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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 224 1972 9.43 1977 35.4 39.4 1.11 3.80
November 209 1972 8.64 1956 29.0 29.1 1.00 3.11
December 48.7 1972 5.11 1964 17.9 9.84 0.55 1.92
January 31.5 1996 2.02 1962 13.2 6.73 0.51 1.42
February 46.8 1984 3.55 1962 12.9 7.23 0.56 1.39
March 455 1995 5.81 1948 79.7 104 1.31 8.56
April 1,570 1997 25.3 1981 378 342 0.90 40.6
May 1,160 1950 23.7 1958 124 163 1.31 13.3
June 596 1984 11.5 1980 96.1 103 1.07 10.3
July 478 1997 8.95 1980 79.0 98.3 1.24 8.49
August 426 1993 6.30 1961 38.4 65.6 1.71 4.12
September 124 1994 6.49 1955 27.2 24.6 0.91 2.92
Annual 221 1997 18.4 1977 77.5 49.3 0.64 100
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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 4.50 4.90 6.62 24.7 24.7 15.7 10.2 6.69 6.50 9.35 10.2 5.80 6.48
90 5.00 5.40 8.10 33.9 30.0 20.1 13.5 8.12 8.45 11.1 11.6 7.80 8.70
85 6.20 6.80 8.74 43.8 33.3 23.4 15.4 8.91 9.70 12.0 12.7 8.60 10.3
80 6.80 6.80 10.5 54.2 36.3 26.1 17.1 10.6 10.5 12.9 13.9 10.3 11.5
75 7.60 7.60 11.8 63.5 39.8 29.3 18.7 11.6 11.8 13.9 15.0 10.9 12.7
70 8.50 8.73 13.0 76.3 43.6 33.1 20.9 13.0 12.8 14.9 16.1 11.6 14.4
65 9.90 9.84 14.0 90.7 48.1 37.2 23.7 14.2 13.9 16.6 17.4 12.3 15.9
60 11.2 11.1 15.1 106 53.8 40.5 27.0 15.7 15.0 18.7 19.1 13.3 18.0
55 11.8 11.8 17.8 127 60.9 43.8 30.5 17.2 16.1 20.2 20.8 14.4 20.1
50 12.4 12.3 19.9 154 70.2 48.3 34.4 19.0 17.5 21.6 22.6 15.4 22.7
45 13.0 12.8 22.0 187 78.3 52.9 38.9 21.1 18.9 23.1 24.8 16.3 25.6
40 13.8 13.4 25.5 229 88.2 60.0 43.9 23.6 20.3 24.6 26.6 17.5 29.3
35 14.7 14.1 29.6 281 99.9 67.6 49.5 26.7 22.3 27.4 28.4 19.4 33.5
30 15.7 14.7 36.2 344 114 75.9 59.0 30.1 24.8 30.4 30.3 22.0 40.0
25 17.4 15.9 49.4 409 132 88.5 69.7 34.1 29.7 34.3 32.4 24.5 49.5
20 19.1 17.5 71.9 520 160 111 87.6 40.4 36.5 42.6 35.7 26.5 64.6
15 21.3 18.8 106 678 191 145 118 49.4 45.4 59.1 41.8 28.9 90.1
10 24.1 21.9 208 961 240 211 184 64.2 59.9 78.5 48.0 32.7 145
5 28.1 25.2 401 1,570 346 337 332 113 82.7 107 62.0 36.9 309
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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 1.01 104 73.8 60.7 46.0 34.2
0.95 1.05 218 162 131 98.3 71.4
0.90 1.11 317 243 195 145 104
0.80 1.25 492 389 311 228 161
0.50 2 1,080 912 727 520 354
0.20 5 2,240 2,010 1,610 1,120 735
0.10 10 3,200 2,960 2,380 1,630 1,050
0.04 25 4,590 4,400 3,560 2,390 1,510
0.02 50 5,740 5,630 4,580 3,040 1,900
0.01 100 6,970 16,860 5,710 3,750 2,310
0.005 200 8,290 18,180 6,950 4,530 2,750
0.002 500 10,200 ng ng ng ng
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1 Statistical adjustment based on correlation between
3-, 7-, 15-, and 30-consecutive-day periods.
