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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 5,190 1995 13.8 1937 1,800 1,350 0.75 3.82
November 5,650 1972 277 1977 1,570 1,070 0.68 3.32
December 3,070 1972 149 1977 1,250 756 0.60 2.65
January 2,060 1966 174 1990 1,100 612 0.56 2.32
February 1,980 1996 201 1977 1,060 558 0.52 2.25
March 15,700 1995 280 1962 2,940 2,990 1.02 6.23
April 54,700 1997 1,280 1981 14,500 11,100 0.77 30.7
May 58,900 1950 938 1977 8,930 10,600 1.19 18.9
June 23,400 1962 399 1936 5,180 4,170 0.80 11.0
July 28,200 1975 118 1936 4,670 4,760 1.02 9.89
August 21,600 1993 50.1 1936 2,400 3,120 1.30 5.07
September 7,910 1993 27.4 1936 1,820 1,440 0.79 3.85
Annual 11,300 1997 536 1977 4,060 2,510 0.62 100
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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
_______________________________________________________________________________________________________________________________________
95 197 226 361 1,160 1,150 787 430 251 290 310 350 228 338
90 279 326 486 1,670 1,500 1,140 720 415 473 391 437 312 469
85 366 388 598 2,120 1,760 1,490 1,140 577 558 478 516 394 611
80 435 461 688 2,540 2,150 1,790 1,500 794 681 582 610 489 759
75 531 541 839 3,080 2,490 2,030 1,800 938 814 722 694 595 920
70 618 605 1,010 3,890 2,800 2,290 2,080 1,040 930 832 771 705 1,090
65 738 718 1,190 4,770 3,150 2,590 2,380 1,150 1,040 925 845 787 1,260
60 805 810 1,320 5,720 3,460 2,960 2,640 1,300 1,150 1,020 967 869 1,430
55 917 975 1,440 6,960 3,800 3,360 2,900 1,450 1,270 1,190 1,140 1,030 1,600
50 1,140 1,110 1,570 8,740 4,300 3,710 3,200 1,610 1,420 1,380 1,350 1,170 1,780
45 1,300 1,220 1,710 11,100 4,890 4,130 3,510 1,830 1,580 1,560 1,530 1,310 1,960
40 1,360 1,390 1,850 13,400 5,850 4,570 3,870 2,070 1,790 1,740 1,700 1,480 2,200
35 1,430 1,440 2,010 16,000 7,110 5,030 4,230 2,280 2,000 1,920 1,880 1,610 2,490
30 1,530 1,480 2,170 18,900 8,540 5,650 4,690 2,510 2,170 2,160 2,020 1,720 2,860
25 1,610 1,550 2,360 21,600 10,100 6,420 5,200 2,770 2,340 2,440 2,170 1,840 3,470
20 1,680 1,630 2,650 24,200 12,700 7,440 6,050 3,050 2,560 3,030 2,330 1,990 4,370
15 1,830 1,730 3,780 27,700 16,500 8,970 7,330 3,490 2,820 3,470 2,600 2,140 5,870
10 1,950 1,810 7,080 32,500 22,100 11,200 9,960 4,180 3,350 3,990 2,960 2,320 8,940
5 2,040 1,890 12,700 45,300 32,800 15,000 15,700 6,370 4,880 4,670 3,610 2,530 18,100
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Probability of annual high discharges
[ng, statistic not given]
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Maximum average discharge
(ft3/s)1
___________________________________________________________
Recurrence Maximum
Exceedance interval instantaneous 3-day period 7-day period 15-day period 30-day period
probability (years) (ft3/s)2
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0.99 1.01 2,580 2,550 2,300 1,810 1,360
0.95 1.05 4,570 34,460 34,200 3,880 2,920
0.90 1.11 6,180 36,100 36,000 5,670 4,290
0.80 1.25 8,890 38,850 38,800 38,600 6,690
0.50 2 17,700 317,500 317,000 316,000 14,700
0.20 5 34,900 334,200 333,900 332,100 29,900
0.10 10 49,600 349,000 348,200 346,000 41,900
0.04 25 72,000 370,400 369,000 366,000 58,900
0.02 50 91,200 390,200 389,600 88,100 72,600
0.01 100 113,000 3112,000 3110,000 104,000 86,800
0.005 200 137,000 136,000 131,000 121,000 102,000
0.002 500 173,000 ng ng ng ng
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1 Statistics computed using period of daily value
record 1950-97.
