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Last update: Tuesday, 24-Aug-2004 12:38:25 EDT
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Post-regulation period, 1950-97
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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 116 1983 1.29 1956 30.2 32.5 1.08 1.49
November 192 1983 2.19 1956 48.9 45.0 0.92 2.41
December 324 1997 6.27 1956 58.0 58.2 1.00 2.86
January 431 1997 2.66 1956 63.1 74.0 1.17 3.11
February 416 1997 7.17 1956 81.3 91.3 1.12 4.01
March 1,770 1995 10.0 1964 230 362 1.57 11.3
April 2,980 1996 3.19 1953 680 758 1.12 33.5
May 2,980 1950 9.77 1959 396 628 1.59 19.5
June 1,230 1950 8.49 1958 208 225 1.08 10.2
July 501 1994 10.2 1963 124 112 0.90 6.14
August 291 1995 7.94 1963 50.3 64.6 1.28 2.48
September 507 1994 2.29 m 59.2 108 1.83 2.92
Annual 537 1950 22.5 1959 130 115 0.88 100
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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 11.3 8.98 8.64 4.58 10.1 10.0 8.38 2.50 1.60 1.30 7.86 10.1 5.82
90 15.9 14.8 14.2 9.98 13.1 14.4 11.1 6.84 4.70 4.42 11.7 14.6 8.90
85 21.3 18.1 17.8 14.9 15.4 17.4 14.2 9.43 8.65 6.71 13.4 19.5 12.4
80 23.4 21.1 22.2 19.6 17.7 21.0 16.8 11.6 11.3 10.2 14.9 24.7 14.7
75 26.0 23.6 27.1 31.8 24.0 26.5 19.2 13.1 12.9 11.8 16.3 27.3 16.5
70 32.9 27.4 35.1 47.5 35.7 34.8 23.0 14.5 14.6 13.3 17.8 32.5 18.4
65 38.4 31.5 45.4 66.7 54.2 49.9 27.5 15.9 15.8 14.1 20.9 37.2 21.3
60 41.4 38.9 58.3 98.9 74.1 64.7 32.5 17.3 16.9 15.0 24.1 40.1 24.7
55 44.6 44.3 64.7 176 101 81.2 40.9 18.9 17.9 15.8 27.2 43.0 29.3
50 47.8 48.3 71.2 244 135 102 48.9 20.5 19.0 16.7 31.6 46.0 36.2
45 51.0 53.4 86.6 300 178 120 62.0 22.0 20.2 17.8 36.6 49.0 42.6
40 54.3 60.0 106 378 215 139 82.2 23.6 22.6 19.1 42.0 51.3 49.0
35 57.7 64.4 133 506 270 171 108 27.7 25.1 20.5 47.1 53.6 57.3
30 61.1 70.8 173 738 335 213 135 32.9 29.4 21.8 52.0 55.9 67.3
25 67.0 85.4 229 1,000 408 281 180 43.0 35.5 26.3 60.5 58.8 86.3
20 77.4 107 268 1,240 529 333 230 71.6 44.8 37.2 82.1 68.4 119
15 93.2 152 317 1,550 746 395 281 102 83.8 44.9 98.8 88.0 176
10 105 224 480 2,070 949 484 344 152 127 67.5 117 108 279
5 147 322 960 3,070 1,830 634 446 237 299 112 151 151 506
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Probability of annual high discharges
[ng, statistic not given]
__________________________________________________________________________________________________
Maximum average discharge
(ft3/s)1
___________________________________________________________
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 65.1 35.5 24.3 17.7 16.7
0.95 1.05 182 111 80.6 58.4 48.4
0.90 1.11 299 192 144 105 82.4
0.80 1.25 520 353 276 203 152
0.50 2 1,300 964 824 629 444
0.20 5 2,720 2,160 2,030 1,640 1,150
0.10 10 3,750 3,070 3,030 2,540 1,800
0.04 25 5,050 4,240 23,940 23,230 22,330
0.02 50 5,980 5,080 24,720 23,870 22,790
0.01 100 6,860 5,890 25,480 24,490 23,230
0.005 200 7,690 6,650 26,180 25,070 23,650
0.002 500 8,710 ng ng ng ng
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1Statistics computed using period of daily value record 1950-75.
