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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 320 287 0.90 4.69
November 952 1987 7.40 1977 296 211 0.71 4.34
December 820 1987 6.60 1977 266 180 0.68 3.90
January 678 1986 8.81 1977 258 159 0.61 3.78
February 687 1987 18.0 1977 268 151 0.57 3.92
March 1,970 1994 84.3 1977 604 426 0.70 8.85
April 4,440 1969 138 1977 1,230 963 0.78 18.1
May 3,080 1986 22.5 1977 1,020 669 0.65 15.0
June 2,680 1962 90.0 1977 1,030 665 0.65 15.0
July 2,790 1993 65.6 1977 777 610 0.79 11.4
August 2,500 1993 53.5 m 419 434 1.03 6.14
September 2,150 1993 2.18 1976 332 365 1.10 4.87
Annual 1,480 1986 54.0 1977 564 300 0.53 100
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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 73.3 88.1 137 229 198 164 97.9 55.4 34.8 64.2 64.2 54.2 70.8
90 88.8 104 175 331 293 217 165 81.6 54.8 78.8 89.4 78.2 101
85 102 118 201 399 362 280 214 101 74.3 95.2 107 103 129
80 121 134 226 443 420 368 253 133 94.1 113 121 118 155
75 142 148 244 484 482 446 309 160 115 130 133 132 180
70 153 166 262 525 555 512 359 187 134 148 147 148 206
65 166 183 290 587 658 595 398 212 156 166 164 164 233
60 181 201 320 650 728 687 445 236 178 187 182 179 370
55 199 219 354 714 792 778 501 263 196 211 202 194 308
50 218 234 390 789 860 864 568 306 215 237 230 209 350
45 236 250 431 876 929 946 641 340 254 282 263 227 392
40 256 278 468 986 1,010 1,040 710 368 295 308 300 249 442
35 278 304 502 1,120 1,110 1,180 800 397 334 334 331 294 493
30 323 330 543 1,300 1,240 1,330 925 450 375 367 362 342 571
25 362 355 612 1,530 1,420 1,490 1,040 509 418 404 399 380 666
20 395 385 725 1,730 1,630 1,640 1,180 586 472 450 437 417 794
15 429 428 865 2,000 1,830 1,790 1,420 681 533 503 518 458 980
10 500 495 1,180 2,490 2,040 2,030 1,670 819 643 644 627 519 1,340
5 592 601 1,930 4,180 2,430 2,470 2,200 1,120 911 888 781 670 1,900
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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)
__________________________________________________________________________________________________
0.99 1.01 333 293 257 223 181
0.95 1.05 657 569 486 415 354
0.90 1.11 923 797 673 570 493
0.80 1.25 1,360 1,180 986 824 719
0.50 2 2,700 2,360 1,970 1,600 1,380
0.20 5 4,940 4,460 3,760 2,950 2,410
0.10 10 6,580 6,060 5,170 3,970 3,130
0.04 25 8,720 8,260 7,170 5,370 4,020
0.02 50 10,300 9,990 8,790 6,470 4,670
0.01 100 12,000 11,800 10,500 7,620 5,300
0.005 200 13,600 13,600 12,300 8,800 5,910
0.002 500 15,700 ng ng ng ng
__________________________________________________________________________________________________
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Probability of annual low discharges
____________________________________________________________________________________
Minimum average discharge (ft3/s)
________________________________________________________________
Number of consecutive days
________________________________________________________________
Non- Recur-
exceed- rence
ance inter- 1 3 7 14 30 60 90 120 183
prob- val
ability (years)
____________________________________________________________________________________
0.05 20 7.50 8.87 10.7 13.3 16.5 25.4 32.8 35.8 44.6
0.10 10 13.0 15.7 19.5 24.0 30.2 44.8 55.0 59.7 71.1
0.20 5 24.2 29.7 37.3 45.3 57.0 80.2 94.1 102 117
0.50 2 69.5 84.6 104 121 146 183 203 218 244
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Probability of seasonal low discharges
___________________________________________________________________________________________
Minimum average discharge (ft3/s)
_______________________________________________________________
Number of consecutive days
_______________________________________________________________
Non- Recurrence
