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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 6,020 1995 28.7 1937 1,540 1,280 0.83 3.54
November 5,160 1972 23.8 1937 1,370 1,060 0.77 3.14
December 2,940 1995 33.5 1937 1,000 738 0.74 2.31
January 2,050 1951 7.05 1937 827 594 0.72 1.90
February 2,090 1997 1.21 1937 790 552 0.70 1.82
March 15,300 1995 2.25 1937 2,230 2,540 1.14 5.14
April 48,900 1997 1,280 1938 13,400 10,100 0.75 30.8
May 72,800 1950 663 1934 9,300 12,400 1.34 21.4
June 25,400 1962 196 1934 5,100 4,570 0.89 11.7
July 28,000 1975 121 1936 4,160 4,450 1.07 9.56
August 27,000 1993 46.6 1934 2,100 3,130 1.49 4.83
September 10,000 1993 23.8 1934 1,640 1,600 0.97 3.78
Annual 12,800 1997 333 1934 3,630 2,610 0.72 100
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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 56.4 53.0 164 1,030 1,050 586 296 130 80.0 86.7 116 66.7 148
90 155 165 265 1,650 1,430 926 482 247 213 249 276 187 270
85 184 214 354 2,070 1,730 1,290 701 370 333 352 349 236 393
80 235 261 433 2,660 2,100 1,530 946 472 444 430 463 301 518
75 310 325 523 3,210 2,450 1,800 1,190 598 547 532 568 389 648
70 397 388 625 3,810 2,730 2,120 1,470 763 681 660 684 521 783
65 452 453 727 4,650 3,030 2,360 1,780 929 831 786 785 603 934
60 515 521 829 5,660 3,430 2,630 2,090 1,080 959 901 870 665 1,100
55 594 604 942 6,770 3,820 2,950 2,420 1,230 1,080 1,000 970 722 1,270
50 718 691 1,070 8,010 4,220 3,340 2,780 1,370 1,200 1,190 1,080 822 1,470
45 825 773 1,200 9,740 4,760 3,810 3,170 1,530 1,340 1,350 1,250 928 1,670
40 909 856 1,370 11,800 5,430 4,370 3,550 1,720 1,500 1,500 1,400 1,030 1,940
35 1,000 954 1,560 14,200 6,360 5,020 3,940 1,930 1,690 1,680 1,540 1,140 2,240
30 1,130 1,050 1,750 17,000 7,660 5,720 4,440 2,210 1,910 1,860 1,710 1,280 2,600
25 1,270 1,190 2,000 20,000 9,430 6,530 5,040 2,540 2,160 2,060 1,910 1,460 3,220
20 1,410 1,360 2,240 23,400 12,100 7,610 5,780 2,890 2,450 2,350 2,130 1,690 4,090
15 1,560 1,510 2,870 27,300 16,500 9,120 6,990 3,460 2,790 2,850 2,400 1,920 5,410
10 1,760 1,650 4,980 31,700 24,900 11,300 9,370 4,150 3,280 3,540 2,720 2,160 8,260
5 1,960 1,820 10,100 40,700 36,900 15,800 13,600 5,410 4,510 4,360 3,450 2,390 15,900
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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)1
__________________________________________________________________________________________________
0.99 1.01 3,380 2,990 2,700 2,190 1,670
0.95 1.05 5,730 5,410 4,970 4,080 3,080
0.90 1.11 7,580 7,340 6,810 5,640 4,240
0.80 1.25 10,600 10,500 9,860 8,270 6,230
0.50 2 20,200 220,000 19,400 16,800 12,900
0.20 5 38,300 38,000 36,800 33,000 26,200
0.10 10 53,300 51,900 50,600 46,400 37,800
0.04 25 75,800 71,600 70,300 66,100 55,700
0.02 50 95,000 87,600 86,400 82,600 71,300
0.01 100 116,000 105,000 104,000 101,000 89,000
0.005 200 140,000 123,000 122,000 120,000 109,000
0.002 500 175,000 ng ng ng ng
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1From U.S. Army Corps of Engineers.