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Annual peak discharge and corresponding gage height, period of record
[--, no data]
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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
1897 April 41.00 -- 1968 July 23 20.41 12,500
1936 April 19 -- 16,600 1969 April 19 41.08 59,000
1937 May 5 -- 4,530 1970 April 29 38.20 31,700
1941 April 15 32.00 22,800 1971 April 11 29.50 23,400
1942 April 7 -- 21,900 1972 April 20 34.75 31,100
1943 April 17 33.66 28,700 1973 March 25 24.49 13,400
1944 April 18 21.05 12,300 1974 April 25 -- 43,900
1945 April 2 31.70 24,600 1975 May 4 39.80 44,000
1946 March 30 -- 23,000 1976 April 7 35.00 27,600
1947 April 28 33.12 29,300 1977 April 9 12.12 3,400
1948 April 21 39.81 57,000 1978 April 16 41.19 56,200
1949 April 12 -- 27,900 1979 April 28 43.66 92,900
1950 May 12 41.58 86,500 1980 April 10 29.00 22,400
1951 April 15 30.10 24,600 1981 July 3 13.96 7,520
1952 April 25 -- 23,900 1982 April 17 36.78 35,500
1953 June 26 20.00 14,700 1983 April 9 30.88 21,300
1954 April 15 16.38 11,100 1984 April 6 -- 32,400
1955 April 11 27.28 18,000 1985 May 21 28.12 17,700
1956 April 27 35.16 28,000 1986 April 7 36.59 29,700
1957 July 4 22.33 14,100 1987 April 7 36.61 27,600
1958 July 12 14.53 7,850 1988 April 7 22.12 13,900
1959 April 8 23.78 11,200 1989 April 19 39.35 41,800
1960 April 14 33.71 24,700 1990 April 7 15.54 5,080
1961 March 31 12.98 3,600 1991 July 11 13.26 4,940
1962 April 24 36.26 32,300 1992 March 16 23.28 8,800
1963 April 12 20.42 12,900 1993 August 14 36.48 27,600
1964 April 20 23.60 15,600 1994 April 6 33.57 27,900
1965 April 22 40.43 47,200 1995 April 1 -- 37,800
1966 April 8 42.15 67,500 1996 April 25 42.41 61,300
1967 April 8 36.70 32,200 1997 April 25 45.55 124,000
Annual peak discharge, from highest to lowest, and corresponding gage height
1997 April 25 45.55 124,000 1982 April 17 36.78 35,500
1979 April 28 43.66 92,900 1984 April 6 -- 32,400
1950 May 12 41.58 86,500 1962 April 24 36.26 32,300
1966 April 8 42.15 67,500 1967 April 8 36.70 32,200
1996 April 25 42.41 61,300 1970 April 29 38.20 31,700
1969 April 19 41.08 59,000 1972 April 20 34.75 31,100
1948 April 21 39.81 57,000 1986 April 7 36.59 29,700
1978 April 16 41.19 56,200 1947 April 28 33.12 29,300
1965 April 22 40.43 47,200 1943 April 17 33.66 28,700
1975 May 4 39.80 44,000 1956 April 27 35.16 28,000
1974 April 25 -- 43,900 1949 April 12 -- 27,900
1989 April 19 39.35 41,800 1994 April 6 33.57 27,900
1995 April 1 -- 37,800 1976 April 7 35.00 27,600
1987 April 7 36.61 27,600 1957 July 4 22.33 14,100
1993 August 14 36.48 27,600 1988 April 7 22.12 13,900
1960 April 14 33.71 24,700 1973 March 25 24.49 13,400
1945 April 2 31.70 24,600 1963 April 12 20.42 12,900
