 18.5
65 38.4 29.8 40.8 55.3 37.1 29.3 20.0 16.0 15.8 14.7 25.4 39.3 22.7
60 44.1 42.4 56.2 84.3 55.1 36.4 22.9 17.8 16.9 16.0 30.8 43.1 28.2
55 48.1 49.2 63.1 128 71.8 48.3 27.2 19.6 18.1 17.4 37.4 46.2 35.3
50 51.8 54.5 70.8 189 104 62.0 32.3 21.4 19.3 18.8 43.4 48.6 43.2
45 55.3 58.4 80.5 270 131 77.5 41.5 24.1 21.1 22.1 48.2 51.0 51.3
40 59.8 62.3 95.1 349 170 95.5 57.0 27.1 24.3 25.8 52.2 53.9 61.5
35 65.0 68.4 120 429 196 116 75.1 30.4 28.5 33.0 56.8 59.9 71.6
30 71.8 74.9 150 563 275 148 95.7 37.3 34.2 40.6 70.9 68.8 91.5
25 81.2 91.3 186 777 325 184 130 46.5 42.6 48.6 91.6 87.4 117
20 95.3 104 223 1,010 386 234 181 61.8 54.8 69.2 103 109 152
15 112 135 270 1,340 507 299 234 98.7 72.4 87.1 120 122 208
10 135 185 378 1,850 734 391 302 159 102 120 143 148 298
5 158 220 979 2,970 1,220 547 447 302 260 192 244 178 606
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Probability of annual high discharges
[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 29.9 15.8 15.0 14.6 14.3
0.95 1.05 105 67.8 60.7 52.4 44.2
0.90 1.11 193 135 119 98.2 77.9
0.80 1.25 378 288 251 200 150
0.50 2 1,150 980 863 676 479
0.20 5 2,790 2,530 2,340 1,910 1,360
0.10 10 4,100 3,770 3,600 3,060 2,250
0.04 25 5,850 5,380 15,060 14,250 13,140
0.02 50 7,140 6,540 16,150 15,170 13,830
0.01 100 8,390 7,630 17,170 16,020 14,450
0.005 200 9,590 8,640 18,120 16,820 15,050
0.002 500 11,100 ng ng ng ng
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1 Statistical adjustment based on correlation between
3-, 7-, 15-, and 30-consecutive-day periods.
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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)
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Annual peak discharge, by year, and corresponding gage height
1948 April 27 -- 4,600 1974 April 21 30.02 1,940
1950 May 23 32.62 3,150 1975 April 29 29.20 1,640
1951 April 19 28.00 1,270 1976 April 10 27.99 982
1952 August 29 -- 400 1977 October 1 26.16 37.0
1953 July 16 29.40 1,980 1978 April 7 28.55 1,370
1954 March 11 28.28 1,270 1979 April 24 36.26 4,740
1955 April 13 28.86 1,640 1980 April 3 27.38 516
1956 April 26 30.25 2,070 1981 April 3 27.37 493
1957 September 4 27.50 598 1982 April 12 30.01 1,930
1958 July 17 -- 240 1983 March 9 29.91 1,910
1959 November 18 26.83 190 1984 April 3 29.50 1,790
1960 April 17 29.24 1,570 1985 May 16 27.73 680
1961 November 27 27.88 697 1986 April 19 30.22 2,050
1962 April 10 27.67 778 1987 April 14 30.51 2,200
1963 November 15 26.30 56.0 1988 January 19 26.84 146
1964 June 28 27.51 679 1989 April 4 27.60 642
1965 April 14 32.69 2,980 1990 September 13 26.75 123
1966 March 28 32.72 3,250 1991 July 25 26.60 82.0
1967 April 9 29.00 1,560 1992 March 7 28.57 1,260
1968 June 11 27.92 974 1993 July 28 34.98 3,720
1969 April 19 35.47 4,580 1994 April 2 29.28 1,630
1970 April 19 28.23 1,230 1995 March 28 34.15 3,980
