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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 153 1982 1.92 1956 40.9 42.7 1.04 2.62
November 156 1980 5.27 1956 58.7 51.1 0.87 3.76
December 191 1987 4.32 1980 56.5 43.7 0.77 3.62
January 140 1986 3.64 1956 53.9 36.3 0.67 3.45
February 200 1969 7.66 1956 61.1 52.1 0.85 3.91
March 1,240 1983 7.81 1955 173 269 1.55 11.1
April 1,940 1969 2.07 1953 475 512 1.08 30.4
May 2,910 1950 6.86 1959 251 477 1.90 16.1
June 1,150 1950 5.88 1958 148 191 1.29 9.46
July 1,270 1993 7.28 1959 115 203 1.77 7.36
August 1,560 1993 6.72 1977 74.2 231 3.11 4.76
September 577 1994 0.807 1955 53.3 103 1.93 3.42
Annual 521 1950 12.8 1991 130 111 0.86 100
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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 7.66 8.48 6.53 2.00 7.49 7.73 7.27 2.40 2.10 2.30 8.62 7.91 6.53
90 9.68 9.06 9.64 8.05 9.06 10.2 9.72 7.63 7.47 7.45 10.6 9.87 8.92
85 13.5 11.5 13.0 9.81 11.7 12.2 11.3 9.17 9.53 8.99 13.2 15.5 11.2
80 18.1 14.5 16.7 11.7 13.2 13.5 13.4 10.3 10.7 10.5 15.1 18.9 13.1
75 23.8 20.0 20.9 13.9 14.6 15.4 14.9 12.4 12.5 11.5 17.1 24.4 15.0
70 26.7 24.0 26.4 26.4 19.7 18.7 16.4 13.9 14.1 12.5 19.8 29.9 17.5
65 31.2 27.1 35.3 45.8 33.3 26.0 18.7 15.3 15.4 14.1 23.3 37.3 20.8
60 42.3 35.9 50.8 68.7 45.7 33.0 21.5 16.9 16.5 15.2 28.0 41.2 24.9
55 46.5 45.6 56.9 103 60.8 41.1 24.8 18.6 17.6 16.3 33.6 44.8 31.0
50 50.1 50.3 63.8 146 81.2 53.4 28.9 20.3 18.7 17.9 40.0 47.1 38.7
45 53.6 54.1 72.4 230 114 67.4 35.2 22.1 19.8 19.9 44.9 49.3 47.3
40 56.9 57.6 84.2 290 145 82.2 45.2 24.9 22.9 21.9 49.2 51.6 55.6
35 60.2 61.4 102 357 172 100 60.3 27.8 26.3 28.0 53.1 54.8 63.9
30 65.5 67.9 130 446 197 129 77.5 31.6 32.1 35.4 58.9 60.0 79.4
25 72.0 78.6 173 581 273 172 96.9 38.5 39.6 42.7 80.7 68.6 100
20 80.3 91.5 208 827 317 218 138 49.1 50.3 60.4 96.7 85.7 130
15 97.2 104 251 1,110 389 286 203 69.4 66.9 79.7 110 109 181
10 115 130 323 1,440 496 355 283 120 94.5 115 130 125 266
5 136 208 827 1,940 966 518 465 248 240 168 177 152 511
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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 29.1 15.3 14.6 14.4 14.3
0.95 1.05 100 64.1 57.6 50.1 42.8
0.90 1.11 181 126 111 92.4 74.2
0.80 1.25 350 265 230 184 139
0.50 2 1,030 875 766 597 422
0.20 5 2,450 2,190 2,010 1,610 1,130
0.10 10 3,560 3,210 3,050 2,520 1,790
0.04 25 5,020 4,500 4,470 3,880 2,840
0.02 50 6,080 5,400 5,540 4,990 3,760
0.01 100 7,100 6,240 6,600 6,160 4,770
0.005 200 8,070 7,000 7,620 7,380 5,880
0.002 500 9,260 ng ng ng ng
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Probability of annual low discharges
____________________________________________________________________________________
Minimum average discharge (ft3/s)
________________________________________________________________
Number of consecutive days
________________________________________________________________
Non- Recur-
exceed- rence
ance inter- 1 3 7 14 30 60 90 120 183
prob- val
ability (years)
____________________________________________________________________________________
0.05 20 0 0.006 0.015 0.258 2.08 3.92 4.68 6.15 7.62
0.10 10 0.090 0.201 0.430 0.870 3.10 5.02 6.15 7.91 10.5
0.20 5 0.580 0.938 1.71 2.48 4.48 6.84 8.63 10.8 15.4
0.50 2 4.01 5.73 7.95 8.97 10.2 12.9 16.9 20.5 30.6
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Probability of seasonal low discharges
_________________________________________________________________________________________
Minimum average discharge (ft3/s)
_____________________________________________________________
Number of consecutive days
_____________________________________________________________
Non- Recurrence
exceedance interval 1 7 14 30 1 7 14 30
probability (years)
_________________________________________________________________________________________
December-January-February March-April-May
_________________________ ___________________________
0.05 20 2.88 4.67 5.46 6.14 1.43 1.56 2.03 3.05
0.10 10 5.06 7.13 8.11 9.38 2.60 3.00 3.72 5.85
0.20 5 9.34 11.5 12.7 15.1 5.10 6.23 7.45 12.3
0.50 2 24.7 26.2 27.9 33.2 16.1 21.2 25.1 43.7
June-July-August September-October-November
_________________________ ___________________________
0.05 20 0.204 1.53 12.78 4.03 0.077 0.443 1.26 3.23
0.10 10 1.46 3.26 14.43 5.60 0.330 1.21 2.41 4.84
0.20 5 3.63 5.18 5.22 8.37 1.23 3.32 4.81 7.69
0.50 2 10.8 11.0 16.6 18.3 7.34 13.1 13.9 17.3
_________________________________________________________________________________________
1Graphical interpretation.
