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Post-regulation period, 1950-97
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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 714 1995 18.5 1992 91.0 105 1.16 3.15
November 674 1995 18.9 1977 101 103 1.02 3.51
December 359 1995 9.15 1977 88.8 74.2 0.84 3.07
January 267 1997 8.40 1977 78.7 56.7 0.72 2.72
February 287 1996 16.4 1977 89.3 64.8 0.73 3.09
March 1,180 1995 34.0 1956 286 295 1.03 9.90
April 3,310 1997 65.2 1991 828 742 0.90 28.7
May 3,240 1997 54.0 1959 536 695 1.30 18.6
June 1,780 1950 40.2 1977 291 287 0.99 10.0
July 1,360 1975 26.8 1988 257 314 1.22 8.89
August 2,220 1993 21.1 1988 151 320 2.12 5.23
September 532 1993 7.43 1976 91.8 105 1.15 3.18
Annual 804 1997 44.5 1977 241 185 0.77 100
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Monthly and annual flow duration, in cubic feet per second, post-regulation period
______________________________________________________________________________________________________________________
Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
______________________________________________________________________________________________________________________
95 21.2 22.5 37.0 75.5 56.8 49.2 30.9 21.2 22.0 25.1 25.0 20.6 25.9
90 24.8 31.9 46.2 101 69.1 61.4 39.3 26.0 27.7 30.4 30.9 27.5 33.6
85 31.4 37.1 52.0 124 81.2 71.3 50.9 30.7 31.3 34.6 37.1 34.7 39.8
80 35.8 41.8 58.6 144 93.6 82.0 59.5 35.3 34.8 38.3 41.8 39.6 45.4
75 38.8 46.5 67.9 173 106 95.2 67.3 39.3 37.5 41.1 45.7 45.3 50.8
70 42.1 49.8 77.9 198 118 110 76.3 43.2 40.2 44.2 49.4 49.5 56.1
65 45.9 52.4 91.5 246 132 124 88.2 46.8 43.4 48.0 53.3 52.5 61.7
60 49.5 55.8 104 313 159 137 102 50.3 47.3 51.7 58.2 55.1 69.9
55 54.4 60.5 118 386 208 155 115 54.6 51.2 55.4 62.9 57.3 78.0
50 63.0 66.0 138 464 248 180 128 59.7 55.2 59.2 67.5 59.5 90.8
45 67.2 72.8 158 578 292 207 144 65.8 59.2 63.6 72.7 63.1 105
40 70.6 81.4 182 710 356 236 161 73.7 63.6 68.8 80.1 69.6 122
35 75.9 92.2 218 845 424 274 187 87.8 74.6 76.7 90.0 81.1 141
30 90.8 101 267 991 507 320 238 110 86.6 85.0 105 96.3 166
25 105 109 298 1,160 582 360 298 136 98.4 97.7 121 116 210
20 120 121 339 1,360 690 408 363 185 109 120 139 133 271
15 144 146 416 1,690 946 480 435 236 124 138 166 143 360
10 162 174 605 2,050 1,310 616 523 309 175 172 200 166 524
5 194 256 1,230 2,880 2,460 881 826 415 350 237 258 245 1,010
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Probability of annual high discharges, post-regulation period
[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 1.01 124 87.4 76.8 68.1 57.8
0.95 1.05 270 217 191 162 130
0.90 1.11 397 338 299 251 197
0.80 1.25 617 555 496 413 320
0.50 2 1,330 1,280 1,170 989 769
0.20 5 2,590 2,550 2,410 2,140 1,730
0.10 10 3,530 3,470 3,350 3,080 2,570
0.04 25 4,790 4,650 14,370 13,930 13,260
0.02 50 5,750 5,500 15,170 14,650 13,860
0.01 100 6,720 6,310 15,930 15,340 14,430
0.005 200 7,680 7,090 16,660 15,990 14,970
0.002 500 8,950 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)
_____________________________________________________________________________________
Annual peak discharge, by year, and corresponding gage height
