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Last update: Tuesday, 24-Aug-2004 12:38:26 EDT
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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 151 1974 11.6 1979 39.1 30.9 0.79 4.26
November 176 1972 12.2 1977 36.9 27.8 0.75 4.01
December 63.8 1972 10.6 1977 25.2 12.3 0.49 2.74
January 54.7 1981 9.94 1962 21.1 9.83 0.47 2.30
February 99.6 1981 9.88 1949 21.9 13.9 0.63 2.38
March 434 1966 15.0 1969 85.9 85.9 1.00 9.34
April 1,040 1997 33.3 1981 268 203 0.76 29.2
May 372 1985 21.5 1977 130 88.7 0.68 14.1
June 530 1962 12.7 1977 99.3 92.7 0.93 10.8
July 784 1993 10.1 1976 101 150 1.48 11.0
August 472 1955 5.87 1976 52.1 88.9 1.70 5.67
September 182 1957 8.52 1976 38.3 33.9 0.89 4.17
Annual 175 1997 16.7 1977 76.7 36.4 0.47 100
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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 11.2 11.3 14.3 35.4 30.4 18.9 11.4 8.21 9.21 12.5 14.8 12.5 11.6
90 12.3 12.4 16.0 47.0 37.7 24.0 15.6 10.2 11.4 14.2 16.6 13.4 13.9
85 12.9 13.1 17.6 55.5 43.0 28.6 18.5 12.4 13.1 16.1 18.3 14.1 15.5
80 13.5 13.9 19.3 64.8 48.0 32.9 21.1 14.4 14.8 17.6 19.9 14.9 17.4
75 14.0 14.4 21.1 77.2 54.2 37.4 23.8 16.5 16.3 19.2 21.7 16.0 19.3
70 14.7 14.9 22.7 91.0 61.2 42.3 26.8 18.2 17.8 21.3 22.9 17.3 21.2
65 15.5 15.6 24.5 108 69.0 47.5 30.3 19.8 19.6 23.0 23.9 18.6 23.2
60 16.4 16.6 27.1 127 77.3 52.9 34.1 21.5 21.5 24.4 24.9 19.6 25.5
55 17.3 17.6 29.8 151 86.2 58.8 38.4 23.3 23.5 25.9 25.9 20.7 28.1
50 18.4 18.7 32.5 179 95.0 64.9 43.0 25.6 26.5 27.7 26.9 21.6 31.4
45 19.3 19.8 35.8 206 106 70.9 48.1 28.0 29.4 29.6 29.0 22.8 35.1
40 20.2 20.9 41.4 233 118 77.5 54.9 30.9 31.8 31.8 30.7 24.2 39.2
35 21.7 22.4 52.0 263 133 85.5 63.5 34.1 34.6 34.7 32.9 25.6 46.0
30 24.9 24.3 65.1 302 151 96.5 46.8 38.9 38.3 38.1 36.3 27.8 55.4
25 27.9 27.1 83.3 345 171 111 94.9 45.0 43.0 44.9 41.5 32.6 69.6
20 30.6 28.5 104 402 192 129 118 53.2 50.0 54.0 50.2 37.5 90.1
15 33.4 31.8 137 480 222 156 146 66.4 60.4 67.2 57.5 40.0 122
10 36.4 35.3 215 610 255 198 210 89.6 81.8 83.6 67.9 43.8 177
5 38.9 38.1 350 866 328 267 356 172 124 109 92.3 49.2 288
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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 77.5 69.6 59.0 51.2 46.0
0.95 1.05 158 139 119 99.9 85.3
0.90 1.11 225 197 170 140 116
0.80 1.25 337 294 255 206 166
0.50 2 680 595 517 410 313
0.20 5 1,260 1,110 964 760 550
0.10 10 1,670 1,500 1,290 1,020 721
0.04 25 2,210 2,010 1,730 1,370 943
0.02 50 2,620 2,410 2,060 1,640 1,110
0.01 100 3,020 2,800 2,400 1,920 1,280
0.005 200 3,410 3,210 2,730 2,200 1,450
0.002 500 3,930 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
1945 March 16 9.52 894 1972 March 25 8.35 1,310
1946 March 19 8.49 452 1973 March 18 4.88 172
1947 April 13 9.42 878 1974 April 13 8.64 1,280
1948 April 13 -- 297 1975 July 1 9.76 2,050
1949 April 7 6.67 256 1976 March 31 6.49 408
1950 April 7 9.32 841 1977 July 4 5.31 121
1951 April 7 9.00 792 1978 April 7 9.44 2,000
1952 April 8 9.10 880 1979 April 17 8.67 980
1953 June 17 7.47 598 1980 April 3 7.42 619
