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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 113 95.8 0.85 5.59
November 503 1972 23.8 1991 91.0 71.2 0.78 4.49
December 140 1978 24.4 1990 63.3 25.6 0.40 3.12
January 90.1 1952 18.4 1940 50.7 17.2 0.34 2.50
February 98.4 1974 19.0 1940 47.0 16.9 0.36 2.32
March 351 1945 22.8 1940 109 89.6 0.82 5.39
April 1,390 1966 26.8 1977 516 347 0.67 25.5
May 1,970 1950 7.52 1977 347 321 0.93 17.1
June 1,140 1962 30.1 1991 254 228 0.90 12.5
July 844 1975 16.0 1940 206 182 0.88 10.2
August 507 1985 13.3 1940 123 107 0.87 6.05
September 666 1973 14.1 1940 106 101 0.95 5.25
Annual 354 1950 57.0 1990 170 70.7 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 25.0 25.7 26.8 33.3 34.4 33.4 28.7 22.1 20.7 26.5 30.5 29.3 26.1
90 29.1 28.5 30.7 53.4 57.6 44.7 42.2 29.3 28.5 34.2 37.9 35.2 32.6
85 32.2 30.3 33.4 73.7 77.8 56.5 51.7 35.8 33.8 40.4 42.7 38.2 37.8
80 35.1 32.1 35.6 91.9 97.2 70.9 59.8 40.9 38.9 43.6 46.0 40.2 42.3
75 37.5 33.6 38.7 123 115 85.6 67.8 44.9 44.1 46.8 49.5 44.0 46.7
70 39.9 35.3 42.8 159 134 98.7 76.3 49.0 50.0 49.7 53.4 46.5 51.0
65 42.4 38.1 45.6 198 155 110 85.6 53.5 55.3 53.2 57.4 50.5 55.3
60 44.7 40.2 48.4 231 174 122 95.5 58.8 61.4 58.5 61.4 53.5 61.7
55 46.6 43.2 51.4 278 194 134 106 65.0 67.7 66.1 66.0 56.2 68.5
50 49.0 45.5 54.7 334 220 148 119 73.3 74.3 72.2 71.2 58.6 76.4
45 52.3 47.4 58.0 393 249 167 136 84.1 81.6 77.6 78.0 60.9 84.7
40 54.6 49.1 63.2 453 284 189 158 98.5 88.9 92.7 85.0 66.4 96.6
35 56.5 50.9 69.7 531 330 216 181 112 96.1 109 92.0 70.6 111
30 59.1 53.8 80.1 626 380 257 208 128 104 127 99.7 74.6 134
25 62.3 57.5 92.9 727 435 309 245 144 115 147 108 78.6 165
20 66.8 62.9 104 828 512 369 293 166 136 167 120 83.7 206
15 72.1 69.0 155 987 618 446 347 204 176 190 135 89.1 280
10 76.5 73.0 277 1,240 773 541 435 273 233 239 166 96.8 399
5 83.6 78.9 464 1,710 1,050 787 634 399 313 315 200 108 644
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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 1.01 311 313 286 227 169
0.95 1.05 484 461 410 328 251
0.90 1.11 611 567 498 400 309
0.80 1.25 806 731 634 510 397
0.50 2 1,360 1,200 1,020 817 637
0.20 5 2,250 1,980 1,660 1,320 1,010
0.10 10 2,920 2,580 2,160 1,700 1,290
0.04 25 3,840 3,440 2,880 2,240 1,660
0.02 50 4,570 4,140 3,470 2,670 1,950
0.01 100 5,340 4,900 4,120 3,140 2,250
0.005 200 6,140 5,720 4,820 3,640 2,570
0.002 500 7,280 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 7.08 8.03 9.19 11.0 13.7 19.5 23.1 26.0 29.8
0.10 10 10.0 11.4 13.2 15.3 18.3 23.4 27.3 30.6 35.4
0.20 5 14.6 16.6 19.2 21.4 24.8 28.7 32.9 36.8 43.5
0.50 2 26.3 29.0 32.7 34.9 38.6 40.7 45.3 50.7 63.7
____________________________________________________________________________________
Probability of occurrence of seasonal low discharges
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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 16.1 19.8 21.3 23.1 8.46 11.1 13.5 17.9
0.10 10 19.8 23.1 24.6 26.6 12.7 16.6 19.2 24.4
0.20 5 24.9 27.7 29.2 31.5 19.6 25.1 27.7 35.1
0.50 2 37.3 38.7 40.1 42.7 37.1 44.9 47.8 67.7
June-July-August September-October-November
_________________________ _________________________
0.05 20 10.9 14.5 17.6 22.0 12.3 15.8 17.6 20.9
