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Statistics of monthly and annual mean discharges
__________________________________________________________________________________________________________
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 483 1972 21.5 1941 116 97.5 0.84 5.57
November 503 1972 23.8 1991 92.0 69.3 0.75 4.40
December 140 1978 24.4 1990 64.0 25.2 0.39 3.07
January 90.1 1952 18.4 1940 51.8 17.4 0.34 2.48
February 98.4 1974 19.0 1940 48.3 17.2 0.36 2.31
March 445 1995 22.8 1940 114 98.2 0.86 5.47
April 1,470 1997 26.8 1977 542 379 0.70 26.0
May 1,970 1950 7.52 1977 355 322 0.91 17.0
June 1,140 1962 30.1 1991 252 223 0.89 12.1
July 1,070 1997 16.0 1940 223 211 0.95 10.7
August 507 1985 13.3 1940 124 104 0.84 5.92
September 666 1973 14.1 1940 106 98.4 0.93 5.06
Annual 354 1950 57.0 1990 175 73.6 0.42 100
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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 25.4 25.9 27.1 34.7 35.4 34.2 29.2 22.5 21.2 27.0 31.1 29.6 26.6
90 29.5 28.7 31.0 56.0 60.0 45.5 43.4 30.0 29.0 35.0 38.7 36.0 33.2
85 32.8 30.6 33.8 76.2 81.0 57.6 53.1 36.7 34.6 40.9 43.3 38.6 38.5
80 35.7 32.5 36.1 96.2 101 72.2 61.6 41.8 39.4 44.2 46.7 40.6 43.3
75 38.1 34.1 39.8 128 120 86.8 70.1 45.9 44.4 47.4 50.5 44.8 47.8
70 40.7 36.3 43.8 163 141 99.8 79.1 50.3 50.1 50.3 54.5 47.8 52.2
65 43.4 39.0 46.7 198 162 111 89.3 55.0 55.1 54.3 58.5 51.7 57.0
60 45.5 41.4 49.6 230 181 123 99.9 60.9 61.1 59.4 62.6 54.7 63.8
55 47.8 44.5 53.0 276 204 135 111 68.2 67.3 67.9 67.8 57.4 70.6
50 50.8 46.6 56.4 335 228 149 128 77.2 73.6 73.5 73.5 59.7 78.2
45 53.9 48.5 60.8 395 259 167 147 89.0 80.5 81.0 80.2 63.4 85.9
40 55.9 50.3 66.1 458 293 188 168 103 87.5 97.9 87.0 68.4 98.3
35 58.4 53.1 73.8 538 337 213 189 115 94.8 113 93.9 72.2 114
30 61.6 56.7 83.0 638 386 253 219 130 103 131 102 75.8 137
25 65.1 61.0 93.4 742 439 302 261 147 114 152 110 79.4 169
20 70.3 66.2 104 858 516 361 312 170 133 172 122 83.9 210
15 73.1 70.3 159 1,020 623 439 374 207 172 193 137 88.9 285
10 76.5 73.8 294 1,340 785 538 471 270 231 246 166 96.2 407
5 83.0 79.3 494 1,910 1,100 786 703 389 312 322 199 108 664
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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 1.01 311 1303 285 228 169
0.95 1.05 493 466 413 331 253
0.90 1.11 626 577 505 405 313
0.80 1.25 831 749 647 519 405
0.50 2 1,410 1,240 1,050 843 656
0.20 5 2,330 2,050 1,740 1,390 1,060
0.10 10 3,010 2,680 2,280 1,820 1,350
0.04 25 3,930 3,560 3,050 2,430 1,750
0.02 50 4,650 4,290 3,700 2,940 2,060
