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Statistics of monthly and annual mean discharges
[m, more than 1 year of occurrence]
__________________________________________________________________________________________________________
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 1,600 1994 5.72 1977 329 286 0.87 4.52
November 952 1987 7.40 1977 307 220 0.72 4.23
December 820 1987 6.60 1977 276 180 0.65 3.80
January 678 1986 8.81 1977 269 160 0.60 3.70
February 721 1997 18.0 1977 284 164 0.58 3.91
March 2,630 1995 84.3 1977 670 525 0.78 9.23
April 8,720 1997 138 1977 1,420 1,400 0.98 19.6
May 3,340 1997 22.5 1977 1,110 763 0.68 15.4
June 2,680 1962 90.0 1977 1,060 659 0.62 14.5
July 2,790 1993 65.6 1977 780 595 0.76 10.7
August 2,500 1993 53.5 m 422 424 1.00 5.82
September 2,150 1993 2.18 1976 334 357 1.07 4.59
Annual 1,600 1997 54.0 1977 601 336 0.56 100
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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 74.6 88.2 140 244 204 169 101 59.1 36.2 65.1 64.1 55.7 73.4
90 90.3 104 177 339 302 222 172 83.8 57.0 80.4 90.7 80.6 105
85 104 124 206 401 373 294 221 106 77.4 98.3 108 106 133
80 127 138 233 451 435 386 262 139 98.5 116 125 122 160
75 145 152 250 494 505 464 324 168 120 134 137 136 187
70 157 172 268 547 592 533 372 196 140 152 148 154 214
65 171 190 300 612 690 629 411 221 163 173 169 170 247
60 188 206 334 681 754 723 462 245 184 195 193 186 280
55 208 221 370 753 818 815 521 278 202 218 216 202 321
50 227 240 409 832 896 899 588 319 224 251 244 218 363
45 247 263 450 939 977 982 658 346 262 290 276 241 408
40 270 290 489 1,080 1,080 1,100 725 373 298 316 304 277 455
35 308 323 528 1,260 1,190 1,240 819 400 334 341 333 325 509
30 350 346 593 1,470 1,370 1,390 930 456 376 378 367 366 594
25 384 374 690 1,700 1,570 1,540 1,040 516 421 415 402 401 696
20 414 420 819 1,940 1,780 1,680 1,170 597 476 465 458 434 820
15 458 463 988 2,320 2,000 1,830 1,400 696 536 525 536 466 1,030
10 514 532 1,380 2,980 2,250 2,080 1,630 823 647 670 650 523 1,420
5 593 632 2,340 4,690 2,630 2,440 2,160 1,100 885 905 809 664 2,060
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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 1.01 230 22225 22220 22205 192
0.95 1.05 460 22450 22440 426 364
0.90 1.11 670 22650 22630 584 503
0.80 1.25 1,030 22990 22940 848 734
0.50 2 2,250 222,210 2,090 1,690 1,440
0.20 5 4,450 224,350 4,110 3,260 2,680
0.10 10 6,200 226,100 5,760 4,530 3,620
0.04 25 8,050 227,900 227,510 6,380 4,910
0.02 50 9,900 229,750 229,250 7,930 5,930
0.01 100 11,900 2211,700 2211,200 9,600 6,980
0.005 200 14,200 2214,000 2213,400 11,400 8,060
0.002 500 18,000 ng ng ng ng
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1From U.S. Army Corps of Engineers, May 2000.
2Statistical 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
1942 June 7 10.49 3,280 1970 April 8 6.93 1,450
1943 April 2 14.75 5,000 1971 March 18 6.74 927
1944 June 6 12.11 4,360 1972 March 19 11.67 3,380
1945 March 17 11.44 3,910 1973 March 15 6.08 1,220
1946 March 22 9.74 3,110 1974 May 24 6.14 1,250
1947 April 12 11.90 4,610 1975 July 3 10.84 3,850
1948 April 6 8.58 2,300 1976 March 26 9.00 2,700
1949 July 10 9.24 2,290 1977 June 25 4.49 526
1950 April 2 11.62 4,190 1978 March 31 14.04 6,250
1951 April 7 14.01 6,090 1979 April 14 15.44 7,050
1952 April 12 14.99 7,130 1980 April 1 10.71 3,100
1953 June 21 9.87 3,150 1981 August 2 4.54 512
1954 June 9 7.59 1,860 1982 April 1 12.26 3,120
