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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 1994 24.6 1957 71.2 44.2 0.62 2.92
November 232 1980 22.7 1956 82.2 51.0 0.62 3.37
December 247 1994 17.6 1956 75.3 51.1 0.68 3.09
January 170 1987 17.5 1991 69.3 42.5 0.61 2.85
February 221 1976 26.6 1991 77.8 48.9 0.63 3.19
March 1,260 1987 35.1 1956 277 284 1.02 11.4
April 2,460 1969 71.7 1991 673 567 0.84 27.6
May 3,050 1950 53.6 1990 410 567 1.38 16.8
June 1,940 1950 48.4 1961 254 297 1.17 10.4
July 1,470 1975 26.7 1988 228 312 1.37 9.34
August 2,230 1993 22.5 1977 134 329 2.46 5.49
September 483 1993 25.1 1959 83.8 98.6 1.18 3.44
Annual 633 1950 48.0 1991 203 137 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 22.2 27.1 33.3 71.6 56.5 51.2 28.8 20.7 23.3 25.9 27.5 21.3 27.2
90 27.2 31.2 44.7 89.5 64.6 59.4 36.5 24.8 28.3 30.5 32.9 31.0 33.5
85 33.2 35.1 52.3 108 71.1 65.9 44.3 28.6 30.4 35.1 37.9 35.8 38.3
80 36.0 38.7 60.4 128 79.6 73.0 51.9 31.9 32.6 38.8 41.1 39.8 43.2
75 39.3 42.7 69.4 152 90.2 81.2 59.0 35.0 35.0 41.4 43.7 43.5 48.6
70 44.1 46.2 81.1 172 101 91.9 65.9 38.2 37.4 43.9 46.2 46.2 53.6
65 48.0 48.7 95.0 202 114 105 73.1 41.5 40.2 46.5 49.7 48.8 58.4
60 50.0 51.4 108 248 131 123 80.5 45.0 43.4 49.2 54.1 50.9 64.0
55 51.9 55.9 124 304 160 137 90.5 48.6 47.3 51.8 58.9 53.0 69.8
50 55.2 60.5 140 390 209 154 103 52.3 51.1 54.4 63.5 56.1 78.4
45 58.9 65.2 153 461 243 175 118 56.4 54.9 58.1 68.0 59.1 90.8
40 63.4 71.9 172 552 281 200 135 62.0 59.6 62.0 72.8 62.8 105
35 69.0 78.8 212 683 320 226 155 69.0 65.4 65.8 80.4 67.1 121
30 73.5 90.4 259 814 367 259 179 81.2 74.2 74.1 90.9 80.7 142
25 88.6 98.7 303 951 448 304 223 99.9 82.9 84.7 107 99.0 170
20 105 109 362 1,130 528 352 299 125 93.7 98.5 121 116 217
15 122 118 443 1,340 617 398 380 170 107 116 138 133 298
10 144 141 583 1,680 854 487 478 232 134 133 160 150 436
5 166 188 1,170 2,170 1,450 672 676 354 286 189 200 181 794
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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 1.01 137 104 79.7 68.7 61.4
0.95 1.05 276 225 184 155 128
0.90 1.11 392 332 279 233 187
0.80 1.25 591 519 450 374 293
0.50 2 1,220 1,140 1,040 866 668
0.20 5 2,380 2,300 2,160 1,844 1,460
0.10 10 3,270 3,200 3,050 2,650 2,150
0.04 25 4,510 4,460 4,290 3,820 3,220
0.02 50 5,500 5,450 5,270 4,770 4,140
0.01 100 6,520 6,480 6,280 5,780 5,180
0.005 200 7,590 7,540 7,310 6,840 6,320
0.002 500 9,050 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 10.9 12.8 14.2 16.3 18.4 21.2 23.4 25.6 28.6
0.10 10 13.0 14.8 16.1 18.1 20.6 24.1 26.6 29.3 33.1
0.20 5 16.3 17.9 19.0 21.0 24.1 28.4 31.6 35.1 40.0
0.50 2 25.3 26.6 27.9 30.0 34.6 41.1 46.0 51.2 59.2
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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 13.3 16.0 18.0 20.8 24.3 26.3 28.7 41.4
0.10 10 16.7 19.9 22.1 25.0 29.2 31.8 34.9 51.8
0.20 5 22.2 26.0 28.2 31.4 36.8 40.6 45.1 68.9
0.50 2 37.9 43.1 45.8 49.3 59.4 68.2 78.1 125
June-July-August September-October-November
_________________________ __________________________
0.05 20 13.5 16.4 18.1 20.4 12.1 17.3 19.0 23.0
0.10 10 16.2 19.3 21.3 24.6 14.9 19.9 21.8 26.1
