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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 392 1995 0.829 1964 34.3 56.6 1.65 2.34
November 255 1995 2.83 1977 30.8 36.3 1.18 2.09
December 119 1995 3.14 1977 19.1 18.2 0.95 1.30
January 68.2 1995 1.94 1964 12.6 11.0 0.87 0.85
February 74.7 1981 0 1963 13.1 14.6 1.12 0.89
March 1,380 1995 2.14 1964 186 284 1.53 12.7
April 2,620 1996 42.4 1991 636 636 1.00 43.2
May 1,950 1950 37.3 1961 240 337 1.40 16.3
June 435 1974 6.66 1961 120 93.4 0.78 8.15
July 640 1993 3.84 1961 90.9 106 1.16 6.19
August 1,030 1993 0.681 1961 55.0 144 2.62 3.74
September 321 1994 0 1959 32.4 55.7 1.72 2.21
Annual 399 1950 13.2 1977 122 96.0 0.78 100
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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 2.40 1.10 2.30 40.8 37.1 15.4 6.06 0.55 0.28 0.66 4.30 3.80 2.16
90 3.20 2.30 4.37 60.3 43.5 23.7 11.5 1.60 0.75 1.50 7.20 5.36 3.82
85 4.40 3.40 6.21 73.3 49.8 30.7 15.1 3.56 1.40 3.31 9.79 6.39 5.92
80 5.10 3.40 7.16 85.7 55.2 35.3 18.3 5.30 2.00 4.42 11.5 7.66 7.78
75 6.56 5.23 8.31 100 60.6 40.7 21.6 6.88 3.09 5.82 13.0 8.13 9.26
70 7.16 5.95 9.74 118 66.2 46.8 25.0 8.26 4.16 7.71 14.6 9.59 11.8
65 7.53 6.61 11.3 144 73.1 53.6 29.3 10.6 5.92 10.5 16.3 10.5 14.3
60 7.90 7.33 13.8 183 80.6 61.8 33.8 12.6 7.33 13.7 17.6 12.1 17.5
55 8.47 7.68 17.7 233 89.3 70.8 39.4 14.7 10.2 16.3 19.0 13.4 21.1
50 8.85 8.03 24.0 285 101 79.9 45.3 17.3 14.0 18.9 20.8 14.7 25.9
45 9.68 9.07 33.2 343 118 89.6 51.9 20.1 17.1 21.4 22.6 16.1 32.1
40 11.0 9.76 45.9 417 142 100 58.9 24.2 20.4 25.3 25.1 17.6 40.3
35 12.2 10.4 66.2 520 169 114 69.8 29.0 25.0 30.0 28.4 19.1 49.3
30 13.5 11.6 105 640 204 131 84.2 35.8 30.4 35.6 32.8 21.3 62.8
25 14.9 13.5 157 771 244 150 106 43.9 37.2 42.6 38.8 23.7 78.8
20 17.7 15.7 216 929 300 176 134 58.6 44.4 50.8 46.3 26.5 107
15 20.9 18.1 344 1,200 391 212 167 76.5 51.7 61.4 52.4 29.8 159
10 26.2 25.0 571 1,690 496 267 217 102 66.3 74.7 58.0 37.7 254
5 32.5 36.6 1,000 2,570 930 361 304 167 113 101 75.2 48.4 540
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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 66.8 52.8 47.3 43.7 39.0
0.95 1.05 170 144 130 114 92.9
0.90 1.11 271 238 215 184 144
0.80 1.25 465 418 378 317 238
0.50 2 1,200 1,110 998 813 581
0.20 5 2,810 2,570 2,290 1,840 1,290
0.10 10 4,200 3,780 3,350 2,700 1,900
0.04 25 6,280 5,520 4,840 3,920 2,780
0.02 50 8,010 6,900 6,010 4,910 3,510
0.01 100 9,880 8,340 7,220 5,930 4,290
0.005 200 11,900 9,810 8,440 6,980 5,120
0.002 500 14,700 ng ng ng ng
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Annual peak discharge and corresponding gage height, period of record
_____________________________________________________________________________________
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 20 10.50 1,000 1972 March 27 12.26 1,120
1946 April 2 10.68 964 1973 March 15 7.52 260
1947 April 8 13.89 1,150 1974 April 15 16.40 2,460
1948 April 23 18.10 5,600 1975 April 25 15.35 1,490
1949 April 17 15.95 2,290 1976 April 2 13.45 1,450
1950 April 17 18.69 7,830 1977 April 5 5.49 136
1951 April 19 11.05 989 1978 April 12 14.13 1,460
1952 April 14 13.02 1,240 1979 April 20 17.87 4,680