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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)1 year (feet) (ft3/s)
_____________________________________________________________________________________
Annual peak discharge, by year, and corresponding gage height
21861 -- 95.00 -- 1954 April 17 -- 11,500
21882 -- 90.00 -- 1955 April 10 72.25 24,000
21897 -- 91.00 -- 1956 April 27 81.02 33,800
1913 April 11 74.52 25,600 1957 July 4 65.37 15,300
1914 June 19 58.36 7,260 1958 July 12 57.17 7,940
1915 July 9 69.06 20,100 1959 April 10 -- 15,700
1916 April 24 85.74 46,200 1960 April 13 77.65 30,500
1917 April 12 -- 25,900 1961 March 31 57.26 4,320
1918 April 3 -- 4,990 1962 April 25 81.93 33,400
1919 July 12 -- 13,400 1963 April 13 64.14 13,800
1920 April 16 -- 26,700 1964 June 25 66.82 17,500
1921 April 15 -- 12,800 1965 April 26 85.19 46,200
1922 April 14 69.40 18,900 1966 April 11 89.15 66,800
1923 April 25 74.98 26,000 1967 April 9 80.79 33,600
1924 April 28 57.25 6,320 1968 July 24 64.12 13,900
1925 June 21 -- 17,500 1969 April 26 87.52 54,700
1926 April 1 61.02 8,000 1970 April 29 84.67 39,600
1927 May 16 71.58 20,500 1971 April 16 -- 26,600
1928 April 6 67.91 16,800 1972 April 24 78.16 30,700
1929 April 1 -- 19,200 1973 March 27 -- 14,700
1930 April 10 72.51 20,800 1974 April 28 86.51 43,500
1931 April 10 59.29 7,940 1975 May 8 84.32 42,800
1932 April 15 71.64 18,900 1976 April 6 79.06 32,900
1933 April 9 -- 11,000 1977 April 10 53.75 4,590
1934 April 13 -- 4,800 1978 April 18 86.89 50,600
1935 April 3 59.65 5,470 1979 May 1 91.19 92,700
1936 April 21 68.16 18,000 1980 April 10 73.54 21,700
1937 May 7 56.55 5,840 1981 July 4 55.19 6,150
1938 May 20 -- 7,530 1982 April 18 81.15 34,000
1939 April 10 60.77 6,700 1983 April 9 77.29 25,800
1940 April 21 66.84 14,600 1984 April 8 -- 30,200
1941 April 16 76.94 27,800 1985 March 29 -- 16,700
1942 April 10 78.77 27,900 1986 April 7 -- 34,200
1943 April 20 77.54 29,500 1987 April 9 -- 37,400
1944 April 19 66.82 12,300 1988 April 8 64.89 15,700
1945 April 4 -- 29,400 1989 April 23 84.30 42,700
1946 April 5 -- 24,100 1990 April 10 60.90 5,510
1947 April 28 76.07 28,400 1991 July 12 56.15 5,690
1948 April 27 87.62 51,800 1992 April 4 74.19 15,800
1949 April 15 77.13 29,200 1993 August 16 79.02 31,900
1950 May 13 90.89 95,500 1994 April 9 75.90 26,900
1951 April 15 74.55 26,600 1995 April 2 84.80 42,400
1952 April 24 -- 24,200 1996 April 26 89.10 66,700
1953 June 28 63.70 14,500 1997 April 26 92.41 133,000
Annual peak discharge, from highest to lowest, and corresponding gage height
1997 April 26 92.41 133,000 1930 April 10 72.51 20,800
1950 May 13 90.89 95,500 1927 May 16 71.58 20,500
1979 May 1 91.19 92,700 1915 July 9 69.06 20,100
1966 April 11 89.15 66,800 1929 April 1 -- 19,200
1996 April 26 89.10 66,700 1922 April 14 69.40 18,900
1969 April 26 87.52 54,700 1932 April 15 71.64 18,900
1948 April 27 87.62 51,800 1936 April 21 68.16 18,000
1978 April 18 86.89 50,600 1925 June 21 -- 17,500
1916 April 24 85.74 46,200 1964 June 25 66.82 17,500
1965 April 26 85.19 46,200 1928 April 6 67.91 16,800