0.20 5 20.7 24.2 26.6 31.5 19.0 24.0 26.2 30.8
0.50 2 34.9 39.4 43.8 54.5 30.5 35.7 39.0 44.7
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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)
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Annual peak discharge, by year, and corresponding gage height
1947 -- 22.10 3,600 1972 March 19 13.54 1,530
1950 May 13 20.50 3,210 1973 March 22 6.19 710
1951 May 5 7.70 1,010 1974 April 29 12.29 1,940
1952 April 8 17.80 2,240 1975 July 6 21.66 4,640
1953 July 3 6.44 679 1976 April 16 8.75 925
1954 July 6 6.17 631 1977 May 8 6.05 570
1955 April 19 8.80 1,120 1978 March 28 16.43 1,410
1956 May 4 10.82 1,460 1979 May 7 20.75 4,160
1957 September 12 5.70 547 1980 April 4 7.92 750
1958 March 5 6.95 480 1981 April 10 4.77 435
1959 July 3 4.13 204 1982 April 16 12.84 2,040
1960 April 13 11.76 1,820 1983 April 21 17.64 2,060
1961 March 11 5.10 350 1984 April 11 11.51 1,810
1962 July 11 15.14 2,310 1985 March 18 7.06 555
1963 April 6 4.99 430 1986 April 24 11.13 1,740
1964 July 3 -- 600 1987 March 26 18.26 3,000
1965 April 18 17.30 2,760 1988 March 7 5.46 460
1966 April 3 19.15 3,380 1989 April 3 15.01 1,430
1967 April 18 10.48 1,460 1990 June 7 3.42 286
1968 June 18 7.67 1,010 1991 May 29 3.11 184
1969 April 15 21.03 4,690 1992 March 15 11.44 1,400
1970 April 27 9.59 1,230 1993 August 9 19.84 3,550
1971 April 30 11.46 1,750 1994 April 7 12.87 2,030
Annual peak discharge, from highest to lowest, and corresponding gage height
1969 April 15 21.03 4,690 1978 March 28 16.43 1,410
1975 July 6 21.66 4,640 1992 March 15 11.44 1,400
1979 May 7 20.75 4,160 1970 April 27 9.59 1,230
1947 -- 22.10 3,600 1955 April 19 8.80 1,120
1993 August 9 19.84 3,550 1951 May 5 7.70 1,010
1966 April 3 19.15 3,380 1968 June 18 7.67 1,010
1950 May 13 20.50 3,210 1976 April 16 8.75 925
1987 March 26 18.26 3,000 1980 April 4 7.92 750
1965 April 18 17.30 2,760 1973 March 22 6.19 710
1962 July 11 15.14 2,310 1953 July 3 6.44 679
1952 April 8 17.80 2,240 1954 July 6 6.17 631
1983 April 21 17.64 2,060 1964 July 3 -- 600
1982 April 16 12.84 2,040 1977 May 8 6.05 570
1994 April 7 12.87 2,030 1985 March 18 7.06 555
1974 April 29 12.29 1,940 1957 September 12 5.70 547
1960 April 13 11.76 1,820 1958 March 5 6.95 480
1984 April 11 11.51 1,810 1988 March 7 5.46 460
1971 April 30 11.46 1,750 1981 April 10 4.77 435
1986 April 24 11.13 1,740 1963 April 6 4.99 430
1972 March 19 13.54 1,530 1961 March 11 5.10 350
1967 April 18 10.48 1,460 1990 June 7 3.42 286
1956 May 4 10.82 1,460 1959 July 3 4.13 204
1989 April 3 15.01 1,430 1991 May 29 3.11 184
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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
__________________________________________________________________________________________________________________________________
1949 -- -- -- -- -- -- -- -- -- -- 93.4 32.0 --
1950 34.8 39.7 44.2 29.7 28.9 200.6 1,575 3,053 1,938 401.4 174.4 57.4 633.3
1951 51.0 64.1 47.6 50.0 50.0 87.3 682.7 530.5 184.4 127.0 59.0 71.2 167.1
1952 61.5 86.7 47.4 45.5 59.0 62.1 787.4 116.8 73.4 75.9 38.9 41.2 123.7
1953 42.8 43.5 35.5 34.7 45.6 128.3 99.3 138.9 288.7 267.8 59.9 33.0 101.8
