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Last update: Wednesday, 23-Feb-2005 09:45:53 EST
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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 1,350 1972 10.0 1935 178 210 1.18 4.72
November 1,230 1972 19.0 1935 134 155 1.15 3.56
December 260 1910 21.4 1937 85.6 49.1 0.57 2.27
January 220 1910 21.4 1940 68.0 34.7 0.51 1.80
February 150 1984 19.1 1937 62.8 29.3 0.47 1.67
March 993 1946 13.6 1937 225 252 1.12 5.97
April 3,460 1966 61.0 1981 1,120 870 0.78 29.8
May 5,060 1950 32.2 1977 663 723 1.09 17.6
June 3,040 1962 26.5 1980 481 508 1.06 12.8
July 1,670 1994 8.34 1936 367 386 1.05 9.74
August 1,690 1985 1.49 1936 204 279 1.36 5.42
September 1,270 1973 2.92 1936 179 195 1.09 4.75
Annual 855 1950 64.4 1939 311 174 0.56 100
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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 27.8 25.0 24.9 75.0 75.9 46.8 27.4 21.9 18.8 25.0 30.6 25.4 27.6
90 31.8 31.0 33.0 119 116 64.1 44.7 32.8 29.4 36.0 39.7 37.4 37.1
85 36.9 34.5 38.6 156 142 80.2 58.5 40.7 37.3 44.5 46.7 42.7 43.6
80 39.9 36.8 43.4 191 169 96.1 71.4 49.5 44.4 51.5 52.2 46.7 50.2
75 42.4 39.2 48.0 239 196 115 84.2 58.2 53.8 57.6 59.4 50.5 58.2
70 45.8 42.6 52.8 310 225 138 97.1 66.5 63.4 65.3 67.0 54.2 66.9
65 49.0 45.8 57.8 382 259 161 112 74.7 73.0 74.9 73.9 57.6 75.8
60 51.4 48.9 62.9 449 300 184 128 83.6 82.7 83.2 80.9 61.2 85.1
55 56.4 53.0 70.0 529 337 216 149 93.0 93.3 91.2 88.2 67.5 94.5
50 62.5 58.0 77.2 640 382 249 170 102 104 102 95.5 74.6 104
45 67.5 64.1 86.3 765 438 287 206 114 115 113 106 82.0 122
40 73.5 68.3 95.5 907 497 333 245 130 130 127 116 87.3 140
35 78.0 72.4 106 1,090 583 391 285 147 144 141 129 92.7 170
30 82.3 77.0 118 1,310 688 475 339 169 164 166 142 101 204
25 86.5 81.7 144 1,530 814 572 410 195 192 201 159 109 266
20 90.6 89.6 184 1,790 982 688 512 231 236 244 177 118 358
15 97.5 97.4 298 2,140 1,170 841 661 298 309 303 202 127 506
10 107 104 587 2,720 1,450 1,080 898 448 437 393 243 141 770
5 126 121 1,190 3,820 2,080 1,660 1,380 835 630 576 321 187 1,340
__________________________________________________________________________________________________________________________
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Probability of occurrence of annual high discharges
[ng, statistic not given]
__________________________________________________________________________________________________
Maximum mean 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 1.01 480 416 363 270 197
0.95 1.05 860 714 615 472 347
0.90 1.11 1,160 947 810 629 466
0.80 1.25 1,640 1,330 1,130 882 657
0.50 2 3,070 2,480 2,080 1,640 1,230
0.20 5 5,510 4,540 3,770 2,960 2,230
