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Statistics of monthly and annual mean discharges
[m, more than 1 year of occurrence]
__________________________________________________________________________________________________________
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 186 1958 5.48 1940 50.5 46.4 0.92 3.15
November 305 1972 8.74 1937 48.0 44.2 0.92 3.00
December 97.0 1972 4.75 1938 29.2 19.4 0.66 1.82
January 53.5 m 0.868 1940 19.3 12.1 0.63 1.21
February 61.1 1984 0.759 1940 19.4 12.7 0.65 1.21
March 1,310 1966 2.26 1940 176 239 1.36 11.0
April 1,980 1978 33.5 1931 535 478 0.89 33.4
May 909 1986 27.2 1931 216 194 0.90 13.5
June 2,140 1962 15.1 1934 197 310 1.58 12.3
July 2,810 1975 2.23 1936 185 412 2.23 11.5
August 910 1993 0 1936 72.9 151 2.07 4.55
September 518 1944 0.790 1936 54.1 81.6 1.51 3.38
Annual 440 1975 25.6 1934 135 90.1 0.67 100
__________________________________________________________________________________________________________
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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 3.60 3.50 4.24 43.9 30.0 16.9 4.48 1.40 3.10 7.56 10.1 5.90 5.52
90 5.85 5.04 10.3 67.9 43.7 21.9 8.33 4.83 5.24 10.1 12.7 8.38 8.74
85 8.24 7.34 13.7 87.3 54.6 27.8 12.6 6.71 7.16 13.7 16.5 10.5 12.4
80 8.86 9.04 16.0 102 64.7 33.0 16.7 9.36 10.3 16.5 18.9 14.0 15.3
75 11.2 11.2 18.3 117 74.3 39.9 21.0 12.0 12.4 19.2 22.3 15.7 17.8
70 12.7 13.2 20.7 132 85.6 47.9 25.1 14.5 14.5 21.5 24.9 17.3 20.3
65 13.7 14.1 23.7 157 96.5 56.7 29.2 17.0 16.8 25.3 28.0 19.0 23.7
60 14.7 15.0 27.4 186 108 65.3 34.7 19.3 19.7 27.4 30.6 20.6 27.4
55 15.9 15.9 31.9 220 121 73.5 40.4 21.6 22.8 19.4 32.9 22.1 31.5
50 17.0 17.1 37.0 260 139 84.4 48.4 23.9 26.0 32.3 35.7 23.6 37.0
45 18.2 18.4 43.5 311 157 96.6 58.2 28.7 29.4 35.4 38.9 25.0 42.6
40 19.8 19.6 51.3 370 176 110 71.0 34.1 32.9 38.5 43.7 28.0 52.4
35 21.4 21.5 61.6 436 199 127 85.6 40.5 38.8 42.3 49.6 30.1 63.2
30 23.5 23.7 89.1 512 227 149 107 48.3 45.9 50.0 55.1 32.8 79.5
25 25.8 26.1 124 619 260 180 133 56.6 54.0 60.8 62.0 36.4 102
20 28.3 28.7 170 786 300 228 172 71.0 66.9 75.4 69.1 42.2 134
15 31.0 31.3 248 1,000 352 286 239 93.2 86.7 91.4 76.2 51.9 189
10 36.3 37.1 405 1,320 429 399 354 148 128 118 84.7 61.8 295
5 47.4 47.5 834 1,970 620 682 694 298 212 162 120 70.0 533
______________________________________________________________________________________________________________________
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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 135 114 90.2 69.2
0.95 1.05 258 260 225 176 134
0.90 1.11 375 368 322 250 189
0.80 1.25 586 563 493 379 283
0.50 2 1,360 1,270 1,100 825 595
0.20 5 3,120 2,870 2,390 1,750 1,210
0.10 10 4,780 4,400 3,560 2,570 1,720
0.04 25 7,480 6,960 5,420 3,840 2,490
0.02 50 9,970 9,350 7,080 4,960 3,130
0.01 100 12,900 12,200 8,980 6,220 3,850
0.005 200 16,300 15,600 11,100 7,640 4,620
0.002 500 21,600 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 0.401 0.478 0.547 0.679 0.990 1.25 2.77 4.76 6.70
0.10 10 1.07 1.23 1.38 1.68 2.23 2.84 4.54 6.84 9.16
0.20 5 2.70 3.00 3.32 3.91 4.77 6.29 7.70 10.3 13.2
0.50 2 9.38 9.93 10.6 11.8 13.1 16.7 17.1 20.2 25.5
____________________________________________________________________________________
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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 1.64 1.70 1.78 2.07 3.38 3.69 4.03 9.30
0.10 10 3.38 3.52 3.70 4.06 5.34 5.77 6.51 14.9
0.20 5 6.87 7.16 7.50 7.84 8.74 9.45 11.0 25.4
0.50 2 16.5 17.1 17.6 17.9 18.8 21.0 25.4 63.3
June-July-August September-October-November
_________________________ ___________________________
0.05 20 0.702 1.08 1.55 2.37 1.42 2.29 12.84 3.40
0.10 10 1.71 2.38 3.07 4.34 2.68 3.78 14.65 5.53
0.20 5 4.12 5.23 6.23 8.24 5.10 6.46 7.13 9.50
0.50 2 14.8 17.0 19.0 23.8 13.5 15.9 20.3 23.4
_____________________________________________________________________________________
1Graphical interpretation.