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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
1943 April 7 10.48 941 1971 April 8 13.60 1,460
1944 August 18 -- 226 1972 April 13 14.03 2,160
1945 April 11 9.18 767 1973 March 17 11.25 897
1946 March 27 -- 675 1974 April 16 15.87 1,890
1947 April 19 13.28 1,840 1975 April 20 19.24 2,550
1948 April 14 -- 1,640 1976 April 2 13.60 1,390
1949 June 1 10.40 990 1977 May 31 -- 298
1950 April 22 16.31 3,040 1978 April 10 27.21 3,060
1951 April 11 11.90 1,250 1979 April 20 -- 3,400
1952 April 12 9.52 544 1980 April 5 10.10 879
1953 March 29 -- 219 1981 May 24 7.20 362
1954 June 15 -- 489 1982 April 15 10.00 820
1955 April 8 10.35 842 1983 June 14 11.00 1,230
1956 April 20 10.72 1,370 1984 June 9 15.60 2,850
1957 June 29 7.06 481 1985 August 17 10.50 974
1958 July 5 -- 168 1986 March 29 16.21 2,000
1959 April 2 7.64 310 1987 July 29 7.95 492
1960 April 6 8.80 460 1988 March 5 8.94 610
1961 March 25 4.86 140 1989 March 10 25.00 2,430
1962 July 8 11.70 1,570 1990 June 2 7.52 405
1963 April 7 6.34 300 1991 May 23 8.71 613
1964 April 17 9.40 730 1992 August 25 -- 312
1965 April 14 17.81 4,560 1993 August 3 16.13 1,320
1966 April 2 17.33 4,220 1994 July 8 12.67 1,660
1967 March 30 14.46 2,060 1995 March 17 13.77 1,340
1968 June 7 12.71 1,400 1996 April 19 25.17 4,290
1969 April 14 24.57 4,180 1997 April 20 39.40 4,360
1970 April 16 13.64 1,980
Annual peak discharge, from highest to lowest, and corresponding gage height
1965 April 14 17.81 4,560 1947 April 19 13.28 1,840
1997 April 20 39.40 4,360 1994 July 8 12.67 1,660
1996 April 19 25.17 4,290 1948 April 14 -- 1,640
1966 April 2 17.33 4,220 1962 July 8 11.70 1,570
1969 April 14 24.57 4,180 1971 April 8 13.60 1,460
1979 April 20 -- 3,400 1968 June 7 12.71 1,400
1978 April 10 27.21 3,060 1976 April 2 13.60 1,390
1950 April 22 16.31 3,040 1956 April 20 10.72 1,370
1984 June 9 15.60 2,850 1995 March 17 13.77 1,340
1975 April 20 19.24 2,550 1993 August 3 16.13 1,320
1989 March 10 25.00 2,430 1951 April 11 11.90 1,250
1972 April 13 14.03 2,160 1983 June 14 11.00 1,230
1967 March 30 14.46 2,060 1949 June 1 10.40 990
1986 March 29 16.27 2,000 1985 August 17 10.50 974
1970 April 16 13.64 1,980 1943 April 7 10.48 941
1974 April 16 15.87 1,890 1973 March 17 11.25 897
1980 April 5 10.10 879 1960 April 6 8.80 460
