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Last update: Tuesday, 31-Aug-2004 10:29:05 EDT
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Statistics of monthly and annual mean discharges
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Maximum Minimum Mean
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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
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October 2,190 1987 61.5 1977 704 540 0.77 3.29
November 1,770 1972 92.3 1977 650 402 0.62 3.04
December 1,250 1987 51.2 1977 513 325 0.63 2.40
January 1,020 1987 32.1 1977 432 275 0.64 2.02
February 1,050 1987 45.9 1977 445 252 0.57 2.08
March 9,430 1966 249 1962 2,050 2,060 1.00 9.60
April 20,100 1969 705 1981 6,620 5,280 0.80 31.0
May 8,990 1979 449 1977 3,070 2,270 0.74 14.3
June 10,300 1962 242 1977 2,530 1,990 0.79 11.8
July 20,100 1975 153 1988 2,550 3,890 1.52 11.9
August 11,700 1993 59.5 1977 1,110 2,010 1.81 5.19
September 3,360 1993 38.4 1976 712 702 0.99 3.33
Annual 3,970 1975 214 1977 1,800 1,030 0.57 100
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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 96.8 145 219 746 613 416 191 108 116 144 193 118 149
90 132 166 268 930 809 504 262 172 156 191 229 156 206
85 145 183 311 1,060 911 624 368 209 187 221 270 204 255
80 182 220 380 1,250 1,030 785 484 244 210 263 298 236 301
75 221 238 438 1,500 1,160 939 628 283 237 298 325 256 349
70 259 265 488 1,760 1,310 1,110 765 324 267 325 356 282 408
65 292 299 535 2,080 1,500 1,300 900 361 294 358 406 317 471
60 313 325 608 2,550 1,760 1,500 1,030 397 321 396 452 356 539
55 333 366 703 3,190 2,020 1,710 1,150 494 371 436 496 396 629
50 355 407 815 3,760 2,280 1,950 1,300 565 426 493 553 440 730
45 387 444 910 4,340 2,580 2,160 1,480 638 484 561 618 469 834
40 440 472 1,030 5,030 2,830 2,390 1,650 731 563 614 699 502 946
35 470 496 1,180 5,730 3,050 2,650 1,840 853 657 666 752 552 1,110
30 525 526 1,380 7,070 3,370 2,930 2,080 1,010 751 719 807 636 1,320
25 609 562 1,850 8,600 3,740 3,250 2,390 1,150 842 830 863 719 1,620
20 700 662 2,560 10,700 4,170 3,620 2,780 1,330 1,010 1,030 935 811 2,110
15 780 751 3,710 13,000 4,900 4,080 3,290 1,540 1,310 1,310 1,040 917 2,840
10 885 854 5,030 17,100 6,110 4,850 4,540 1,840 1,600 1,570 1,240 1,060 3,960
5 954 946 8,940 24,300 9,390 7,210 9,560 3,390 2,410 2,080 1,460 1,150 6,810
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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 1,420 1,090 841 691 546
0.95 1.05 2,690 2,300 1,910 1,570 1,260
0.90 1.11 3,720 3,350 2,870 2,370 1,910
0.80 1.25 5,430 5,170 4,580 3,790 3,050
0.50 2 10,700 11,100 10,400 8,710 6,840
0.20 5 20,000 22,100 21,200 18,200 13,700
0.10 10 27,000 30,600 29,700 25,900 18,900
0.04 25 36,700 42,400 41,300 36,700 25,800
0.02 50 44,400 51,700 50,400 45,300 31,000
0.01 100 52,400 61,300 59,800 54,300 36,200
0.005 200 60,600 71,200 69,300 63,700 41,400
0.002 500 71,900 ng ng ng ng
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Probability of annual low discharges
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Minimum average discharge (ft3/s)
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Number of consecutive days
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Non- Recur-
exceed- rence
ance inter- 1 3 7 14 30 60 90 120 183
prob- val
ability (years)
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0.05 20 34.3 37.1 44.3 53.2 65.0 81.4 97.8 112 124
0.10 10 56.1 59.2 67.3 77.7 92.5 114 137 156 172
0.20 5 95.8 98.6 107 119 138 167 199 225 250
0.50 2 223 225 233 247 273 318 370 413 468
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Probability of seasonal low discharges
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Minimum average discharge (ft3/s)
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Number of consecutive days