0.10 10 7,340 6,170 5,100 3,970 3,000
0.04 25 9,830 8,510 7,010 5,380 4,060
0.02 50 11,800 10,400 6,570 6,510 4,910
0.01 100 13,800 12,500 10,300 7,700 5,810
0.005 200 15,900 14,700 12,100 8,960 6,740
0.002 500 18,800 ng ng ng ng
__________________________________________________________________________________________________
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Probability of occurrence of annual low discharges
____________________________________________________________________________________
Minimum mean 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 1.80 4.49 5.87 6.77 8.54 12.9 17.5 22.4 28.4
0.10 10 4.90 9.47 12.0 13.5 16.3 21.4 25.4 29.8 36.7
0.20 5 12.7 19.1 23.0 25.3 29.5 34.5 37.2 40.9 49.5
0.50 2 38.4 42.3 46.1 49.2 54.1 59.7 63.1 67.4 84.6
____________________________________________________________________________________
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Probability of occurrence of seasonal low discharges
_____________________________________________________________________________________
Minimum mean 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 8.16 17.7 19.9 22.9 10.3 18.8 20.6 25.5
0.10 10 13.2 22.7 24.8 27.7 16.5 24.3 26.4 34.0
0.20 5 21.9 30.1 31.9 34.7 26.8 32.5 35.4 48.6
0.50 2 46.7 48.9 50.1 52.8 53.9 54.9 59.9 100
June-July-August September-October-November
_________________________ _________________________
0.05 20 2.84 8.16 9.81 13.4 3.59 7.24 8.62 16.2
0.10 10 7.43 15.0 17.4 22.9 8.93 15.5 18.1 24.8
0.20 5 19.0 28.1 31.8 41.0 21.4 32.0 36.7 141.0
0.50 2 62.0 69.0 76.9 101 60.8 74.2 83.0 188.0
_____________________________________________________________________________________
1Graphical interpretation.
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Annual peak discharge and corresponding gage height
[--, 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
1910 March 22 9.50 1,960 1961 April 26 3.97 884
1911 June 9 7.92 793 1962 June 10 10.96 8,600
1912 September 29 -- 1,110 1963 July 13 6.15 2,300
1913 April 8 -- 3,320 1964 April 17 6.58 3,050
1914 June 12 4.70 1,340 1965 April 13 10.86 8,680
1915 June 29 6.91 3,320 1966 April 3 11.02 8,920
1916 April 15 -- 3,990 1967 March 31 9.32 5,820
1917 April 11 -- 1,250 1968 July 18 7.30 3,550
1919 -- -- 6,700 1969 April 12 11.82 9,740
1935 March 27 5.02 696 1970 April 26 9.32 5,630
1936 April 17 -- 1,260 1971 April 10 7.58 3,500
1937 May 1 -- 1,010 1972 April 16 9.95 6,720
1938 May 14 5.95 2,220 1973 March 15 7.42 2,900
1939 April 20 3.80 830 1974 April 22 10.08 6,920
1940 April 15 11.43 3,100 1975 April 19 10.34 7,310
1941 June 8 -- 3,290 1976 April 3 6.84 3,120
1942 March 27 10.04 2,200 1977 July 5 4.13 866
1943 April 7 -- 2,780 1978 April 9 11.56 9,890
