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Statistics of monthly and annual mean discharges
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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 1,560 1994 2.02 1977 397 394 0.99 4.48
November 900 1987 0 1977 332 272 0.82 3.74
December 817 1986 0 1977 291 217 0.75 3.28
January 747 1986 4.95 1977 284 193 0.68 3.20
February 745 1987 14.0 1977 336 207 0.61 3.79
March 2,690 1995 75.9 1977 922 650 0.71 10.4
April 9,860 1997 165 1977 2,200 2,210 1.00 24.8
May 3,920 1997 22.0 1977 1,280 1,080 0.84 14.5
June 2,480 1986 86.4 1977 1,040 696 0.67 11.7
July 2,670 1993 73.4 1977 840 684 0.81 9.46
August 2,670 1993 35.6 1977 511 560 1.10 5.75
September 2,140 1993 12.6 1976 434 521 1.20 4.88
Annual 1,730 1997 53.1 1977 740 466 0.63 100
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Monthly and annual flow duration, in cubic feet per second
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Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
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95 44.4 75.1 138 210 158 163 76.3 41.8 26.6 35.4 42.5 41.5 55.2
90 66.1 95.4 203 328 279 204 99.4 76.1 48.9 66.9 69.1 60.7 86.3
85 89.3 110 247 425 357 242 143 88.4 63.1 84.8 90.0 77.1 117
80 99.5 132 314 466 409 303 193 121 84.9 112 112 103 154
75 112 176 372 540 454 408 250 167 114 129 124 118 191
70 138 212 404 670 520 488 324 214 147 143 138 129 230
65 172 245 429 767 630 568 378 262 170 172 159 157 271
60 207 266 454 848 733 654 462 302 196 200 186 202 310
55 234 287 494 956 807 749 536 336 222 225 206 236 348
50 256 305 535 1,190 918 849 619 365 247 266 244 261 392
45 278 323 597 1,470 1,040 974 707 393 273 299 282 277 440
40 301 344 668 1,770 1,150 1,130 838 427 301 327 313 304 498
35 337 368 749 2,030 1,320 1,270 961 461 336 356 347 338 604
30 375 400 822 2,380 1,600 1,410 1,080 542 383 400 380 367 711
25 413 449 895 2,660 1,850 1,580 1,200 688 486 457 422 399 820
20 447 513 1,090 3,280 2,180 1,760 1,360 775 606 596 510 438 992
15 490 610 1,560 4,180 2,430 1,940 1,670 843 769 813 735 482 1,270
10 549 676 2,080 5,530 2,740 2,210 1,950 1,030 1,030 998 832 583 1,810
5 690 747 3,380 8,350 3,390 2,590 2,310 1,180 1,960 1,340 929 799 2,510
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Probability of annual high discharges
[ng, statistic not given]
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Maximum average discharge
(ft3/s)
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Recurrence Maximum
Exceedance interval instantaneous 3-day period 7-day period 15-day period 30-day period
probability (years) (ft3/s)
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0.99 1.01 ng 169 154 120 109
0.95 1.05 ng 468 420 329 284
0.90 1.11 ng 769 685 538 454
0.80 1.25 ng 1,340 1,190 938 771
0.50 2 ng 3,440 3,050 2,420 1,900
0.20 5 ng 7,530 6,730 5,380 4,090
0.10 10 ng 10,700 9,620 7,720 5,780
0.04 25 ng 14,900 13,600 10,900 8,050
0.02 50 ng 18,100 16,600 13,400 9,780
0.01 100 ng 21,200 19,600 15,900 11,500
0.005 200 ng 24,300 22,600 18,300 13,200
0.002 500 ng ng ng ng ng
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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
