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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 1958 0.400 1991 19.5 34.2 1.75 1.74
November 97.0 1995 0.381 1990 13.0 22.2 1.71 1.15
December 34.5 1992 0.131 1987 4.83 5.73 1.19 0.43
January 12.1 1992 0.116 1987 2.90 2.62 0.90 0.26
February 23.6 1981 0.120 1987 3.42 4.09 1.20 0.30
March 690 1995 0.658 1934 69.9 124 1.77 6.22
April 1,980 1966 0.539 1991 428 418 0.98 38.1
May 1,500 1996 0.984 1991 219 320 1.46 19.4
June 1,340 1970 1.43 1980 161 263 1.63 14.3
July 1,140 1956 0.437 1988 110 218 1.98 9.79
August 1,350 1993 0.089 1988 48.6 185 3.80 4.33
September 525 1957 0 1937 44.3 104 2.36 3.94
Annual 312 1966 2.89 1934 94.3 80.8 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 0.25 0.18 0.46 2.10 2.20 1.10 0.53 0.24 0.32 0.41 0.38 0.36 0.41
90 0.34 0.38 0.63 4.51 3.74 2.00 1.40 0.71 0.60 0.84 0.47 0.43 0.59
85 0.47 0.55 1.10 8.84 5.01 3.98 1.90 1.00 0.81 1.10 0.75 0.51 0.86
80 0.55 0.80 1.60 16.8 7.92 5.05 2.99 1.50 1.10 1.40 0.95 0.74 1.30
75 1.00 0.97 1.60 26.4 12.8 5.77 3.87 1.50 1.50 1.70 1.20 1.50 1.80
70 1.40 1.20 1.60 36.4 17.7 8.39 4.40 2.10 1.50 1.70 1.90 1.80 1.80
65 1.40 1.40 2.10 56.4 22.6 12.1 5.27 2.10 2.00 2.20 2.40 1.80 2.77
60 1.70 1.70 2.10 81.4 28.2 14.8 6.64 2.10 2.00 2.80 2.40 2.20 3.24
55 2.00 1.70 3.18 111 34.3 18.6 8.02 3.43 2.87 3.50 3.00 2.60 3.92
50 2.00 1.70 3.60 147 44.5 24.0 11.0 3.86 3.34 4.48 3.00 2.60 4.42
45 2.30 2.10 4.11 189 63.9 31.4 14.6 4.51 3.80 4.93 4.11 2.60 5.64
40 2.30 2.10 4.87 239 89.1 42.2 18.3 4.95 4.54 5.38 4.59 3.20 7.14
35 2.70 2.50 6.25 305 121 57.8 22.8 6.57 5.73 6.48 5.25 3.80 10.6
30 2.70 3.00 11.0 389 178 83.9 31.9 7.85 8.10 9.55 6.37 4.50 16.7
25 3.20 3.00 16.9 508 257 144 49.9 11.4 13.8 13.0 9.27 4.50 26.5
20 3.80 3.70 34.3 689 337 217 81.0 17.2 22.9 20.0 14.5 6.83 47.6
15 5.20 4.50 58.8 946 424 304 137 29.0 44.1 29.7 23.7 8.68 96.9
10 6.47 6.83 147 1,280 643 430 238 76.1 106 53.9 34.4 12.3 215
5 9.20 10.6 499 1,950 1,030 770 655 217 242 103 58.3 16.3 532
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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 ng 60.7 43.7 26.5 16.8
0.95 1.05 344 176 136 89.9 57.2
0.90 1.11 476 292 233 159 102
0.80 1.25 692 507 419 296 191
0.50 2 1,350 1,240 1,070 788 516
0.20 5 2,480 2,470 2,170 1,630 1,090
0.10 10 3,330 3,280 2,910 2,190 1,470
0.04 25 4,470 4,240 3,760 2,810 1,910
0.02 50 5,360 4,880 4,310 3,210 2,200
0.01 100 6,260 5,440 4,790 3,550 2,450
0.005 200 7,190 5,940 5,220 3,840 2,670
0.002 500 8,450 ng ng ng ng
