Country= U.S.A. Station= SHEPHERDSTOWN, WV River= POTOMAC R Area= 15373.33 Lat= 39.43 Lon= -77.8 Source= USGS PointID= 1618000 Area Units= km2 Discharge Units= m3/sec Starting Year= 1918 Ending Year= 1995 Total Years= 78 Total Usable Years= 77 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Avg Annual 1918 133.04 134.08 145.06 238.08 293.39 300.76 113.47 70.68 55.16 51.98 105.91 115.46 146.42 1919 125.79 130.11 138.63 273.53 204.74 146.48 121.11 107.21 91.95 91.99 134.77 140.55 142.24 1920 137.54 133.55 182.32 366.81 178.92 127.98 123.7 73.79 66.47 67.34 98.15 111.59 139.01 1921 120.5 125.85 143.06 199.82 213.49 125.68 67.24 43.31 39.87 42.08 82.94 89.64 107.79 1922 101.31 102.95 177.93 465.18 338.25 189.15 120.64 102.51 82.62 85.07 87.64 97.55 162.57 1923 128.39 134.58 164.27 259.14 233.6 129.68 89.86 52.8 55.87 64.97 70.08 91.93 122.93 1924 107.23 115.7 120.92 221.22 344 154.2 126.63 272.49 159.75 129.21 118.35 118.83 165.71 1925 126.22 122.46 128.71 73.66 72.34 113.36 139.11 86.14 60.05 80.21 97.84 106.28 100.53 1926 106.65 105.84 98.25 145.35 187.16 195.61 122.18 81.87 111.43 171.39 139.26 129.29 132.86 1927 151.7 137.33 186.37 204.11 192.37 172.21 108.16 86.55 58.62 113.88 136.13 130.43 139.82 1928 128.73 151.05 223.06 372.84 161.17 120.41 93.88 74.49 130.61 185.9 183.75 147.84 164.48 1929 158.11 189.33 307.49 548.12 315.74 132.9 137.22 115.94 96.01 71.85 90 98.84 188.46 1930 116.73 127.23 144.99 118.89 122.95 112.97 78.77 35.55 29.88 30.59 35.16 69.09 85.23 1931 70.08 68.46 67.19 62.3 35.69 31.08 27.84 25.9 30.38 53.04 71.05 90.58 52.8 1932 120.22 165.05 150.35 101.16 119.24 97.83 53.41 25.92 22.62 20.62 53.87 70.84 83.43 1933 68.37 78.63 104.47 151.93 183.08 108.2 58.64 33.16 20.07 24.9 45.26 64.01 78.39 1934 65.5 62.07 58.86 94.87 84.44 41.03 45.3 26.47 33.67 46.49 73.65 121.84 62.85 1935 100.71 114.45 182.53 216.43 147.62 111.89 99.89 87.27 73.27 69.77 70.71 72.16 112.23 1936 86.17 99.68 119.55 124.76 118.68 91.4 37.21 21.56 24.68 51.43 67.45 63.2 75.48 1937 86.19 109.11 153.02 141.18 205.99 106.12 62.59 31.89 30.06 30.02 61.16 82.56 91.66 1938 88.9 155.93 221.8 232.89 147.49 111.85 126 116.46 311.97 253.25 112.65 110.56 165.81 1939 165.08 221.74 135.4 231.92 130.53 107.65 92.61 61.77 62.11 66.33 71.42 83.73 119.19 1940 82.43 85.05 94.45 70.2 81.93 188.98 174.4 143.59 136.13 77.56 93.04 119.45 112.27 1941 188.11 146.83 102.6 231.6 125.04 131.62 79.46 48.81 72.15 142.38 221.71 136.55 135.57 1942 136.94 118.88 131.76 145.46 235.09 372.4 119.63 104.49 97.68 144.64 132.9 112.86 154.39 1943 111.69 129.31 174.37 273.89 141.13 292.98 141.87 85.15 71.82 54.39 75.32 89.57 136.79 1944 81.86 100.64 126.19 92.53 132.51 170.41 99.84 56.62 50.18 58.68 71.83 98.48 94.98 1945 87.88 107.63 127.33 159.47 117.67 297.05 