2 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
_____________________________________________________________________________________
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
1919 April 18 14.90 2,750 1966 March 28 14.27 3,350
1938 March 29 3.90 244 1967 April 10 9.03 1,570
1939 April 6 4.34 342 1968 June 13 8.48 1,220
1940 April 8 5.14 525 1969 April 19 17.62 4,520
1941 April 19 9.10 1,590 1970 April 20 8.47 1,370
1942 April 17 7.72 1,190 1971 April 21 10.27 1,820
1943 March 27 10.78 1,900 1972 April 16 7.23 1,070
1944 June 3 4.50 399 1973 March 14 6.32 761
1945 March 24 7.06 1,020 1974 April 22 10.74 2,160
1946 March 26 7.56 1,160 1975 June 30 10.27 1,960
1947 April 11 10.19 1,910 1980 August 29 7.00 765
1948 April 28 17.51 4,580 1981 April 2 5.91 542
1949 April 21 10.90 2,120 1982 April 14 10.95 1,990
1950 May 5 14.60 3,050 1983 March 13 11.26 2,030
1951 April 19 8.08 1,270 1984 April 6 10.43 1,950
1952 March 31 6.02 650 1985 May 17 6.37 680
1953 July 17 8.11 1,230 1986 April 19 11.04 2,100
1954 July 13 6.29 726 1987 April 13 11.43 2,300
1955 April 14 9.04 1,490 1988 February 28 4.80 150
1956 April 28 10.58 1,870 1989 March 30 8.38 850
1957 September 4 6.48 627 1990 July 11 4.59 278
1958 July 17 4.21 248 1991 August 24 3.37 77.0
1959 June 27 7.02 988 1992 March 8 8.59 1,260
1960 April 17 9.52 1,570 1993 July 28 17.30 3,830
1961 March 2 4.01 251 1994 April 9 9.00 1,530
1962 July 7 9.71 1,270 1995 March 29 16.57 4,120
1963 July 26 3.39 78.0 1996 April 21 18.78 5,250
1964 June 28 6.56 643 1997 April 19 18.01 4,810
1965 April 16 14.93 3,080
Annual peak discharge, from highest to lowest, and corresponding gage height
1996 April 21 18.78 5,250 1983 March 13 11.26 2,030
1997 April 19 18.01 4,810 1982 April 14 10.95 1,990
1948 April 28 17.51 4,580 1975 June 30 10.27 1,960
1969 April 19 17.62 4,520 1984 April 6 10.43 1,950
1995 March 29 16.57 4,120 1947 April 11 10.19 1,910
1993 July 28 17.30 3,830 1943 March 27 10.78 1,900
1966 March 28 14.27 3,350 1956 April 28 10.58 1,870
1965 April 16 14.93 3,080 1971 April 21 10.27 1,820
1950 May 5 14.60 3,050 1941 April 19 9.10 1,590
1919 April 18 14.90 2,750 1960 April 17 9.52 1,570
1987 April 13 11.43 2,300 1967 April 10 9.03 1,570
1974 April 22 10.74 2,160 1994 April 9 9.00 1,530
1949 April 21 10.90 2,120 1955 April 14 9.04 1,490
1986 April 19 11.04 2,100 1970 April 20 8.47 1,370
1951 April 19 8.08 1,270 1952 March 31 6.02 650
1962 July 7 9.71 1,270 1964 June 28 6.56 643
1992 March 8 8.59 1,260 1957 September 4 6.48 627
1953 July 17 8.11 1,230 1981 April 2 5.91 542
1968 June 13 8.48 1,220 1940 April 8 5.14 525
1942 April 17 7.72 1,190 1944 June 3 4.50 399
1946 March 26 7.56 1,160 1939 April 6 4.34 342
1972 April 16 7.23 1,070 1990 July 11 4.59 278
1945 March 24 7.06 1,020 1961 March 2 4.01 251
1959 June 27 7.02 988 1958 July 17 4.21 248
1989 March 30 8.38 850 1938 March 29 3.90 244
1980 August 29 7.00 765 1988 February 28 4.80 150
1973 March 14 6.32 761 1963 July 26 3.39 78.0
1954 July 13 6.29 726 1991 August 24 3.37 77.0
1985 May 17 6.37 680
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Monthly and annual mean discharges, in cubic feet per second
[Data wee 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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1919 -- -- -- -- -- -- 1,580 -- -- -- -- -- --
1938 -- -- -- -- -- -- 45.3 26.6 8.43 -- 8.64 0.130 --