1953 July 3 6.22 271 1980 April 9 10.57 750
1954 June 26 9.32 682 1981 March 23 8.61 500
1955 April 11 11.41 1,060 1982 April 12 15.83 1,900
1956 April 24 16.32 2,600 1983 April 12 16.24 1,610
1957 September 4 6.68 280 1984 April 3 15.13 1,850
1958 April 7 7.04 340 1985 March 23 11.74 930
1959 April 1 7.95 360 1986 March 23 15.56 1,760
1960 April 14 13.38 1,340 1987 April 5 18.21 4,840
1961 April 3 5.13 120 1988 April 5 10.96 389
1962 April 11 12.69 900 1989 April 16 11.95 796
1963 April 6 7.25 300 1990 June 30 10.30 159
1964 June 23 10.34 795 1991 May 6 7.09 84.0
1965 April 15 16.03 2,320 1992 March 16 13.72 1,100
1966 March 23 17.62 3,040 1993 July 25 18.33 2,780
1967 March 31 15.75 2,160 1994 April 1 15.31 1,750
1968 March 29 8.31 415 1995 March 26 17.78 3,380
1969 April 17 18.07 5,050 1996 April 18 19.13 6,760
1970 April 8 12.80 1,220 1997 April 24 18.52 5,280
1971 April 17 16.31 2,310
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 April 17 18.69 7,830 1984 April 3 15.13 1,850
1996 April 18 19.13 6,760 1986 March 23 15.56 1,760
1948 April 23 18.10 5,600 1994 April 1 15.31 1,750
1997 April 24 18.52 5,280 1983 April 12 16.24 1,610
1969 April 17 18.07 5,050 1975 April 25 15.35 1,490
1987 April 5 18.21 4,840 1978 April 12 14.13 1,460
1979 April 20 17.87 4,680 1976 April 2 13.45 1,450
1995 March 26 17.78 3,380 1960 April 14 13.38 1,340
1966 March 23 17.62 3,040 1952 April 14 13.02 1,240
1993 July 25 18.33 2,780 1947 April 8 13.89 1,150
1956 April 24 16.32 2,600 1970 April 8 12.80 1,220
1974 April 15 16.40 2,460 1972 March 27 12.26 1,120
1965 April 15 16.03 2,320 1992 March 16 13.72 1,100
1971 April 17 16.31 2,310 1955 April 11 11.41 1,060
1949 April 17 15.95 2,290 1945 March 20 10.50 1,000
1967 March 31 15.75 2,160 1951 April 19 11.05 989
1982 April 12 15.83 1,900 1946 April 2 10.68 964
1970 April 8 11.25 964 1959 April 1 7.95 360
1985 March 23 11.74 930 1958 April 7 7.04 340
1962 April 11 12.69 900 1963 April 6 7.25 300
1989 April 16 11.95 796 1957 September 4 6.68 280
1964 June 23 10.34 795 1953 July 3 6.22 271
1980 April 9 10.57 750 1973 March 15 7.52 260
1954 June 26 9.32 682 1990 June 30 10.30 159
1981 March 23 8.61 500 1977 April 5 5.49 136
1968 March 29 8.31 415 1961 April 3 5.13 120
1988 April 5 10.96 389 1991 May 6 7.09 84.0
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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
__________________________________________________________________________________________________________________________________
1945 20.0 50.0 25.0 8.00 10.0 403.8 128.2 78.2 65.6 19.8 8.57 10.2 69.5
1946 9.35 12.8 8.46 9.44 3.71 370.5 297.4 52.9 24.1 61.9 34.0 13.0 75.2
1947 23.3 18.2 9.61 7.74 4.46 151.7 415.5 66.7 64.4 29.3 14.5 5.38 67.4
1948 18.7 15.6 12.1 10.6 5.41 6.77 1,780 618.6 69.3 46.8 26.6 2.76 216.2
1949 6.26 15.6 11.4 5.61 4.64 22.2 1,142 140.4 74.1 55.7 24.6 2.85 124.5
1950 23.8 23.7 16.8 12.9 8.61 53.7 2,293 1,953 272.6 80.4 24.6 25.4 399.4
1951 29.0 23.9 23.2 20.8 17.9 83.6 650.4 173.4 91.4 35.0 11.2 31.8 98.9
1952 18.1 16.4 15.7 11.6 10.6 44.3 446.6 80.0 32.0 85.6 12.1 6.26 64.6
1953 3.64 11.3 7.47 6.23 7.71 18.3 62.8 73.3 123.2 132.4 8.74 2.38 38.2
1954 4.19 9.25 8.77 7.68 48.2 121.9 116.6 51.3 313.0 213.1 65.5 47.3 83.8