0.01 100 5,400 5,070 4,400 3,490 2,390
0.005 200 6,180 5,900 5,170 4,100 2,740
0.002 500 7,260 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
1939 April 27 -- 380 1969 April 11 11.89 3,630
1940 April 16 6.98 840 1970 April 26 9.48 2,080
1941 June 8 6.57 756 1971 April 10 8.32 1,520
1942 April 3 6.12 722 1972 April 16 10.33 2,550
1943 April 21 6.43 800 1973 September 6 7.98 1,270
1944 August 10 8.12 1,160 1974 April 22 10.31 2,540
1945 March 28 6.76 952 1975 July 4 11.19 2,960
1946 March 23 8.09 1,030 1976 April 1 8.86 1,250
1947 June 11 8.34 1,420 1977 September 27 4.85 429
1948 April 25 6.80 929 1978 April 13 11.40 3,270
1949 June 1 9.08 1,870 1979 April 25 12.31 3,940
1950 May 6 11.33 3,630 1980 April 8 6.57 898
1951 May 3 7.22 1,110 1981 June 29 7.37 1,150
1952 April 15 8.10 1,440 1982 April 16 8.71 1,700
1953 July 5 6.23 834 1983 March 7 10.17 1,200
1954 April 13 8.52 1,640 1984 June 9 9.07 1,880
1955 April 6 9.64 1,800 1985 August 19 8.59 1,650
1956 April 21 9.58 2,240 1986 May 1 8.03 1,430
1957 June 27 11.84 3,570 1987 July 27 7.62 1,290
1958 July 6 6.08 822 1988 April 7 8.22 900
1959 April 6 6.37 702 1989 April 15 9.34 1,200
1960 April 7 8.18 710 1990 June 22 4.67 393
1961 April 25 4.88 461 1991 July 7 5.39 565
1962 June 9 11.90 3,640 1992 August 26 6.60 776
1963 April 4 7.54 966 1993 July 28 7.20 954
1964 April 17 8.57 1,640 1994 July 9 9.22 1,440
1965 April 12 11.88 3,620 1995 March 18 9.08 1,610
1966 April 3 10.73 2,000 1996 April 19 11.68 3,320
1967 April 3 10.19 2,470 1997 April 16 12.74 2,700
1968 June 18 11.00 3,000
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 25 12.31 3,940 1967 April 3 10.19 2,470
1962 June 9 11.90 3,640 1956 April 21 9.58 2,240
1950 May 6 11.33 3,630 1970 April 26 9.48 2,080
1969 April 11 11.89 3,630 1966 April 3 10.73 2,000
1965 April 12 11.88 3,620 1984 June 9 9.07 1,880
1957 June 27 11.84 3,570 1949 June 1 9.08 1,870
1996 April 19 11.68 3,320 1955 April 6 9.64 1,800
1978 April 13 11.40 3,270 1982 April 16 8.71 1,700
1968 June 18 11.00 3,000 1985 August 19 8.59 1,650
1975 July 4 11.19 2,960 1954 April 13 8.52 1,640
1997 April 16 12.74 2,700 1964 April 17 8.57 1,640
1972 April 16 10.33 2,550 1995 March 18 9.08 1,610
1974 April 22 10.31 2,540 1971 April 10 8.32 1,520
1952 April 15 8.10 1,440 1988 April 7 8.22 900
1994 July 9 9.22 1,440 1980 April 8 6.57 898
1986 May 1 8.03 1,430 1940 April 16 6.98 840
1947 June 11 8.34 1,420 1953 July 5 6.23 834
1987 July 27 7.62 1,290 1958 July 6 6.08 822
1973 September 6 7.98 1,270 1943 April 21 6.43 800
