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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 4,530 1986 28.6 1937 1,460 1,190 0.81 3.59
November 5,160 1972 23.7 1937 1,290 967 0.75 3.17
December 2,760 1966 33.3 1937 949 691 0.73 2.34
January 2,050 1951 7.05 1937 786 564 0.72 1.94
February 1,910 1952 1.21 1937 749 518 0.69 1.85
March 9,360 1983 2.25 1937 2,060 2,130 1.03 5.06
April 45,800 1966 1,280 1938 12,600 9,070 0.72 30.9
May 72,800 1950 663 1934 8,300 11,000 1.32 20.4
June 25,400 1962 196 1934 4,910 4,470 0.91 12.1
July 28,000 1975 121 1936 3,920 4,190 1.07 9.66
August 27,000 1993 46.6 1934 2,040 3,170 1.55 5.02
September 10,000 1993 23.6 1934 1,610 1,620 1.00 3.97
Annual 12,100 1950 333 1934 3,390 2,300 0.68 100
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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 56.2 50.0 162 986 1,030 574 289 122 77.1 81.1 112 65.4 142
90 148 158 260 1,570 1,410 886 471 242 208 233 263 183 256
85 182 207 344 2,050 1,700 1,270 679 360 321 343 342 228 376
80 230 254 426 2,580 2,050 1,490 905 458 431 419 448 293 488
75 300 314 502 3,150 2,400 1,750 1,150 575 527 505 550 369 620
70 386 378 597 3,660 2,660 2,070 1,400 728 644 628 658 491 753
65 453 442 700 4,470 2,950 2,300 1,710 889 799 747 764 583 888
60 522 504 797 5,430 3,310 2,550 2,000 1,040 926 858 846 649 1,040
55 599 578 893 6,400 3,680 2,850 2,310 1,180 1,040 977 938 704 1,210
50 686 657 999 7,660 4,040 3,200 2,650 1,320 1,160 1,110 1,040 782 1,390
45 774 738 1,150 9,190 4,500 3,620 3,020 1,460 1,290 1,290 1,180 888 1,620
40 863 818 1,300 11,100 5,060 4,140 3,400 1,640 1,430 1,450 1,340 986 1,840
35 967 908 1,480 13,500 5,840 4,770 3,800 1,820 1,620 1,610 1,470 1,090 2,140
30 1,080 999 1,670 16,200 6,970 5,450 4,270 2,080 1,840 1,760 1,630 1,200 2,530
25 1,200 1,120 1,890 19,100 8,220 6,220 4,810 2,380 2,090 1,940 1,800 1,370 3,060
20 1,340 1,290 2,190 22,400 10,500 7,210 5,500 2,730 2,380 2,240 2,010 1,560 3,830
15 1,480 1,430 2,660 26,000 14,200 8,820 6,550 3,270 2,730 2,650 2,240 1,780 5,170
10 1,640 1,560 4,460 30,000 21,100 10,900 8,650 4,010 3,250 3,360 2,550 2,010 7,680
5 1,860 1,690 9,580 38,900 31,400 15,400 12,700 5,370 4,560 4,150 3,140 2,300 14,800
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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 3,040 2,890 2,630 2,150 1,670
0.95 1.05 5,530 5,330 4,900 4,030 3,050
0.90 1.11 7,500 7,260 6,720 5,560 4,180
0.80 1.25 10,700 10,400 9,710 8,110 6,090
0.50 2 20,100 19,700 18,800 16,100 12,300
0.20 5 35,900 35,400 34,300 30,700 24,200
0.10 10 47,500 46,900 45,900 42,100 34,200
0.04 25 63,200 62,400 61,700 58,400 49,200
0.02 50 75,300 74,400 74,000 71,600 61,900
0.01 100 87,700 86,600 86,700 85,700 76,000
0.005 200 100,000 99,000 99,700 100,000 91,500
0.002 500 118,000 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 27.6 29.4 31.6 33.8 37.5 43.8 57.5 80.1 97.9
0.10 10 66.0 69.8 74.3 78.8 87.4 101 118 147 179
0.20 5 159 167 175 185 204 231 248 280 340
0.50 2 520 535 554 582 627 685 696 729 886
_________________________________________________________________________________________
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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 34.2 35.9 38.0 41.2 53.9 59.0 63.1 115
0.10 10 82.0 85.6 89.6 96.6 126 138 146 261
0.20 5 197 204 211 225 288 314 332 583
0.50 2 621 638 653 684 784 839 918 1,600
June-July-August September-October-November
___________________________ ____________________________
0.05 20 90.9 104 115 146 59.2 66.1 71.9 85.8
0.10 10 167 187 204 253 113 126 137 163
0.20 5 324 352 382 462 224 249 273 321
0.50 2 918 968 1,050 1,240 640 704 773 890
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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)1 (ft3/s) year (feet)1 (ft3/s)
_______________________________________________________________________________________
Annual peak discharge, by year, and corresponding gage height
21861-- 95.00 -- 1953 June 28 63.70 14,500
21882-- 90.00 -- 1954 April 17 -- 11,500
21897-- 91.00 -- 1955 April 10 72.25 24,000
1913 April 11 74.52 25,600 1956 April 27 81.02 33,800
1914 June 19 58.36 7,260 1957 July 4 65.37 15,300
