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Last update: Tuesday, 24-Aug-2004 12:38:25 EDT
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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 693 1995 24.6 1957 86.9 100 1.15 3.07
November 588 1995 22.7 1956 95.8 89.1 0.93 3.39
December 339 1995 17.6 1956 84.8 66.0 0.78 3.00
January 205 1995 17.5 1991 75.8 49.1 0.65 2.68
February 317 1996 21.7 1956 87.9 63.2 0.72 3.11
March 1,260 1987 35.1 1956 309 319 1.03 10.9
April 3,960 1997 71.7 1991 834 844 1.01 29.5
May 3,050 1950 53.6 1990 515 708 1.37 18.2
June 1,940 1950 48.4 1961 274 298 1.09 9.70
July 1,470 1975 26.7 1988 238 305 1.28 8.41
August 2,230 1993 17.5 1988 141 317 2.26 4.97
September 483 1993 25.1 1959 87.3 98.6 1.13 3.09
Annual 770 1997 48.0 1991 236 185 0.78 100
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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 22.7 28.2 34.0 73.0 57.6 52.0 29.3 21.1 23.7 26.4 28.2 21.5 27.3
90 27.6 31.5 45.7 93.2 65.2 60.4 37.5 25.6 28.5 31.3 33.6 31.4 33.7
85 34.3 35.5 53.9 112 72.9 67.1 45.9 29.5 30.7 36.0 38.7 36.0 39.4
80 36.5 39.8 62.6 133 82.5 75.1 53.8 33.0 32.9 39.5 42.0 41.1 44.7
75 39.6 44.0 72.8 156 94.3 84.8 61.3 36.3 35.3 42.1 45.2 44.2 49.5
70 45.7 47.8 87.3 182 107 97.1 68.7 39.7 37.8 44.7 48.2 46.7 54.6
65 49.1 50.7 101 220 123 113 76.5 43.3 40.8 47.4 51.4 49.3 60.3
60 51.4 54.9 116 277 144 131 85.7 47.0 44.5 50.3 56.7 51.9 66.8
55 54.4 59.8 132 354 192 146 97.0 50.9 48.6 53.4 61.7 55.1 74.9
50 58.5 63.8 147 431 230 167 113 54.8 52.8 56.7 66.6 58.8 85.9
45 62.4 69.6 160 530 269 192 130 60.5 57.4 61.0 72.4 62.8 99.7
40 67.5 79.9 193 661 312 217 151 66.7 62.4 66.0 78.6 67.0 116
35 73.3 89.3 227 787 367 248 176 78.6 71.5 73.2 88.7 76.1 134
30 88.5 98.9 273 928 446 288 216 96.3 79.7 81.0 107 97.4 158
25 102 111 324 1,100 534 334 273 120 89.6 93.8 119 114 193
20 119 122 392 1,330 624 379 345 156 101 109 134 126 247
15 141 144 487 1,640 889 448 406 208 114 128 153 143 339
10 165 185 712 2,070 1,240 548 500 283 158 162 180 162 496
5 181 220 1,410 3,320 2,270 827 669 378 311 218 229 216 962
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Probability of annual high discharges
[ng, statistic not given]
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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 1.01 136 104 80.2 68.9 61.0
0.95 1.05 280 230 189 158 130
0.90 1.11 404 344 290 241 193
0.80 1.25 620 547 475 395 309
0.50 2 1,340 1,250 1,140 954 740
0.20 5 2,710 12,620 2,480 2,140 1,720
0.10 10 3,820 3,740 3,590 3,180 2,640
0.04 25 5,410 5,360 5,200 4,750 4,120
0.02 50 6,710 6,670 6,510 6,080 5,470
0.01 100 8,090 8,060 7,900 7,530 7,030
0.005 200 9,550 9,520 9,360 9,110 8,830
0.002 500 11,600 ng ng ng ng
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1Statistical 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)
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Annual peak discharge, by year, and corresponding gage height