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Annual peak discharge and corresponding gage height, period of record
[--, no data]
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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
1948 April 27 -- 4,600 1972 April 26 27.82 991
1950 May 23 32.62 3,150 1973 March 29 26.50 90.0
1951 April 19 28.00 1,270 1974 April 21 30.02 1,940
1952 August 29 -- 400 1975 April 29 29.20 1,640
1953 July 16 29.40 1,980 1976 April 10 27.99 982
1954 March 11 28.28 1,270 1977 October 1 26.16 37.0
1955 April 13 28.86 1,640 1978 April 7 28.55 1,370
1956 April 26 30.25 2,070 1979 April 24 36.26 4,740
1957 September 4 27.50 598 1980 April 3 27.38 516
1958 July 17 -- 240 1981 April 3 27.37 493
1959 November 18 26.83 190 1982 April 12 30.01 1,930
1960 April 17 29.24 1,570 1983 March 9 29.91 1,910
1961 November 27 27.88 697 1984 April 3 29.50 1,790
1962 April 10 27.67 778 1985 May 16 27.73 680
1963 November 15 26.30 56.0 1986 April 19 30.22 2,050
1964 June 28 27.51 679 1987 April 14 30.51 2,200
1965 April 14 32.69 2,980 1988 January 19 26.84 146
1966 March 28 32.72 3,250 1989 April 4 27.60 642
1967 April 9 29.00 1,560 1990 September 13 26.75 123
1968 June 11 27.92 974 1991 July 25 26.60 82.0
1969 April 19 35.47 4,580 1992 March 7 28.57 1,260
1970 April 19 28.23 1,230 1993 July 28 34.98 3,720
1971 April 20 29.75 1,830 1994 April 2 29.28 1,630
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 24 36.26 4,740 1954 March 11 28.28 1,270
1948 April 27 -- 4,600 1992 March 7 28.57 1,260
1969 April 19 35.47 4,580 1970 April 19 28.23 1,230
1993 July 28 34.98 3,720 1972 April 26 27.82 991
1966 March 28 32.72 3,250 1976 April 10 27.99 982
1950 May 23 32.62 3,150 1968 June 11 27.92 974
1965 April 14 32.69 2,980 1962 April 10 27.67 778
1987 April 14 30.51 2,200 1961 November 27 27.88 697
1956 April 26 30.25 2,070 1985 May 16 27.73 680
1986 April 19 30.22 2,050 1964 June 28 27.51 679
1953 July 16 29.40 1,980 1989 April 4 27.60 642
1974 April 21 30.02 1,940 1957 September 4 27.50 598
1982 April 12 30.01 1,930 1980 April 3 27.38 516
1983 March 9 29.91 1,910 1981 April 3 27.37 493
1971 April 20 29.75 1,830 1952 August 29 -- 400
1984 April 3 29.50 1,790 1958 July 17 -- 240
1955 April 13 28.86 1,640 1958 November 18 26.83 190
1975 April 29 29.20 1,640 1988 January 19 26.84 146
1994 April 2 29.28 1,630 1990 September 13 26.75 123
1960 April 17 29.24 1,570 1973 March 29 26.50 90.0
1967 April 9 29.00 1,560 1991 July 25 26.60 82.0
1978 April 7 28.55 1,370 1963 November 15 26.30 56.0
1951 April 19 28.00 1,270 1976 October 1 26.16 37.0
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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]
__________________________________________________________________________________________________________________________________
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
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