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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 114 1983 0.829 1964 25.8 26.0 1.01 1.99
November 71.0 1986 2.83 1977 25.2 17.5 0.70 1.94
December 61.0 1983 3.14 1977 16.4 11.4 0.69 1.27
January 31.4 1994 1.94 1964 10.6 6.66 0.63 0.82
February 48.2 1954 0 1963 11.4 12.6 1.10 0.88
March 1,090 1983 2.14 1964 166 235 1.41 12.9
April 2,290 1950 42.4 1991 549 521 0.95 42.4
May 1,950 1950 37.3 1961 209 313 1.50 16.2
June 435 1974 6.66 1961 113 92.2 0.81 8.76
July 640 1993 3.84 1961 84.0 105 1.25 6.49
August 1,030 1993 0.681 1961 51.7 148 2.85 4.00
September 321 1994 0 1959 31.7 57.3 1.81 2.45
Annual 399 1950 13.2 1977 108 77.0 0.71 100
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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 2.00 1.10 2.20 39.6 36.7 14.8 5.27 0.38 0.28 0.79 4.30 3.10 2.00
90 3.10 2.30 4.00 58.8 42.7 22.9 10.9 1.60 0.54 1.20 7.14 5.43 3.58
85 3.50 3.40 5.76 71.2 48.9 29.9 14.6 3.33 1.00 2.50 8.65 6.39 5.66
80 4.70 3.40 6.71 82.8 54.0 34.2 17.6 4.94 2.00 4.15 11.2 7.26 7.38
75 5.40 5.03 7.67 96.4 59.1 39.0 20.7 6.43 2.83 5.41 12.5 7.85 8.77
70 6.20 6.08 8.83 112 64.3 44.6 23.9 7.86 3.70 6.70 14.2 9.16 10.8
65 7.29 6.47 10.7 130 70.1 50.9 27.6 8.96 4.87 9.26 15.6 10.6 13.2
60 7.76 6.85 12.9 162 77.1 57.7 31.6 11.7 6.69 12.7 16.7 11.7 15.9
55 8.23 7.50 15.8 205 84.8 66.2 36.5 13.6 8.49 15.4 18.3 12.8 19.2
50 8.67 7.84 20.2 255 93.0 74.7 41.8 15.8 11.8 17.9 20.0 14.0 22.8
45 9.43 8.17 28.4 303 107 83.3 47.8 18.4 15.2 20.4 21.6 15.1 29.0
40 10.0 9.29 42.1 365 124 92.9 54.0 21.0 18.1 23.1 23.2 16.3 35.8
35 11.5 9.94 61.2 444 150 103 61.8 25.5 21.7 26.3 25.8 17.9 45.5
30 12.8 10.6 103 546 174 117 72.1 30.0 26.4 30.6 29.3 19.6 57.7
25 13.9 11.9 157 675 210 135 87.8 37.0 33.2 36.5 34.0 21.7 72.2
20 15.5 13.7 212 822 248 158 111 45.4 41.5 43.3 40.3 24.0 97.4
15 18.0 15.9 316 1,010 303 194 143 60.7 50.2 51.4 49.2 26.6 141
10 21.7 18.2 540 1,380 392 246 187 83.3 66.0 61.9 54.7 32.5 230
5 26.1 28.1 928 2,160 671 352 288 150 120 87.2 63.2 42.7 484
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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 52.4 46.9 43.4 38.8
0.95 1.05 165 140 126 111 90.8
0.90 1.11 260 227 205 177 139
0.80 1.25 438 394 356 299 226
0.50 2 1,100 1,010 913 744 532
0.20 5 2,490 2,280 2,030 1,630 1,130
0.10 10 3,670 3,310 2,930 2,350 1,620
0.04 25 5,400 4,760 4,170 3,340 2,320
0.02 50 6,820 5,900 5,130 4,120 2,870
0.01 100 8,340 7,070 6,110 4,920 3,450
0.005 200 9,940 8,250 7,080 5,730 4,050
0.002 500 12,200 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 0 0 0 0.627 2.06 2.88 3.16
0.10 10 0 0.027 0.103 0.149 0.462 1.17 2.86 3.92 4.36
0.20 5 0.254 0.347 0.493 0.655 1.24 2.30 4.22 5.62 6.37
0.50 2 2.52 2.66 2.90 3.48 4.28 6.57 8.46 10.7 12.8
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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 0.456 0.531 0.898 1.24 1.47 12.79 14.11 5.44
0.10 10 1.25 11.42 1.59 2.05 2.11 12.29 2.47 8.92
0.20 5 2.37 2.38 2.76 3.36 3.21 3.55 4.82 15.8
0.50 2 5.65 6.22 6.24 7.02 7.37 12.0 15.2 43.4
June-July-August September-October-November
____________________________ _____________________________
0.05 20 0 0.116 0.395 1.33 0 0.024 0.181 0.395
0.10 10 0.094 0.475 1.05 2.54 0 0.196 0.451 0.896
0.20 5 1.11 1.72 2.67 5.16 0.399 0.734 1.14 2.05
0.50 2 8.08 9.41 10.5 16.2 3.68 4.63 5.15 7.80
____________________________________________________________________________________________
1Graphical interpretation.