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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
1931 April 10 -- 46.0 1963 June 7 14.76 1,300
1932 April 12 8.83 311 1964 April 22 16.40 1,740
1933 April 3 9.02 269 1965 April 11 23.37 5,960
1934 April 10 9.02 374 1966 March 18 23.31 5,000
1935 March 21 9.09 311 1967 March 30 16.68 1,820
1936 April 16 14.59 1,460 1968 March 30 8.92 406
1937 April 14 9.00 390 1969 April 11 25.55 10,400
1938 May 5 8.78 550 1970 April 12 12.85 802
1939 March 29 15.77 1,350 1971 April 10 9.81 493
1940 April 7 10.29 510 1972 March 19 19.36 2,590
1941 April 4 12.71 800 1973 March 18 -- 205
1942 May 6 10.94 762 1974 April 14 17.97 2,130
1943 April 2 22.60 4,530 1975 July 2 27.10 13,600
1944 August 20 12.81 998 1976 April 1 13.50 1,000
1945 March 20 19.38 2,660 1977 June 5 5.99 163
1946 March 22 17.05 1,670 1978 March 31 22.76 5,420
1947 April 13 20.26 3,380 1979 April 16 21.60 4,380
1948 April 8 14.44 1,310 1980 April 4 16.78 1,850
1949 April 8 11.17 602 1981 May 23 13.02 1,090
1950 April 7 -- 2,600 1982 April 2 17.80 2,210
1951 April 7 17.47 2,230 1983 July 9 16.75 1,990
1952 April 10 21.24 4,310 1984 March 29 19.27 2,940
1953 June 20 18.43 2,430 1985 June 5 15.53 1,940
1954 April 12 11.54 686 1986 March 28 20.50 3,440
1955 April 4 14.85 1,260 1987 March 13 13.19 954
1956 April 12 18.37 2,410 1988 April 4 10.55 648
1957 April 24 13.70 1,080 1989 April 6 22.80 5,380
1958 July 11 15.70 1,540 1990 April 3 12.40 600
1959 June 23 11.81 699 1991 May 6 10.66 576
1960 April 30 15.12 1,390 1992 June 22 -- 492
1961 May 19 9.90 480 1993 July 20 22.88 3,450
1962 June 11 23.56 6,140 1994 March 24 20.82 3,270
Annual peak discharge, from highest to lowest, and corresponding gage height
1975 July 2 27.10 13,600 1986 March 28 20.50 3,440
1969 April 11 25.55 10,400 1947 April 13 20.26 3,380
1962 June 11 23.56 6,140 1994 March 24 20.82 3,270
1965 April 11 23.37 5,960 1984 March 29 19.27 2,940
1978 March 31 22.76 5,420 1945 March 20 19.38 2,660
1989 April 6 22.80 5,380 1950 April 7 -- 2,600
1966 March 18 23.31 5,000 1972 March 19 19.36 2,590
1943 April 2 22.60 4,530 1953 June 20 18.43 2,430
1979 April 16 21.60 4,380 1956 April 12 18.37 2,410
1952 April 10 21.24 4,310 1951 April 7 17.47 2,230
1993 July 20 22.88 3,450 1982 April 2 17.80 2,210
1974 April 14 17.97 2,130 1942 May 6 10.94 762
1983 July 9 16.75 1,990 1959 June 23 11.81 699
1985 June 5 15.53 1,940 1954 April 12 11.54 686
1980 April 4 16.78 1,850 1988 April 4 10.55 648
1967 March 30 16.68 1,820 1949 April 8 11.17 602
1964 April 22 16.40 1,740 1990 April 3 12.40 600
1946 March 22 17.05 1,670 1991 May 6 10.66 576
1958 July 11 15.70 1,540 1938 May 5 8.78 550
1936 April 16 14.59 1,460 1940 April 7 10.29 510
1960 April 30 15.12 1,390 1971 April 10 9.81 493
