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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 2,880 1995 61.5 1977 791 659 0.83 3.30
November 1,840 1995 92.3 1977 714 459 0.64 2.98
December 1,250 1987 51.2 1977 551 340 0.62 2.30
January 1,020 1987 32.1 1977 465 285 0.61 1.94
February 1,270 1997 45.9 1977 490 291 0.59 2.04
March 9,440 1995 249 1962 2,300 2,340 1.02 9.58
April 38,500 1997 705 1981 7,870 7,440 0.95 32.8
May 15,600 1997 449 1977 3,680 3,210 0.87 15.4
June 10,300 1962 242 1977 2,630 1,950 0.74 11.0
July 20,100 1975 153 1988 2,630 3,770 1.43 11.0
August 11,700 1993 59.5 1977 1,120 1,930 1.72 4.69
September 3,360 1993 38.4 1976 721 678 0.94 3.01
Annual 6,030 1997 214 1977 2,010 1,270 0.63 100
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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
________________________________________________________________________________________________________________________________
95 104 149 224 782 634 424 199 113 122 150 194 123 154
90 135 168 276 956 831 521 276 179 162 194 236 161 215
85 152 192 328 1,110 940 666 396 218 193 235 276 215 268
80 201 229 401 1,340 1,070 833 538 256 218 278 307 243 318
75 234 246 462 1,620 1,220 1,020 688 301 248 310 338 268 378
70 278 278 514 1,910 1,410 1,200 837 343 278 344 379 301 440
65 306 318 578 2,350 1,680 1,410 982 383 308 379 432 342 507
60 328 347 671 3,000 1,950 1,610 1,090 461 348 416 482 385 589
55 351 402 798 3,670 2,230 1,870 1,210 545 405 458 536 432 691
50 379 441 894 4,200 2,540 2,090 1,370 617 462 521 614 466 793
45 440 470 1,000 4,860 2,810 2,320 1,550 708 528 584 695 502 894
40 474 499 1,130 5,650 3,100 2,570 1,720 813 604 643 757 559 1,030
35 537 529 1,330 6,900 3,420 2,850 1,960 960 699 697 802 642 1,180
30 636 581 1,690 8,470 3,850 3,140 2,230 1,090 788 790 856 716 1,430
25 714 704 2,100 10,100 4,420 3,440 2,580 1,220 898 974 930 799 1,770
20 775 759 2,770 12,600 5,190 3,820 3,010 1,390 1,060 1,260 1,040 895 2,300
15 836 842 4,220 15,400 6,190 4,300 3,760 1,590 1,290 1,510 1,210 993 3,130
10 898 922 5,610 21,200 7,790 5,030 5,260 1,870 1,520 1,860 1,400 1,090 4,450
5 966 1,040 10,200 26,300 11,400 7,030 9,060 2,890 2,260 2,360 1,620 1,180 7,870
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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 1.01 949 2910 867 706 568
0.95 1.05 1,870 21,800 21,750 1,640 1,320
0.90 1.11 2,660 22,610 22,560 2,510 2,020
0.80 1.25 4,040 23,950 23,850 23,700 3,260
0.50 2 8,790 28,530 28,270 28,000 7,550
0.20 5 18,500 218,000 217,500 217,000 15,700
0.10 10 27,000 226,400 225,700 225,000 22,200
0.04 25 40,000 239,000 238,000 236,000 31,100
0.02 50 51,500 250,000 248,500 246,000 38,100
0.01 100 64,200 262,500 260,000 257,000 45,300
0.005 200 78,400 276,000 273,500 270,000 52,700
0.002 500 99,600 ng ng ng ng
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1From U.S. Army Corps of Engineers, May 2000.
