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Statistics of monthly and annual mean discharges, post-regulation period
__________________________________________________________________________________________________________
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 973 1994 9.15 1977 276 200 0.73 5.73
November 831 1986 8.42 1977 290 194 0.67 6.01
December 706 1987 8.10 1977 280 177 0.63 5.82
January 603 1986 19.8 1977 273 152 0.55 5.67
February 647 1994 22.4 1977 282 140 0.50 5.85
March 724 1994 30.4 1977 375 146 0.39 7.78
April 1,200 1997 45.8 1977 566 227 0.40 11.7
May 1,430 1986 14.1 1977 687 328 0.48 14.3
June 1,420 1986 55.0 1977 678 350 0.52 14.1
July 1,250 1953 59.8 1977 501 277 0.55 10.4
August 1,080 1985 50.4 1977 338 255 0.75 7.01
September 1,030 1993 9.17 1976 273 223 0.82 5.67
Annual 842 1986 37.5 1977 402 165 0.41 100
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Monthly and annual flow duration, in cubic feet per second, post-regulation period
______________________________________________________________________________________________________________________
Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
______________________________________________________________________________________________________________________
95 79.9 94.9 126 193 188 132 80.6 52.3 31.3 62.9 59.1 62.1 67.7
90 94.1 128 181 260 285 198 132 74.0 52.8 76.8 104 93.5 101
85 114 144 203 316 335 257 179 88.0 68.9 91.8 120 113 134
80 143 163 220 362 370 321 228 110 83.9 110 135 135 163
75 163 180 236 387 414 394 278 141 106 131 150 152 188
70 182 192 255 411 467 458 325 166 126 145 164 167 212
65 198 207 280 433 526 504 360 192 150 161 182 181 236
60 213 223 308 454 577 556 393 215 170 186 199 194 266
55 229 240 332 482 625 607 422 237 188 202 216 220 297
50 241 254 355 518 672 650 454 258 207 224 238 237 333
45 253 269 381 556 720 694 496 292 232 263 268 253 369
40 268 286 407 594 770 752 536 336 265 295 301 276 404
35 291 311 431 636 821 815 574 369 302 318 322 306 446
30 342 344 457 678 873 892 612 412 344 337 343 339 489
25 378 375 485 744 926 963 675 464 397 356 379 385 548
20 415 404 517 804 981 1,030 764 522 435 384 419 431 617
15 458 443 562 859 1,050 1,110 853 631 481 444 465 484 701
10 527 492 612 942 1,130 1,200 937 711 554 493 523 574 839
5 583 562 700 1,060 1,310 1,330 1,070 915 773 769 749 673 1,010
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Probability of annual high discharges, post-regulation period
[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)
__________________________________________________________________________________________________
0.99 1.01 ng 212 201 177 152
0.95 1.05 456 362 343 312 282
0.90 1.11 549 465 441 406 374
0.80 1.25 676 608 579 541 507
0.50 2 959 925 890 849 811
0.20 5 1,280 1,250 1,230 1,180 1,130
0.10 10 1,460 1,410 1,400 1,350 1,280
0.04 25 1,650 1,560 11,540 1,510 1,420
0.02 50 1,770 1,650 11,620 1,600 1,500
0.01 100 1,880 1,710 11,700 1,680 1,560
0.005 200 1,970 1,760 11,750 1,740 1,610
0.002 500 2,080 ng ng ng ng
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1 Statistical adjustment based on correlation between
3-, 7-, 15-, and 30-consecutive-day periods.