1955 April 2 6.99 1,150 1983 March 13 5.70 880
1956 April 14 7.88 1,980 1984 March 28 13.43 4,710
1957 April 22 8.82 2,290 1985 June 1 10.71 3,690
1958 April 15 5.59 866 1986 March 30 14.31 6,140
1959 May 27 6.17 1,050 1987 October 1 7.46 1,770
1960 April 7 8.89 2,370 1988 March 27 5.58 911
1961 June 8 4.72 548 1989 April 5 17.95 8,370
1962 June 11 13.98 5,650 1990 March 18 5.72 900
1963 June 11 11.38 3,830 1991 July 3 9.52 2,980
1964 May 6 7.39 1,700 1992 March 8 8.46 2,000
1965 April 11 14.34 5,690 1993 March 31 14.33 6,080
1966 March 18 12.91 4,760 1994 March 23 13.59 5,000
1967 June 15 8.81 2,500 1995 March 17 14.88 6,370
1968 May 18 4.95 708 1996 May 19 -- 5,400
1969 April 10 16.34 9,200 1997 April 15 -- 12,800
Annual peak discharge, from highest to lowest, and corresponding gage height
1997 April 15 -- 12,800 1966 March 18 12.91 4,760
1969 April 10 16.34 9,200 1984 March 28 13.43 4,710
1989 April 5 17.95 8,370 1947 April 12 11.90 4,610
1952 April 12 14.99 7,130 1944 June 6 12.11 4,360
1979 April 14 15.44 7,050 1950 April 2 11.62 4,190
1995 March 17 14.88 6,370 1945 March 17 11.44 3,910
1978 March 31 14.04 6,250 1975 July 3 10.84 3,850
1986 March 30 14.31 6,140 1963 June 11 11.38 3,830
1951 April 7 14.01 6,090 1985 June 1 10.71 3,690
1993 March 31 14.33 6,080 1972 March 19 11.67 3,380
1965 April 11 14.34 5,690 1942 June 7 10.49 3,280
1962 June 11 13.98 5,650 1953 June 21 9.87 3,150
1996 May 19 -- 5,400 1982 April 1 12.26 3,120
1943 April 2 14.75 5,000 1946 March 22 9.74 3,110
1994 March 23 13.59 5,000 1980 April 1 10.71 3,100
1991 July 3 9.52 2,980 1974 May 24 6.14 1,250
1976 March 26 9.00 2,700 1973 March 15 6.08 1,220
1967 June 15 8.81 2,500 1955 April 2 6.99 1,150
1960 April 7 8.89 2,370 1959 May 27 6.17 1,050
1948 April 6 8.58 2,300 1971 March 18 6.74 927
1949 July 10 9.24 2,290 1988 March 27 5.58 911
1957 April 22 8.82 2,290 1990 March 18 5.72 900
1992 March 8 8.46 2,000 1983 March 13 5.70 880
1956 April 14 7.88 1,980 1958 April 15 5.59 866
1954 June 9 7.59 1,860 1968 May 18 4.95 708
1987 October 1 7.46 1,770 1961 June 8 4.72 548
1964 May 6 7.39 1,700 1977 June 25 4.49 526
1970 April 8 6.93 1,450 1981 August 2 4.54 512
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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
__________________________________________________________________________________________________________________________________
1942 -- -- -- -- -- -- -- 1,021 1,278 934.2 391.8 476.3 --
1943 391.9 -- -- -- -- 412.3 2,152 1,669 1,818 1,069 562.4 402.8 --
1944 415.3 330.8 281.6 196.5 152.4 195.2 641.2 960.6 1,957 1,380 418.8 614.7 628.4
1945 753.6 698.3 510.2 405.3 375.7 1,250 1,133 837.5 916.3 305.0 146.2 140.7 623.6
1946 224.4 260.1 221.5 189.7 127.5 823.1 1,114 604.5 362.5 716.1 607.9 501.3 481.4
1947 597.2 583.3 482.6 413.2 345.0 486.5 2,021 1,627 1,487 1,083 231.7 207.0 797.7
1948 196.3 205.1 186.5 148.7 115.2 256.1 1,279 1,403 545.3 255.5 217.1 179.2 415.7
1949 130.8 117.7 54.8 69.8 85.7 242.3 406.4 217.9 224.7 727.7 198.2 92.1 215.1
1950 97.8 99.3 95.0 87.9 132.4 446.5 1,340 1,572 1,458 1,526 675.5 211.6 648.0
1951 146.2 124.3 126.1 155.2 147.9 241.6 2,208 1,615 1,063 592.8 370.9 331.6 593.5
1952 354.7 384.9 501.3 524.5 535.2 468.4 3,161 1,876 1,554 746.2 409.4 443.5 910.3
1953 351.6 235.8 189.2 166.5 192.7 549.6 542.9 756.0 1,669 1,347 856.3 564.9 620.5
1954 387.9 462.9 453.7 376.8 350.2 561.9 677.0 851.7 1,041 540.6 200.6 234.8 511.9
1955 124.3 137.5 198.7 245.5 186.4 266.5 543.1 330.2 305.9 509.7 445.4 448.1 312.3