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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)
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Annual peak discharge, by year, and corresponding gage height
1945 March 20 10.50 1,000 1970 April 8 12.80 1,220
1946 April 2 10.68 964 1971 April 17 16.31 2,310
1947 April 8 13.89 1,150 1972 March 27 12.26 1,120
1948 April 23 18.10 5,600 1973 March 15 7.52 260
1949 April 17 15.95 2,290 1974 April 15 16.40 2,460
1950 April 17 18.69 7,830 1975 April 25 15.35 1,490
1951 April 19 11.05 989 1976 April 2 13.45 1,450
1952 April 14 13.02 1,240 1977 April 5 5.49 136
1953 July 3 6.22 271 1978 April 12 14.13 1,460
1954 June 26 9.32 682 1979 April 20 17.87 4,680
1955 April 11 11.41 1,060 1980 April 9 10.57 750
1956 April 24 16.32 2,600 1981 March 23 8.61 500
1957 September 4 6.68 280 1982 April 12 15.83 1,900
1958 April 7 7.04 340 1983 April 12 16.24 1,610
1959 April 1 7.95 360 1984 April 3 15.13 1,850
1960 April 14 13.38 1,340 1985 March 23 11.74 930
1961 April 3 5.13 120 1986 March 23 15.56 1,760
1962 April 11 12.69 900 1987 April 5 18.21 4,840
1963 April 6 7.25 300 1988 April 5 10.96 389
1964 June 23 10.34 795 1989 April 16 11.95 796
1965 April 15 16.03 2,320 1990 June 30 10.30 159
1966 March 23 17.62 3,040 1991 May 6 7.09 84.0
1967 March 31 15.75 2,160 1992 March 16 13.72 1,100
1968 March 29 8.31 415 1993 July 25 18.33 2,780
1969 April 17 18.07 5,050 1994 April 1 15.31 1,750
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 April 17 18.69 7,830 1978 April 12 14.13 1,460
1948 April 23 18.10 5,600 1976 April 2 13.45 1,450
1969 April 17 18.07 5,050 1960 April 14 13.38 1,340
1987 April 5 18.21 4,840 1952 April 14 13.02 1,240
1979 April 20 17.87 4,680 1947 April 8 13.89 1,150
1966 March 23 17.62 3,040 1970 April 8 12.80 1,220
1993 July 25 18.33 2,780 1972 March 27 12.26 1,120
1956 April 24 16.32 2,600 1992 March 16 13.72 1,100
1974 April 15 16.40 2,460 1955 April 11 11.41 1,060
1965 April 15 16.03 2,320 1945 March 20 10.50 1,000
1971 April 17 16.31 2,310 1951 April 19 11.05 989
1949 April 17 15.95 2,290 1946 April 2 10.68 964
1967 March 31 15.75 2,160 1970 April 8 11.25 964
1982 April 12 15.83 1,900 1985 March 23 11.74 930
1984 April 3 15.13 1,850 1962 April 11 12.69 900
1986 March 23 15.56 1,760 1989 April 16 11.95 796
1994 April 1 15.31 1,750 1964 June 23 10.34 795
1983 April 12 16.24 1,610 1980 April 9 10.57 750
1975 April 25 15.35 1,490 1954 June 26 9.32 682
1981 March 23 8.61 500 1953 July 3 6.22 271
1968 March 29 8.31 415 1973 March 15 7.52 260
1988 April 5 10.96 389 1990 June 30 10.30 159
1959 April 1 7.95 360 1977 April 5 5.49 136
1958 April 7 7.04 340 1961 April 3 5.13 120
1963 April 6 7.25 300 1991 May 6 7.09 84.0
1957 September 4 6.68 280
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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
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