1974 April 28 86.51 43,500 1985 March 29 -- 16,700
1975 May 8 84.32 42,800 1992 April 4 74.19 15,800
1989 April 23 84.30 42,700 1959 April 10 -- 15,700
1995 April 2 84.80 42,400 1988 April 8 64.89 15,700
1970 April 29 84.67 39,600 1957 July 4 65.37 15,300
1987 April 9 -- 37,400 1973 March 27 -- 14,700
1986 April 7 -- 34,200 1940 April 21 66.84 14,600
1982 April 18 81.15 34,000 1953 June 28 63.70 14,500
1956 April 27 81.02 33,800 1968 July 24 64.12 13,900
1967 April 9 80.79 33,600 1963 April 13 64.14 13,800
1962 April 25 81.93 33,400 1919 July 12 -- 13,400
1976 April 6 79.06 32,900 1921 April 15 -- 12,800
1993 August 16 79.02 31,900 1944 April 19 66.82 12,300
1972 April 24 78.16 30,700 1954 April 17 -- 11,500
1960 April 13 77.65 30,500 1933 April 9 -- 11,000
1984 April 8 -- 30,200 1926 April 1 61.02 8,000
1943 April 20 77.54 29,500 1931 April 10 59.29 7,940
1945 April 4 -- 29,400 1958 July 12 57.17 7,940
1949 April 15 77.13 29,200 1938 May 20 -- 7,530
1947 April 28 76.07 28,400 1914 June 19 58.36 7,260
1942 April 10 78.77 27,900 1939 April 10 60.77 6,700
1941 April 16 76.94 27,800 1924 April 28 57.25 6,320
1994 April 9 75.90 26,900 1981 July 4 55.19 6,150
1920 April 16 -- 26,700 1937 May 7 56.55 5,840
1951 April 15 74.55 26,600 1991 July 12 56.15 5,690
1971 April 16 -- 26,600 1990 April 10 60.90 5,510
1923 April 25 74.98 26,000 1935 April 3 59.65 5,470
1917 April 12 -- 25,900 1918 April 3 -- 4,990
1983 April 9 77.29 25,800 1934 April 13 -- 4,800
1913 April 11 74.52 25,600 1977 April 10 53.75 4,590
1952 April 24 -- 24,200 1961 March 31 57.26 4,320
1946 April 5 -- 24,100 21861 -- 95.00 --
1955 April 10 72.25 24,000 21882 -- 90.00 --
1980 April 10 73.54 21,700 21897 -- 91.00 --
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1Datum is 700 feet Geodetic Survey of Canada Datum of 1929.
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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]
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Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1912 -- -- -- -- -- -- -- -- 1,754 1,209 1,052 1,140 --
1913 2,280 1,407 786.5 498.7 301.8 399.0 13,360 3,180 1,756 1,338 956.7 1,210 2,282
1914 1,188 1,353 990.3 536.0 500.7 788.5 4,147 3,246 4,414 3,488 1,379 1,334 1,949
1915 1,378 1,395 1,006 894.2 867.7 992.7 5,100 3,743 5,020 13,150 2,947 1,797 3,208
1916 1,816 1,602 1,146 896.2 789.3 921.1 28,940 20,740 7,936 10,740 5,107 4,220 7,066
1917 3,211 2,804 1,996 1,258 1,043 1,138 14,000 5,783 2,585 1,467 643.8 465.4 3,028
1918 678.9 900.5 566.8 238.4 221.6 1,072 2,428 1,810 2,296 991.0 729.8 665.6 1,051
1919 408.6 675.3 577.3 469.8 423.5 594.7 7,721 3,961 2,148 7,789 3,645 1525 2,506
1920 1,165 798.7 726.5 812.3 903.1 2,926 18,360 4,216 4,863 3,358 1,543 1,134 3,382
1921 1,210 1,241 1,015 811.2 782.1 1,140 6,393 2,610 2,762 1,782 880.8 839.0 1,786
1922 836.3 721.6 659.9 467.1 379.1 1,977 12,740 8,011 3,375 1,494 640.7 597.8 2,658
1923 500.3 730.1 375.5 305.2 327.1 396.2 10,120 7,735 2,014 2,457 816.0 598.7 2,201
1924 609.6 611.1 400.4 225.3 237.1 306.3 2,832 3,089 1,342 897.3 406.8 356.1 942.9