1951 April 15 30.10 24,600 1968 July 23 20.41 12,500
1952 April 25 -- 23,900 1944 April 18 21.05 12,300
1971 April 11 29.50 23,400 1959 April 8 23.78 11,200
1946 March 30 -- 23,000 1954 April 15 16.38 11,100
1941 April 15 32.00 22,800 1992 March 16 23.28 8,800
1980 April 10 29.00 22,400 1958 July 12 14.53 7,850
1942 April 7 -- 21,900 1981 July 3 13.96 7,520
1983 April 9 30.88 21,300 1990 April 7 15.54 5,080
1955 April 11 27.28 18,000 1991 July 11 13.26 4,940
1985 May 21 28.12 17,700 1937 May 5 -- 4,530
1936 April 19 -- 16,600 1961 March 31 12.98 3,600
1964 April 20 23.60 15,600 1977 April 9 12.12 3,400
1953 June 26 20.00 14,700 1897 April 41.00 --
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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
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1936 -- -- -- -- -- -- 5,768 1,826 398.9 117.8 50.1 27.4 --
1937 13.8 -- -- -- -- -- 1,729 1,952 968.4 -- -- -- --
1941 -- -- -- -- -- -- -- -- -- -- -- -- --
1942 -- -- -- -- -- -- 11,400 -- -- -- -- -- --
1943 -- -- -- -- -- -- -- -- -- -- -- -- --
1944 -- -- -- -- -- -- -- -- -- -- -- -- --
1945 -- -- -- -- -- -- 15,870 6,780 3,504 -- -- -- --
1946 -- -- -- -- -- -- 12,430 3,687 2,132 -- -- -- --
1947 -- -- -- -- -- -- -- 10,360 11,140 5,267 1,762 -- --
1948 -- -- -- -- -- -- -- 12,700 3,096 2,067 -- -- --
1949 -- -- -- -- -- -- 11,440 2,977 5,460 3,425 3,265 1,737 --
1950 1,125 1,283 1,069 798.1 729.6 978.7 31,120 58,890 15,360 8,463 3,325 2,300 10,510
1951 2,954 1,987 2,013 1,974 1,830 2,281 17,170 9,022 4,466 2,441 1,245 1,711 4,085
1952 1,360 1,285 1,742 1,639 1,876 1,989 16,590 6,534 3,559 5,676 2,121 1,322 3,797
1953 906.5 812.3 695.5 599.7 619.3 1,669 3,643 3,068 8,839 5,236 2,229 1,320 2,472
1954 864.0 928.2 894.2 809.7 845.4 1,597 5,472 3,862 3,693 2,237 981.3 691.5 1,906
1955 658.3 730.7 683.2 722.6 652.5 661.0 7,273 2,084 3,016 2,271 1,684 862.7 1,771
1956 849.2 607.2 431.0 423.5 451.0 523.9 10,930 8,233 3,963 2,503 908.0 1,616 2,613
1957 599.2 1,080 562.9 441.0 426.8 1,320 4,856 3,728 3,833 6,863 2,614 5,392 2,649
1958 3,625 3,324 1,632 1,356 1,286 1,894 2,986 1,527 1,476 3,990 976.9 479.9 2,052
1959 416.1 498.1 362.3 368.4 382.9 775.8 5,005 1,769 2,587 2,132 776.5 547.8 1,300
1960 547.5 550.2 465.2 572.9 563.4 544.8 13,490 3,778 2,807 2,151 563.7 684.0 2,212
1961 345.2 489.7 356.5 337.1 336.4 1,667 2,097 2,375 1,060 472.0 260.6 368.2 849.5
1962 663.3 422.5 241.1 200.5 203.0 279.5 14,090 9,922 23,420 14,970 6,987 3,390 6,237
1963 2,379 2,114 1,602 1,343 1,120 1,743 6,430 3,511 6,511 2,850 1,172 1,197 2,662
1964 1,435 1,025 787.7 774.2 763.6 694.8 7,567 4,700 7,483 3,227 1,301 694.7 2,529
1965 1,770 1,313 843.3 884.8 872.9 987.4 25,310 13,030 9,178 5,034 2,042 1,915 5,256