1976 March 31 16.94 2,500 1987 March 26 15.34 2,460
1977 June 27 10.30 408 1988 March 30 10.97 826
1978 April 2 33.54 9,200 1989 April 7 35.81 12,900
1979 April 18 33.03 9,600 1990 April 2 11.26 857
1980 April 4 19.13 3,250 1991 July 5 16.15 2,820
1981 August 4 10.41 544 1992 March 10 13.62 1,750
1982 April 4 23.07 4,200 1993 April 3 28.30 6,400
1983 March 19 11.08 824 1994 April 1 26.43 6,320
1984 March 31 25.58 5,100 1995 March 20 29.63 8,000
1985 June 3 18.71 3,680 1996 April 14 28.26 6,290
1986 April 1 27.27 6,720 1997 April 14 -- 13,300
Annual peak discharge, from highest to lowest, and corresponding gage height
1997 April 14 -- 13,300 1985 June 3 18.71 3,680
1989 April 7 35.81 12,900 1980 April 4 19.13 3,250
1979 April 18 33.03 9,600 1991 July 5 16.15 2,820
1978 April 2 33.54 9,200 1976 March 31 16.94 2,500
1995 March 20 29.63 8,000 1987 March 26 15.34 2,460
1986 April 1 27.27 6,720 1992 March 10 13.62 1,750
1993 April 3 28.30 6,400 1990 April 2 11.26 857
1994 April 1 26.43 6,320 1988 March 30 10.97 826
1996 April 14 28.26 6,290 1983 March 19 11.08 824
1984 March 31 25.58 5,100 1981 August 4 10.41 544
1982 April 4 23.07 4,200 1977 June 27 10.30 408
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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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1975 -- -- -- -- -- -- -- -- -- -- -- -- --
1976 368.5 327.7 261.6 228.9 319.3 870.3 880.3 367.8 231.2 120.1 68.4 12.6 337.9
1977 2.02 0 0 4.95 14.0 75.9 165.4 22.0 86.4 73.4 35.6 159.7 53.1
1978 255.6 304.1 378.4 403.5 333.7 1,002 4,165 1,610 1,165 1,404 320.5 120.6 955.0
1979 146.3 118.6 115.4 104.5 102.0 314.4 3,980 2,013 1,760 1,315 875.3 616.4 954.8
1980 415.6 372.1 328.7 375.9 402.6 641.2 1,301 599.8 537.1 193.8 135.6 36.0 443.9
1981 64.9 107.3 105.5 105.8 151.4 245.9 228.8 201.4 228.8 204.5 266.1 56.3 161.4
1982 148.4 195.8 200.5 233.2 251.8 679.3 1,721 933.2 822.7 608.0 339.9 221.0 529.5
1983 424.1 373.4 359.5 334.0 326.3 639.9 514.9 378.1 230.9 403.7 346.1 380.1 393.3
1984 329.9 272.5 261.5 278.2 367.5 1,113 2,132 985.2 1,918 972.1 414.0 186.4 767.5
1985 443.7 561.2 365.2 267.7 307.3 1,199 1,023 1,250 1,863 1,202 1,073 969.2 879.2
1986 851.0 790.4 816.6 746.8 681.0 1,543 3,791 3394 2,485 1,784 852.5 1,496 1,604
1987 1312 900.0 798.0 639.9 744.8 1,337 832.4 651.5 509.4 382.5 180.1 172.9 705.8
1988 147.4 151.7 142.8 148.4 237.0 519.4 470.5 385.4 244.9 85.4 87.2 72.6 224.2
1989 69.1 65.5 52.7 68.4 157.3 378.3 3,832 1,153 819.7 349.9 159.8 219.8 607.4
1990 170.7 126.6 95.1 103.7 118.5 356.5 453.5 520.7 561.6 432.4 243.4 171.7 280.3
1991 127.7 66.8 63.2 63.1 88.2 353.5 548.5 854.5 1,049 1,631 554.3 815.9 520.3
1992 321.1 139.8 147.6 180.9 237.4 734.8 555.6 459.0 537.6 395.5 495.9 309.5 376.9
1993 214 236 204 197 302 791 2,820 1,100 1,610 2,670 2,670 2,140 1,250
1994 1,560 776 432 469 655 2,080 3,010 2,340 1,410 1,610 671 294 1,280
1995 440.0 287.2 403.7 402.3 447.0 2,687 2,820 2,410 1,569 997.6 361.5 281.2 1,096
1996 695.1 854.1 496.8 478.6 493.1 1,838 3,397 2,708 1,415 610.8 348.9 209.5 1,128
1997 235.0 278.3 374.2 422.9 661.2 892.2 9,864 3,925 1,809 1,029 729.4 600.4 1,729
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