1954 April 12 7.36 630 1981 July 31 4.47 74.0
1955 August 5 9.31 1,590 1982 April 2 7.22 468
1956 April 11 8.50 1,020 1983 July 5 8.96 1,080
1957 March 26 6.61 456 1984 June 10 8.10 846
1958 July 5 4.86 195 1985 May 13 8.58 1,060
1959 July 11 7.04 551 1986 May 13 8.11 866
1960 April 27 7.54 660 1987 March 25 6.06 330
1961 May 16 5.28 246 1988 April 2 6.12 350
1962 June 10 9.11 1,430 1989 April 5 9.11 1,510
1963 August 12 5.48 253 1990 March 31 7.18 562
1964 April 19 8.46 1,000 1991 May 6 -- 248
1965 April 11 8.87 1,250 1992 July 11 5.66 237
1966 March 18 10.42 1,520 1993 July 18 10.40 2,010
1967 March 30 7.57 669 1994 March 23 7.88 540
1968 March 28 4.97 202 1995 March 16 8.86 900
1969 April 9 9.07 1,880 1996 April 13 9.31 1,350
1970 April 10 6.98 498 1997 April 6 10.77 2,360
1971 April 2 6.45 382
Annual peak discharge, from highest to lowest, and corresponding gage height
1997 April 6 10.77 2,360 1964 April 19 8.46 1,000
1975 July 1 9.76 2,050 1979 April 17 8.67 980
1993 July 18 10.40 2,010 1995 March 16 8.86 900
1978 April 7 9.44 2,000 1945 March 16 9.52 894
1969 April 9 9.07 1,880 1952 April 8 9.10 880
1955 August 5 9.31 1,590 1947 April 13 9.42 878
1966 March 18 10.42 1,520 1986 May 13 8.11 866
1989 April 5 9.11 1,510 1984 June 10 8.10 846
1962 June 10 9.11 1,430 1950 April 7 9.32 841
1996 April 13 9.31 1,350 1951 April 7 9.00 792
1972 March 25 8.35 1,310 1967 March 30 7.57 669
1974 April 13 8.64 1,280 1960 April 27 7.54 660
1965 April 11 8.87 1,250 1954 April 12 7.36 630
1983 July 5 8.96 1,080 1980 April 3 7.42 619
1985 May 13 8.58 1,060 1953 June 17 7.47 598
1956 April 11 8.50 1,020 1990 March 31 7.18 562
1959 July 11 7.04 551 1949 April 7 6.67 256
1994 March 23 7.88 540 1963 August 12 5.48 253
1970 April 10 6.98 498 1991 May 6 -- 248
1982 April 2 7.22 468 1961 May 16 5.28 246
1957 March 26 6.61 456 1992 July 11 5.66 237
1946 March 19 8.49 452 1968 March 28 4.97 202
1976 March 31 6.49 408 1958 July 5 4.86 195
1971 April 2 6.45 382 1973 March 18 4.88 172
1988 April 2 6.12 350 1977 July 4 5.31 121
1987 March 25 6.06 330 1981 July 31 4.47 74.0
1948 April 13 -- 297
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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
__________________________________________________________________________________________________________________________________
1945 -- -- -- -- -- -- 281.8 136.9 65.6 20.8 15.9 44.2 --
1946 37.5 25.2 21.6 16.8 12.3 178.0 147.1 81.1 80.8 194.9 39.9 28.4 72.5
1947 73.6 43.9 26.5 22.2 15.9 44.8 462.4 176.6 144.8 50.2 21.8 29.4 92.5
1948 25.0 23.4 21.3 17.4 13.4 34.0 179.5 58.3 51.5 26.1 22.2 14.6 40.4
1949 13.7 17.5 12.8 10.7 9.87 17.7 98.3 71.5 26.1 83.7 37.8 18.2 35.0
1950 21.9 23.0 22.3 13.8 14.8 67.4 447.0 280.5 117.0 34.9 13.6 11.8 89.0
1951 14.9 14.1 14.1 13.1 11.1 18.3 340.6 83.7 81.9 33.6 26.9 26.3 56.3
1952 31.0 29.2 38.0 27.0 27.0 24.9 425.3 73.8 28.5 290.7 168.3 45.6 100.8
1953 27.0 28.3 20.0 15.5 17.5 126.5 180.2 114.6 199.7 72.1 163.6 42.7 84.2
1954 27.0 24.3 25.7 25.9 27.9 60.1 247.2 160.8 69.5 28.5 15.5 20.8 61.1