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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
1929 March 20 9.00 940 1968 July 19 11.08 2,290
1930 May 15 10.90 1,820 1969 April 14 14.01 3,520
1931 April 9 6.00 300 1970 April 14 14.51 4,140
1932 April 11 9.70 1,310 1971 April 8 9.00 1,500
1933 April 4 7.58 415 1972 April 15 8.50 1,480
1934 April 10 5.00 64.0 1973 March 14 10.18 800
1935 April 13 7.21 565 1974 April 24 11.35 2,460
1936 April 19 6.64 358 1975 July 6 10.37 1,960
1937 May 4 7.02 594 1976 April 1 7.24 980
1941 April 11 10.09 1,580 1977 April 8 5.06 219
1942 April 1 12.05 2,210 1978 April 12 12.12 2,770
1943 April 11 8.31 1,050 1979 April 22 13.17 3,340
1944 June 12 7.46 820 1980 April 8 6.90 820
1945 April 16 6.96 670 1981 June 30 5.39 340
1946 March 26 7.03 668 1982 April 2 7.94 1,040
1947 June 17 9.07 1,290 1983 March 8 9.33 1,530
1954 June 16 7.03 567 1984 April 3 6.45 623
1955 June 9 8.33 1,020 1985 June 26 12.16 2,790
1956 April 24 12.79 2,650 1986 March 29 11.47 2,510
1957 July 8 10.52 1,810 1987 March 27 7.62 996
1958 September 23 6.29 355 1988 March 24 8.46 1,170
1959 April 8 8.60 1,110 1989 April 19 10.78 2,100
1960 April 11 8.72 1,270 1990 April 1 7.10 784
1961 March 26 6.86 451 1991 July 13 11.35 2,160
1962 June 13 12.82 2,960 1992 April 2 10.82 1,870
1963 April 8 7.56 1,570 1993 August 10 12.87 3,050
1964 June 14 10.88 2,210 1994 March 26 -- 850
1965 April 15 12.30 2,780 1995 March 28 10.56 2,080
1966 April 5 18.23 5,410 1996 April 22 14.45 4,290
1967 April 21 11.43 2,430 1997 April 20 14.58 4,260
Annual peak discharge, from highest to lowest, and corresponding gage height
1966 April 5 18.23 5,410 1974 April 24 11.35 2,460
1996 April 22 14.45 4,290 1967 April 21 11.43 2,430
1997 April 20 14.58 4,260 1968 July 19 11.08 2,290
1970 April 14 14.51 4,140 1942 April 1 12.05 2,210
1969 April 14 14.01 3,520 1964 June 14 10.88 2,210
1979 April 22 13.17 3,340 1991 July 13 11.35 2,160
1993 August 10 12.87 3,050 1989 April 19 10.78 2,100
1962 June 13 12.82 2,960 1995 March 28 10.56 2,080
1985 June 26 12.16 2,790 1975 July 6 10.37 1,960
1965 April 15 12.30 2,780 1992 April 2 10.82 1,870
1978 April 12 12.12 2,770 1930 May 15 10.90 1,820
1956 April 24 12.79 2,650 1957 July 8 10.52 1,810
1986 March 29 11.47 2,510 1941 April 11 10.09 1,580
1963 April 8 7.56 1,570 1980 April 8 6.90 820
1983 March 8 9.33 1,530 1973 March 14 10.18 800
1971 April 8 9.00 1,500 1990 April 1 7.10 784
1972 April 15 8.50 1,480 1945 April 16 6.96 670
1932 April 11 9.70 1,310 1946 March 26 7.03 668