0.10 10 14.9 18.8 22.1 27.6 15.8 19.8 22.2 26.4
0.20 5 21.3 25.5 29.0 36.8 21.2 26.0 29.2 34.8
0.50 2 39.3 44.6 49.5 64.7 36.8 43.0 48.0 57.3
_____________________________________________________________________________________
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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
1939 April 27 -- 380 1967 April 3 10.19 2,470
1940 April 16 6.98 840 1968 June 18 11.00 3,000
1941 June 8 6.57 756 1969 April 11 11.89 3,630
1942 April 3 6.12 722 1970 April 26 9.48 2,080
1943 April 21 6.43 800 1971 April 10 8.32 1,520
1944 August 10 8.12 1,160 1972 April 16 10.33 2,550
1945 March 28 6.76 952 1973 September 6 7.98 1,270
1946 March 23 8.09 1,030 1974 April 22 10.31 2,540
1947 June 11 8.34 1,420 1975 July 4 11.19 2,960
1948 April 25 6.80 929 1976 April 1 8.86 1,250
1949 June 1 9.08 1,870 1977 September 27 4.85 429
1950 May 6 11.33 3,630 1978 April 13 11.40 3,270
1951 May 3 7.22 1,110 1979 April 25 12.31 3,940
1952 April 15 8.10 1,440 1980 April 8 6.57 898
1953 July 5 6.23 834 1981 June 29 7.37 1,150
1954 April 13 8.52 1,640 1982 April 16 8.71 1,700
1955 April 6 9.64 1,800 1983 March 7 10.17 1,200
1956 April 21 9.58 2,240 1984 June 9 9.07 1,880
1957 June 27 11.84 3,570 1985 August 19 8.59 1,650
1958 July 6 6.08 822 1986 May 1 8.03 1,430
1959 April 6 6.37 702 1987 July 27 7.62 1,290
1960 April 7 8.18 710 1988 April 7 8.22 900
1961 April 25 4.88 461 1989 April 15 9.34 1,200
1962 June 9 11.90 3,640 1990 June 22 4.67 393
1963 April 4 7.54 966 1991 July 7 5.39 565
1964 April 17 8.57 1,640 1992 August 26 6.60 776
1965 April 12 11.88 3,620 1993 July 28 7.20 954
1966 April 3 10.73 2,000 1994 July 9 9.22 1,440
Annual peak discharge, from highest to lowest, and corresponding gage height
1979 April 25 12.31 3,940 1966 April 3 10.73 2,000
1962 June 9 11.90 3,640 1984 June 9 9.07 1,880
1950 May 6 11.33 3,630 1949 June 1 9.08 1,870
1969 April 11 11.89 3,630 1955 April 6 9.64 1,800
1965 April 12 11.88 3,620 1982 April 16 8.71 1,700
1957 June 27 11.84 3,570 1985 August 19 8.59 1,650
1978 April 13 11.40 3,270 1954 April 13 8.52 1,640
1968 June 18 11.00 3,000 1964 April 17 8.57 1,640
1975 July 4 11.19 2,960 1971 April 10 8.32 1,520
1972 April 16 10.33 2,550 1952 April 15 8.10 1,440
1974 April 22 10.31 2,540 1994 July 9 9.22 1,440
1967 April 3 10.19 2,470 1986 May 1 8.03 1,430
1956 April 21 9.58 2,240 1947 June 11 8.34 1,420
1970 April 26 9.48 2,080 1987 July 27 7.62 1,290
1973 September 6 7.98 1,270 1940 April 16 6.98 840
1976 April 1 8.86 1,250 1953 July 5 6.23 834
1983 March 7 10.17 1,200 1958 July 6 6.08 822
1989 April 15 9.34 1,200 1943 April 21 6.43 800
1944 August 10 8.12 1,160 1992 August 26 6.60 776
1981 June 29 7.37 1,150 1941 June 8 6.57 756
1951 May 3 7.22 1,110 1942 April 3 6.12 722
1946 March 23 8.09 1,030 1960 April 7 8.18 710
1963 April 4 7.54 966 1959 April 6 6.37 702
1993 July 28 7.20 954 1991 July 7 5.39 565
1945 March 28 6.76 952 1961 April 25 4.88 461
1948 April 25 6.80 929 1977 September 27 4.85 429
1988 April 7 8.22 900 1990 June 22 4.67 393
1980 April 8 6.57 898 1939 April 27 -- 380
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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
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