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Last update: Wednesday, 23-Feb-2005 09:45:42 EST
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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 62.9 1983 0 m 7.19 13.4 1.86 0.85
November 46.5 1972 0 m 7.12 9.49 1.33 0.84
December 31.1 1994 0 m 5.03 6.63 1.32 0.59
January 23.2 1994 0 m 3.11 4.22 1.36 0.37
February 16.1 1954 0 m 3.41 4.40 1.29 0.40
March 1,110 1966 0 1940 139 215 1.55 16.4
April 2,880 1979 6.51 1938 428 577 1.35 50.5
May 2,280 1950 1.12 1939 107 292 2.73 12.6
June 385 1968 1.35 1938 59.4 74.1 1.25 7.02
July 729 1993 0 1940 49.7 123 2.47 5.87
August 515 1993 0 m 22.2 73.3 3.30 2.63
September 326 1994 0 m 16.3 50.1 3.08 1.92
Annual 395 1950 3.47 1937 72.8 77.6 1.07 100
__________________________________________________________________________________________________________
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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 0 0 0 5.75 2.30 0.97 0.06 0 0 0 0 0 0
90 0 0 0.10 9.72 4.67 1.70 0.27 0 0 0 0 0 0.08
85 0.09 0.10 0.35 16.1 6.36 3.61 0.56 0.09 0.08 0.08 0.18 0.17 0.19
80 0.17 0.18 0.49 22.6 7.76 4.76 0.81 0.29 0.16 0.17 0.24 0.17 0.45
75 0.17 0.27 0.92 28.3 10.7 6.30 1.70 0.60 0.23 0.28 0.40 0.37 0.70
70 0.36 0.40 1.30 33.8 13.8 8.69 2.73 0.87 0.33 0.36 0.68 0.53 1.10
65 0.45 0.48 1.70 43.7 16.1 11.3 3.72 0.87 0.47 0.47 0.88 0.77 1.60
60 0.57 0.59 2.40 55.5 19.8 14.1 5.22 1.30 0.66 0.60 1.50 1.30 2.55
55 0.73 0.88 4.08 68.5 23.8 16.5 6.71 1.30 0.94 0.77 2.00 1.60 3.82
50 1.20 1.60 4.96 88.2 28.1 19.9 9.00 1.80 1.30 0.98 2.50 2.30 5.01
45 1.50 1.90 6.45 115 33.8 24.9 11.7 1.80 1.30 1.30 4.45 2.80 6.45
40 2.40 2.30 9.70 153 40.5 32.6 14.0 3.43 1.90 1.60 5.26 3.40 8.39
35 3.00 3.50 16.5 207 50.5 43.0 16.7 4.54 1.90 2.70 6.20 3.40 11.9
30 3.00 4.30 31.0 275 64.0 54.0 22.5 6.46 3.36 4.63 7.82 5.38 16.6
25 4.45 4.99 60.1 371 84.6 66.3 31.1 8.49 4.65 6.20 9.23 6.50 22.8
20 5.18 5.59 101 525 109 82.9 42.2 11.1 8.53 9.34 13.0 7.79 35.2
15 6.43 6.16 180 774 146 106 57.9 16.5 14.8 14.3 16.0 11.6 59.2
10 8.65 7.78 359 1,170 212 146 83.5 28.9 31.2 22.0 20.4 15.8 108
5 11.8 14.1 876 2,040 363 232 139 112 61.7 39.4 29.2 20.0 275
______________________________________________________________________________________________________________________
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Probability of occurrence of annual high discharges
[ng, statistic not given]
__________________________________________________________________________________________________
Maximum mean 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 21.3 17.1 15.6 11.8 9.25
0.95 1.05 78.2 69.7 59.6 43.3 30.5
0.90 1.11 148 137 115 81.8 55.0
0.80 1.25 307 292 238 167 108
0.50 2 1,070 1,020 819 561 347
0.20 5 3,110 2,840 2,280 1,540 960
0.10 10 5,080 4,440 3,600 2,430 1,540
0.04 25 8,160 6,720 5,540 3,750 2,440
0.02 50 10,800 8,510 7,120 4,820 3,220
0.01 100 13,700 10,300 8,750 5,940 4,070
0.005 200 16,800 12,100 10,400 7,090 4,980
0.002 500 21,100 ng ng ng ng
__________________________________________________________________________________________________
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Probability of occurrence of annual low discharges
____________________________________________________________________________________
Minimum mean 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 0 0 0 0 0 0 0 0 0.014
0.10 10 0 0 0 0 0 0 0 0.016 0.176
0.20 5 0 0 0 0 0 0.088 0.185 0.281 0.453
0.50 2 0.071 0.083 0.142 0.207 0.310 0.620 0.961 1.43 1.97
____________________________________________________________________________________
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Probability of occurrence of seasonal low discharges
_____________________________________________________________________________________
Minimum mean 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 0 0 0 0 0 0 0 0.463
0.10 10 0 0 0 0 0 0 0.016 1.04
0.20 5 0 0 0.063 0.087 0.126 0.201 0.399 2.50