1947 -- 22.10 3,600 1974 April 29 12.29 1,940
1950 May 13 20.50 3,210 1975 July 6 21.66 4,640
1951 May 5 7.70 1,010 1976 April 16 8.75 925
1952 April 8 17.80 2,240 1977 May 8 6.05 570
1953 July 3 6.44 679 1978 March 28 16.43 1,410
1954 July 6 6.17 631 1979 May 7 20.75 4,160
1955 April 19 8.80 1,120 1980 April 4 7.92 750
1956 May 4 10.82 1,460 1981 April 10 4.77 435
1957 September 12 5.70 547 1982 April 16 12.84 2,040
1958 March 5 6.95 480 1983 April 21 17.64 2,060
1959 July 3 4.13 204 1984 April 11 11.51 1,810
1960 April 13 11.76 1,820 1985 March 18 7.06 555
1961 March 11 5.10 350 1986 April 24 11.13 1,740
1962 July 11 15.14 2,310 1987 March 26 18.26 3,000
1963 April 6 4.99 430 1988 March 7 5.46 460
1964 July 3 -- 600 1989 April 3 15.01 1,430
1965 April 18 17.30 2,760 1990 June 7 3.42 286
1966 April 3 19.15 3,380 1991 May 29 3.11 184
1967 April 18 10.48 1,460 1992 March 15 11.44 1,400
1968 June 18 7.67 1,010 1993 August 9 19.84 3,550
1969 April 15 21.03 4,690 1994 April 7 12.87 2,030
1970 April 27 9.59 1,230 1995 April 10 19.86 3,970
1971 April 30 11.46 1,750 1996 April 30 -- 5,100
1972 March 19 13.54 1,530 1997 April 27 -- 5,970
1973 March 22 6.19 710
Annual peak discharge, from highest to lowest, and corresponding gage height
1997 April 27 -- 5,970 1986 April 24 11.13 1,740
1996 April 30 -- 5,100 1972 March 19 13.54 1,530
1969 April 15 21.03 4,690 1967 April 18 10.48 1,460
1975 July 6 21.66 4,640 1956 May 4 10.82 1,460
1979 May 7 20.75 4,160 1989 April 3 15.01 1,430
1995 April 10 19.86 3,970 1978 March 28 16.43 1,410
1947 -- 22.10 3,600 1992 March 15 11.44 1,400
1993 August 9 19.84 3,550 1970 April 27 9.59 1,230
1966 April 3 19.15 3,380 1955 April 19 8.80 1,120
1950 May 13 20.50 3,210 1951 May 5 7.70 1,010
1987 March 26 18.26 3,000 1968 June 18 7.67 1,010
1965 April 18 17.30 2,760 1976 April 16 8.75 925
1962 July 11 15.14 2,310 1980 April 4 7.92 750
1952 April 8 17.80 2,240 1973 March 22 6.19 710
1983 April 21 17.64 2,060 1953 July 3 6.44 679
1982 April 16 12.84 2,040 1954 July 6 6.17 631
1994 April 7 12.87 2,030 1964 July 3 -- 600
1974 April 29 12.29 1,940 1977 May 8 6.05 570
1960 April 13 11.76 1,820 1985 March 18 7.06 555
1984 April 11 11.51 1,810 1957 September 12 5.70 547
1971 April 30 11.46 1,750 1958 March 5 6.95 480
1988 March 7 5.46 460 1990 June 7 3.42 286
1981 April 10 4.77 435 1959 July 3 4.13 204
1963 April 6 4.99 430 1991 May 29 3.11 184
1961 March 11 5.10 350
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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 1,165 931.4 287.0 266.6 311.9 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
1995 692.6 588.5 338.8 204.8 196.9 1,182 2,964 1,197 511.0 426.6 331.1 275.2 743.1
1996 181.6 143.9 119.0 126.4 316.9 965.0 2,799 2,171 684.4 296.4 268.8 89.4 679.4
1997 91.0 169.7 226.8 188.4 204.2 210.0 3,957 2,907 533.7 453.0 179.5 113.9 769.6
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