1955 46.0 34.5 17.8 8.58 7.84 27.6 438.8 96.5 171.4 45.9 6.45 0.860 74.8
1956 3.49 6.60 5.53 4.66 4.00 4.81 677.9 243.0 280.3 51.3 12.9 18.3 108.5
1957 13.2 37.8 15.0 9.87 7.43 75.4 108.8 75.1 45.3 47.3 36.7 155.2 52.3
1958 86.7 61.8 31.5 17.8 15.8 48.1 126.6 45.9 38.0 107.6 12.8 2.35 49.8
1959 3.48 9.91 6.41 3.30 1.48 36.9 129.5 42.1 24.3 10.4 0.855 0 22.4
1960 8.50 8.35 6.57 5.08 3.74 52.8 616.1 101.4 121.4 31.8 8.20 4.24 79.9
1961 2.85 8.96 5.89 3.63 0.607 51.3 79.0 37.3 6.66 3.84 0.681 0.703 16.8
1962 3.77 3.35 4.70 4.09 2.36 24.7 360.5 108.2 189.2 49.1 26.4 11.9 65.4
1963 9.02 19.5 11.5 4.00 0 32.8 94.6 39.0 30.0 28.1 2.67 2.67 22.8
1964 0.829 3.64 3.43 1.94 1.22 2.14 161.8 62.4 236.7 101.3 27.7 40.9 53.3
1965 43.9 25.3 10.7 9.12 7.49 10.0 925.5 146.5 99.6 91.1 153.4 55.0 130.9
1966 95.8 41.8 21.9 14.0 7.65 1,022 385.3 236.2 154.5 188.4 107.9 27.8 193.9
1967 28.4 18.1 16.6 11.2 11.8 236.9 891.1 313.6 95.3 39.0 8.02 5.21 139.4
1968 13.0 14.7 9.82 8.75 7.53 169.2 125.9 78.9 81.3 23.9 14.6 24.6 47.8
1969 15.5 17.7 14.7 8.77 8.43 7.84 1,867 263.7 97.6 88.2 38.9 32.2 203.4
1970 27.4 26.7 22.5 15.6 11.7 32.3 520.7 265.4 184.7 39.0 39.3 19.2 100.1
1971 16.3 22.7 15.0 9.53 8.86 43.8 992.3 170.0 219.2 159.2 25.9 32.5 142.1
1972 51.5 52.4 23.9 10.1 7.06 462.0 478.5 266.6 130.7 21.4 15.5 7.79 127.5
1973 14.6 21.2 17.6 11.8 8.80 142.8 73.5 48.1 31.1 6.37 1.85 17.3 33.1
1974 42.1 17.8 13.3 7.75 5.84 10.3 1,111 659.9 435.2 41.9 16.7 5.29 196.7
1975 14.8 35.0 15.5 12.3 14.0 104.4 715.0 670.0 168.3 95.3 17.9 11.0 156.5
1976 21.6 21.3 15.7 11.7 12.1 196.3 596.4 115.9 39.0 16.7 3.05 0.869 87.1
1977 1.38 2.83 3.14 3.10 3.47 21.9 59.2 39.1 11.2 9.30 0.778 3.32 13.2
1978 11.3 12.2 9.15 8.52 5.03 91.3 707.9 93.8 50.6 21.5 21.5 30.8 88.1
1979 4.58 9.15 8.18 6.81 6.50 6.06 1,322 949.1 127.5 187.0 69.2 21.5 226.7
1980 11.7 23.7 15.5 11.2 10.5 43.3 283.5 57.4 53.4 15.1 8.06 50.6 48.3
1981 48.1 61.1 23.8 15.5 74.7 303.5 127.8 73.7 149.4 87.3 29.7 26.1 85.1
1982 40.6 32.6 21.1 8.84 4.61 104.5 875.5 214.5 165.9 195.4 61.5 17.0 144.9
1983 114.2 65.0 61.0 28.9 26.9 1,094 542.2 176.5 161.5 120.9 115.0 97.5 218.5
1984 49.3 46.4 37.1 25.5 16.6 354.5 770.9 328.3 115.0 40.9 8.95 0.966 149.3
1985 17.2 18.5 12.1 5.05 5.51 299.5 128.7 105.1 80.2 18.3 17.4 56.9 64.1
1986 54.2 71.0 24.1 20.2 10.7 500.9 421.1 298.7 49.0 71.6 42.1 24.3 133.2
1987 39.7 29.2 30.2 22.9 28.0 247.9 1,603 141.4 93.9 229.4 213.6 53.2 227.0
1988 52.3 52.8 43.0 16.5 17.6 154.6 183.0 72.3 29.3 24.3 8.41 1.82 54.7
1989 3.57 12.7 7.26 2.63 7.59 11.2 305.4 68.2 37.8 8.06 1.87 7.11 39.2
1990 4.38 11.1 4.05 6.16 5.79 7.83 69.5 38.4 76.8 40.7 13.5 6.44 23.7
1991 2.56 11.5 6.92 3.21 8.66 22.5 42.4 61.8 30.0 45.4 10.4 15.0 21.8
1992 25.5 22.9 16.9 12.9 19.6 516.9 96.5 64.0 39.1 80.8 15.3 8.56 77.3
1993 8.95 19.4 11.9 8.86 9.36 43.3 397.5 125.6 73.6 640.2 1,033 220.4 218.1
1994 79.2 50.1 41.2 31.4 31.2 426.1 686.1 179.3 318.7 314.8 108.1 321.0 215.7
1995 391.6 254.7 118.9 68.2 64.4 1,381 1,244 533.5 222.8 205.3 118.1 51.3 389.8
1996 69.7 70.7 32.9 34.0 33.0 116.3 2,623 578.6 252.6 203.5 107.8 35.6 343.9
1997 69.8 46.3 37.5 31.3 26.4 41.1 2,390 1,153 202.2 213.2 101.6 47.1 362.7
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