0.50 2 0.708 0.741 0.773 0.906 1.38 1.76 2.48 11.3
June-July-August September-October-November
___________________________ ___________________________
0.05 20 0 0 0 0.007 0 0 0 0
0.10 10 0 0 0 0.098 0 0 0 0
0.20 5 0.028 0.061 0.130 0.319 0 0 0.021 0.119
0.50 2 0.614 0.837 1.16 2.02 0.194 0.350 0.440 0.746
_____________________________________________________________________________________
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Annual peak discharge and corresponding gage height
[--, 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
11882 April2 -- 6,700 1961 March 7 0.66 82.0
11897 April2 -- 5,700 1962 April 9 8.64 2,350
11904 April2 -- 5,300 1963 April 8 1.24 290
11916 April2 -- 4,700 1964 June 14 3.61 1,110
1931 April 7 4.20 100 1965 April 13 14.01 6,800
1932 March 3 15.14 959 1966 March 23 12.17 3,290
1933 March2 10.40 300 1967 April 24 7.81 2,650
1934 April 2 4.95 107 1968 June 12 4.48 1,420
1935 June 14 8.45 697 1969 April 12 14.19 7,640
1936 April 16 13.06 1,660 1970 April 9 9.18 3,040
1937 April 15 3.57 46.0 1971 April 10 4.41 1,550
1938 March 15 4.44 104 1972 April 15 6.62 2,380
1939 March 26 11.00 564 1973 March 15 4.05 1,280
1940 April 17 1.66 710 1974 April 15 9.43 3,450
1941 April 11 2.26 1,320 1975 April 19 11.11 3,810
1942 April 6 2.27 1,140 1976 March 29 3.98 1,260
1943 March 29 8.84 3,480 1977 April 11 2.01 86.0
1944 April 10 1.11 304 1978 April 1 10.56 3,800
1945 March 17 1.09 293 1979 April 21 16.76 14,800
1946 March 22 3.22 1,300 1980 March 31 3.55 790
1947 April 13 5.30 1,700 1981 June 25 1.83 25.6
1948 April 16 10.63 4,180 1982 April 3 8.89 2,900
1949 April 8 3.38 1,640 1983 March 17 -- 1,140
1950 April 19 14.94 9,420 1984 March 29 7.99 2,660
1951 March 31 3.48 1,130 1985 March 16 4.17 1,240
1952 April 4 3.33 1,300 1986 March 24 4.81 1,630
1953 July 6 1.36 408 1987 March 26 10.22 3,570
1954 June 15 0.99 231 1988 March 28 3.86 1,060
1955 April 3 2.44 1,220 1989 April 8 9.80 3,000
1956 April 19 2.58 1,390 1990 April 6 2.01 94.0
1957 September 7 1.17 200 1991 June 1 2.75 351
1958 July 3 0.69 88.0 1992 March 8 3.69 975
1959 April 5 0.84 143 1993 July 30 12.90 4,360
1960 April 9 3.37 1,360 1994 March 23 6.91 2,160
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 21 16.76 14,800 1948 April 16 10.63 4,180
1950 April 19 14.94 9,420 1975 April 19 11.11 3,810
1969 April 12 14.19 7,640 1978 April 1 10.56 3,800
1965 April 13 14.01 6,800 1987 March 26 10.22 3,570
11882 April2 -- 6,700 1943 March 29 8.84 3,480
11897 April2 -- 5,700 1974 April 15 9.43 3,450
11904 April2 -- 5,300 1966 March 23 12.17 3,290
11916 April2 -- 4,700 1970 April 9 9.18 3,040
1993 July 30 12.90 4,360 1989 April 8 9.80 3,000
1982 April 3 8.89 2,900 1988 March 28 3.86 1,060
1984 March 29 7.99 2,660 1992 March 8 3.69 975
1967 April 24 7.81 2,650 1932 March 3 15.14 959
1972 April 15 6.62 2,380 1980 March 31 3.55 790
1962 April 9 8.64 2,350 1940 April 17 1.66 710
1994 March 23 6.91 2,160 1935 June 14 8.45 697
1947 April 13 5.30 1,700 1939 March 26 11.00 564
1936 April 16 13.06 1,660 1953 July 6 1.36 408
1949 April 8 3.38 1,640 1991 June 1 2.75 351
1986 March 24 4.81 1,630 1944 April 10 1.11 304
1971 April 10 4.41 1,550 1933 March2 10.40 300
1968 June 12 4.48 1,420 1945 March 17 1.09 293
1956 April 19 2.58 1,390 1963 April 8 1.24 290
1960 April 9 3.37 1,360 1954 June 15 0.99 231
1941 April 11 2.26 1,320 1957 September 7 1.17 200
1946 March 22 3.22 1,300 1959 April 5 0.84 143
1952 April 4 3.33 1,300 1934 April 2 4.95 107
1973 March 15 4.05 1,280 1938 March 15 4.44 104
1976 March 29 3.98 1,260 1931 April 7 4.20 100
1985 March 16 4.17 1,240 1990 April 6 2.01 94.0
1955 April 3 2.44 1,220 1958 July 3 0.69 88.0
1942 April 6 2.27 1,140 1977 April 11 2.01 86.0
1983 March 17 -- 1,140 1961 March 7 0.66 82.0
1951 March 31 3.48 1,130 1937 April 15 3.57 46.0
1964 June 14 3.61 1,110 1981 June 25 1.83 25.6
_____________________________________________________________________________________
1Determined by U.S. Army Corps of Engineers; not used in statistics.