1944 August 10 7.42 3,210 1979 April 25 12.38 10,300
1945 March 27 -- 2,680 1980 April 8 5.59 1,910
1946 March 22 -- 3,380 1981 September 8 6.97 3,160
1947 April 15 -- 5,430 1982 April 15 7.76 4,160
1948 April 7 -- 3,000 1983 June 13 7.05 3,190
1949 June 2 7.30 3,360 1984 June 9 8.85 5,450
1950 May 6 11.28 9,310 1985 August 19 9.86 7,120
1951 April 10 6.52 2,880 1986 April 30 7.39 3,720
1952 April 16 6.17 2,550 1987 May 27 5.93 2,170
1953 July 5 4.44 1,120 1988 April 7 6.05 2,270
1954 April 14 6.16 2,540 1989 April 7 7.62 2,550
1955 April 8 7.25 3,660 1990 June 22 3.77 652
1956 April 21 8.67 5,560 1991 September 16 4.45 1,040
1957 June 28 9.98 6,840 1992 August 25 -- 1,640
1958 July 7 4.65 1,320 1993 March 30 9.88 3,200
1959 April 4 6.30 1,960 1994 July 8 8.99 5,350
1960 April 6 8.47 4,010
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 25 12.38 10,300 1975 April 19 10.34 7,310
1978 April 9 11.56 9,890 1985 August 19 9.86 7,120
1969 April 12 11.82 9,740 1974 April 22 10.08 6,920
1950 May 6 11.28 9,310 1957 June 28 9.98 6,840
1966 April 3 11.02 8,920 1919 -- 6,700
1965 April 13 10.86 8,680 1967 March 31 9.32 5,820
1962 June 10 10.96 8,600 1970 April 26 9.32 5,630
1956 April 21 8.67 5,560 1945 March 27 -- 2,680
1984 June 9 8.85 5,450 1952 April 16 6.17 2,550
1947 April 15 -- 5,430 1989 April 7 7.62 2,550
1994 July 8 8.99 5,350 1954 April 14 6.16 2,540
1982 April 15 7.76 4,160 1963 July 13 6.15 2,300
1960 April 6 8.47 4,010 1988 April 7 6.05 2,270
1916 April 15 -- 3,990 1938 May 14 5.95 2,220
1986 April 30 7.39 3,720 1942 March 27 10.04 2,200
1955 April 8 7.25 3,660 1987 May 27 5.93 2,170
1968 July 18 7.30 3,550 1910 March 22 9.50 1,960
1971 April 10 7.58 3,500 1959 April 4 6.30 1,960
1946 March 22 -- 3,380 1992 August 25 -- 1,640
1949 June 2 7.30 3,360 1914 June 12 4.70 1,340
1913 April 8 -- 3,320 1958 July 7 4.65 1,320
1915 June 29 6.91 3,320 1936 April 17 -- 1,260
1941 June 8 -- 3,290 1917 April 11 -- 1,250
1944 August 10 7.42 3,210 1953 July 5 4.44 1,120
1993 March 30 9.88 3,200 1912 September 29 -- 1,110
1983 June 13 7.05 3,190 1991 September 16 4.45 1,040
1981 September 8 6.97 3,160 1937 May 1 -- 1,010
1976 April 3 6.84 3,120 1961 April 26 3.97 884
1940 April 15 11.43 3,100 1977 July 5 4.13 866
1964 April 17 6.58 3,050 1939 April 20 3.80 830
1948 April 7 -- 3,000 1911 June 9 7.92 793
1973 March 15 7.42 2,900 1935 March 27 5.02 696
1951 April 10 6.52 2,880 1990 June 22 3.77 652
1943 April 7 -- 2,780
_____________________________________________________________________________________
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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