1955 April 8 10.35 842 1990 June 2 7.52 405
1982 April 15 10.00 820 1981 May 24 7.20 362
1945 April 11 9.18 767 1992 August 25 -- 312
1964 April 17 9.40 730 1959 April 2 7.64 310
1946 March 27 -- 675 1963 April 7 6.34 300
1991 May 23 8.71 613 1977 May 31 -- 298
1988 March 5 8.94 610 1944 August 18 -- 226
1952 April 12 9.52 544 1953 March 29 -- 219
1987 July 29 7.95 492 1958 July 5 -- 168
1954 June 15 -- 489 1961 March 25 4.86 140
1957 June 29 7.06 481
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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
__________________________________________________________________________________________________________________________________
1943 -- -- -- -- -- -- 307.4 117.5 234.9 66.2 33.4 19.5 --
1944 18.4 17.1 -- -- -- -- 63.8 58.7 58.3 98.0 125.3 72.6 --
1945 46.2 46.5 26.1 -- -- 181.0 294.9 145.0 97.5 41.7 30.5 45.4 --
1946 57.6 34.4 -- -- -- 145.3 225.2 74.6 42.4 32.3 12.9 18.7 --
1947 35.8 24.4 13.6 12.7 13.0 24.0 687.1 191.9 368.6 65.4 30.3 19.4 123.1
1948 19.3 18.6 11.3 8.74 6.45 5.81 511.0 75.9 34.7 33.8 22.3 12.7 62.8
1949 12.5 16.9 13.5 9.08 8.95 14.5 171.9 60.4 196.6 69.2 28.9 12.9 51.1
1950 24.0 27.5 18.0 11.0 7.00 9.90 818.5 1156 115.4 181.3 43.1 18.4 203.7
1951 32.5 21.8 16.0 14.0 12.0 10.8 428.7 131.5 44.6 20.3 18.4 25.6 64.4
1952 21.1 20.7 14.0 12.0 11.0 15.0 221.9 46.8 21.5 52.9 18.6 14.6 39.0
1953 18.8 20.7 13.3 7.90 10.8 68.4 99.2 65.9 80.3 49.7 28.6 16.3 40.1
1954 12.5 13.5 10.9 5.29 6.44 20.1 144.1 57.0 81.6 29.3 10.9 7.99 33.2
1955 10.8 12.9 8.32 6.81 7.36 7.42 150.2 31.5 34.4 15.6 12.4 6.49 25.2
1956 10.4 8.64 6.13 5.23 5.41 7.42 316.7 105.3 60.1 16.0 11.5 11.5 46.7
1957 13.6 20.4 10.4 8.52 7.54 48.6 120.3 41.1 118.6 130.5 23.6 52.0 49.6
1958 31.4 43.0 17.4 13.9 12.4 22.2 30.7 23.7 25.6 62.9 17.9 11.3 26.1
1959 12.9 17.5 7.24 4.81 3.84 36.9 78.6 68.2 27.5 16.5 14.3 7.89 24.8
1960 18.7 11.8 12.2 12.0 9.78 16.3 162.1 39.3 47.0 41.6 16.1 14.5 33.3
1961 11.8 16.2 8.38 6.71 7.28 64.3 52.8 41.7 13.3 10.2 6.30 9.83 20.8
1962 17.2 12.5 6.58 2.02 3.55 6.21 253.7 232.5 292.6 298.0 60.1 46.8 102.9
1963 36.0 32.4 17.4 9.25 4.94 37.4 94.4 47.2 57.5 33.4 12.1 10.6 32.8
1964 10.8 8.88 5.11 6.60 9.59 11.8 226.2 88.8 48.3 68.1 17.6 34.5 44.5
1965 24.8 19.6 11.5 10.8 8.34 10.6 916.7 135.5 126.0 54.9 25.4 30.7 113.7