1976 April 1 8.86 1,250 1992 August 26 6.60 776
1983 March 7 10.17 1,200 1941 June 8 6.57 756
1989 April 15 9.34 1,200 1942 April 3 6.12 722
1944 August 10 8.12 1,160 1960 April 7 8.18 710
1981 June 29 7.37 1,150 1959 April 6 6.37 702
1951 May 3 7.22 1,110 1991 July 7 5.39 565
1946 March 23 8.09 1,030 1961 April 25 4.88 461
1963 April 4 7.54 966 1977 September 27 4.85 429
1993 July 28 7.20 954 1990 June 22 4.67 393
1945 March 28 6.76 952 1939 April 27 -- 380
1948 April 25 6.80 929
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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
__________________________________________________________________________________________________________________________________
1939 -- -- -- -- -- -- -- 108.7 46.6 30.7 18.5 38.2 --
1940 44.3 47.3 27.6 18.4 19.0 22.8 320.3 333.0 71.6 16.0 13.3 14.1 78.9
1941 21.5 37.3 28.5 28.2 30.3 30.2 388.6 178.5 378.7 161.7 67.6 141.9 123.9
1942 301.3 154.6 50.1 29.7 28.6 128.7 419.6 367.2 60.9 29.5 44.5 255.7 156.2
1943 245.1 85.8 52.9 36.6 26.1 32.3 652.1 512.1 530.1 234.4 115.6 95.8 218.5
1944 72.8 75.3 42.2 28.3 29.8 33.9 150.6 245.0 273.3 218.0 381.6 252.4 150.5
1945 223.0 205.9 136.8 46.9 48.2 350.7 832.7 462.4 133.4 88.3 65.0 121.5 226.6
1946 183.9 100.4 69.0 55.2 41.7 318.0 633.2 226.5 129.2 130.8 44.0 51.8 165.6
1947 150.4 108.3 49.9 44.3 43.6 74.0 630.3 835.3 778.4 269.4 83.6 105.5 264.7
1948 127.0 84.3 69.0 50.9 33.9 38.9 637.8 451.8 55.0 77.4 48.7 34.7 142.4
1949 29.2 42.9 38.8 32.6 28.1 33.5 240.2 209.5 615.3 269.6 412.8 245.0 183.3
1950 122.6 118.7 74.7 59.0 50.2 53.9 525.4 1,974 568.3 433.8 145.2 95.1 354.5
1951 159.5 126.6 80.0 76.0 68.0 72.1 607.4 715.2 157.5 56.2 59.4 181.9 196.9
1952 152.1 106.7 100.9 90.1 76.9 121.8 724.0 273.5 113.3 413.7 104.2 55.5 194.4
1953 45.2 59.3 54.9 47.5 48.0 156.5 312.6 332.3 344.4 344.4 103.4 60.6 159.6
1954 54.8 66.6 80.0 69.6 78.4 103.0 639.3 288.5 186.0 65.2 54.8 60.1 145.1
1955 63.5 62.3 54.5 44.0 37.4 44.1 578.5 158.6 182.3 71.4 30.9 23.6 112.1
1956 47.9 44.8 46.3 47.1 45.4 46.2 533.3 328.5 129.7 55.2 60.1 98.4 123.1
1957 43.7 90.2 39.9 37.2 40.5 111.7 704.2 213.4 916.6 356.2 48.0 138.8 227.3
1958 114.8 135.9 60.2 45.6 42.4 69.7 81.5 74.7 168.9 259.2 37.3 33.3 93.9
1959 49.9 49.8 38.5 35.5 31.0 63.1 223.7 200.9 215.8 97.4 46.3 39.1 91.0
1960 49.0 40.1 41.1 39.2 33.8 37.4 317.1 122.2 174.6 75.5 36.9 54.5 84.7
1961 38.5 52.7 46.6 31.9 26.3 83.7 210.1 218.7 47.1 41.1 29.1 76.5 75.4
1962 65.7 54.6 37.5 30.5 28.9 33.2 502.7 1,151 1,140 671.0 133.2 126.8 332.3
1963 69.7 85.5 70.6 31.2 25.5 133.3 363.2 217.2 382.1 103.7 59.1 45.4 132.1