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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
1936 April 15 16.33 7,670 1969 April 18 38.29 35,700
1937 April 15 9.39 2,660 1970 April 10 22.36 11,600
1942 May 5 12.86 5,060 1971 April 1 15.62 5,480
1943 April 11 31.31 21,800 1972 March 24 28.96 16,200
1944 July 13 15.79 7,200 1973 March 18 17.71 6,200
1945 March 23 23.60 13,300 1974 April 16 26.72 17,800
1946 March 29 19.50 10,000 1975 July 10 38.55 39,900
1947 April 16 33.50 24,500 1976 March 31 23.30 9,950
1948 April 10 -- 16,000 1977 May 7 7.50 2,050
1949 April 7 16.53 7,710 1978 April 9 37.61 28,800
1950 May 11 -- 18,700 1979 April 22 39.00 42,000
1951 April 10 22.43 12,900 1980 April 5 21.98 12,900
1952 April 18 29.78 20,700 1981 May 25 10.57 3,920
1953 June 22 22.78 13,600 1982 April 9 27.13 13,200
1954 April 13 11.44 4,660 1983 July 6 14.98 7,800
1955 April 6 19.28 7,200 1984 April 1 29.99 21,900
1956 April 15 23.67 12,900 1985 May 13 19.07 10,400
1957 June 24 12.20 4,980 1986 March 31 25.89 17,400
1958 July 8 11.31 4,420 1987 March 30 21.43 9,860
1959 June 13 10.13 3,780 1988 March 28 12.42 5,010
1960 April 10 21.66 8,600 1989 April 9 35.65 26,000
1961 May 22 6.96 1,900 1990 April 10 8.55 2,880
1962 June 16 24.70 15,900 1991 July 8 9.99 3,700
1963 June 16 13.14 5,850 1992 March 9 15.64 5,200
1964 April 23 15.27 7,820 1993 August 2 30.56 22,500
1965 April 17 35.27 25,600 1994 April 3 -- 16,600
1966 March 27 35.35 26,800 1995 March 31 30.51 23,300
1967 April 23 22.71 13,800 1996 April 18 35.11 25,200
1968 June 19 7.80 2,350 1997 April 19 40.74 71,500
Annual peak discharge, from highest to lowest, and corresponding gage height
1997 April 19 40.74 71,500 1952 April 18 29.78 20,700
1979 April 22 39.00 42,000 1950 May 11 -- 18,700
1975 July 10 38.55 39,900 1974 April 16 26.72 17,800
1969 April 18 38.29 35,700 1986 March 31 25.89 17,400
1978 April 9 37.61 28,800 1994 April 3 -- 16,600
1966 March 27 35.35 26,800 1972 March 24 28.96 16,200
1989 April 9 35.65 26,000 1948 April 10 -- 16,000
1965 April 17 35.27 25,600 1962 June 16 24.70 15,900
1996 April 18 35.11 25,200 1967 April 23 22.71 13,800
1947 April 16 33.50 24,500 1953 June 22 22.78 13,600
1995 March 31 30.51 23,300 1945 March 23 23.60 13,300
1993 August 2 30.56 22,500 1982 April 9 27.13 13,200
1984 April 1 29.99 21,900 1951 April 10 22.43 12,900
1943 April 11 31.31 21,800 1956 April 15 23.67 12,900
1980 April 5 21.98 12,900 1971 April 1 15.62 5,480
1970 April 10 22.36 11,600 1992 March 9 15.64 5,200
1985 May 13 19.07 10,400 1942 May 5 12.86 5,060
1946 March 29 19.50 10,000 1988 March 28 12.42 5,010
1976 March 31 23.30 9,950 1957 June 24 12.20 4,980
1987 March 30 21.43 9,860 1954 April 13 11.44 4,660
1960 April 10 21.66 8,600 1958 July 8 11.31 4,420
1964 April 23 15.27 7,820 1981 May 25 10.57 3,920
1983 July 6 14.98 7,800 1959 June 13 10.13 3,780
1949 April 7 16.53 7,710 1991 July 8 9.99 3,700
1936 April 15 16.33 7,670 1990 April 10 8.55 2,880
1944 July 13 15.79 7,200 1937 April 15 9.39 2,660
1955 April 6 19.28 7,200 1968 June 19 7.80 2,350
1973 March 18 17.71 6,200 1977 May 7 7.50 2,050
1963 June 16 13.14 5,850 1961 May 22 6.96 1,900
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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
