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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 535 1994 0 m 25.8 88.4 3.43 2.42
November 258 1985 0 m 11.8 38.4 3.26 1.11
December 57.5 1985 0 m 4.87 11.3 2.32 0.46
January 36.0 1987 0 m 2.59 6.51 2.51 0.24
February 53.0 1966 0 m 3.31 8.74 2.64 0.31
March 227 1985 0 m 28.8 53.8 1.87 2.70
April 1,320 1969 0 1942 216 289 1.34 20.2
May 1,310 1969 0.228 1977 260 367 1.41 24.4
June 1,100 1986 0.010 1977 235 304 1.29 22.0
July 1,040 1962 0 m 167 253 1.51 15.6
August 1,180 1993 0 m 74.9 225 3.00 7.02
September 1,060 1993 0 m 37.0 152 4.10 3.47
Annual 360 1994 0.377 1977 89.2 99.4 1.11 100
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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 0.530 0.550 0 0 0 0 0 0 0 0
90 0 0 0 1.60 1.10 0.250 0 0 0 0 0 0 0
85 0 0 0 2.61 1.60 0.720 0.090 0 0 0 0 0 0
80 0 0 0 3.47 2.98 1.50 0.180 0 0 0 0 0 0
75 0 0 0 4.84 4.01 2.10 0.360 0.060 0.040 0 0 0 0
70 0 0 0.020 6.92 6.25 4.64 0.750 0.130 0.080 0.080 0.100 0 0.100
65 0 0 0.220 8.77 8.60 7.30 2.20 0.180 0.170 0.110 0.190 0 0.220
60 0 0 0.620 14.7 13.4 11.4 4.75 0.540 0.240 0.230 0.370 0 0.470
55 0 0 1.20 20.9 24.4 20.3 7.12 1.10 0.480 0.320 0.510 0.030 1.00
50 0 0 2.41 28.7 43.1 38.2 11.1 3.06 0.690 0.460 0.700 0.130 1.50
45 0 0 3.76 46.7 76.6 62.7 21.8 4.27 0.980 0.650 0.970 0.240 3.46
40 0 0 6.12 72.5 128 102 35.7 6.77 2.00 0.920 0.970 0.560 5.50
35 0.160 0 8.57 121 183 175 72.7 11.1 3.11 1.30 1.90 0.750 8.42
30 0.450 0.280 12.5 176 254 284 127 16.9 4.47 2.76 3.54 1.30 13.8
25 1.20 0.640 17.8 252 401 417 208 26.1 6.79 3.90 5.16 3.30 24.9
20 2.70 3.51 25.9 368 594 535 320 43.6 10.3 5.88 7.07 4.55 52.5
15 4.95 6.50 44.3 597 788 658 481 91.0 20.2 14.8 10.2 6.11 114
10 7.87 9.69 74.2 771 945 812 651 153 53.1 55.4 19.4 15.1 289
5 17.1 15.0 138 998 1,100 1,020 870 333 152 112 67.0 29.6 694
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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 17.2 4.29 2.88 1.87 1.14
0.95 1.05 51.0 20.2 15.1 10.9 7.13
0.90 1.11 87.1 42.3 33.5 25.2 17.2
0.80 1.25 160 96.2 80.5 64.1 45.7
0.50 2 454 370 339 395 229
0.20 5 1,110 1,080 1,060 988 841
0.10 10 1,670 1,710 1,730 1,660 1,480
0.04 25 2,470 2,600 2,700 2,660 2,480
0.02 50 3,120 3,290 3,460 3,460 3,330
0.01 100 3,800 3,970 4,230 4,270 4,220
0.005 200 4,490 4,640 4,980 5,080 5,140
0.002 500 5,430 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 0 0 0 0 0 0 0 0 0
0.10 10 0 0 0 0 0 0 0 0 0
0.20 5 0 0 0 0 0 0 0 0 0.065
0.50 2 0 0 0 0 0 0 0.016 0.253 1.18
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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 0 0 0 0 0 0 0 0
0.10 10 0 0 0 0 0 0 0 0.015
0.20 5 0 0 0 0 0 0 0 0.381
0.50 2 0 0 0 0 0 0.073 0.521 3.74
June-July-August September-October-November
_________________________ ___________________________
0.05 20 0 0 0 0 0 0 0 0
0.10 10 0 0 0 0 0 0 0 0
0.20 5 0 0 0 0.094 0 0 0 0
0.50 2 0.111 0.292 0.773 2.42 0 0.045 0.094 0.274
_________________________________________________________________________________________
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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