1966 71.6 32.3 32.7 18.1 16.2 384.6 934.6 191.7 67.7 25.2 27.7 21.9 151.9
1967 18.9 12.3 10.5 12.5 14.3 90.0 340.9 102.4 73.0 26.5 12.7 12.1 60.3
1968 13.4 12.9 13.0 10.2 7.96 100.8 67.9 37.6 269.3 48.5 15.0 12.2 50.5
1969 21.0 19.4 12.6 4.70 5.64 7.50 669.0 129.7 103.2 50.0 20.4 24.8 88.4
1970 30.5 19.7 16.3 13.0 11.1 12.7 751.3 241.2 165.3 37.5 16.8 13.3 110.2
1971 25.0 30.4 11.3 11.6 12.5 43.3 345.1 61.3 36.5 17.3 10.5 33.2 52.8
1972 223.5 209.3 48.7 25.8 19.1 318.5 716.6 169.5 49.2 29.0 33.4 17.4 154.7
1973 22.5 32.7 12.7 11.0 12.2 228.1 51.1 37.5 22.5 12.2 12.6 80.3 44.9
1974 95.0 45.6 23.3 18.7 18.0 19.0 711.5 300.4 87.5 19.4 24.6 18.6 114.8
1975 18.5 33.9 17.0 11.9 13.7 23.5 756.1 220.8 48.9 182.3 35.3 18.6 114.8
1976 22.9 27.1 19.2 15.9 15.1 83.8 316.8 41.3 33.3 19.5 10.7 7.34 50.8
1977 9.43 10.2 8.91 7.86 8.18 18.9 51.6 32.6 40.6 10.9 6.96 15.4 18.4
1978 21.1 26.3 27.9 18.3 13.2 37.2 946.0 63.4 53.5 21.6 15.3 17.2 104.1
1979 13.6 14.8 13.3 12.1 12.9 17.2 868.9 160.5 71.1 166.0 45.2 17.8 117.3
1980 18.0 28.1 24.0 19.2 21.3 42.9 280.0 33.5 11.5 8.95 10.2 11.1 42.1
1981 15.4 15.3 9.56 8.05 12.2 32.8 25.3 50.7 38.8 24.3 17.1 34.5 23.7
1982 59.5 35.4 22.3 12.1 10.3 49.9 347.5 144.4 35.7 42.4 12.7 10.2 65.2
1983 81.8 27.5 26.9 19.2 19.0 333.9 181.4 54.7 228.1 113.2 49.4 72.0 101.0
1984 70.2 49.9 35.9 26.8 46.8 201.5 336.8 55.5 595.8 44.6 17.0 11.8 123.5
1985 -- -- -- -- -- -- -- -- 168.3 181.3 256.2 93.9 --
1986 88.1 47.0 38.1 30.1 22.9 217.4 579.4 269.1 69.5 82.9 26.8 21.2 124.6
1987 24.0 28.1 22.4 17.2 16.1 185.2 80.1 110.1 60.1 138.3 104.2 27.8 68.4
1988 26.5 27.2 24.5 20.3 16.4 126.4 209.1 37.1 36.4 13.8 9.88 14.0 46.7
1989 13.2 17.0 15.0 13.8 11.2 14.2 776.6 79.7 40.8 28.4 12.2 14.4 85.6
1990 14.9 14.5 7.08 8.58 11.3 59.7 88.6 39.3 58.9 16.8 8.05 7.73 27.9
1991 9.99 12.1 10.3 6.27 10.9 51.0 48.9 97.1 30.8 31.2 9.78 10.1 27.5
1992 12.9 10.7 10.0 10.5 14.1 80.2 53.9 36.3 20.4 28.3 53.3 84.9 34.6
1993 22.0 27.2 23.6 14.2 12.1 39.4 338.5 46.2 50.8 224.9 426.1 41.2 106.2
1994 22.7 21.6 25.2 17.4 14.0 52.5 221.7 105.3 175.0 375.5 63.7 123.6 101.9
1995 135.7 89.6 37.9 23.2 22.0 455.3 229.4 156.8 40.8 326.8 45.0 27.3 133.8
1996 135.5 55.3 36.3 31.5 28.7 31.1 1,167 370.8 90.6 33.3 20.0 17.7 167.1
1997 23.1 36.6 27.6 24.0 21.9 24.2 1,568 176.2 185.9 478.0 62.2 40.4 221.4
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