1956 376.2 305.3 183.9 247.7 215.5 259.7 847.3 812.0 699.4 240.8 272.8 118.7 381.3
1957 70.8 49.7 65.7 106.0 113.9 448.2 672.1 930.9 1,067 790.5 521.6 461.6 442.9
1958 375.1 460.9 385.5 316.5 285.4 484.5 656.1 259.7 141.5 362.7 227.7 179.4 344.9
1959 142.7 160.0 172.6 259.7 245.0 315.5 370.1 425.8 564.0 514.3 213.8 162.2 295.7
1960 152.6 147.0 201.6 233.5 249.0 343.5 901.6 869.1 796.9 466.6 180.8 111.6 387.5
1961 98.8 124.8 150.3 155.6 180.5 300.0 290.8 389.0 425.7 190.1 78.9 79.0 205.2
1962 108.1 102.9 75.0 84.3 102.4 251.3 1,028 1,929 2,675 2,756 1,983 746.4 992.4
1963 434.0 360.7 326.5 312.3 232.9 397.6 607.5 509.4 1,591 480.9 157.1 159.2 463.6
1964 220.8 178.8 147.9 151.0 161.5 182.4 776.5 978.9 600.3 292.2 79.5 125.1 324.4
1965 224.4 213.7 236.0 197.9 184.3 226.0 1,789 1,490 2,526 1,230 415.0 422.3 762.4
1966 724.2 545.7 510.0 500.0 443.9 1,651 1,492 2,076 1,671 628.5 522.7 350.4 929.3
1967 448.9 457.4 403.9 391.1 363.4 659.5 1,388 1,239 1,182 882.5 227.2 114.6 647.3
1968 192.8 176.3 177.9 137.3 141.7 308.9 414.8 570.6 584.1 428.1 227.0 161.4 293.8
1969 295.4 311.5 257.9 219.5 402.1 526.1 4,436 2,606 1,317 470.7 204.8 64.4 923.6
1970 109.2 128.4 135.6 158.2 179.2 254.4 629.1 755.9 815.9 459.8 112.1 26.4 313.8
1971 89.6 170.2 147.5 130.6 132.8 424.4 547.2 368.5 342.3 465.9 165.8 167.9 263.3
1972 239.2 491.5 641.1 595.7 475.0 1,295 1,734 1,541 1,547 833.5 624.0 451.3 872.5
1973 436.2 361.8 390.7 351.7 359.5 791.4 547.8 370.4 301.4 151.2 121.9 114.3 358.5
1974 372.3 528.9 494.0 445.5 492.3 549.0 679.6 1,004 1,115 696.3 349.3 247.4 581.2
1975 282.4 275.0 177.8 187.8 249.8 341.8 1,258 1,231 1,283 1,787 585.3 363.0 670.6
1976 314.5 308.7 268.7 246.3 360.3 961.6 725.5 329.6 158.1 109.4 53.5 2.18 319.9
1977 5.72 7.40 6.60 8.81 18.0 84.3 138.0 22.5 90.0 65.6 53.5 149.1 54.0
1978 227.5 329.5 364.8 394.6 328.6 1,360 3,112 1,698 1,206 1,482 277.8 105.0 908.9
1979 141.7 117.9 114.2 104.1 102.7 324.5 3,245 1,977 1,763 1,223 825.1 600.9 878.5
1980 418.2 364.0 338.9 404.8 417.9 719.4 935.9 568.4 537.1 188.4 126.7 34.8 420.7
1981 65.0 112.4 108.9 103.6 153.0 227.0 211.3 183.9 208.2 186.8 225.6 52.0 153.2
1982 142.3 182.9 197.6 231.4 253.3 602.4 1,179 888.8 731.4 556.9 299.5 179.5 454.2
1983 410.6 362.6 353.3 327.1 325.1 541.4 434.2 324.2 212.8 335.0 351.4 345.8 360.8
1984 312.9 273.2 233.5 265.7 350.2 1,159 1,763 984.0 1,969 868.7 357.9 137.9 721.6
1985 440.6 501.3 367.1 268.4 311.2 1,193 954.5 1,299 1,762 1,157 1,104 938.9 860.7
1986 802.9 769.5 751.5 677.7 663.2 1,679 2,907 3,085 2,485 1,664 782.8 1,434 1,477
1987 1,247 952.2 820.3 613.6 687.1 958.5 725.1 584.5 492.6 364.9 188.2 187.1 652.1
1988 145.3 145.2 142.5 151.8 257.9 528.8 423.4 376.1 221.4 85.6 87.8 70.5 219.5
1989 68.1 61.8 51.6 71.8 159.1 578.1 3,003 1,110 728.3 317.9 152.0 219.3 541.5
1990 157.4 130.9 111.3 124.1 167.9 482.0 422.6 513.2 528.3 392.2 234.1 156.6 285.7
1991 114.4 82.8 86.6 81.9 97.2 330.9 459.8 752.0 1,025 1,497 532.1 802.2 490.6
1992 289.4 165.1 137.1 179.7 227.2 576.9 493.4 424.7 450.8 401.4 431.5 284.6 339.0
1993 183.1 197.4 198.7 186.2 239.0 922.1 2,086 1,095 1,586 2,787 2,496 2,148 1,181
1994 1,599 842.1 354.8 558.7 574.1 1,967 2,609 2,366 1,343 1,644 641.3 292.3 1,238
1995 441.5 307.3 425.2 383.1 444.1 2,629 2,619 2,419 1,523 855.2 318.3 270.0 1,056
1996 756.5 884.0 481.3 494.6 500.6 1,893 2,740 2,378 1,376 595.0 346.5 209.8 1,055
1997 219.5 303.1 398.1 462.6 721.3 941.9 8,717 3,344 1,777 1,044 765.3 581.9 1,600
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