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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
1931 May 18 2.03 686 1965 June 14 4.74 1,330
1932 June 14 -- 551 1966 June 1 4.59 1,490
1933 June 18 -- 577 1967 May 18 4.14 1,130
1934 May 29 2.92 448 1968 May 14 3.37 714
1935 June 26 -- 472 1969 May 31 4.43 1,260
1936 April 14 2.97 468 1970 June 22 3.88 935
1937 July 30 3.27 518 1971 April 9 3.53 755
1938 June 16 -- 544 1972 June 3 4.44 1,360
1939 -- 3.20 603 1973 March 15 3.48 714
1940 September 2 3.28 600 1974 June 3 4.31 1,310
1941 July 2 -- 611 1975 June 21 4.09 1,090
1942 June 6 3.52 747 1976 March 29 3.27 663
1943 April 2 4.31 1,150 1977 September 19 2.88 300
1944 June 4 4.31 1,200 1978 April 9 4.07 1,040
1945 November 14 4.13 1,120 1979 April 17 4.11 1,110
1946 July 19 -- 777 1980 April 9 3.84 903
1947 June 10 4.81 1,370 1981 August 4 2.75 267
1948 May 18 -- 900 1982 May 29 3.71 849
1949 July 8 3.61 564 1983 July 20 3.11 524
1950 May 23 -- 1,100 1984 June 15 3.64 808
1951 April 5 -- 1,160 1985 June 27 4.29 1,270
1952 April 10 3.91 1,040 1986 May 27 4.75 1,600
1953 June 17 5.60 1,710 1987 June 30 3.97 1,050
1954 June 20 4.26 1,210 1988 March 25 3.05 408
1955 August 6 3.53 730 1989 April 10 4.17 1,180
1956 May 29 4.05 1,080 1990 June 14 3.37 650
1957 May 23 3.70 794 1991 July 1 4.00 1,050
1958 March 4 3.19 534 1992 July 25 -- 589
1959 June 8 3.32 612 1993 July 24 4.34 1,290
1960 May 26 3.66 810 1994 May 6 4.30 1,280
1961 May 23 3.44 664 1995 March 20 4.28 1,250
1962 June 26 4.40 1,260 1996 May 25 4.29 1,260
1963 June 17 3.65 745 1997 May 22 4.63 1,500
1964 May 11 3.73 861
Annual peak discharge, from highest to lowest, and corresponding gage height
1953 June 17 5.60 1,710 1993 July 24 4.34 1,290
1986 May 27 4.75 1,600 1994 May 6 4.30 1,280
1997 May 22 4.63 1,500 1985 June 27 4.29 1,270
1966 June 1 4.59 1,490 1962 June 26 4.40 1,260
1947 June 10 4.81 1,370 1969 May 31 4.43 1,260
1972 June 3 4.44 1,360 1996 May 25 4.29 1,260
1965 June 14 4.74 1,330 1995 March 20 4.28 1,250
1974 June 3 4.31 1,310 1954 June 20 4.26 1,210
1944 June 4 4.31 1,200 1955 August 6 3.53 730
1989 April 10 4.17 1,180 1968 May 14 3.37 714
1951 April 5 -- 1,160 1973 March 15 3.48 714
1943 April 2 4.31 1,150 1931 May 18 2.03 686
1967 May 18 4.14 1,130 1961 May 23 3.44 664
1945 November 14 4.13 1,120 1976 March 29 3.27 663
1979 April 17 4.11 1,110 1990 June 14 3.37 650
1950 May 23 -- 1,100 1959 June 8 3.32 612
1975 June 21 4.09 1,090 1941 July 2 -- 611
1956 May 29 4.05 1,080 1939 -- 3.20 603
1987 June 30 3.97 1,050 1940 September 2 3.28 600
1991 July 1 4.00 1,050 1992 July 25 -- 589
1952 April 10 3.91 1,040 1933 June 18 -- 577
1978 April 9 4.07 1,040 1949 July 8 3.61 564
1970 June 22 3.88 935 1932 June 14 -- 551
1980 April 9 3.84 903 1938 June 16 -- 544
1948 May 18 -- 900 1958 March 4 3.19 534
1964 May 11 3.73 861 1983 July 20 3.11 524
1982 May 29 3.71 849 1937 July 30 3.27 518
1960 May 26 3.66 810 1935 June 26 -- 472