1971 April 20 29.75 1,830 1996 April 20 36.46 5,460
1972 April 26 27.82 991 1997 April 27 35.12 4,510
1973 March 29 26.50 90.0
Annual peak discharge, from highest to lowest, and corresponding gage height
1996 April 20 36.46 5,460 1994 April 2 29.28 1,630
1979 April 24 36.26 4,740 1960 April 17 29.24 1,570
1948 April 27 -- 4,600 1967 April 9 29.00 1,560
1969 April 19 35.47 4,580 1978 April 7 28.55 1,370
1997 April 27 35.12 4,510 1951 April 19 28.00 1,270
1995 March 28 34.15 3,980 1954 March 11 28.28 1,270
1993 July 28 34.98 3,720 1992 March 7 28.57 1,260
1966 March 28 32.72 3,250 1970 April 19 28.23 1,230
1950 May 23 32.62 3,150 1972 April 26 27.82 991
1965 April 14 32.69 2,980 1976 April 10 27.99 982
1987 April 14 30.51 2,200 1968 June 11 27.92 974
1956 April 26 30.25 2,070 1962 April 10 27.67 778
1986 April 19 30.22 2,050 1961 November 27 27.88 697
1953 July 16 29.40 1,980 1985 May 16 27.73 680
1974 April 21 30.02 1,940 1964 June 28 27.51 679
1982 April 12 30.01 1,930 1989 April 4 27.60 642
1983 March 9 29.91 1,910 1957 September 4 27.50 598
1971 April 20 29.75 1,830 1980 April 3 27.38 516
1984 April 3 29.50 1,790 1981 April 3 27.37 493
1955 April 13 28.86 1,640 1952 August 29 -- 400
1975 April 29 29.20 1,640 1958 July 17 -- 240
1958 November 18 26.83 190 1991 July 25 26.60 82.0
1988 January 19 26.84 146 1963 November 15 26.30 56.0
1990 September 13 26.75 123 1976 October 1 26.16 37.0
1973 March 29 26.50 90.0
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Monthly and annual mean discharges, in cubic feet per second--Continued[Data werenot rounded in accordance with U.S. Geological Survey publication standards] --------------------------------------------------------------------------------------------------------------------------- Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual --------------------------------------------------------------------------------------------------------------------------- 1950 2.50 25.0 18.3 10.6 10.2 50.0 1,730 2,906 1,154 245.5 68.2 3.46 520.6 1951 13.1 26.5 27.3 25.7 23.6 39.6 547.1 319.8 89.8 46.9 23.7 28.9 100.9 1952 50.0 15.0 14.9 24.6 29.0 14.7 2.63 13.6 14.3 13.0 21.6 16.6 19.2 1953 13.6 10.8 14.8 24.1 23.7 8.26 2.07 12.7 77.4 123.6 8.68 13.4 27.8 1954 19.3 19.9 41.3 60.3 56.3 80.7 132.2 36.4 165.6 215.5 30.9 49.5 75.6 1955 39.4 102.0 103.2 84.3 32.0 7.81 247.7 64.0 238.0 223.7 12.6 0.807 96.3 1956 1.92 5.27 7.64 3.64 7.66 63.3 374.4 354.9 275.2 51.9 12.9 3.89 96.6 1957 7.75 33.9 53.6 57.4 68.4 44.8 17.9 36.9 63.3 39.7 34.1 271.9 60.3 1958 98.8 120.0 82.3 80.1 68.1 67.6 41.3 17.9 5.88 75.8 14.3 15.9 57.4 1959 18.0 33.4 43.1 42.1 34.9 26.5 8.95 6.86 7.90 7.28 8.53 9.40 20.5 1960 10.1 17.3 28.0 24.2 22.3 16.8 668.9 77.2 152.6 26.3 14.3 14.4 88.4 1961 13.4 36.4 46.9 45.2 38.7 18.9 10.9 13.5 13.6 14.1 13.7 12.4 23.1 1962 14.3 14.5 15.0 15.0 14.7 