2Day of month unknown.
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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
__________________________________________________________________________________________________________________________________
1931 -- -- -- -- -- -- 26.8 3.56 4.24 1.27 1.33 0.330 --
1932 0.300 0.200 0.200 0.200 20.0 272.2 238.6 27.4 12.6 0.984 0.294 0.390 47.8
1933 0.526 -- -- -- -- -- 105.7 16.5 6.01 -- -- -- --
1934 -- -- -- -- -- -- 33.1 2.05 2.75 1.24 1.45 2.77 --
1935 0.700 0.200 0.200 0.200 0.300 70.0 32.0 19.9 86.0 12.0 1.00 0.400 18.6
1936 0.300 0.400 0.200 0.200 0.200 1.00 190.4 14.1 2.77 0.577 0.100 0.100 17.3
1937 0.100 0.100 0.100 0.100 0.200 0.500 15.4 7.49 9.65 2.43 3.73 2.00 3.47
1938 0.100 0.100 0.100 0.100 0.100 35.1 6.51 5.35 1.35 0.013 0 0 4.12
1939 0 0 0 0 0 99.0 37.5 1.12 9.02 0.119 0 0 12.3
1940 0 0 0 0 0 0 156.3 9.05 1.63 0 4.69 0.013 14.1
1941 0 0 0 0 0 24.5 517.2 14.0 61.4 6.93 1.26 2.53 51.7
1942 6.06 5.24 2.33 0.074 0 9.25 256.9 81.1 31.4 6.05 3.55 2.72 33.6
1943 0.916 0.820 0.742 0.445 0.321 215.0 122.0 33.3 91.4 21.5 2.12 0.457 40.9
1944 0.232 0.407 0.297 0.174 0.121 2.02 65.5 16.6 21.2 5.72 39.0 12.7 13.6
1945 2.87 13.5 5.60 0.661 0.643 98.5 40.5 18.2 17.1 5.98 1.30 1.09 17.3
1946 1.66 0.527 0.510 0.471 0.557 209.8 51.6 16.0 9.11 8.85 0.542 0.837 25.3
1947 1.36 1.46 0.671 0.216 0.139 121.5 394.7 38.3 52.0 9.17 1.94 0.887 51.6
1948 0.768 2.19 1.46 0.452 0.100 0.532 1,840 148.0 23.2 15.6 9.90 0.950 168.0
1949 0.445 3.78 1.61 0.458 0.257 1.14 516.2 37.9 158.9 18.6 12.5 1.11 62.1
1950 3.23 6.61 4.96 2.69 2.37 45.1 2,168 2,275 135.0 57.9 12.0 7.18 394.5
1951 6.08 7.88 7.35 6.27 5.81 92.1 289.3 27.4 14.4 3.61 1.58 4.29 38.7
1952 2.64 4.43 1.86 0 1.84 14.2 328.0 11.2 1.43 131.4 9.13 1.41 42.1
1953 1.08 2.05 2.73 1.88 1.92 28.4 21.8 28.6 135.7 101.6 2.17 2.86 27.6
1954 0.765 2.45 2.96 2.55 16.1 57.8 61.2 19.3 41.2 4.69 0.697 0.350 17.4
1955 0.200 0.260 0.297 0.568 0.700 0.981 214.6 6.35 61.7 5.66 2.58 0.163 24.2
1956 0.200 0.483 0.635 0.581 0.500 0.706 281.7 55.4 57.3 6.05 0.994 0.967 33.4
1957 0.384 1.82 1.43 0.994 0.739 18.3 17.8 7.88 10.5 5.30 0.106 53.0 9.81
1958 16.5 14.8 4.20 0.961 0.814 1.57 15.8 4.87 3.15 29.0 3.52 0.460 8.03
1959 0.319 0.050 0 0 0 33.6 37.2 6.70 6.81 0.484 1.33 0.293 7.24
1960 0.339 0.667 0.910 0.877 0.803 71.8 435.5 15.0 12.7 10.2 4.13 1.61 45.7
1961 0.258 1.05 0.984 0.768 0.818 54.4 26.9 19.6 3.47 0.158 0.081 0.403 9.15
