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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 36.3 29.3 0.81 4.14
November 176 1972 12.2 1977 33.8 26.4 0.78 3.86
December 63.8 1972 10.6 1977 23.4 11.2 0.48 2.67
January 54.7 1981 9.94 1962 19.8 9.16 0.46 2.26
February 99.6 1981 9.87 1949 20.7 13.8 0.67 2.36
March 434 1966 15.0 1969 80.7 81.2 1.01 9.22
April 792 1978 33.3 1981 251 176 0.70 28.6
May 372 1985 21.5 1977 123 85.2 0.69 14.0
June 530 1962 12.7 1977 98.3 95.5 0.97 11.2
July 784 1993 10.1 1976 99.0 154 1.56 11.3
August 472 1955 5.87 1976 52.4 92.4 1.76 5.99
September 182 1957 8.52 1976 37.9 34.8 0.92 4.33
Annual 168 1993 16.7 1977 72.7 34.0 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 11.1 11.1 14.2 34.3 29.7 18.5 11.1 8.11 9.06 12.3 14.6 12.4 11.9
90 12.2 12.3 15.8 45.7 36.7 23.2 14.9 9.95 11.2 13.9 16.4 13.3 13.5
85 12.8 12.9 17.3 53.7 41.8 27.7 17.8 11.5 12.7 15.7 17.9 13.9 15.1
80 13.3 13.6 18.8 61.7 46.5 31.7 20.3 13.8 14.3 17.1 19.4 14.7 16.8
75 13.8 14.2 20.5 72.2 51.7 36.0 22.7 15.7 15.7 18.5 21.0 15.5 18.5
70 14.4 14.6 22.0 85.8 57.8 40.6 25.4 17.4 17.1 20.4 22.4 16.6 20.3
65 14.9 15.1 23.5 100 64.8 45.5 28.2 18.9 18.9 22.2 23.3 18.1 22.0
60 15.9 15.9 25.7 118 72.1 50.7 32.0 20.4 20.9 23.7 24.3 18.9 24.1
55 16.6 16.8 28.3 138 80.3 56.2 36.0 22.2 22.7 25.0 25.2 19.9 26.2
50 17.5 17.8 31.3 166 88.7 62.6 40.3 23.9 25.7 26.5 26.1 20.9 29.0
45 18.5 18.8 34.7 196 97.0 69.0 45.3 26.5 29.0 28.2 27.0 21.7 32.2
40 19.3 19.8 39.9 225 109 75.5 51.2 29.2 31.4 30.1 29.0 22.8 36.6
35 20.1 20.8 50.2 254 123 83.4 58.4 32.3 34.1 32.2 30.6 24.1 42.3
30 21.6 22.1 62.1 286 140 93.4 69.1 35.8 37.5 35.1 32.4 25.4 51.3
25 23.8 23.8 78.0 329 160 106 86.6 42.4 41.8 38.6 35.5 27.2 64.2
20 27.1 26.2 99.1 381 182 124 108 49.6 48.6 45.5 39.3 30.0 83.9
15 29.4 27.9 129 454 211 152 137 64.5 58.8 56.3 47.9 36.7 114
10 32.3 29.9 192 580 248 196 192 91.2 81.0 76.1 58.8 39.8 167
5 38.5 36.7 306 779 314 272 365 189 125 105 77.4 46.4 276
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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 76.6 67.5 57.0 49.3 44.4
0.95 1.05 154 133 114 95.2 81.6
0.90 1.11 218 187 161 133 111
0.80 1.25 326 278 241 195 158
0.50 2 661 562 489 388 297
0.20 5 1,240 1,060 923 723 525
0.10 10 1,680 1,440 1,250 977 690
0.04 25 2,270 1,950 1,690 1,320 907
0.02 50 2,720 2,350 2,040 1,590 1,070
0.01 100 3,180 2,770 2,390 1,870 1,240
0.005 200 3,640 3,190 2,740 2,160 1,410
0.002 500 4,310 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 5.26 5.62 6.28 6.83 7.46 8.59 9.75 11.1 12.2
0.10 10 6.43 6.78 7.35 7.87 8.52 9.67 10.9 12.3 13.6
0.20 5 8.10 8.43 8.87 9.35 10.0 11.2 12.6 14.0 15.6
0.50 2 12.1 12.4 12.7 13.1 13.9 15.2 16.8 18.5 21.3
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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 9.10 9.23 9.31 9.64 11.0 11.9 13.3 16.2
0.10 10 9.95 10.1 10.2 10.6 12.3 13.3 14.8 19.3
0.20 5 11.2 11.4 11.6 12.0 14.2 15.4 17.1 24.3
0.50 2 14.6 14.9 15.2 15.7 18.9 21.1 23.4 40.2
June-July-August September-October-November