1942 July 11 -- 845 1969 April1 15.07 3,770
1943 May 24 8.95 1,120 1970 October 14 4.68 102
1944 June 23 9.28 1,080 1971 June 26 5.93 188
1945 April 4 8.10 900 1972 April 10 9.39 776
1946 April 8 7.89 850 1973 March 27 7.00 381
1947 May 1 8.67 975 1974 May 1 4.22 54.0
1948 April 27 8.20 1,020 1975 July 16 8.95 552
1949 July 14 -- 210 1976 March 21 8.60 522
1950 July 8 9.16 1,060 1977 March 13 5.52 27.0
1951 May 16 -- 959 1978 April 19 11.59 929
1952 June 3 10.36 1,410 1979 May 4 10.15 1,030
1953 May 27 -- 187 1980 June 14 6.19 169
1954 September 17 4.67 124 1981 July 19 4.16 27.0
1955 July 11 6.01 152 1982 April 16 8.25 414
1956 August 8 6.94 303 1983 November 29 6.63 150
1957 June 22 9.09 610 1984 April 14 11.00 978
1958 April 16 7.05 418 1985 March 31 9.19 860
1959 July 5 -- 43.0 1986 May 7 12.12 1,820
1960 June 11 7.31 131 1987 October 9 7.71 530
1961 September 14 5.16 125 1988 April 12 5.84 180
1962 August 6 11.52 1,620 1989 April 14 10.72 693
1963 June 18 8.65 945 1990 March 13 4.85 89.0
1964 April 22 5.44 209 1991 July 7 11.14 685
1965 June 9 11.05 1,320 1992 August 1 7.17 139
1966 April 29 8.77 921 1993 August 4 11.52 1,300
1967 April 17 7.33 530 1994 April 8 11.88 1,550
1968 April 23 3.94 58.0
Annual peak discharge, from highest to lowest, and corresponding gage height
1969 April1 15.07 3,770 1978 April 19 11.59 929
1986 May 7 12.12 1,820 1966 April 29 8.77 921
1962 August 6 11.52 1,620 1945 April 4 8.10 900
1994 April 8 11.88 1,550 1985 March 31 9.19 860
1952 June 3 10.36 1,410 1946 April 8 7.89 850
1965 June 9 11.05 1,320 1942 July 11 -- 845
1993 August 4 11.52 1,300 1972 April 10 9.39 776
1943 May 24 8.95 1,120 1989 April 14 10.72 693
1944 June 23 9.28 1,080 1991 July 7 11.14 685
1950 July 8 9.16 1,060 1957 June 22 9.09 610
1979 May 4 10.15 1,030 1975 July 16 8.95 552
1948 April 27 8.20 1,020 1967 April 17 7.33 530
1984 April 14 11.00 978 1986 October 9 7.71 530
1947 May 1 8.67 975 1976 March 21 8.60 522
1951 May 16 -- 959 1958 April 16 7.05 418
1963 June 18 8.65 945 1982 April 16 8.25 414
1973 March 27 7.00 381 1960 June 11 7.31 131
1956 August 8 6.94 303 1961 September 14 5.16 125
1949 July 14 -- 210 1954 September 17 4.67 124
1964 April 22 5.44 209 1969 October 14 4.68 102
1971 June 26 5.93 188 1990 March 13 4.85 89 .0
1953 May 27 -- 187 1968 April 23 3.94 58 .0
1988 April 12 5.84 180 1974 May 1 4.22 54 .0
1980 June 14 6.19 169 1959 July 5 -- 43.0
1955 July 11 6.01 152 1977 March 13 5.52 27 0
1982 November 29 6.63 150 1981 July 19 4.16 27 .0
1992 August 1 7.17 139
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1Day 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]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1942 0 0 0 0 0 0 0 2.52 147.9 623.3 197.7 243.8 102.1
1943 45.7 0.150 0 0 0 5.97 325.3 935.3 680.7 324.3 35.9 6.85 7.7
1944 7.56 11.0 1.38 0 0 3.66 157.0 252.8 598.1 225.0 15.8 4.80 6.1
1945 2.82 1.26 0.097 0 0 15.9 375.2 41.4 214.0 5.87 3.21 1.15 54.5
1946 3.11 1.13 0.274 0 0 28.1 530.5 24.7 13.1 38.7 4.17 2.32 53.4
1947 3.12 10.5 4.44 1.70 0.811 6.16 271.5 592.1 433.4 453.5 9.04 5.98 0.2
1948 6.76 8.36 1.84 0.006 0 36.9 358.7 750.2 84.5 15.4 18.2 15.0 108.5
1949 0.623 0.700 0.219 0 0 19.7 8.26 2.02 2.84 64.9 4.53 1.51 8.91