1903 April 11 14.70 1,570 1962 July 13 18.77 2,420
1904 April 25 8.70 1,950 1963 April 8 8.63 490
1905 May 13 9.80 814 1964 July 6 8.99 542
1906 April 16 11.70 1,060 1965 April 24 -- 2,530
1919 April 28 16.80 2,220 1966 April 4 -- 3,110
1930 April 5 14.90 1,780 1967 April 21 14.92 1,830
1931 April 7 7.84 390 1968 June 20 11.46 1,020
1932 April 13 11.84 1,110 1969 April 22 21.20 3,060
1933 March 11 11.82 680 1970 June 2 14.83 1,120
1934 April 13 7.22 336 1971 May 1 14.63 1,800
1935 March 29 7.32 362 1972 March 20 18.28 1,560
1936 April 21 9.74 718 1973 March 17 13.14 500
1937 April 18 7.40 485 1974 April 29 16.36 2,060
1938 March 27 5.50 249 1975 July 3 21.75 2,850
1939 April 3 -- 600 1976 April 17 11.46 963
1940 April 18 7.88 555 1977 May 9 8.54 475
1941 April 26 12.72 1,340 1978 March 29 21.04 1,660
1942 April 27 11.02 1,040 1979 April 21 22.12 3,480
1943 April 7 -- 2,400 1980 April 8 11.55 825
1944 May 22 10.10 861 1981 April 11 7.99 460
1945 March 22 13.38 1,360 1982 April 17 17.12 2,040
1946 March 31 15.01 1,690 1983 March 22 19.82 2,100
1947 April 18 20.53 2,800 1984 April 12 15.60 2,070
1948 May 7 18.46 2,650 1985 May 23 8.84 608
1949 April 29 16.19 1,980 1986 April 25 14.97 1,720
1950 May 22 19.99 2,810 1987 March 29 20.35 2,940
1951 April 5 13.25 1,020 1988 March 10 9.28 450
1952 April 12 20.28 2,510 1989 April 4 20.53 1,420
1953 June 17 -- 1,300 1990 June 9 6.16 155
1954 July 7 9.11 565 1991 July 1 11.67 270
1955 April 21 11.68 1,110 1992 March 17 14.39 1,070
1956 May 8 13.01 1,450 1993 August 11 -- 3,250
1957 September 14 7.86 442 1994 March 30 -- 2,840
1958 March 7 8.84 470 1995 -- -- 3,830
1959 June 12 6.70 246 1996 May 2 -- 4,240
1960 April 14 14.75 1,720 1997 -- -- 4,810
1961 March 14 8.08 255
Annual peak discharge, from highest to lowest, and corresponding gage height
1997 -- -- 4,810 1969 April 22 21.20 3,060
1996 May 2 -- 4,240 1987 March 29 20.35 2,940
1995 -- -- 3,830 1975 July 3 21.75 2,850
1979 April 21 22.12 3,480 1994 March 30 -- 2,840
1993 August 11 -- 3,250 1950 May 22 19.99 2,810
1966 April 4 -- 3,110 1947 April 18 20.53 2,800
1948 May 7 18.46 2,650 1942 April 27 11.02 1,040
1965 April 24 -- 2,530 1951 April 5 13.25 1,020
1952 April 12 20.28 2,510 1968 June 20 11.46 1,020
1962 July 13 18.77 2,420 1976 April 17 11.46 963
1943 April 7 -- 2,400 1944 May 22 10.10 861
1919 April 28 16.80 2,220 1980 April 8 11.55 825
1983 March 22 19.82 2,100 1905 May 13 9.80 814
1984 April 12 15.60 2,070 1936 April 21 9.74 718
1974 April 29 16.36 2,060 1933 March 11 11.82 680
1982 April 17 17.12 2,040 1985 May 23 8.84 608
1949 April 29 16.19 1,980 1939 April 3 -- 600
1904 April 25 8.70 1,950 1954 July 7 9.11 565
1967 April 21 14.92 1,830 1940 April 18 7.88 555
1971 May 1 14.63 1,800 1964 July 6 8.99 542
1930 April 5 14.90 1,780 1973 March 17 13.14 500
1960 April 14 14.75 1,720 1963 April 8 8.63 490
1986 April 25 14.97 1,720 1937 April 18 7.40 485
1946 March 31 15.01 1,690 1977 May 9 8.54 475
1978 March 29 21.04 1,660 1958 March 7 8.84 470
1903 April 11 14.70 1,570 1981 April 11 7.99 460
1972 March 20 18.28 1,560 1988 March 10 9.28 450