1966 4,098 2,497 2,258 2,065 1,826 7,663 38,390 14,400 5,895 3,581 3,512 2,431 7,376
1967 1,847 1,729 1,576 1,710 1,550 2,213 22,710 14,520 5,993 3,278 1,315 876.2 4,939
1968 840.5 724.7 659.3 524.5 535.5 1,713 3,531 2,185 5,594 5,739 2,570 1,899 2,211
1969 1,600 1,865 1,660 1,525 1,576 2,153 27,480 18,730 5,060 3,548 1,666 1,471 5,693
1970 1,968 1,924 1,726 1,381 1,401 1,544 17,340 13,940 12,470 3,727 1,131 1,201 4,973
1971 1,105 1,357 1,096 1,065 1,131 2,640 11,130 3,480 2,429 2,471 1,135 1,413 2,532
1972 4,463 5,653 3,072 1,861 1,449 7,256 22,230 9,171 6,079 2,395 2,439 2,079 5,666
1973 1,775 1,473 1,149 1,126 1,197 6,106 2,450 1,575 1,200 578.7 801.9 3,008 1,874
1974 4,412 2,707 2,014 1,744 1,672 2,016 18,950 18,260 7,633 3,297 3,232 1,967 5,668
1975 1,951 2,079 1,284 1,329 1,435 1,686 16,280 22,890 5,971 28,240 4,003 2,479 7,527
1976 2,364 2,573 1,724 1,630 1,729 3,298 13,300 3,016 1,914 1,359 1,163 712.8 2,886
1977 375.1 276.6 149.3 197.4 201.4 428.5 1,793 938.1 676.4 638.6 243.3 521.0 536.3
1978 1,287 1,121 1,449 1,343 1,124 2,171 36,740 7,427 3,798 3,710 1,537 1,074 5,206
1979 986.1 813.6 797.1 725.2 723.2 879.7 29,260 32,090 6,653 6,268 3,341 2,097 7,076
1980 1,661 1,800 1,491 1,388 1,463 1,654 10,040 2,072 1,532 758.1 488.8 846.2 2,087
1981 556.1 650.7 411.0 304.2 339.6 1,233 1,275 1,365 1,311 2,765 1,509 1,897 1,140
1982 2,571 1,903 1,186 1,112 1,041 1,946 23,650 7,805 3,705 4,246 2,292 1,263 4,386
1983 4,272 2,457 2,114 1,607 1,471 9,329 10,940 3,388 5,122 6,550 2,886 2,941 4,437
1984 2,195 1,978 1,805 1,581 1,582 4,443 19,240 4,246 11,920 3,331 1,442 975.3 4,534
1985 2,208 2,152 1,540 1,326 1,323 6,441 5,751 9,248 8,252 6,962 7,247 4,909 4,803
1986 3,845 2,428 2,313 1,977 1,681 5,311 21,630 16,860 6,437 4,764 2,715 2,993 6,090
1987 3,496 2,037 2,339 1,845 1,673 7,776 15,170 3,427 2,984 2,865 2,502 1,096 3,938
1988 763.6 767.4 695.9 461.5 513.1 2,419 6,250 1,427 946.4 347.7 274.5 328.7 1,262
1989 350.0 332.2 271.0 269.5 356.4 424.8 23,900 4,576 2,292 1,145 451.5 1,048 2,930
1990 474.4 450.9 285.2 174.4 251.8 1,117 2,848 1,513 1,989 1,109 434.7 364.4 917.6
1991 316.6 336.5 245.3 187.0 289.6 680.2 1,894 2,746 2,056 3,179 1,104 1,405 1,208
1992 792.4 593.9 521.7 520.7 500.4 4,887 4,205 2,657 2,176 2,984 1,556 2,557 2,000
1993 1,142 729.2 821.0 813.0 998.0 1,572 15,000 3,915 4,585 10,760 21,580 7,912 5,845
1994 3,800 2,029 1,858 1,539 1,488 7,433 15,550 6,835 6,070 13,920 3,986 4,211 5,748
1995 5,194 4,005 2,721 1,966 1,770 15,720 25,360 11,240 4,526 7,816 2,736 2,259 7,133
1996 3,335 2,924 2,183 2,052 1,978 4,981 30,880 31,420 10,930 4,052 2,951 1,766 8,286
1997 1,735 2,319 2,363 1,973 1,854 2,373 54,710 37,500 9,020 14,980 3,654 2,723 11,280
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