1947 June 17 9.07 1,290 1984 April 3 6.45 623
1960 April 11 8.72 1,270 1937 May 4 7.02 594
1988 March 24 8.46 1,170 1954 June 16 7.03 567
1959 April 8 8.60 1,110 1935 April 13 7.21 565
1943 April 11 8.31 1,050 1961 March 26 6.86 451
1982 April 2 7.94 1,040 1933 April 4 7.58 415
1955 June 9 8.33 1,020 1936 April 19 6.64 358
1987 March 27 7.62 996 1958 September 23 6.29 355
1976 April 1 7.24 980 1981 June 30 5.39 340
1929 March 20 9.00 940 1931 April 9 6.00 300
1994 March 26 -- 850 1977 April 8 5.06 219
1944 June 12 7.46 820 1934 April 10 5.00 64.0
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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
__________________________________________________________________________________________________________________________________
1929 10.0 8.13 3.71 2.16 2.00 311.9 160.7 36.1 23.0 7.39 1.00 1.50 47.7
1930 5.50 4.93 2.82 1.98 1.00 1.52 159.6 440.5 20.3 14.4 3.72 3.37 55.5
1931 4.94 4.19 2.95 2.16 2.00 24.9 83.1 15.6 8.97 4.98 4.45 3.47 13.4
1932 4.44 5.41 4.42 3.48 2.43 2.55 360.8 117.3 8.06 4.41 4.91 2.16 43.0
1933 2.88 3.87 2.74 2.00 1.36 14.6 191.5 21.2 14.2 2.28 2.46 2.25 21.6
1934 1.62 1.25 0.665 0.465 0.400 0.658 20.0 2.85 1.83 1.37 1.82 1.99 2.89
1935 4.60 3.72 2.24 1.00 0.800 29.5 163.8 35.4 7.24 4.46 1.92 2.84 21.4
1936 3.25 3.47 2.24 1.74 1.50 2.10 83.4 18.8 2.93 1.69 3.91 2.55 10.5
1937 23.9 -- -- -- -- -- -- 182.1 13.9 2.30 1.65 0 --
1941 -- -- -- -- -- -- 453.9 41.2 178.2 11.6 4.80 19.7 --
1942 131.1 23.6 5.99 3.00 2.57 154.4 675.4 456.5 45.7 5.83 15.6 35.0 129.9
1943 6.85 3.36 2.03 1.71 2.59 35.3 459.0 253.9 607.3 113.7 7.80 1.54 124.0
1944 0.887 -- -- -- -- -- 79.9 13.2 402.7 55.9 11.5 14.0 --
1945 6.65 23.0 11.6 -- -- -- 417.9 197.5 44.0 16.2 9.47 51.5 --
1946 34.2 12.6 5.58 3.41 2.41 220.4 248.4 29.8 5.76 15.0 3.72 2.99 48.9
1947 1.24 3.34 5.08 3.20 1.38 12.5 184.4 33.8 478.3 32.3 43.1 12.2 67.0
1954 5.32 0.867 1.16 2.45 6.36 2.80 208.5 135.2 167.7 9.79 5.51 3.97 45.6
1955 4.94 4.00 2.98 2.72 2.46 14.9 256.8 70.0 369.6 24.9 4.53 5.06 63.0
1956 8.25 3.78 3.30 3.58 3.88 34.2 711.8 445.2 192.5 1,136 40.6 97.6 224.3
1957 10.6 87.5 9.87 7.42 5.51 158.8 263.4 108.7 233.5 725.1 116.7 524.6 188.1
1958 153.0 77.0 13.8 8.48 2.12 2.16 47.7 14.8 6.74 98.7 4.77 9.68 36.9
1959 1.74 1.12 0.555 0.265 0.218 26.3 372.7 74.4 42.6 11.7 2.31 6.24 44.7
1960 22.4 11.3 4.30 4.78 4.79 4.95 534.2 55.2 53.5 13.1 3.86 1.33 58.8
1961 2.77 2.03 1.67 1.44 13.5 26.7 23.1 14.0 2.74 4.50 2.65 0.757 7.96