1954 40.6 47.7 52.9 67.1 111.4 132.7 222.7 100.8 112.9 336.6 73.4 69.4 114.0
1955 67.4 108.7 107.7 80.8 49.3 71.0 350.8 107.3 272.3 291.7 110.7 26.1 137.1
1956 29.9 22.7 17.6 19.7 21.7 35.1 255.4 611.9 298.8 98.3 49.3 26.0 124.1
1957 24.6 47.6 59.2 55.6 57.7 112.8 116.9 88.4 98.8 93.9 74.1 324.7 96.0
1958 129.1 170.7 115.7 96.5 89.0 209.1 176.8 84.7 73.7 104.6 43.7 30.5 110.5
1959 38.3 42.8 38.8 41.1 33.8 66.0 97.4 53.7 59.3 62.1 33.1 25.1 49.3
1960 36.0 30.6 41.9 38.0 36.1 69.0 1,060 181.7 212.6 84.7 36.5 41.3 154.4
1961 34.7 47.1 58.5 61.9 61.2 143.5 78.9 73.0 48.4 30.0 25.2 30.5 57.8
1962 41.9 33.1 24.9 25.2 31.0 145.8 728.5 306.4 394.5 1,065 274.1 111.8 266.5
1963 88.7 95.5 101.8 66.0 58.0 121.0 209.1 117.1 134.0 56.7 45.6 38.1 94.3
1964 37.1 46.2 45.7 30.5 43.2 51.2 165.5 86.8 124.8 276.5 49.5 55.5 84.4
1965 53.3 76.9 58.7 60.6 62.0 76.9 1,508 475.1 270.2 202.2 261.2 99.3 266.3
1966 186.3 126.8 138.0 113.1 100.9 1,121 1,327 463.7 301.1 192.2 274.1 103.6 371.8
1967 66.1 49.9 87.6 91.5 87.5 420.3 915.8 743.9 224.2 81.2 38.4 34.7 237.2
1968 38.3 38.1 48.0 53.9 50.0 161.4 247.4 236.0 340.3 99.9 43.4 41.5 116.3
1969 46.0 70.7 60.8 63.0 179.5 262.9 2464 965.1 232.6 306.4 75.4 57.0 397.1
1970 55.7 61.4 67.9 62.3 87.7 217.6 592.3 422.1 520.3 166.4 51.5 41.5 195.2
1971 41.3 55.9 48.3 57.4 62.5 393.5 662.7 424.7 304.9 316.1 64.3 66.9 208.7
1972 99.1 135.8 164.5 165.2 108.8 446.6 963.0 468.3 364.8 121.5 75.0 54.4 263.5
1973 62.6 69.6 55.9 58.9 94.3 308.6 156.0 72.5 58.0 32.3 30.7 44.6 87.0
1974 50.9 50.4 50.1 49.9 123.6 309.8 937.7 845.3 680.1 73.3 54.2 34.8 271.2
1975 42.4 58.1 57.5 71.9 67.2 97.4 762.1 1,191 634.2 1,466 190.8 113.7 398.8
1976 102.3 115.2 114.9 115.9 221.4 315.4 625.3 281.9 97.6 60.0 35.0 36.9 176.1
1977 38.4 45.2 41.2 38.0 41.6 109.7 103.7 102.2 56.9 39.9 22.5 40.9 56.8
1978 57.6 60.0 58.6 52.9 100.8 415.7 879.6 275.3 144.2 94.9 42.1 123.5 191.7
1979 81.5 86.8 49.4 44.6 51.2 148.6 1,817 2,306 355.8 218.0 153.4 81.3 451.3
1980 78.8 231.5 65.8 42.6 42.7 193.4 380.8 61.5 88.3 59.8 44.9 142.7 118.8
1981 132.3 140.7 69.0 36.9 49.4 120.3 210.7 105.4 133.1 178.2 57.7 35.7 106.0
1982 160.1 193.8 38.6 27.2 31.5 144.8 1,255 371.3 240.0 190.0 111.1 32.9 232.5
1983 134.7 182.1 164.5 138.6 86.0 1165 931.4 287.0 266.6 311.9 45.2 103.7 319.4
1984 102.3 148.8 152.9 138.2 96.3 397.9 1,203 456.3 207.7 84.6 29.5 54.9 255.2
1985 115.0 85.8 64.8 58.5 38.2 212.7 224.6 206.8 143.6 62.7 51.5 59.7 110.7
1986 58.2 76.6 142.5 163.4 187.5 512.2 647.1 688.9 167.2 113.4 132.6 90.5 248.9
1987 86.5 105.7 205.5 170.1 115.9 1,256 1,796 303.6 226.1 93.6 313.7 85.7 397.2
1988 110.7 120.7 127.4 125.0 140.2 277.4 113.8 68.8 52.8 26.7 17.5 29.4 100.9
1989 34.4 37.1 33.6 37.6 54.7 174.7 711.9 86.0 74.7 38.0 35.5 42.7 112.8
1990 54.2 55.3 33.3 24.9 32.7 91.8 107.0 53.6 95.3 40.6 26.6 55.5 55.9
1991 47.2 31.7 18.5 17.5 26.6 65.5 71.7 85.8 69.1 65.1 30.1 45.7 48.0
1992 31.0 32.5 51.9 59.7 61.5 545.6 201.2 84.0 90.2 124.1 73.8 83.2 120.4
1993 54.6 48.8 31.9 73.7 106.8 253.4 681.9 221.3 316.6 1,250 2,231 483.2 483.6
1994 224.5 180.1 246.6 164.8 214.5 614.4 1203 460.3 374.3 759.8 252.7 467.3 430.6
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