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Non- Recurrence
exceedance interval 1 7 14 30 1 7 14 30
probability (years)
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December-January-February March-April-May
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0.05 20 66.6 68.5 69.8 78.4 128 136 160 273
0.10 10 98.9 102 105 115 177 190 217 347
0.20 5 153 159 165 176 253 274 306 472
0.50 2 307 322 335 348 454 501 546 891
June-July-August September-October-November
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0.05 20 45.5 66.0 82.2 108 44.9 69.8 79.0 97.1
0.10 10 78.8 103 123 159 72.9 97.3 108 134
0.20 5 145 172 196 249 123 144 158 193
0.50 2 394 421 458 568 282 292 313 373
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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
1936 April 15 16.33 7,670 1968 June 19 7.80 2,350
1937 April 15 9.39 2,660 1969 April 18 38.29 35,700
1942 May 5 12.86 5,060 1970 April 10 22.36 11,600
1943 April 11 31.31 21,800 1971 April 1 15.62 5,480
1944 July 13 15.79 7,200 1972 March 24 28.96 16,200
1945 March 23 23.60 13,300 1973 March 18 17.71 6,200
1946 March 29 19.50 10,000 1974 April 16 26.72 17,800
1947 April 16 33.50 24,500 1975 July 10 38.55 39,900
1948 April 10 -- 16,000 1976 March 31 23.30 9,950
1949 April 7 16.53 7,710 1977 May 7 7.50 2,050
1950 May 11 -- 18,700 1978 April 9 37.61 28,800
1951 April 10 22.43 12,900 1979 April 22 39.00 42,000
1952 April 18 29.78 20,700 1980 April 5 21.98 12,900
1953 June 22 22.78 13,600 1981 May 25 10.57 3,920
1954 April 13 11.44 4,660 1982 April 9 27.13 13,200
1955 April 6 19.28 7,200 1983 July 6 14.98 7,800
1956 April 15 23.67 12,900 1984 April 1 29.99 21,900
1957 June 24 12.20 4,980 1985 May 13 19.07 10,400
1958 July 8 11.31 4,420 1986 March 31 25.89 17,400
1959 June 13 10.13 3,780 1987 March 30 21.43 9,860
1960 April 10 21.66 8,600 1988 March 28 12.42 5,010
1961 May 22 6.96 1,900 1989 April 9 35.65 26,000
1962 June 16 24.70 15,900 1990 April 10 8.55 2,880
1963 June 16 13.14 5,850 1991 July 8 9.99 3,700
1964 April 23 15.27 7,820 1992 March 9 15.64 5,200
1965 April 17 35.27 25,600 1993 August 2 30.56 22,500
1966 March 27 35.35 26,800 1994 April 3 -- 16,600
1967 April 23 22.71 13,800
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 22 39.00 42,000 1946 March 29 19.50 10,000
1975 July 10 38.55 39,900 1976 March 31 23.30 9,950
1969 April 18 38.29 35,700 1987 March 30 21.43 9,860
1978 April 9 37.61 28,800 1960 April 10 21.66 8,600
1966 March 27 35.35 26,800 1964 April 23 15.27 7,820
1989 April 9 35.65 26,000 1983 July 6 14.98 7,800
1965 April 17 35.27 25,600 1949 April 7 16.53 7,710
1947 April 16 33.50 24,500 1936 April 15 16.33 7,670
1993 August 2 30.56 22,500 1944 July 13 15.79 7,200
1984 April 1 29.99 21,900 1955 April 6 19.28 7,200
1943 April 11 31.31 21,800 1973 March 18 17.71 6,200
1952 April 18 29.78 20,700 1963 June 16 13.14 5,850
1950 May 11 -- 18,700 1971 April 1 15.62 5,480
1974 April 16 26.72 17,800 1992 March 9 15.64 5,200
1986 March 31 25.89 17,400 1942 May 5 12.86 5,060
1994 April 3 -- 16,600 1988 March 28 12.42 5,010
1972 March 24 28.96 16,200 1957 June 24 12.20 4,980
1948 April 10 -- 16,000 1954 April 13 11.44 4,660
1962 June 16 24.70 15,900 1958 July 8 11.31 4,420
1967 April 23 22.71 13,800 1981 May 25 10.57 3,920
1953 June 22 22.78 13,600 1959 June 13 10.13 3,780
1945 March 23 23.60 13,300 1991 July 8 9.99 3,700
1982 April 9 27.13 13,200 1990 April 10 8.55 2,880
1951 April 10 22.43 12,900 1937 April 15 9.39 2,660
1956 April 15 23.67 12,900 1968 June 19 7.80 2,350
1980 April 5 21.98 12,900 1977 May 7 7.50 2,050
1970 April 10 22.36 11,600 1961 May 22 6.96 1,900
1985 May 13 19.07 10,400
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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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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
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