1984 June 15 3.64 808 1936 April 14 2.97 468
1957 May 23 3.70 794 1934 May 29 2.92 448
1946 July 19 -- 777 1988 March 25 3.05 408
1971 April 9 3.53 755 1977 September 19 2.88 300
1942 June 6 3.52 747 1981 August 4 2.75 267
1963 June 17 3.65 745
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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]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1931 49.4 42.8 64.3 30.0 65.0 131.8 140.8 159.5 104.4 62.6 32.3 44.4 77.3
1932 30.0 28.8 30.0 40.0 45.0 60.0 81.7 50.6 50.3 32.7 27.2 31.4 42.2
1933 24.5 35.0 95.0 23.0 25.0 170.0 51.3 37.8 61.8 19.1 14.7 25.8 48.8
1934 13.1 17.5 30.3 27.4 26.2 25.8 39.5 18.0 14.2 13.8 11.5 7.99 20.4
1935 11.9 13.7 14.1 16.0 10.8 58.8 51.5 51.8 63.5 102.6 22.8 13.9 36.2
1936 10.5 17.0 36.0 26.5 24.9 32.5 65.0 41.1 21.9 12.8 19.7 21.6 27.4
1937 25.3 23.1 19.5 15.1 15.7 23.5 60.9 58.0 178.2 96.9 72.7 125.0 59.4
1938 88.7 37.8 20.3 20.4 36.1 100.8 144.0 272.2 267.2 79.0 24.9 47.7 95.1
1939 29.4 26.4 46.4 117.4 118.9 228.2 207.0 180.7 83.3 46.4 18.5 16.9 93.2
1940 19.8 22.5 17.6 17.7 32.0 44.7 166.5 308.9 137.0 28.5 19.4 22.3 69.8
1941 22.8 51.4 36.1 58.6 105.2 163.5 277.1 302.7 210.5 99.0 39.0 51.5 117.9
1942 80.1 102.9 104.6 123.5 97.5 133.1 120.1 383.4 426.8 207.8 164.6 230.7 181.5
1943 336.7 362.5 306.2 306.2 240.9 310.1 595.3 656.1 776.3 534.1 432.5 396.7 438.4
1944 381.3 339.1 269.2 199.1 157.8 196.9 309.3 362.0 616.0 470.7 350.3 581.3 352.6
1945 695.2 667.4 502.9 411.6 369.3 527.8 649.7 735.3 640.9 312.3 158.6 142.9 485.0
1946 236.6 270.3 226.3 194.2 146.4 360.1 513.7 569.0 368.4 621.3 610.6 511.4 387.3
1947 559.8 547.9 479.1 415.3 341.8 343.2 703.6 900.3 871.8 560.4 238.1 207.3 514.7
1948 218.9 207.9 191.8 157.4 129.9 247.5 480.6 647.2 443.8 254.2 213.1 190.4 282.2
1949 137.9 115.3 68.1 90.3 107.6 200.6 220.6 224.0 213.9 225.1 178.3 93.5 156.6
1950 89.8 88.8 105.8 109.6 143.0 218.0 428.5 869.5 883.7 666.9 325.7 162.4 342.0
1951 131.3 98.2 111.1 143.6 199.9 260.5 607.6 635.0 661.5 463.5 332.1 321.7 330.6
1952 323.7 353.3 441.4 478.7 484.4 488.7 787.4 822.6 563.8 426.0 446.8 463.4 506.4
1953 349.4 242.2 203.1 169.3 212.0 334.0 421.0 558.3 1,262 1,246 746.9 507.0 522.5
1954 395.5 465.6 443.7 400.0 312.0 482.1 614.1 855.6 903.1 521.7 189.1 229.0 485.0
1955 117.4 146.0 211.5 230.1 190.2 240.0 410.4 355.1 319.3 466.5 465.7 501.8 305.0
1956 389.7 321.6 185.0 235.5 194.0 235.0 642.3 807.8 652.0 247.0 191.8 109.4 350.9
1957 68.9 44.0 69.2 111.0 112.7 274.8 426.7 634.3 592.4 578.4 498.2 436.0 321.7
1958 351.2 394.6 381.8 281.5 271.9 401.0 381.6 218.2 142.6 331.9 225.9 195.6 298.6
1959 153.0 163.1 154.5 238.9 233.5 288.8 321.1 318.5 515.7 430.9 208.4 172.1 266.5
1960 151.7 173.2 217.6 236.0 254.3 234.1 484.4 785.2 702.6 425.9 171.4 115.8 329.3
1961 102.8 130.9 136.2 161.5 168.3 235.2 281.3 346.2 378.8 187.4 95.0 80.6 191.9
1962 99.0 110.4 88.7 81.9 93.6 234.0 433.0 488.7 1,035 939.3 777.2 442.7 403.4