1956 May 8 13.01 1,450 1957 September 14 7.86 442
1989 April 4 20.53 1,420 1931 April 7 7.84 390
1945 March 22 13.38 1,360 1935 March 29 7.32 362
1941 April 26 12.72 1,340 1934 April 13 7.22 336
1953 June 17 -- 1,300 1991 July 1 11.67 270
1970 June 2 14.83 1,120 1961 March 14 8.08 255
1932 April 13 11.84 1,110 1938 March 27 5.50 249
1955 April 21 11.68 1,110 1959 June 12 6.70 246
1992 March 17 14.39 1,070 1990 June 9 6.16 155
1906 April 16 11.70 1,060
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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
__________________________________________________________________________________________________________________________________
1903 -- -- -- -- -- -- -- 369.0 163.2 79.9 46.4 82.3 --
1904 77.4 80.0 60.0 40.0 40.0 87.1 1,332 1,043 420.4 216.6 88.0 85.1 296.9
1905 93.2 91.3 60.0 40.0 30.0 100.0 194.3 326.4 205.6 177.1 303.4 120.0 146.0
1906 79.7 -- -- -- -- _-- -- -- -- -- -- -- --
1919 -- -- -- -- -- -- 1,573 784.2 305.0 175.4 67.6 -- --
1930 32.8 33.3 20.0 17.4 61.7 838.4 675.6 269.1 123.9 47.8 26.9 23.7 181.5
1931 23.0 32.8 22.9 12.8 51.2 122.5 228.2 84.6 117.4 31.2 21.7 18.3 63.6
1932 20.7 39.6 34.5 25.5 20.8 223.8 551.1 143.9 128.2 59.5 30.4 21.1 107.9
1933 21.2 34.5 21.0 16.0 15.7 415.6 401.5 176.8 68.2 39.4 17.7 12.0 103.7
1934 11.9 17.2 13.4 10.0 13.6 65.1 200.7 56.2 25.2 14.7 9.64 8.95 37.1
1935 17.1 16.2 9.81 9.10 15.3 118.9 178.5 106.3 93.1 108.3 136.5 34.2 70.6
1936 26.5 18.1 19.5 16.1 14.7 53.1 308.5 200.1 55.0 22.7 7.46 8.37 62.4
1937 9.88 12.4 7.48 7.77 5.47 36.6 195.3 101.8 103.2 36.7 22.2 21.3 46.6
1938 13.5 16.5 11.3 12.0 12.9 93.7 116.3 70.8 39.4 19.3 41.1 16.8 38.8
1939 11.9 15.2 12.0 11.4 10.1 105.0 258.8 61.7 55.6 26.7 11.3 9.06 49.0
1940 12.4 17.2 15.2 6.37 5.70 6.76 210.1 121.4 44.1 14.8 11.0 8.66 39.3
1941 10.8 15.8 12.9 12.6 12.6 32.3 1,038 230.4 218.7 113.1 48.2 53.0 149.0
1942 73.7 65.4 51.3 24.2 22.6 46.4 664.3 405.7 298.3 109.9 77.2 109.2 162.2
1943 64.3 56.7 36.5 33.2 36.5 269.2 1,656 371.1 768.9 271.8 132.0 62.9 312.0
1944 40.9 59.3 42.0 27.4 31.8 39.0 222.2 261.5 250.7 182.4 164.9 185.4 125.6
1945 78.8 92.5 60.7 44.5 47.0 552.9 456.3 188.4 160.1 78.9 63.2 37.7 155.6
1946 37.1 37.8 26.5 28.8 25.3 332.5 687.5 151.4 114.9 88.6 74.2 42.0 137.3
1947 76.5 58.2 41.7 38.0 40.4 71.5 1,276 238.5 231.2 114.1 57.8 32.2 188.7
1948 34.1 64.8 47.5 32.3 30.0 39.6 1,450 1,628 272.2 149.9 103.4 54.5 325.7
1949 34.5 52.5 38.9 27.9 22.3 118.7 1,157 519.1 194.0 138.5 85.6 27.3 201.1
1950 33.3 42.3 45.1 29.4 27.5 130.7 1,542 2,654 1,785 444.0 189.0 61.9 583.5
1951 52.6 65.1 54.4 50.0 50.0 67.7 708.9 553.5 191.8 132.5 61.8 68.8 171.5
1952 62.8 92.3 55.2 45.5 57.9 68.0 970.5 124.8 74.8 223.8 43.5 40.1 153.9
1953 43.6 47.0 35.2 33.5 43.0 129.3 108.1 157.5 474.8 285.9 65.6 34.2 121.6
1954 42.6 54.7 58.8 72.9 111.7 143.9 240.1 116.8 100.3 341.6 81.4 71.3 119.8
1955 64.3 98.8 92.9 81.0 50.6 58.1 376.3 110.4 281.5 294.9 134.4 31.7 139.7
1956 38.0 24.6 19.4 18.9 18.3 34.0 271.7 617.4 304.7 123.7 53.5 28.7 129.7
1957 27.1 43.4 55.8 40.0 42.1 120.0 143.4 96.7 114.9 103.8 80.5 290.3 96.4