exceedance interval 1 7 14 30 1 7 14 30
probability (years)
___________________________________________________________________________________________
December-January-February March-April-May
____________________________ ___________________________
0.05 20 26.3 31.5 33.4 39.0 50.3 64.4 73.3 108
0.10 10 42.3 52.1 55.7 62.6 76.9 101 115 156
0.20 5 70.3 88.1 94.5 103 120 158 180 234
0.50 2 153 189 201 212 232 286 323 448
June-July-August September-October-November
____________________________ ___________________________
0.05 20 12.2 16.6 30.9 71.3 9.51 14.1 16.7 22.1
0.10 10 24.2 33.0 50.7 95.6 16.7 25.4 30.3 40.5
0.20 5 51.0 68.8 88.4 137 31.5 48.2 57.3 76.5
0.50 2 165 210 224 272 91.6 133 155 196
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Annual peak discharge and corresponding gage height, period of record
_____________________________________________________________________________________
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 1969 April 10 16.34 9,200
1943 April 2 14.75 5,000 1970 April 8 6.93 1,450
1944 June 6 12.11 4,360 1971 March 18 6.74 927
1945 March 17 11.44 3,910 1972 March 19 11.67 3,380
1946 March 22 9.74 3,110 1973 March 15 6.08 1,220
1947 April 12 11.90 4,610 1974 May 24 6.14 1,250
1948 April 6 8.58 2,300 1975 July 3 10.84 3,850
1949 July 10 9.24 2,290 1976 March 26 9.00 2,700
1950 April 2 11.62 4,190 1977 June 25 4.49 526
1951 April 7 14.01 6,090 1978 March 31 14.04 6,250
1952 April 12 14.99 7,130 1979 April 14 15.44 7,050
1953 June 21 9.87 3,150 1980 April 1 10.71 3,100
1954 June 9 7.59 1,860 1981 August 2 4.54 512
1955 April 2 6.99 1,150 1982 April 1 12.26 3,120
1956 April 14 7.88 1,980 1983 March 13 5.70 880
1957 April 22 8.82 2,290 1984 March 28 13.43 4,710
1958 April 15 5.59 866 1985 June 1 10.71 3,690
1959 May 27 6.17 1,050 1986 March 30 14.31 6,140
1960 April 7 8.89 2,370 1987 October 1 7.46 1,770
1961 June 8 4.72 548 1988 March 27 5.58 911
1962 June 11 13.98 5,650 1989 April 5 17.95 8,370
1963 June 11 11.38 3,830 1990 March 18 5.72 900
1964 May 6 7.39 1,700 1991 July 3 9.52 2,980
1965 April 11 14.34 5,690 1992 March 8 8.46 2,000
1966 March 18 12.91 4,760 1993 March 31 14.33 6,080
1967 June 15 8.81 2,500 1994 March 23 13.59 5,000
1968 May 18 4.95 708
Annual peak discharge, from highest to lowest, and corresponding gage height
1969 April 10 16.34 9,200 1950 April 2 11.62 4,190
1989 April 5 17.95 8,370 1945 March 17 11.44 3,910
1952 April 12 14.99 7,130 1975 July 3 10.84 3,850
1979 April 14 15.44 7,050 1963 June 11 11.38 3,830
1978 March 31 14.04 6,250 1985 June 1 10.71 3,690
1986 March 30 14.31 6,140 1972 March 19 11.67 3,380
1951 April 7 14.01 6,090 1942 June 7 10.49 3,280
1993 March 31 14.33 6,080 1953 June 21 9.87 3,150
1965 April 11 14.34 5,690 1982 April 1 12.26 3,120
1962 June 11 13.98 5,650 1946 March 22 9.74 3,110
1943 April 2 14.75 5,000 1980 April 1 10.71 3,100
1994 March 23 13.59 5,000 1991 July 3 9.52 2,980
1966 March 18 12.91 4,760 1976 March 26 9.00 2,700
1984 March 28 13.43 4,710 1967 June 15 8.81 2,500
1947 April 12 11.90 4,610 1960 April 7 8.89 2,370
1944 June 6 12.11 4,360 1948 April 6 8.58 2,300
1949 July 10 9.24 2,290 1959 May 27 6.17 1,050
1957 April 22 8.82 2,290 1971 March 18 6.74 927
1992 March 8 8.46 2,000 1988 March 27 5.58 911
1956 April 14 7.88 1,980 1990 March 18 5.72 900
1954 June 9 7.59 1,860 1983 March 13 5.70 880
1987 October 1 7.46 1,770 1958 April 15 5.59 866
1964 May 6 7.39 1,700 1968 May 18 4.95 708
1970 April 8 6.93 1,450 1961 June 8 4.72 548
1974 May 24 6.14 1,250 1977 June 25 4.49 526
1973 March 15 6.08 1,220 1981 August 2 4.54 512
1955 April 2 6.99 1,150
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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
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