__________________________________________________________________________________________________________________________________
1961 -- -- -- -- -- -- -- -- 753.3 313.4 196.8 185.5 --
1962 296.8 227.9 145.7 138.5 163.7 249.4 6,308 5,339 10,310 9,378 3,866 1,325 3,155
1963 822.9 773.1 553.1 395.8 302.7 688.1 2,189 1,323 3,918 929.7 444.0 392.3 1,059
1964 327.6 319.2 247.4 225.0 226.0 303.4 3,930 2,449 1,734 973.0 258.6 239.4 933.2
1965 378.5 383.6 261.8 285.3 266.8 298.5 12,200 3,581 4,137 2,195 1,035 750.7 2,139
1966 1,359 877.5 831.0 745.2 737.3 9,429 9,535 4,607 2,656 1,377 1,643 767.1 2,892
1967 686.0 713.2 643.5 611.9 519.3 1,519 7,193 3,674 3,241 1,731 441.3 169.9 1,760
1968 278.1 292.0 290.6 254.0 235.3 938.1 1,492 1,448 1,671 977.0 401.5 322.8 716.8
1969 511.2 545.4 466.1 331.6 528.9 919.4 20,080 6,715 2,364 2,080 558.3 219.4 2,932
1970 379.5 472.9 335.0 336.6 362.8 575.2 5,844 3,365 5,016 1,183 267.1 179.6 1,521
1971 188.5 409.4 253.4 210.6 226.1 1,556 3,085 1,481 936.8 1,327 345.5 679.5 892.8
1972 1,602 1,771 1,164 963.0 828.1 5,949 7,169 4,400 3,332 1,476 1,109 671.2 2,538
1973 632.1 612.8 445.8 435.5 578.9 2,919 1,382 803.5 608.3 313.7 265.0 1,285 857.7
1974 1,386 999.6 947.7 771.5 731.3 1,305 7,270 5,017 3,013 1,438 821.5 372.6 2,007
1975 486.5 606.2 386.5 329.4 445.3 724.2 11,250 6,195 4,583 20,060 1,494 757.7 3,968
1976 682.4 761.5 484.2 500.2 616.4 2,582 3,786 1,181 430.2 241.5 87.8 38.4 947.8
1977 61.5 92.3 51.2 32.1 45.9 330.8 733.3 449.0 241.6 250.7 59.5 221.4 214.3
1978 646.5 592.7 730.8 706.0 480.2 1,629 16,740 2,950 1,964 2,019 598.7 320.0 2,437
1979 301.6 283.6 258.4 178.1 173.9 461.5 17,350 8,994 2,812 2,487 1,400 847.1 2,959
1980 635.4 813.7 517.9 498.7 453.3 774.0 3,881 979.6 776.3 289.4 229.7 259.6 838.1
1981 266.4 367.0 223.7 140.3 203.2 618.1 704.7 923.3 567.7 678.2 540.9 291.3 462.3
1982 617.5 756.1 483.1 310.6 356.4 1,174 9,299 2,322 1,366 1,050 506.3 281.5 1,538
1983 1,209 915.4 681.9 411.0 314.6 3,674 2,924 1,057 1,607 3,442 776.9 743.2 1,488
1984 737.3 776.6 600.6 506.1 594.1 4,192 9,233 2,173 5,361 1,501 571.4 285.8 2,201
1985 1,350 1,228 818.3 680.2 502.1 3,164 2,198 5,095 4,250 2,395 1,813 1,604 2,102
1986 1,341 1,144 1,056 950.6 940.1 4,642 11,720 8,639 4,218 2,855 1,324 2,034 3,411
1987 2,188 1,420 1,253 1,023 1,052 4,975 4,333 2,044 1,420 1,444 899.0 465.9 1,883
1988 414.8 477.2 461.6 319.9 484.6 2,615 2,146 801.2 449.0 153.3 154.2 171.6 721.0
1989 163.7 216.4 201.6 150.4 249.2 560.4 14,270 2,259 1,535 544.9 281.3 885.8 1,762
1990 304.9 284.8 129.9 118.4 160.1 324.7 1,249 1,112 1,462 635.5 268.6 256.0 525.4
1991 204.8 204.9 140.2 94.4 168.0 638.1 1,142 2,042 1,604 2,283 688.4 861.6 843.5
1992 440.2 325.3 313.2 316.0 349.0 2,447 1,119 951.4 1,600 1,892 904.7 802.6 958.3
1993 393.6 375.7 411.5 407.4 479.3 1,354 8,045 2,123 3,107 10,960 11,700 3,360 3,583
1994 1,950 1,404 1,129 894.1 911.3 4,221 8,797 4,675 2,950 5,993 1,819 2,146 3,084
1995 2,875 1,843 1,004 881.0 885.0 9,444 12,200 6,045 2,957 4,364 1,348 842.0 3,739
1996 1,866 1,586 1,179 796.8 792.2 3,524 14,080 9,748 3,761 1,268 854.8 477.5 3,323
1997 478.4 831.1 726.1 794.8 1,270 1,923 38,460 15,570 4,747 4,953 1,622 1,180 6,028
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