1925 707.0 529.1 208.8 140.8 185.3 1,073 4,830 1,649 10,540 3,399 519.2 559.1 2,021
1926 936.1 888.8 656.8 466.9 518.9 1,688 5,316 1,344 2,574 2,107 486.5 451.6 1,451
1927 973.4 816.0 493.3 416.5 390.5 3,996 13,400 14,670 8,721 3,312 1,592 1,484 4,199
1928 1,369 1,102 803.8 602.7 670.6 1,951 7,582 2,848 3,295 4,534 1,920 2,457 2,425
1929 1,823 1,600 1,092 1,050 884.1 5,880 6,780 2,650 1,696 754.1 423.2 322.8 2,084
1930 453.5 479.5 294.1 200.1 179.2 2,893 8,703 5,164 1,923 1,063 362.9 215.4 1,830
1931 231.7 267.3 235.9 176.0 199.6 959.6 3,385 881.0 660.1 356.4 157.5 81.0 631.0
1932 84.8 220.5 187.0 166.5 138.0 1,364 7,809 1,925 586.0 256.1 62.5 40.0 1,063
1933 46.0 121.4 89.0 54.0 49.4 861.9 5,839 1,548 1,026 253.4 73.1 45.9 830.2
1934 48.8 84.8 46.0 54.3 32.5 491.8 2,178 662.6 196.1 138.2 46.6 23.6 333.0
1935 47.0 77.2 41.7 14.0 26.9 749.0 3,325 1,173 438.2 1,082 514.1 268.7 647.3
1936 116.8 77.8 59.2 56.8 54.0 58.2 6,739 2,602 583.3 120.6 79.3 66.8 878.3
1937 28.6 23.7 33.3 7.05 1.21 2.25 2,025 2,886 1,059 830.4 1,565 818.3 777.4
1938 401.7 280.8 72.5 53.3 75.9 1,453 1,282 4,870 2,584 854.8 217.5 193.4 1,035
1939 199.8 207.2 181.9 197.6 255.4 259.9 3,717 1,193 658.7 565.8 187.5 230.3 651.8
1940 357.0 384.5 278.0 135.3 148.2 224.2 5,085 2,232 1,053 357.2 255.1 186.8 886.8
1941 236.1 392.4 296.0 312.0 348.0 361.7 13,650 3,120 5,284 1,426 755.4 1,853 2,320
1942 3,065 1,389 887.5 565.1 635.1 1,962 16,530 8,966 4,187 1,809 1,254 3,110 3,694
1943 1,643 1,135 775.0 797.7 699.7 1,207 23,130 7,258 12,440 6,497 2,584 1,818 4,984
1944 1,473 1,432 926.1 662.6 736.1 767.8 4,349 3,776 6,947 6,806 6,003 5,909 3,315
1945 2,906 4,026 2,733 1,294 1,365 9,121 20,150 8,646 4,043 2,187 1,309 1,776 4,965
1946 1,975 1,398 988.1 944.9 790.9 5,738 14,640 4,119 2,223 2,442 1,273 1,167 3,142
1947 1,661 1,617 1,169 1,031 897.2 1,057 17,830 11,940 12,050 5,785 2,029 1,571 4,882
1948 1,865 1,653 1,346 1,084 844.6 851.0 24,890 20,050 3,858 3,139 1,661 1,009 5,182
1949 673.7 711.9 556.5 449.0 453.9 596.5 14,720 5,092 6,070 3,414 3,289 1,806 3,146
1950 1,146 1,387 1,066 827.3 747.9 926.8 26,540 72,820 22,300 10,110 3,805 2,617 12,100
1951 3,330 2,073 2,160 2,053 1,800 2,287 19,650 10,860 4,941 2,742 1,461 1,955 4,605
1952 1,581 1,413 1,906 1,788 1,914 2,009 17,150 7,663 3,815 5,878 2,285 1,376 4,056
1953 945.3 863.9 697.9 609.6 610.6 1,365 4,064 3,151 8,890 5,531 2,301 1,317 2,531
1954 892.9 961.2 935.6 834.4 847.3 1,376 5,823 4,230 4,283 2,958 1,436 895.4 2,124
1955 816.1 828.9 717.8 731.7 652.1 653.5 10,600 3,226 4,286 2,741 1,815 941.9 2,328
1956 941.9 604.1 449.8 431.5 455.4 509.3 12,750 14,560 5,427 4,092 1,156 2,028 3,617
1957 682.2 1,325 613.7 442.7 407.6 1,445 5,882 4,537 4,202 9,284 2,880 6,388 3,183
1958 3,776 3,381 1,714 1,383 1,305 1,867 3,330 1,648 1,424 4,055 1,005 458.9 2,118
1959 430.0 488.6 358.1 348.2 342.6 632.7 6049 2,110 2,747 2,067 758.6 543.9 1,404
1960 563.7 587.6 627.5 617.8 556.6 471.0 16,530 5,206 3,110 2,283 589.4 619.2 2,630
1961 341.9 555.3 379.2 344.7 292.7 1,721 2,592 2,400 1,111 441.4 274.5 266.7 895.7