67.9 300.4 137.2 219.4 89.0 26.1 14.7 77.2 1963 16.3 40.8 50.9 48.8 46.0 30.9 10.1 12.3 12.0 7.93 8.35 8.66 24.3 1964 8.94 25.3 36.5 25.4 17.8 11.4 10.0 9.50 212.5 135.6 13.5 30.2 44.6 1965 26.7 51.3 50.3 55.7 50.6 147.5 1,224 215.9 94.1 187.9 125.7 67.5 190.7 1966 109.9 104.8 110.6 104.4 65.6 1,067 623.1 277.6 183.5 172.0 208.8 63.8 259.3 1967 17.5 49.8 77.8 72.1 150.9 164.7 972.0 474.0 49.1 31.6 18.9 17.1 173.8 1968 14.5 27.1 42.7 43.5 46.8 42.2 142.7 130.5 225.1 28.3 17.1 18.3 64.6 1969 23.1 54.2 51.9 69.1 200.2 165.9 1,936 313.5 91.3 127.2 13.7 14.1 252.5 1970 18.3 37.4 48.6 53.2 87.6 146.4 420.3 329.7 333.0 32.5 15.2 13.2 127.5 1971 11.3 21.5 40.4 40.5 104.5 215.1 686.3 158.2 222.6 182.5 25.2 24.5 143.7 1972 46.4 127.6 156.5 125.0 48.1 192.8 794.6 335.2 218.6 18.2 16.8 18.6 174.3 1973 13.4 44.1 49.0 55.2 62.7 61.5 31.5 15.5 15.2 9.83 17.8 14.7 32.4 1974 20.0 43.4 37.5 70.4 180.1 219.1 920.8 684.4 507.5 17.0 16.3 13.4 226.3 1975 10.9 32.2 52.1 55.5 56.4 68.3 668.4 830.5 227.4 119.5 56.3 18.6 183.5 1976 29.2 52.0 69.5 78.1 68.3 64.3 493.3 106.7 18.0 17.7 24.1 36.1 87.5 1977 32.2 23.3 16.7 14.6 9.20 9.94 9.27 9.07 8.53 8.63 6.72 8.09 13.1 1978 11.0 32.7 45.2 63.0 104.1 143.7 703.4 128.7 41.8 19.2 20.3 39.1 111.7 1979 66.6 51.3 36.2 30.8 56.4 172.9 1,796 1,346 156.7 146.2 52.7 27.8 328.5 1980 93.8 156.4 4.32 10.4 10.9 83.1 153.2 9.32 19.4 17.4 10.1 152.0 59.6 1981 127.2 94.9 23.5 9.10 9.61 98.2 136.5 70.2 136.2 84.6 25.7 43.0 71.7 1982 152.7 134.6 8.61 7.93 32.3 173.8 892.4 233.3 176.7 226.9 56.9 14.2 175.6 1983 144.7 237.9 113.5 119.6 76.4 1,236 659.0 202.8 219.1 117.1 41.3 77.0 271.7 1984 106.2 140.4 133.7 78.3 64.0 256.8 911.6 351.0 113.9 33.4 37.1 41.0 188.4 1985 102.9 48.5 51.1 28.1 11.7 96.4 142.2 117.5 77.6 23.3 44.0 23.8 64.2 1986 31.6 98.6 142.9 140.4 197.9 166.5 391.2 307.2 51.1 66.5 60.9 28.2 139.8 1987 15.2 111.4 190.9 124.1 78.2 969.6 1,268 155.8 109.5 215.4 215.6 66.8 294.1 1988 89.7 96.4 110.0 117.9 112.4 58.2 17.7 52.0 30.6 18.4 25.4 12.0 61.7 1989 13.3 23.8 35.5 45.8 56.2 107.4 198.3 19.8 25.4 21.7 24.9 20.0 49.1 1990 33.0 23.1 22.1 13.3 12.2 14.8 10.0 7.35 10.1 13.3 44.9 57.2 21.8 1991 5.72 9.21 8.24 7.78 8.54 7.96 7.93 11.7 14.9 26.7 29.0 15.8 12.8 1992 12.2 26.0 55.8 45.7 18.4 448.5 86.2 40.0 32.3 60.5 30.9 29.7 74.5 1993 15.2 9.36 44.5 76.3 93.9 214.9 263.7 193.3 131.4 1,272 1,555 353.1 355.8 1994 118.6 152.9 127.6 98.0 181.6 427.7 718.7 163.0 404.9 538.5 192.1 576.8 307.7 1995 621.9 290.8 230.8 181.6 167.3 1,567 1,998 797.9 285.9 246.8 292.5 188.3 574.4 1996 70.5 75.9 104.7 124.8 300.1 336.9 2,969 953.2 294.5 248.1 107.9 19.6 464.0 1997 32.1 131.8 187.5 168.1 172.7 187.1 3,329 1,540 192.2 224.6 82.1 45.6 522.9 ---------------------------------------------------------------------------------------------------------------------------
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