1939 0.223 0.213 0.158 0.252 0.332 67.7 114.5 21.1 14.6 1.65 0.026 0.010 18.4
1940 0.048 0 0 0 0 0 172.1 62.0 8.50 0.316 1.72 0.063 20.2
1941 0.048 0 0.016 0 0 68.0 953.3 116.8 131.7 59.8 18.0 44.4 115.1
1942 51.9 38.9 21.6 4.03 5.22 26.7 736.6 239.5 162.9 55.7 49.5 45.6 119.4
1943 25.0 23.9 10.8 9.56 20.0 470.0 904.2 186.6 406.8 130.7 39.7 8.00 186.0
1944 3.64 18.8 12.0 3.86 4.53 15.6 109.1 74.1 161.4 62.6 74.5 100.0 53.1
1945 21.3 54.7 31.0 10.4 12.4 447.6 168.0 91.2 79.4 26.5 25.8 12.1 82.3
1946 8.51 14.6 9.75 10.1 5.06 411.7 380.8 70.1 36.9 46.2 46.6 20.3 88.8
1947 35.5 24.7 11.5 15.3 8.61 230.9 629.5 87.1 95.2 35.5 12.8 1.59 98.8
1948 23.9 15.4 14.9 8.19 4.98 32.0 2,077 959.8 98.2 54.5 40.5 10.5 276.8
1949 0.790 26.1 10.8 6.25 7.20 80.7 1,254 188.3 103.4 100.5 3.03 1.23 147.5
1950 3.02 27.5 21.9 11.0 9.16 77.1 1,746 2,975 1,231 253.7 66.4 2.29 537.4
1951 13.2 30.7 26.6 25.9 24.0 73.2 555.9 325.5 95.3 47.2 22.3 27.5 105.5
1952 51.3 14.5 14.7 23.4 28.8 49.2 32.4 19.3 22.0 21.1 24.2 21.1 26.9
1953 15.1 11.9 13.7 23.1 36.2 18.2 3.19 22.2 112.0 133.1 9.22 12.3 34.2
1954 19.3 20.1 38.8 58.6 62.6 78.1 138.1 40.6 175.1 233.6 33.6 50.8 79.1
1955 41.7 99.9 98.5 84.3 33.4 23.3 253.5 69.3 255.8 229.5 17.1 2.29 100.7
1956 1.29 2.19 6.27 2.66 7.17 67.0 357.4 366.5 286.8 54.1 14.5 2.61 97.2
1957 7.19 38.0 52.5 54.7 63.4 45.4 17.0 33.9 64.8 46.5 43.5 289.2 62.6
1958 102.8 125.4 83.8 77.8 73.1 66.1 50.1 20.9 8.49 76.3 13.2 14.5 59.4
1959 17.0 28.4 39.8 38.9 33.7 29.0 9.97 9.77 29.9 14.1 9.84 9.93 22.5
1960 12.4 16.1 26.4 21.4 20.1 75.3 695.6 82.0 160.0 26.0 20.7 15.8 96.7
1961 12.6 27.8 45.1 43.3 36.5 31.1 13.7 13.1 14.3 15.2 11.7 15.9 23.3
1962 15.9 13.7 13.5 13.8 13.8 122.6 316.4 148.5 245.2 171.7 36.3 20.6 94.4
1963 18.7 40.2 50.7 50.2 48.7 37.2 13.4 13.2 18.8 10.2 7.94 10.9 26.6
1964 6.65 22.7 34.0 23.5 15.8 10.0 25.5 11.9 200.2 138.4 16.4 28.1 44.3
1965 29.4 50.7 50.5 53.9 48.1 149.5 1,411 225.6 108.8 208.3 1,45.2 78.3 212.5
1966 115.7 104.3 104.0 101.9 76.2 1,229 707.8 307.4 204.8 167.8 2,15.5 67.3 285.3
1967 16.8 43.9 75.9 68.1 154.1 206.6 1,012 512.1 56.8 27.7 17.5 17.8 183.3
1968 16.4 24.3 41.9 40.5 42.1 65.5 157.8 145.2 265.7 31.7 17.4 19.0 72.0
1969 20.7 59.9 51.6 63.1 208.2 186.1 2,091 333.8 97.5 156.1 16.9 18.1 272.6
1970 13.6 38.5 47.5 53.5 85.0 143.2 473.2 319.2 359.5 33.3 14.2 11.3 132.1
1971 13.9 24.0 39.4 37.3 119.7 263.3 691.3 167.5 234.1 192.1 25.9 25.2 152.1
1972 49.3 132.2 154.7 119.3 45.2 269.3 876.3 319.7 191.0 25.1 20.5 22.6 184.9
1973 19.2 45.7 50.2 55.3 64.0 103.3 36.9 16.9 14.7 10.5 18.9 19.1 37.8
1974 18.0 31.0 34.5 63.4 198.9 245.4 1,008 727.1 508.0 18.3 18.1 13.0 239.0
1975 12.7 36.5 54.2 54.5 58.6 72.6 759.5 915.1 254.8 167.5 57.9 20.3 205.9
1982 -- -- -- -- -- -- -- -- -- 168.5 44.9 15.0 --
1983 116.0 191.9 84.5 87.0 -- -- -- -- -- -- -- -- --
1985 -- -- -- -- -- -- -- -- -- -- -- -- --
1987 -- -- -- -- -- -- 1,429 -- -- -- -- -- --
1990 -- -- 24.7 18.4 16.5 15.8 -- -- -- -- -- -- --
1991 -- -- -- -- -- -- -- -- -- -- -- -- --
1992 17.7 26.8 60.5 50.3 41.3 437.9 -- -- -- 64.0 31.7 39.0 --
1993 20.9 14.1 35.2 106.1 138.5 278.4 283.4 130.2 115.2 -- -- 274.7 --
1994 96.8 125.1 -- -- 300.2 447.9 710.4 177.0 307.8 500.7 137.5 507.0 --
1995 -- -- -- -- -- 1,771 2,214 866.4 280.1 246.1 290.8 196.0 --
1996 -- -- -- -- -- 520.0 2,982 1,116 299.0 249.5 110.6 27.7 --
1997 21.2 -- 323.7 430.6 415.7 374.9 -- 1,839 231.8 245.9 78.6 -- --
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