__________________________________________________________________________________________________________________________________
1909 -- -- -- -- -- -- -- -- -- 509.8 1,189 387.4 --
1910 382.0 280.2 260.0 220.0 115.0 646.6 1,304 323.7 118.1 31.9 33.5 38.5 313.1
1911 43.1 48.0 50.0 45.0 45.0 55.0 236.6 91.6 180.5 26.1 67.9 60.3 78.8
1912 80.0 75.5 65.0 30.0 35.0 38.0 317.0 240.7 108.5 135.9 69.4 337.1 127.3
1913 365.4 79.9 60.0 34.9 28.9 32.6 1,291 300.7 120.3 100.0 84.7 87.8 215.1
1914 125.4 97.0 64.5 55.2 71.7 75.5 306.9 540.5 862.7 613.4 177.5 198.3 266.2
1915 177.3 141.2 57.1 50.0 50.0 60.0 674.7 493.4 988.5 1,368 155.2 99.9 360.9
1916 120.0 91.5 78.5 68.4 76.0 64.0 2,099 1,395 785.1 607.0 133.4 137.1 470.1
1917 106.5 62.4 57.1 70.0 70.0 108.5 625.4 213.5 85.7 66.6 58.0 70.1 132.5
1935 10.0 19.0 22.8 31.7 33.6 160.4 255.0 191.4 89.2 51.6 26.7 45.0 78.1
1936 29.8 27.2 26.8 29.1 24.2 23.3 539.5 348.7 67.8 8.34 1.49 2.92 93.8
1937 18.0 24.5 21.4 24.5 19.1 13.6 249.2 344.9 207.0 97.9 116.8 180.1 109.9
1938 102.9 59.3 28.2 32.5 42.6 185.3 164.4 1,277 309.2 115.5 28.8 22.2 199.3
1939 24.9 32.6 30.9 34.8 24.4 20.0 274.9 172.6 59.9 39.2 17.4 42.3 64.4
1940 54.0 48.0 39.6 21.4 25.3 32.6 855.5 497.6 93.1 27.1 13.4 20.7 143.5
1941 29.8 50.4 57.2 51.8 38.7 29.7 1,029 313.5 1,038 231.6 111.3 430.8 282.5
1942 537.0 224.6 74.8 34.5 32.4 460.0 754.6 830.0 107.4 53.2 94.5 590.3 317.3
1943 310.6 108.8 59.9 48.6 45.9 79.4 1,561 868.3 1,293 355.7 210.6 125.4 421.5
1944 98.0 101.3 68.7 38.8 47.2 42.5 284.5 438.0 631.1 391.5 847.6 414.8 284.2
1945 332.5 350.1 213.1 65.3 51.6 979.1 1,737 850.0 268.0 133.1 101.8 266.7 446.7
1946 321.9 143.9 105.5 80.2 60.2 993.2 1,263 462.1 258.2 263.5 47.2 60.6 339.6
1947 187.2 154.7 92.7 71.8 52.2 94.2 2,346 1,609 1,850 499.2 130.0 132.1 600.5
1948 156.3 107.3 79.2 53.4 29.9 61.5 1,946 731.5 104.5 137.5 75.9 44.2 292.6
1949 39.5 50.6 42.1 41.4 38.1 46.6 563.2 377.5 1,154 608.5 778.1 293.4 336.6
1950 158.5 167.7 99.5 67.4 57.5 58.9 2,262 5,059 1,013 906.9 214.1 119.1 854.7
1951 238.6 167.9 103.4 89.7 82.9 98.2 1,891 1,339 241.4 75.6 78.9 259.4 388.6
1952 179.4 139.3 119.5 108.7 97.4 142.7 1,454 450.3 226.1 822.9 152.9 78.0 330.6
1953 66.4 51.1 56.5 63.6 65.8 251.4 551.6 563.5 550.0 626.3 147.2 92.3 258.1
1954 81.3 87.5 87.9 79.2 88.3 134.9 1,118 505.5 326.2 94.9 72.5 72.5 228.3
1955 72.2 69.8 58.1 46.8 39.3 48.0 1,108 257.6 367.2 114.7 41.8 25.5 186.4
1956 49.1 47.9 51.9 49.5 47.7 48.5 1,318 754.4 253.1 74.8 71.5 182.3 244.5
1957 56.1 148.4 57.5 42.6 39.9 253.5 1,271 430.1 1,584 1,015 88.0 353.5 444.0
1958 214.8 258.1 83.8 61.6 54.3 106.9 145.8 133.3 245.3 469.0 48.2 35.2 155.3
1959 63.4 72.2 44.3 41.7 35.5 132.1 462.9 340.3 372.1 174.6 86.8 55.2 156.8
1960 70.9 54.1 54.3 43.4 37.6 53.5 741.1 280.1 520.4 179.4 41.9 64.2 177.4