1962 593.9 410.8 262.5 197.8 199.9 225.1 14,750 12,010 25,430 16,060 7,212 3,368 6,734
1963 2,450 2,177 1,636 1,246 1,074 1,515 7,847 3,739 7,490 3,049 1,315 1,213 2,891
1964 1,395 966.3 696.8 767.1 754.5 685.7 8,474 5,455 9,511 3,625 1,321 671.8 2,849
1965 1,701 1,390 910.0 909.8 890.4 950.2 24,980 18,580 10,030 5,632 2,345 2,096 5,867
1966 4,417 3,337 2,760 1,879 1,648 5,841 45,820 20,250 7,007 4,752 3,785 2,894 8,690
1967 1,992 2,132 1,824 1,632 1,477 2,086 25,420 20,000 6,548 3,588 1,487 951.1 5,763
1968 905.8 963.3 672.9 491.5 493.4 1,434 4,883 2,502 6,037 6,866 3,292 2,994 2,628
1969 2,204 2,143 1,956 1,696 1,613 2,173 29,160 27,410 6,454 4,023 2,076 1,656 6,891
1970 2,084 2,043 1,571 1,454 1,411 1,578 19,180 22,960 16,950 5,515 1,614 1,400 6,484
1971 1,282 1,667 1,094 1,033 998.7 1,960 14,470 5,486 3,252 2,909 1,462 1,499 3,086
1972 4,021 5,163 2,681 1,963 1,598 6,832 23,910 10,890 6,367 2,482 2,479 2,058 5,855
1973 1,834 1,709 1,153 1,112 1,116 5,817 2707 1,716 1,311 622.0 779.5 2,567 1,874
1974 4,152 2,613 2,079 1,713 1,688 2,022 19,340 29,660 10,760 3,744 3,262 2,051 6,948
1975 1,937 2,141 1,358 1,314 1,412 1,651 12,950 27,310 6,923 28,020 4,713 2,560 7,760
1976 2,429 2,409 1,564 1,523 1,643 2,794 17,430 4,398 2,375 1,554 1,119 728.1 3,313
1977 387.3 313.7 176.9 180.4 189.8 400.2 2,101 1,202 861.5 636.0 260.7 533.7 603.2
1978 1,423 1,126 1,293 1,226 987.4 1,737 36,030 10,240 3,870 3,615 1,730 1,118 5,345
1979 957.7 872.4 646.8 562.3 578.9 774.6 26,080 49,220 8,093 6,432 3,371 2,227 8,370
1980 1,750 1,955 1,526 1,351 1,331 1,479 10,140 2,399 1,630 860.9 484.5 837.0 2,133
1981 550.6 656.9 358.6 292.1 296.4 1,471 1,807 1,386 1,582 2,737 1,517 1,808 1,210
1982 2,402 1,963 1,104 1,151 1,055 1,754 22,080 8,865 4,261 4,090 2,465 1,346 4,372
1983 4,332 2,535 1,935 1,614 1,377 9,361 12,530 3,948 4,835 6,393 2,500 2,794 4,526
1984 2,138 2,107 1,723 1,380 1,274 2,896 19,140 4,253 11,580 3,399 1,531 959.1 4,337
1985 1,850 1,862 1,444 1,207 1,154 6,461 7,385 9,120 7,935 7,374 7,342 5,858 4,938
1986 4,533 2,808 2,098 2,014 1,812 6,091 26,820 22,310 7,367 5,014 2,845 2,917 7,233
1987 3,596 2,084 1,983 1,804 1,616 6,895 22,500 4,242 3,682 3,109 2,612 1,109 4,597
1988 831.1 838.2 702.9 471.3 510.2 2,258 6,623 1,444 1,088 463.5 281.7 332.3 1,315
1989 337.3 309.9 256.6 262.9 379.8 396.8 21,480 6,886 2,692 1,138 430.9 1,045 2,952
1990 451.3 375.1 258.0 172.5 261.1 1,147 3,531 1,661 2,178 1,191 464.8 365.8 1,004
1991 298.6 314.6 232.1 177.1 245.6 594.4 2,097 2,821 2,306 3,971 1,295 1,578 1,334
1992 861.3 888.0 572.4 552.0 553.0 7,055 10,130 4,510 2,509 2,976 1,276 2,617 2,875
1993 1,213 852.0 930.8 858.4 1,016 1,310 15,000 4,136 4,630 10,530 27,000 10,010 6,489
1994 4,231 2,786 2,048 1,495 1,503 5,415 17,570 7,549 6,099 13,320 4,416 4,772 5,950
1995 6,015 5,033 2,945 1,958 1,781 15,340 33,550 14,280 6,050 8,323 3,792 2,719 8,500
1996 3,458 3,215 2,285 1,889 1,795 3,777 28,910 41,370 14,870 4,721 3,101 1,786 9,274
1997 1,891 2,381 2,185 1,974 2,087 2,307 48,890 54,650 10,810 18,890 4,297 2,952 12,830
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