1962 2.45 0.690 0.606 0.568 0.521 0.848 690.0 179.0 146.1 48.0 11.0 122.8 99.5
1963 16.5 14.4 9.10 2.32 0.296 29.3 89.0 18.4 10.5 11.8 2.08 0.350 17.0
1964 0.858 0.557 0.116 0 0 1.52 149.8 18.5 275.6 29.7 5.31 8.27 40.3
1965 26.6 7.42 3.72 3.00 1.84 1.38 1,632 171.5 69.8 67.9 23.4 36.2 168.9
1966 50.2 27.5 17.5 10.8 6.86 1,106 473.3 164.5 88.1 118.3 132.2 18.6 186.3
1967 9.56 10.5 4.47 4.76 3.90 282.9 946.0 403.1 97.7 17.1 2.18 1.04 148.5
1968 1.96 3.74 3.37 4.22 2.38 119.3 52.2 34.9 385.2 53.5 19.2 12.8 57.4
1969 7.52 11.8 7.88 3.97 3.56 5.79 1,585 133.3 80.1 73.6 14.9 31.8 161.7
1970 27.5 15.5 14.5 10.3 10.9 13.3 1,186 316.3 265.2 38.6 8.58 8.89 158.6
1971 3.56 13.4 7.54 3.57 4.96 78.9 489.7 65.5 69.4 62.0 6.63 4.07 67.1
1972 30.2 46.5 16.1 7.39 4.93 421.6 764.4 235.8 97.0 11.3 6.79 2.71 136.8
1973 1.09 6.75 3.96 3.67 5.97 275.4 50.5 18.5 12.2 3.62 1.78 4.41 32.7
1974 9.89 8.66 4.77 1.33 3.06 2.44 1,068 284.7 183.9 37.8 40.9 6.06 136.8
1975 1.63 5.89 7.45 6.91 6.18 26.7 919.9 243.0 89.4 58.6 2.84 2.22 113.6
1976 1.00 4.69 3.58 3.86 5.05 235.3 230.1 23.0 6.47 1.14 0.061 0 42.9
1977 0 0 0.232 0.300 0.296 2.26 17.6 9.72 5.06 4.18 0.145 1.96 3.48
1978 4.25 12.7 6.63 4.06 2.06 302.9 961.8 78.4 34.7 9.93 1.32 5.44 118.2
1979 1.04 1.02 1.62 1.70 2.05 3.14 2,878 421.1 71.7 44.3 15.1 3.22 284.4
1980 4.32 6.74 8.45 5.02 4.73 55.3 215.4 9.76 2.65 0.437 1.48 2.25 26.2
1981 0.782 2.43 2.40 2.16 4.85 9.88 6.61 7.48 14.4 7.64 8.15 2.76 5.79
1982 4.89 7.84 11.0 5.23 4.19 80.6 816.7 64.3 19.1 18.8 1.60 0.415 85.5
1983 62.9 20.7 22.0 8.96 8.00 418.6 230.9 57.1 129.6 62.7 29.0 44.3 91.8
1984 26.5 25.7 15.3 8.42 7.06 403.2 402.0 83.0 114.5 4.14 0.058 0 90.8
1985 5.90 4.50 0.672 0.828 2.40 344.5 75.6 40.7 13.7 0.581 19.0 0.814 43.0
1986 4.06 5.17 5.55 6.08 5.31 391.3 265.5 217.9 41.8 46.7 7.45 4.94 84.2
1987 14.4 15.1 18.0 12.7 6.81 922.9 1,043 147.8 102.5 532.5 160.1 50.0 253.6
1988 15.4 25.0 22.5 12.4 13.9 349.1 248.7 37.5 13.5 4.52 0.780 0.537 62.1
1989 0.735 2.50 3.76 4.58 4.16 6.46 789.4 51.7 20.8 3.15 1.32 1.44 73.3
1990 0.568 0.492 0.190 0.842 1.21 2.57 23.7 10.5 8.65 13.9 4.24 0 5.58
1991 0 0.006 0 0.275 2.94 7.20 23.6 80.2 47.8 8.91 0.547 0 14.3
1992 0.021 2.01 1.57 0.374 0.210 274.9 29.4 12.3 10.7 108.0 13.8 18.2 39.8
1993 6.43 16.5 9.15 3.95 5.31 157.8 223.4 42.7 48.4 729.1 515.0 200.0 164.9
1994 55.0 36.2 31.1 23.2 16.9 555.4 250.9 164.6 142.0 426.2 221.9 326.1 188.8
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