1962 2.54 1.36 4.43 3.63 3.21 30.3 369.6 655.4 1,031 109.5 77.3 11.8 191.4
1963 7.15 9.85 3.40 1.32 1.01 28.9 287.2 23.9 20.8 4.50 3.43 3.17 32.6
1964 2.59 1.21 0.745 0.600 0.600 0.765 196.3 118.8 742.9 40.2 7.09 6.72 92.2
1965 4.92 6.05 4.77 4.65 4.53 4.52 907.0 403.9 188.4 57.8 6.00 34.3 135.0
1966 99.4 16.0 13.8 10.8 8.91 11.7 1,977 913.2 250.3 282.9 124.9 41.6 312.2
1967 10.2 3.23 3.28 1.71 1.16 22.7 1,157 664.5 110.0 4.38 5.70 2.84 165.2
1968 2.07 2.79 2.26 1.55 1.35 125.3 69.0 5.66 502.8 707.0 193.9 239.7 154.7
1969 74.9 31.1 9.92 5.43 4.83 3.31 1,158 299.1 104.3 10.6 4.45 6.21 141.8
1970 3.71 2.45 2.07 1.97 1.67 3.06 751.4 1,338 1,336 131.1 12.3 6.55 299.1
1971 15.8 35.5 4.54 3.53 2.51 32.2 516.6 58.3 13.5 5.09 3.35 2.98 57.4
1972 2.06 11.0 4.55 2.55 2.79 65.6 444.6 42.9 31.0 4.51 3.68 4.18 51.1
1973 3.98 2.21 1.86 2.96 6.01 46.2 5.57 5.46 3.38 4.15 1.81 4.26 7.37
1974 7.94 4.78 2.59 1.86 1.70 1.61 882.1 634.7 253.2 12.3 30.4 8.30 153.2
1975 4.39 3.78 2.89 2.23 1.67 1.26 607.7 526.3 130.1 474.7 5.18 5.03 147.9
1976 4.15 3.55 3.28 1.99 1.68 59.0 207.7 10.4 7.81 4.16 3.02 3.38 25.7
1977 7.47 1.06 0.463 0.598 0.847 2.76 35.8 3.87 13.9 2.28 4.31 2.34 6.27
1978 0.780 0.420 2.06 2.52 1.85 2.04 778.3 103.1 27.9 102.3 5.51 1.33 85.1
1979 3.92 1.99 1.29 1.94 2.29 14.7 992.1 489.8 203.2 52.8 3.24 2.73 147.0
1980 5.60 0.993 2.55 2.14 1.83 3.32 216.9 4.14 1.43 3.12 1.31 0.960 20.1
1981 1.03 1.64 5.04 0.989 23.6 39.5 9.71 6.71 36.9 34.3 0.941 0.874 13.4
1982 6.13 -- -- -- -- -- -- -- -- -- -- -- --
1985 -- -- -- -- -- -- 280.9 211.8 482.8 385.6 360.3 279.5 --
1986 112.9 32.6 16.8 4.82 2.54 361.8 818.6 574.8 33.6 14.0 8.53 25.6 167.9
1987 5.59 0.418 0.131 0.116 0.120 200.7 288.3 35.2 9.43 7.52 1.29 0.656 45.8
1988 0.430 1.55 1.38 0.661 0.600 253.3 165.2 4.34 3.37 0.437 0.089 0.523 36.1
1989 1.57 0.503 0.549 0.338 0.177 1.49 407.2 35.9 68.0 17.3 2.99 1.10 44.3
1990 21.6 0.381 0.378 0.322 0.291 115.9 60.1 3.50 6.69 10.2 27.0 3.17 21.0
1991 0.400 0.484 0.413 0.346 2.90 10.2 0.539 0.984 13.4 527.4 27.4 217.2 67.4
1992 76.0 69.4 34.5 12.1 12.5 200.8 1,010 170.9 20.5 16.8 6.28 88.2 142.2
1993 34.6 0.527 0.443 0.472 0.520 5.93 201.1 46.2 107.8 340.4 1,349 431.6 211.9
1994 34.8 24.1 9.59 6.08 3.94 199.5 112.3 24.6 10.3 29.5 19.3 225.5 58.4
1995 65.7 97.0 13.3 6.46 3.98 689.5 187.7 259.5 42.6 245.0 119.7 18.7 147.6
1996 17.1 22.4 8.77 6.59 7.32 10.7 1,351 1,500 362.1 148.1 45.0 31.5 292.5
1997 1.94 8.51 4.02 0.191 9.58 6.42 1,352 477.0 80.7 164.7 5.64 7.82 175.9
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