_________________________ ___________________________
0.05 20 5.51 6.53 7.08 8.12 6.55 7.59 8.37 10.1
0.10 10 6.98 8.03 8.68 10.0 7.96 9.13 9.97 11.6
0.20 5 9.27 10.4 11.2 13.1 10.1 11.5 12.4 14.1
0.50 2 15.8 17.2 18.9 22.4 15.6 18.0 19.2 21.2
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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
1945 March 16 9.52 894 1970 April 10 6.98 498
1946 March 19 8.49 452 1971 April 2 6.45 382
1947 April 13 9.42 878 1972 March 25 8.35 1,310
1948 April 13 -- 297 1973 March 18 4.88 172
1949 April 7 6.67 256 1974 April 13 8.64 1,280
1950 April 7 9.32 841 1975 July 1 9.76 2,050
1951 April 7 9.00 792 1976 March 31 6.49 408
1952 April 8 9.10 880 1977 July 4 5.31 121
1953 June 17 7.47 598 1978 April 7 9.44 2,000
1954 April 12 7.36 630 1979 April 17 8.67 980
1955 August 5 9.31 1,590 1980 April 3 7.42 619
1956 April 11 8.50 1,020 1981 July 31 4.47 74.0
1957 March 26 6.61 456 1982 April 2 7.22 468
1958 July 5 4.86 195 1983 July 5 8.96 1,080
1959 July 11 7.04 551 1984 June 10 8.10 846
1960 April 27 7.54 660 1985 May 13 8.58 1,060
1961 May 16 5.28 246 1986 May 13 8.11 866
1962 June 10 9.11 1,430 1987 March 25 6.06 330
1963 August 12 5.48 253 1988 April 2 6.12 350
1964 April 19 8.46 1,000 1989 April 5 9.11 1,510
1965 April 11 8.87 1,250 1990 March 31 7.18 562
1966 March 18 10.42 1,520 1991 May 6 -- 248
1967 March 30 7.57 669 1992 July 11 5.66 237
1968 March 28 4.97 202 1993 July 18 10.40 2,010
1969 April 9 9.07 1,880 1994 March 23 7.88 540
Annual peak discharge, from highest to lowest, and corresponding gage height
1975 July 1 9.76 2,050 1947 April 13 9.42 878
1993 July 18 10.40 2,010 1986 May 13 8.11 866
1978 April 7 9.44 2,000 1984 June 10 8.10 846
1969 April 9 9.07 1,880 1950 April 7 9.32 841
1955 August 5 9.31 1,590 1951 April 7 9.00 792
1966 March 18 10.42 1,520 1967 March 30 7.57 669
1989 April 5 9.11 1,510 1960 April 27 7.54 660
1962 June 10 9.11 1,430 1954 April 12 7.36 630
1972 March 25 8.35 1,310 1980 April 3 7.42 619
1974 April 13 8.64 1,280 1953 June 17 7.47 598
1965 April 11 8.87 1,250 1990 March 31 7.18 562
1983 July 5 8.96 1,080 1959 July 11 7.04 551
1985 May 13 8.58 1,060 1994 March 23 7.88 540
1956 April 11 8.50 1,020 1970 April 10 6.98 498
1964 April 19 8.46 1,000 1982 April 2 7.22 468
1979 April 17 8.67 980 1957 March 26 6.61 456
1945 March 16 9.52 894 1946 March 19 8.49 452
1952 April 8 9.10 880 1976 March 31 6.49 408
1971 April 2 6.45 382 1961 May 16 5.28 246
1988 April 2 6.12 350 1992 July 11 5.66 237
1987 March 25 6.06 330 1968 March 28 4.97 202
1948 April 13 -- 297 1958 July 5 4.86 195
1949 April 7 6.67 256 1973 March 18 4.88 172
1963 August 12 5.48 253 1977 July 4 5.31 121
1991 May 6 -- 248 1981 July 31 4.47 74.0
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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; --, 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 -- -- -- -- -- -- -- -- -- -- -- -- --
__________________________________________________________________________________________________________________________________
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