1915 July 9 69.06 20,100 1958 July 12 57.17 7,940
1916 April 24 85.74 46,200 1959 April 10 -- 15,700
1917 April 12 -- 25,900 1960 April 13 77.65 30,500
1918 April 3 -- 4,990 1961 March 31 57.26 4,320
1919 July 12 -- 13,400 1962 April 25 81.93 33,400
1920 April 16 -- 26,700 1963 April 13 64.14 13,800
1921 April 15 -- 12,800 1964 June 25 66.82 17,500
1922 April 14 69.40 18,900 1965 April 26 85.19 46,200
1923 April 25 74.98 26,000 1966 April 11 89.15 66,800
1924 April 28 57.25 6,320 1967 April 9 80.79 33,600
1925 June 21 -- 17,500 1968 July 24 64.12 13,900
1926 April 1 61.02 8,000 1969 April 26 87.52 54,700
1927 May 16 71.58 20,500 1970 April 29 84.67 39,600
1928 April 6 67.91 16,800 1971 April 16 -- 26,600
1929 April 1 -- 19,200 1972 April 24 78.16 30,700
1930 April 10 72.51 20,800 1973 March 27 -- 14,700
1931 April 10 59.29 7,940 1974 April 28 86.51 43,500
1932 April 15 71.64 18,900 1975 May 8 84.32 42,800
1933 April 9 -- 11,000 1976 April 6 79.06 32,900
1934 April 13 -- 4,800 1977 April 10 53.75 4,590
1935 April 3 59.65 5,470 1978 April 18 86.89 50,600
1936 April 21 68.16 18,000 1979 May 1 91.19 92,700
1937 May 7 56.55 5,840 1980 April 10 73.54 21,700
1938 May 20 -- 7,530 1981 July 4 55.19 6,150
1939 April 10 60.77 6,700 1982 April 18 81.15 34,000
1940 April 21 66.84 14,600 1983 April 9 77.29 25,800
1941 April 16 76.94 27,800 1984 April 8 -- 30,200
1942 April 10 78.77 27,900 1985 March 29 -- 16,700
1943 April 20 77.54 29,500 1986 April 7 -- 34,200
1944 April 19 66.82 12,300 1987 April 9 -- 37,400
1945 April 4 -- 29,400 1988 April 8 64.89 15,700
1946 April 5 -- 24,100 1989 April 23 84.30 42,700
1947 April 28 76.07 28,400 1990 April 10 60.90 5,510
1948 April 27 87.62 51,800 1991 July 12 56.15 5,690
1949 April 15 77.13 29,200 1992 April 4 74.19 15,800
1950 May 13 90.89 95,500 1993 August 16 79.02 31,900
1951 April 15 74.55 26,600 1994 April 9 75.90 26,900
1952 April 24 -- 24,200
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 May 13 90.89 95,500 1915 July 9 69.06 20,100
1979 May 1 91.19 92,700 1929 April 1 -- 19,200
1966 April 11 89.15 66,800 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
1970 April 29 84.67 39,600 1988 April 8 64.89 15,700
1987 April 9 -- 37,400 1957 July 4 65.37 15,300
1986 April 7 -- 34,200 1973 March 27 -- 14,700
1982 April 18 81.15 34,000 1940 April 21 66.84 14,600
1956 April 27 81.02 33,800 1953 June 28 63.70 14,500
1967 April 9 80.79 33,600 1968 July 24 64.12 13,900
1962 April 25 81.93 33,400 1963 April 13 64.14 13,800
1976 April 6 79.06 32,900 1919 July 12 -- 13,400
1993 August 16 79.02 31,900 1921 April 15 -- 12,800
1972 April 24 78.16 30,700 1944 April 19 66.82 12,300
1960 April 13 77.65 30,500 1954 April 17 -- 11,500
1984 April 8 -- 30,200 1933 April 9 -- 11,000
1943 April 20 77.54 29,500 1926 April 1 61.02 8,000
1945 April 4 -- 29,400 1931 April 10 59.29 7,940
1949 April 15 77.13 29,200 1958 July 12 57.17 7,940
1947 April 28 76.07 28,400 1938 May 20 -- 7,530
1942 April 10 78.77 27,900 1914 June 19 58.36 7,260
1941 April 16 76.94 27,800 1939 April 10 60.77 6,700
1994 April 9 75.90 26,900 1924 April 28 57.25 6,320
1920 April 16 -- 26,700 1981 July 4 55.19 6,150
1951 April 15 74.55 26,600 1937 May 7 56.55 5,840
1971 April 16 -- 26,600 1991 July 12 56.15 5,690
1923 April 25 74.98 26,000 1990 April 10 60.90 5,510
1917 April 12 -- 25,900 1935 April 3 59.65 5,470
1983 April 9 77.29 25,800 1918 April 3 -- 4,990
1913 April 11 74.52 25,600 1934 April 13 -- 4,800
1952 April 24 -- 24,200 1977 April 10 53.75 4,590
1946 April 5 -- 24,100 1961 March 31 57.26 4,320
1955 April 10 72.25 24,000 21861 -- 95.00 --
1980 April 10 73.54 21,700 21882 -- 90.00 --
1930 April 10 72.51 20,800 21897 -- 91.00 --
1927 May 16 71.58 20,500
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1Datum is 700 feet Geodetic Survey of Canada Datum of 1929.2Data source unknown. Not used in statistics.
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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
__________________________________________________________________________________________________________________________________
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
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