1964 44.3 45.5 38.6 30.8 31.9 35.1 489.8 314.5 297.3 97.9 37.8 85.6 128.5
1965 106.0 67.0 51.9 42.2 39.8 43.7 1,152 510.0 629.6 109.5 47.0 100.4 240.5
1966 234.7 91.3 74.5 65.6 56.1 272.2 1,391 514.1 127.4 64.0 220.6 113.2 268.7
1967 83.0 80.2 61.8 62.0 58.9 110.7 1,050 558.5 332.7 122.6 37.6 29.9 215.2
1968 48.1 50.6 58.0 44.3 45.3 233.5 243.7 149.7 270.7 613.1 247.4 101.2 176.3
1969 104.3 83.4 69.5 56.0 56.2 80.6 1,086 411.6 275.3 117.2 100.6 75.4 209.1
1970 196.0 139.9 85.6 85.3 68.0 46.7 759.5 638.2 324.4 92.0 44.1 42.2 210.2
1971 80.2 154.4 103.5 76.8 43.0 57.9 463.1 176.4 138.3 89.6 78.0 81.9 128.4
1972 483.1 503.4 101.9 68.3 74.6 212.5 933.4 427.5 140.8 119.1 195.7 85.8 278.5
1973 96.5 103.6 79.5 49.0 43.9 332.5 74.1 54.5 38.5 34.2 187.5 666.4 146.7
1974 407.1 143.4 98.6 78.3 98.4 99.5 1,027 695.5 254.3 57.6 267.6 75.5 275.6
1975 78.8 110.5 86.4 76.7 66.2 70.7 1,094 585.7 218.9 843.7 158.1 98.6 291.5
1976 97.9 121.5 88.8 74.2 71.5 131.8 378.7 31.6 57.6 86.5 100.5 14.4 104.3
1977 25.4 39.7 36.4 34.2 34.0 33.4 26.8 7.52 51.8 164.4 67.9 197.4 59.9
1978 192.6 156.9 139.9 75.6 54.1 58.2 1,169 106.8 95.4 167.1 100.6 100.6 200.7
1979 56.9 46.8 44.0 48.8 68.3 41.6 1,110 392.8 179.6 268.4 229.7 70.8 212.8
1980 50.5 -- -- -- -- -- -- -- -- -- -- -- --
1982 -- -- -- -- -- 127.7 783.1 546.5 156.4 293.1 115.5 45.6 --
1983 228.1 66.3 58.6 55.8 46.1 347.5 297.5 156.1 347.1 265.8 223.0 127.1 185.8
1984 142.5 75.6 68.5 55.3 64.2 170.7 155.9 107.5 464.9 110.2 71.9 26.3 125.8
1985 191.9 156.2 85.2 57.8 44.9 199.1 213.7 498.5 278.0 341.2 506.8 180.6 231.2
1986 201.4 94.8 88.5 66.2 70.4 273.0 599.6 514.6 132.8 182.7 93.6 75.8 200.2
1987 55.7 63.3 69.4 55.0 50.0 127.3 56.7 249.0 115.1 337.4 204.8 92.0 124.0
1988 59.5 51.4 51.8 48.1 47.5 98.7 292.9 66.5 42.0 75.9 74.4 51.8 79.9
1989 48.5 37.9 44.9 68.6 48.8 48.5 513.6 147.8 131.8 99.3 62.8 63.1 109.3
1990 39.0 30.6 24.4 33.4 35.0 40.8 43.6 72.1 172.3 95.7 70.2 26.0 57.0
1991 23.5 23.8 31.8 29.7 29.4 35.7 30.5 31.7 30.1 347.2 95.4 95.8 67.6
1992 37.1 43.9 44.2 35.1 33.4 64.1 155.1 129.3 73.8 301.0 227.5 296.3 120.3
1993 57.6 59.9 57.6 55.5 51.5 108.5 330.1 139.8 203.9 406.3 352.5 124.3 163.0
1994 55.7 51.8 57.6 54.0 53.4 88.6 209.5 293.9 341.4 646.6 159.7 154.6 181.5
1995 139.9 111.7 88.5 68.5 62.0 444.9 208.0 301.6 87.3 344.9 134.2 147.9 179.7
1996 319.5 103.4 64.3 71.4 73.6 84.0 1,340 926.8 218.8 187.0 138.0 51.1 298.0
1997 56.3 113.1 76.6 72.4 71.8 80.1 1,472 281.0 327.3 1,072 154.1 75.0 321.1
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