1950 1.15 1.41 0.016 0 0 4.60 23.1 17.8 575.1 713.0 327.8 19.4 141.3
1951 4.87 20.5 20.0 6.38 1.02 3.88 185.9 820.4 330.7 69.6 29.5 4.94 5.7
1952 4.49 13.0 22.9 20.5 12.7 55.0 259.9 1,002 944.3 260.3 7.52 0.357 217.1
1953 0.426 0.477 0.068 0 0 28.9 9.86 74.0 57.9 60.2 33.4 15.6 23.6
1954 1.85 1.19 0 0 0 2.89 5.56 4.66 6.75 2.00 1.33 2.36 2.38
1955 1.31 0.847 0.084 0 0 4.12 5.91 1.66 2.81 18.1 3.69 0.720 3.30
1956 0.406 0.040 0 0 0 0.013 13.1 3.29 1.35 0.310 5.85 0.283 2.05
1957 0.161 0.697 0.129 0 0 1.20 24.3 235.1 324.4 134.4 14.8 24.8 63.5
1958 33.8 39.0 4.32 13.6 10.8 41.9 223.0 41.5 7.74 6.51 0.206 0.790 35.1
1959 0.123 0 0 0 0 1.50 0.603 1.45 4.36 3.75 0.087 0.003 0.994
1960 0.016 0 0 0 0 1.87 19.1 72.8 68.5 19.6 0.132 0 15.2
1961 0.042 0 0 0 0 1.40 5.37 6.38 .837 0 0.045 1.86 1.33
1962 0 0 0 0 0 0.142 127.5 412.5 788.3 1,035 1,130 259.9 315.5
1963 45.7 7.69 5.48 3.52 8.16 17.6 104.5 42.3 558.4 75.3 8.38 3.73 72.9
1964 1.46 1.15 0.761 0.455 0.217 0.252 107.9 95.1 20.9 5.73 0.397 1.30 19.6
1965 1.17 0.977 0.468 0 0 0 427.2 433.3 1,088 308.6 9.30 5.26 8.9
1966 59.8 84.2 28.9 20.1 53.0 58.8 332.0 729.2 431.0 8.30 6.64 1.15 1.2
1967 23.8 4.02 0 0 0 13.7 223.8 104.8 26.2 199.9 0.765 0.447 50.0
1968 0.342 0.030 0 0 0 0.016 7.61 7.59 3.55 0.694 0.058 0.043 1.66
1969 0.452 0.760 0.403 0.058 0 0 1,322 1,310 374.2 20.6 0.232 0 252.6
1970 1.82 0.310 0 0 0 1.56 14.4 4.30 5.27 0.039 0 0 2.30
1971 0 0.147 0.087 0 0 2.40 4.80 4.80 69.3 23.6 4.40 5.42 9.55
1972 0.448 2.50 1.74 1.58 0.266 100.0 630.9 250.6 303.8 25.5 105.5 18.1 119.4
1973 0.064 0.597 0.678 4.02 8.15 139.2 77.8 17.7 9.37 0.039 0.279 0.047 21.6
1974 0.016 0.001 0 0 0 8.86 8.11 9.56 3.77 0.123 0.349 0.150 2.59
1975 0.015 0.001 0 0 0 0 26.5 183.7 87.1 315.6 12.0 23.4 54.7
1976 1.49 0.256 0.078 0 21.5 221.2 133.8 4.21 0.018 0 0 0.227 31.9
1977 0 0 0 0 0 2.89 1.24 0.228 0.010 0.016 0.009 0.087 0.377
1978 0.212 1.02 0.011 0 0 3.88 623.4 718.8 520.0 415.6 108.2 18.4 201.5
1979 3.34 1.93 1.92 0.640 0.004 0.920 228.2 937.9 695.5 325.9 103.2 8.08 3.4
1980 7.20 7.28 9.09 9.35 11.9 40.7 23.3 25.5 62.2 12.8 1.83 1.47 17.7
1981 1.24 0.327 0.110 0 0.166 0.389 1.99 1.46 10.3 8.08 0.096 0.001 2.01
1982 0 0 0 0 0 3.89 200.5 99.5 3.57 5.43 0.188 0.024 26.0
1983 0.210 5.64 23.2 2.03 0 2.61 2.54 1.93 0.357 0.070 0 0 3.25
1984 0 0.002 0 0 1.94 6.19 716.9 311.8 426.2 281.2 103.8 0.718 153.5
1985 101.3 258.0 57.5 0.200 0.199 227.2 340.0 205.1 420.9 79.7 18.6 19.4 143.9
1986 8.43 5.17 3.66 4.54 6.84 55.3 720.6 1,092 1,103 722.8 151.1 61.9 329.0
1987 362.5 85.5 44.6 36.0 24.5 32.4 64.1 28.2 2.54 1.22 0.271 0.105 57.3
1988 22.4 8.57 4.57 0.310 0.009 9.70 41.7 4.82 0.452 0 0.005 0 7.70
1989 0.053 0.118 0 0 0 1.34 414.1 491.3 89.7 5.13 6.69 71.6 90.2
1990 10.1 11.5 6.57 0 0 21.9 6.98 11.0 8.24 2.12 0.075 1.06 6.68
1991 1.63 1.65 0.594 0.414 0.476 5.11 10.4 14.5 108.3 505.4 71.8 38.4 64.0
1992 58.5 0.830 0.781 0.650 1.38 8.93 10.4 2.93 6.64 22.4 92.4 0.239 17.4
1993 0.080 3.80 4.68 4.82 4.19 75.5 602.7 244.4 240.4 711.4 1,182 1,062 346.0
1994 534.6 20.9 6.57 6.61 7.25 199.0 1,088 1,105 489.7 689.0 139.5 7.22 0.2
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