1955 19.7 19.8 13.3 13.5 13.6 23.1 141.5 53.0 54.1 163.9 472.1 46.6 87.0
1956 33.6 29.2 22.6 17.6 20.2 22.6 468.4 123.5 55.3 22.2 22.3 16.0 70.6
1957 14.8 25.4 13.4 12.4 14.0 102.0 147.2 66.7 146.1 110.6 38.2 182.2 72.7
1958 111.5 83.8 40.8 30.8 22.6 37.1 61.9 40.2 68.9 75.1 32.1 53.2 55.0
1959 36.9 54.4 30.3 15.2 13.6 101.3 111.9 79.2 171.7 248.8 73.8 37.9 81.7
1960 40.9 34.1 27.8 23.7 21.9 43.5 355.9 173.5 82.4 52.3 40.8 30.7 77.1
1961 21.1 22.2 17.0 14.0 16.5 68.7 83.0 123.5 34.5 17.4 10.7 14.3 37.1
1962 16.8 16.0 13.1 9.94 11.3 18.8 189.4 270.1 530.1 173.2 60.6 40.5 112.4
1963 34.3 31.4 23.1 14.1 9.94 47.8 92.5 54.0 91.9 21.5 60.2 60.2 45.1
1964 26.4 20.0 15.4 15.7 17.7 23.9 434.2 209.5 72.7 31.1 16.9 25.3 75.4
1965 27.5 23.4 13.9 16.2 16.1 17.6 564.5 151.9 133.9 47.0 26.7 36.1 89.1
1966 45.4 28.8 24.4 22.5 19.3 434.3 373.3 222.2 74.2 43.0 74.4 32.0 116.8
1967 38.5 36.2 29.9 30.6 29.1 106.7 356.5 162.6 137.5 61.0 20.1 16.0 85.3
1968 17.3 18.4 18.6 13.6 12.2 53.7 86.5 83.5 59.2 39.7 19.5 23.1 37.1
1969 31.2 25.9 19.6 16.5 15.0 15.0 561.0 119.2 42.9 51.6 16.4 14.0 76.9
1970 29.3 28.2 18.6 13.1 15.4 19.6 222.1 159.5 112.0 38.6 10.8 10.1 56.4
1971 18.2 25.2 13.0 12.3 13.9 58.6 145.7 51.1 33.5 32.7 18.4 85.0 42.2
1972 109.6 176.4 63.8 30.6 29.2 316.4 373.1 213.5 89.6 37.7 32.8 24.5 124.8
1973 17.8 20.6 15.5 12.6 14.1 73.0 50.1 37.8 28.3 21.4 20.8 122.7 36.2
1974 150.6 58.8 35.4 29.2 27.5 32.2 451.3 294.7 143.5 56.2 36.9 23.1 111.7
1975 23.8 32.2 23.3 17.6 17.9 27.1 444.7 222.6 346.8 625.3 61.2 30.7 156.6
1976 33.6 35.2 22.8 20.3 26.3 95.5 121.9 41.7 18.6 10.1 5.87 8.52 36.7
1977 12.7 12.2 10.6 11.0 12.0 38.2 34.6 21.5 12.7 10.2 6.03 18.7 16.7
1978 31.8 39.7 42.5 33.2 24.9 47.7 792.2 118.4 43.7 31.6 14.1 11.9 102.0
1979 11.6 14.1 13.3 13.9 14.0 18.6 393.9 176.2 73.1 110.5 35.5 13.4 74.0
1980 15.4 30.4 18.6 18.2 20.9 31.9 197.0 36.8 23.3 13.1 12.7 19.5 36.2
1981 -- 24.5 27.2 54.7 99.6 33.1 33.3 24.6 -- -- -- -- --
1982 -- -- -- -- -- 78.0 236.3 79.3 41.7 75.8 22.5 -- --
1983 -- -- -- -- -- 89.9 70.3 50.7 60.2 481.4 69.0 49.1 --
1984 60.5 55.2 -- -- -- 208.0 238.3 77.0 284.6 34.4 12.8 10.9 --
1985 45.8 -- -- -- -- 170.6 78.1 371.5 279.6 91.7 55.2 72.0 --
1986 85.7 62.0 46.9 38.4 36.2 187.0 389.2 340.6 92.9 52.5 34.0 80.9 120.8
1987 75.9 61.9 46.5 38.4 35.7 180.3 103.7 79.8 40.3 25.7 24.3 19.6 61.3
1988 19.9 19.9 21.5 19.3 22.6 140.0 120.2 40.1 17.2 10.4 16.0 16.2 38.7
1989 15.4 16.2 17.8 19.2 19.6 37.9 506.9 82.1 36.4 13.6 12.5 58.0 69.1
1990 23.4 24.4 16.6 15.9 20.4 91.7 118.1 64.2 50.4 20.4 10.2 9.82 38.8
1991 15.5 37.3 13.6 12.4 13.9 50.6 61.9 136.7 66.5 65.1 16.5 16.5 42.4
1992 22.7 21.4 20.3 18.8 23.7 63.3 49.0 44.2 57.9 115.8 25.9 35.1 41.6
1993 25.5 26.4 16.5 12.4 19.2 98.7 208.8 73.6 145.3 784.0 451.8 134.7 168.0
1994 -- -- -- -- -- -- -- -- -- -- -- -- --
1995 115.7 101.1 47.8 35.5 36.0 318.3 230.2 152.5 53.7 136.6 36.0 22.5 107.8
1996 76.2 70.1 42.7 35.4 34.0 70.3 451.5 323.5 120.4 39.7 28.4 25.1 109.6
1997 34.3 60.8 38.8 33.8 31.8 26.3 1,036 272.1 182.3 236.5 80.8 72.8 174.9
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