1963 399.7 366.0 317.2 286.3 197.2 284.8 450.5 443.2 555.4 359.6 140.6 155.7 330.2
1964 217.9 180.8 174.1 171.8 155.4 150.3 474.5 801.5 564.4 296.9 78.5 128.9 283.0
1965 228.1 215.5 231.1 216.9 176.5 213.6 565.5 961.1 1,156 730.6 419.6 398.3 460.4
1966 520.4 487.5 518.6 489.0 432.6 605.4 1,033 1,273 1,149 564.4 521.4 411.6 667.9
1967 467.0 506.2 475.8 416.1 367.5 406.1 820.7 1,040 865.9 727.3 243.6 118.0 538.8
1968 201.5 184.1 156.3 136.5 147.9 264.8 397.4 598.1 575.0 431.4 233.6 167.3 291.5
1969 283.1 308.7 275.9 247.9 374.1 461.2 738.1 1,104 910.1 413.3 200.6 59.6 448.1
1970 112.6 150.8 149.7 193.9 214.8 229.0 385.1 679.7 716.5 440.5 122.1 28.8 285.5
1971 89.7 184.4 174.7 150.0 166.5 262.6 458.3 340.1 295.8 351.7 151.7 166.3 232.7
1972 247.6 487.6 592.5 563.8 473.2 510.4 865.5 969.9 1,181 692.3 491.9 425.0 624.6
1973 438.2 391.1 397.1 359.2 357.7 517.8 433.4 371.3 274.3 156.8 130.5 136.9 330.4
1974 380.6 634.3 641.1 506.5 461.2 483.5 608.4 984.0 1,156 666.1 337.2 252.6 592.9
1975 298.8 267.4 187.0 200.5 269.0 412.6 642.6 956.5 1,023 846.3 597.0 369.0 507.0
1976 334.1 320.9 240.9 247.5 305.8 432.9 518.5 317.8 171.0 110.4 57.3 9.17 255.3
1977 9.15 8.42 8.10 19.8 22.4 30.4 45.8 14.1 55.0 59.8 50.4 128.2 37.5
1978 200.8 298.7 363.1 402.5 356.6 384.9 814.4 812.0 519.2 402.3 137.3 96.0 399.0
1979 139.6 109.1 103.9 98.2 132.4 295.9 620.9 972.4 917.6 804.0 701.8 551.0 455.5
1980 343.5 355.7 325.1 357.8 392.7 488.8 548.5 505.2 346.5 166.7 102.8 40.9 330.9
1981 70.2 119.0 113.8 101.1 132.2 207.4 213.2 170.3 124.8 142.2 152.5 58.8 133.9
1982 139.5 220.7 246.9 239.7 256.0 406.6 612.3 748.4 719.8 503.4 276.7 171.9 378.9
1983 299.6 330.9 297.3 281.2 262.6 354.3 374.2 329.5 235.8 287.7 365.5 353.7 314.7
1984 329.8 292.4 257.8 275.4 345.8 369.1 656.2 621.5 637.8 468.2 247.4 125.8 385.4
1985 173.2 193.8 265.4 267.6 270.7 473.5 590.8 901.5 1,087 1,139 1,080 904.1 614.2
1986 817.0 830.6 681.8 603.0 538.6 545.4 1,051 1,427 1,425 883.5 611.0 684.2 842.3
1987 777.1 772.4 706.2 580.1 605.3 652.9 602.1 521.3 467.7 322.2 166.2 174.5 528.6
1988 134.6 130.9 147.9 169.8 231.0 320.0 347.4 356.9 201.9 75.1 78.3 74.0 188.8
1989 68.0 58.5 54.9 92.9 175.4 342.1 653.2 600.2 593.3 305.1 137.5 168.4 270.5
1990 117.1 136.3 120.5 111.1 145.7 294.6 428.1 517.9 551.6 385.3 236.8 163.2 267.8
1991 128.6 92.9 88.9 93.2 158.8 256.3 383.0 699.0 709.6 679.1 429.3 354.7 340.4
1992 200.3 175.6 167.5 205.8 248.8 369.2 443.9 431.9 381.2 351.1 291.4 265.5 294.4
1993 189.9 211.2 200.5 221.0 281.4 419.5 621.0 684.8 979.5 923.7 1,055 1,026 568.6
1994 972.6 798.4 619.1 556.3 646.9 724.3 816.9 1,009 706.7 565.5 408.4 279.4 675.8
1995 322.2 300.7 413.0 410.4 414.3 615.0 894.8 891.6 619.2 509.4 310.7 259.4 497.2
1996 363.0 435.5 414.3 366.1 401.9 546.0 738.8 1,100 1,069 573.9 348.0 223.3 548.4
1997 222.3 281.9 399.2 521.5 532.6 571.2 1,199 1,403 1,054 848.9 724.3 565.6 694.1
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