1961 45.5 77.8 52.3 32.6 26.9 158.3 406.2 370.4 73.8 42.1 28.5 103.6 118.4
1962 100.4 72.7 47.7 43.9 41.8 46.7 1,112 2,459 3,042 1,613 316.4 245.1 763.8
1963 128.7 155.0 118.4 52.3 30.0 181.4 649.4 389.7 644.8 352.2 78.4 52.0 236.2
1964 45.9 53.0 50.7 42.0 45.5 60.3 1,028 666.7 631.5 211.5 50.9 155.2 252.2
1965 194.9 114.0 64.8 56.4 47.7 53.5 2,778 1,231 1,437 296.1 97.9 194.9 545.0
1966 538.2 185.6 143.7 102.0 75.1 411.1 3,458 1,247 280.3 112.0 288.0 171.1 583.7
1967 108.5 107.0 83.8 81.1 73.4 354.4 2,024 1,025 567.4 183.0 55.9 34.7 390.9
1968 57.8 65.0 69.8 63.0 64.8 526.8 420.4 262.3 485.8 819.8 265.5 126.0 270.0
1969 141.6 108.0 86.5 76.0 75.6 95.4 2,487 853.9 464.7 175.9 164.5 100.4 400.9
1970 291.1 224.0 136.0 134.8 97.7 76.0 2,115 1,352 786.0 159.1 54.3 56.1 456.1
1971 121.1 230.5 119.7 101.8 60.7 119.8 1,160 327.1 212.8 136.5 123.8 184.6 240.8
1972 1,350 1,233 185.1 103.5 103.3 818.5 2,336 995.0 269.8 169.6 292.0 141.5 666.0
1973 152.5 165.5 90.3 70.7 62.1 898.0 254.8 148.9 67.3 56.2 219.0 1,267 287.9
1974 804.0 235.2 128.1 97.6 120.0 118.8 2,542 1,601 475.7 84.2 341.9 103.1 554.8
1975 117.2 153.3 110.4 108.7 101.4 124.2 2,640 1,215 469.8 1,402 190.5 110.2 562.6
1976 112.3 135.1 96.9 89.8 97.2 253.0 974.6 102.6 81.5 121.1 113.0 15.5 181.9
1977 27.7 41.4 38.3 36.2 36.1 79.8 108.0 32.2 77.5 238.1 75.9 274.2 88.8
1978 325.3 275.2 246.5 165.5 125.5 113.4 3,233 302.0 200.0 256.7 175.8 136.2 460.2
1979 65.1 56.3 54.3 52.2 85.2 85.8 2,905 845.4 468.7 778.1 429.2 107.8 493.5
1980 72.6 200.1 116.4 94.5 103.4 110.5 730.0 68.4 26.5 104.7 116.8 108.9 153.4
1981 80.9 87.5 59.9 50.3 55.5 62.7 61.0 71.2 379.4 545.8 369.0 621.4 204.0
1982 -- -- -- -- -- 351.0 2,089 1,178 288.6 455.6 159.0 47.3 --
1983 418.5 145.5 117.3 99.8 90.1 864.8 589.4 315.5 818.7 461.4 374.6 260.8 381.3
1984 285.9 175.6 126.3 91.1 149.7 447.7 555.3 212.1 1,007 167.9 92.4 23.7 276.8
1985 376.8 251.4 141.5 84.2 65.2 588.9 596.0 1,134 605.0 918.0 1,686 471.4 581.8
1986 454.3 208.9 164.3 125.7 125.2 591.5 1,747 1,252 254.2 241.3 138.1 102.8 451.7
1987 100.8 101.4 104.0 83.7 75.0 440.4 204.1 533.0 228.6 491.3 314.9 128.3 235.9
1988 89.8 89.7 77.9 89.9 94.0 330.5 727.8 137.5 75.5 89.5 95.6 63.1 163.0
1989 62.8 59.8 71.9 88.2 74.5 81.4 1,349 343.7 264.3 172.5 76.8 77.0 225.7
1990 44.8 35.4 25.5 35.4 41.9 105.6 217.1 133.9 297.8 116.9 70.2 25.5 95.8
1991 27.3 32.5 35.6 35.5 33.8 77.5 94.9 167.0 90.3 488.2 133.5 284.7 125.8
1992 82.1 92.1 89.5 73.6 69.1 445.9 361.6 243.2 90.6 322.1 363.5 507.6 228.9
1993 104.5 93.8 87.8 83.0 83.0 408.9 844.0 247.2 360.0 841.4 833.8 278.1 357.3
1994 100.5 99.4 121.7 86.2 72.6 196.9 497.7 564.1 711.8 1,673 299.8 339.4 399.4
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