1939 March 29 15.77 1,350 1992 June 22 -- 492
1948 April 8 14.44 1,310 1961 May 19 9.90 480
1963 June 7 14.76 1,300 1968 March 30 8.92 406
1955 April 4 14.85 1,260 1937 April 14 9.00 390
1981 May 23 13.02 1,090 1934 April 10 9.02 374
1957 April 24 13.70 1,080 1932 April 12 8.83 311
1976 April 1 13.50 1,000 1935 March 21 9.09 311
1944 August 20 12.81 998 1933 April 3 9.02 269
1987 March 13 13.19 954 1973 March 18 -- 205
1970 April 12 12.85 802 1977 June 5 5.99 163
1941 April 4 12.71 800 1931 April 10 -- 46.0
_____________________________________________________________________________________
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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
__________________________________________________________________________________________________________________________________
1931 -- -- -- -- -- -- 33.5 27.2 26.1 17.4 12.7 6.18 --
1932 13.3 18.0 14.0 10.8 11.5 54.2 123.0 51.4 31.6 6.66 2.85 5.73 28.5
1933 12.7 9.67 5.88 4.62 4.40 90.5 119.3 60.9 24.0 9.01 7.27 7.78 29.8
1934 15.3 17.6 15.0 11.0 15.0 38.0 141.3 28.5 15.1 4.09 1.45 5.73 25.6
1935 19.4 10.6 9.64 9.16 15.0 123.8 76.8 60.3 42.9 40.2 15.9 8.66 36.2
1936 16.8 9.99 6.29 2.97 1.00 65.0 579.1 98.3 17.6 2.23 0 0.790 66.1
1937 6.39 8.74 6.00 6.00 5.00 3.00 136.8 104.6 46.9 14.1 17.2 14.8 30.8
1938 11.4 10.7 4.75 4.34 5.46 105.7 51.2 247.1 85.4 17.1 7.00 7.23 46.9
1939 7.50 11.3 7.97 5.80 4.17 216.0 270.2 32.2 18.8 7.84 1.74 1.75 48.8
1940 5.48 10.5 8.16 0.868 0.759 2.26 228.8 64.1 18.0 6.26 11.1 5.78 29.9
1941 8.99 14.9 9.48 9.44 9.84 61.6 350.6 46.7 61.5 12.3 7.40 19.1 50.7
1942 25.5 23.9 11.2 2.24 1.56 29.1 87.1 295.8 208.7 35.8 31.4 152.7 75.6
1943 74.8 58.0 21.2 10.7 8.12 74.2 1,158 234.2 434.0 247.5 109.3 41.8 205.2
1944 28.5 36.7 15.5 8.65 9.76 23.4 214.3 230.1 263.4 473.3 710.0 517.5 211.5
1945 134.4 128.6 63.8 21.6 15.9 861.3 582.8 246.4 133.9 31.1 22.2 50.7 192.1
1946 49.1 31.0 20.6 13.1 9.52 441.4 229.8 101.0 86.9 269.4 53.1 32.2 112.4
1947 76.4 66.0 41.4 30.1 21.5 127.7 1,054 267.9 274.1 67.7 18.4 20.0 171.4
1948 27.1 25.7 22.6 17.0 16.2 44.4 618.1 98.7 62.1 34.7 23.6 14.6 83.0
1949 13.6 17.6 14.0 10.9 9.84 18.2 215.3 108.5 36.8 101.4 55.1 17.0 51.6
1950 24.9 28.9 21.5 9.55 6.18 202.5 1,577 852.2 167.5 53.1 16.1 12.7 247.5
1951 19.7 17.3 15.6 13.5 13.8 19.2 800.4 144.3 173.3 51.6 32.9 38.7 110.9
1952 57.2 44.5 38.6 27.3 26.7 28.8 1,284 120.1 32.7 507.9 231.9 91.7 206.9
1953 35.8 40.1 23.1 15.7 17.4 202.3 295.0 249.5 955.8 132.9 206.0 53.5 185.3
1954 29.7 31.1 26.1 22.1 31.9 98.9 358.0 263.3 142.7 45.5 20.3 25.8 91.2
1955 39.0 32.6 18.6 13.0 13.3 14.5 367.8 89.3 99.5 466.1 435.3 55.9 138.1
1956 44.9 30.6 20.9 16.8 20.1 25.0 1,034 221.4 98.2 26.0 23.7 14.1 130.2
1957 19.7 38.9 18.0 13.9 14.2 187.4 346.1 145.1 210.1 198.1 65.2 336.0 132.6