1958 136.8 171.3 130.6 110.6 95.4 200.9 194.5 97.6 78.4 131.3 58.7 39.1 120.6
1959 38.4 44.7 41.2 41.9 36.0 73.8 121.2 54.0 92.9 77.8 33.3 33.5 57.4
1960 35.6 27.9 42.7 40.2 43.4 58.4 1,072 191.1 206.9 85.3 35.7 46.2 155.7
1961 32.8 46.5 59.8 69.1 63.4 148.2 95.0 83.3 47.6 32.5 23.7 30.2 61.1
1962 44.7 32.8 25.3 24.4 35.3 65.4 773.2 318.2 419.2 1,097 273.9 103.3 268.9
1963 80.2 90.6 97.0 68.4 60.9 108.0 232.0 124.3 126.3 60.4 46.8 37.9 94.4
1964 35.8 45.8 46.3 31.7 49.5 55.6 197.9 97.5 106.8 281.2 56.3 57.9 88.6
1965 51.5 78.6 59.3 64.8 66.6 75.3 1,409 583.5 282.0 180.6 276.6 100.7 268.5
1966 194.0 142.3 141.6 118.2 100.4 887.2 1,485 523.4 329.8 216.6 276.7 107.7 377.7
1967 76.6 51.4 90.4 95.6 94.7 343.9 992.3 797.4 272.5 101.0 53.3 45.1 251.5
1968 35.5 42.0 52.6 55.6 57.8 162.7 273.5 220.6 343.4 115.3 46.9 47.3 120.8
1969 49.8 71.0 65.2 67.2 174.8 284.5 1,789 1,124 282.1 324.1 90.5 60.7 364.8
1970 63.9 62.5 62.3 69.4 86.6 197.3 632.0 504.6 598.3 204.7 58.3 40.6 214.8
1971 39.5 56.3 49.8 55.6 62.6 358.4 630.8 520.8 313.4 330.0 68.2 68.7 213.5
1972 86.1 131.3 168.0 152.0 108.5 409.5 1,017 512.9 443.2 114.0 83.2 54.8 272.8
1973 57.3 60.6 55.9 59.1 93.9 267.7 154.9 74.6 61.4 34.4 32.3 48.1 83.3
1974 57.2 51.8 59.5 41.7 123.1 313.3 944.5 860.5 747.0 103.8 63.5 43.1 283.6
1975 40.1 57.6 55.6 69.3 75.4 114.5 734.7 1,175 589.5 1,358 214.1 107.9 385.3
1976 103.0 115.1 111.0 107.7 210.7 329.7 658.4 331.0 108.2 61.4 29.7 7.43 180.5
1977 27.6 18.9 9.15 8.40 16.4 83.7 110.7 117.6 40.2 41.4 22.1 36.7 44.5
1978 60.2 58.6 59.7 46.4 92.0 425.3 1,102 315.2 144.2 104.0 47.5 121.7 214.2
1979 79.5 81.9 46.7 43.3 50.3 120.1 1,591 2,066 403.3 208.9 164.5 83.3 413.2
1980 72.6 240.8 68.2 45.4 50.1 147.2 437.5 65.9 90.1 64.8 43.8 138.7 121.3
1981 135.1 146.4 74.1 38.0 46.0 111.7 230.5 112.3 140.8 186.5 61.8 35.5 110.1
1982 162.1 188.7 39.5 24.2 31.2 134.8 1,267 388.4 250.9 191.3 117.1 37.1 235.5
1983 157.6 233.9 186.4 147.4 91.2 1,067 1,085 299.7 312.1 420.0 60.1 96.5 347.6
1984 124.6 195.5 141.2 141.0 113.2 275.2 1,385 549.7 263.0 94.2 29.1 47.4 278.7
1985 105.8 93.8 77.2 72.4 51.0 191.6 274.8 226.7 142.0 62.3 51.2 68.2 118.3
1986 64.4 73.6 144.5 161.1 167.1 486.4 719.7 776.2 190.2 139.2 153.6 115.8 266.7
1987 103.5 106.7 227.2 175.9 117.0 1,123 1,757 361.8 251.6 82.8 355.0 97.3 397.2
1988 118.6 123.0 136.2 130.2 144.5 278.7 152.1 91.4 65.4 26.8 21.1 27.4 109.6
1989 34.5 39.3 31.5 42.5 49.9 112.4 744.4 98.9 86.7 41.0 37.7 53.0 113.6
1990 58.1 72.4 31.1 22.3 25.9 69.0 91.2 54.2 80.7 43.0 22.1 51.4 51.7
1991 56.4 31.5 22.4 24.1 32.5 68.5 65.2 64.3 53.1 63.8 27.3 34.2 45.4
1992 18.5 27.7 57.7 69.9 69.2 505.9 223.2 110.2 104.9 106.2 56.5 59.7 117.9
1993 56.0 53.9 34.6 69.9 101.9 247.5 781.9 258.5 342.9 1,272 2,218 532.3 501.5
1994 245.5 160.1 225.2 166.1 222.7 691.6 1,376 479.5 386.1 1,058 310.6 495.1 485.5
1995 713.5 673.7 359.2 237.6 200.1 1,184 2,922 1,216 561.5 439.4 347.1 291.5 762.8
1996 224.2 172.2 131.1 131.1 287.1 891.3 2,371 2,222 646.6 304.3 340.1 123.1 653.8
1997 125.3 227.0 327.6 266.9 285.0 312.7 3,312 3,235 617.1 523.1 244.8 152.2 803.7
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