1958 186.2 159.7 51.4 31.6 26.6 60.7 115.9 77.8 139.5 653.1 53.8 79.8 137.4
1959 51.1 85.0 39.0 16.9 13.6 116.5 212.3 171.4 389.0 388.4 87.5 54.2 135.9
1960 52.0 40.5 35.0 34.3 26.9 62.3 837.1 356.5 126.0 103.0 42.0 44.2 146.0
1961 27.4 30.9 20.7 17.5 16.5 142.6 162.7 247.2 51.9 19.4 9.02 16.2 63.9
1962 26.2 22.1 15.1 9.89 11.4 15.0 673.6 906.2 2,138 563.4 153.4 65.5 382.6
1963 56.1 68.1 35.4 9.60 6.23 94.7 232.4 158.5 492.2 29.8 70.6 101.8 112.6
1964 38.2 34.1 20.6 16.8 18.1 44.5 854.1 349.1 119.2 43.5 18.4 29.0 131.4
1965 34.8 34.6 14.6 15.8 16.4 17.0 1,392 309.2 260.8 77.6 40.3 55.8 187.8
1966 110.7 73.2 65.3 36.5 29.1 1,308 638.6 405.5 105.3 82.5 185.7 49.1 259.8
1967 57.9 43.3 33.9 36.3 39.9 195.1 851.3 280.7 328.1 84.1 20.5 16.0 165.0
1968 20.3 19.8 19.0 10.5 10.3 92.4 169.1 129.4 108.1 75.5 22.4 32.6 59.1
1969 57.1 53.3 27.4 17.3 15.0 17.9 1,903 195.6 63.8 98.4 31.7 17.2 206.4
1970 35.2 40.6 25.3 19.1 18.4 42.8 439.5 258.5 245.3 51.4 9.10 9.44 99.3
1971 20.3 34.5 18.5 12.5 13.7 83.6 255.3 84.4 59.3 116.1 21.2 122.0 70.0
1972 185.6 305.4 97.0 34.9 30.4 714.4 622.7 419.6 134.9 44.8 46.6 29.5 222.7
1973 28.2 42.6 25.0 15.7 15.7 122.2 97.6 66.8 36.2 22.9 23.5 131.7 52.4
1974 184.2 82.5 56.4 30.5 32.6 52.0 773.8 455.6 186.1 69.0 55.0 29.7 167.3
1975 33.0 46.6 27.4 20.2 19.0 27.0 951.1 394.4 805.1 2,814 78.9 31.4 440.5
1976 48.0 58.7 33.2 25.3 28.5 194.5 306.6 66.5 23.8 10.1 1.74 2.54 66.5
1977 8.42 12.5 8.46 8.82 9.37 41.4 89.3 35.2 37.0 28.7 5.48 36.7 26.7
1978 96.6 67.9 66.9 51.2 30.7 388.5 1,984 187.5 61.3 36.3 13.4 9.52 248.2
1979 12.8 19.3 18.1 14.3 13.0 17.9 1,335 323.0 121.9 187.9 53.7 16.8 177.0
1980 18.7 60.1 33.7 21.6 23.8 67.7 496.5 58.4 33.9 12.9 10.4 29.8 71.7
1981 34.4 37.0 24.3 17.5 29.0 61.6 83.4 152.1 46.8 40.4 61.5 37.5 52.3
1982 79.4 72.3 33.2 13.3 14.4 237.9 714.5 152.2 55.5 77.9 27.0 17.7 124.5
1983 131.8 58.8 44.9 25.4 26.6 202.7 145.7 103.8 75.8 806.9 106.4 59.8 150.8
1984 77.6 71.0 46.0 28.8 61.1 617.9 534.9 126.1 564.1 55.2 13.3 10.8 183.3
1985 150.9 70.4 41.5 26.0 20.7 343.2 174.8 644.0 624.0 146.9 97.0 140.7 207.7
1986 114.2 79.0 58.2 46.7 44.3 581.2 1,364 908.9 436.2 152.4 58.0 200.8 337.4
1987 135.3 116.1 80.1 53.5 55.7 554.0 228.6 154.4 65.7 35.2 35.9 27.0 129.3
1988 30.8 45.8 38.1 23.3 22.5 263.3 274.9 80.9 29.4 8.18 13.3 14.1 70.4
1989 17.2 23.9 22.0 21.0 19.7 49.9 1,359 134.7 56.0 17.2 17.6 93.8 151.2
1990 36.3 32.2 19.7 20.4 23.6 106.0 217.4 141.8 135.8 37.2 11.0 10.9 66.0
1991 22.9 46.4 25.9 14.7 19.1 82.8 138.3 260.5 110.7 150.1 19.6 17.1 76.1
1992 25.5 35.0 33.1 30.8 38.2 171.1 105.2 75.3 180.1 152.1 33.0 52.3 77.7
1993 32.7 55.9 35.9 25.5 27.0 125.3 632.6 149.5 257.4 1,495 910.5 158.7 328.5
1994 83.1 73.4 66.8 53.5 50.1 630.8 536.3 292.9 116.1 155.4 66.2 49.6 182.1
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