94.51 69.32 62.4 87.05 94.23 138.49 120.25 1946 172.08 148.16 305.41 213.79 84.13 131.62 119.63 71.82 61.15 55.41 81.74 94.31 128.27 1947 97.89 121.57 128.39 193.45 160.92 188.99 107.16 71.66 62.74 55.01 78.75 92.71 113.27 1948 99.85 88.38 153.49 158.25 148.89 61.27 54.16 47.31 41.59 37.22 70.11 88.31 87.4 1949 95.33 102.66 105.17 103.07 90.28 57.19 62.34 57.53 57.96 45.2 59.2 71.01 75.58 1950 93.34 86.69 94.34 224.85 157.73 89.91 78.66 73.83 60.78 64.09 76.34 85.92 98.87 1951 92.82 87.49 109.5 372.55 215.18 106.83 98.73 71.46 71.11 104.81 144.41 163.95 136.57 1952 132.57 153.53 158.32 488.01 117.34 85.54 111.39 78.84 60.57 46.13 60.43 94.32 132.25 1953 98 106.04 169.3 266.26 185.46 83.96 68.15 80.45 60.61 48.67 63.48 88.93 109.94 1954 86.13 82.05 65.84 45.01 83.52 113.84 99.31 58.49 62.96 236.4 132.95 144.22 100.89 1955 124.03 102.64 107.23 183.47 135.18 107.17 79.42 59.9 43.57 45.43 72.47 85.25 95.48 1956 72.81 67.62 85.54 167.15 184.41 99.07 90.14 98.45 77.59 62.09 72.46 90.04 97.28 1957 107.62 95.04 71.08 57.95 95.3 126.69 67.47 53.22 45.74 40.79 63.41 89.35 76.14 1958 102.66 90.56 71.46 52.9 56.11 37.25 40.37 33.33 37.47 40.95 43.27 44.23 54.21 1959 58.7 76.58 128.03 198.97 151.1 99.15 55.1 48.81 49.86 92.48 160.17 142.72 105.14 1960 221.74 123.47 110.7 175.07 570.91 192.39 114.65 129.01 136.64 136.7 177.25 155.48 187 1961 70.16 61.55 156.27 244.01 107.56 92.55 72.69 78.88 83.3 131.56 326.42 172.42 133.11 1962 123.32 102.22 137.06 353.6 248.2 98.47 85.31 67.44 68.76 109.72 101.21 90.6 132.16 1963 82.69 73.73 116.11 181.97 99.4 88.57 58.79 46.07 33.41 40.18 47.31 63.23 77.62 1964 83.15 75.81 45.19 50.29 91.51 75.84 53.73 44.92 51.99 64.41 64.63 63.14 63.72 1965 58.6 99.7 181.56 194.95 197.38 104.49 53.47 47.28 84.19 166.79 152.09 208.28 129.06 1966 196.72 177.97 258.84 216.72 102.83 102.09 61.46 45.12 41.22 34.67 57.67 68.68 113.67 1967 80.95 119.59 86.7 274.43 109.64 163.06 123.51 56.79 46.47 51.2 138.99 113.5 113.74 1968 79.37 69.45 88.54 65.24 207.28 146.44 193.96 91.44 84.01 109.68 109.37 110.77 112.96 1969 137.11 160.48 128.71 256.35 173.77 134.89 315.67 63.7 41.69 49.4 84.19 88.61 136.21 1970 145.15 118.67 93.31 45.17 91.98 206.41 46.17 38.21 42.42 48.18 141.49 88.23 92.12 1971 95.69 123.2 196.72 229.01 135.88 123.71 62.47 55.23 47.11 51.24 116.19 123.78 113.35 1972 110.32 94.12 150.86 207.05 190.65 67.3 56.63 67.03 202.02 206.55 206.88 97.75 138.1 1973 194.92 219.81 352.35 370.37 435.99 262.54 89.55 65.41 63.46 76.96 115.22 124.1 197.56 1974 103.48 159.05 153.41 249.67 172.57 196.69 71.3 61.9 49.11 40.6 89.26 112.62 121.64 1975 83.94 91.81 124 175.49 248.28 156.85 57.29 52.3 95.61 64.96 60.09 132.8 111.95 1976 119.17 128.34 183.7 335.56 182.95 77.82 44.38 36.87 28.23 22.28 58.87 60.64 106.57 1977 40.56 50.05 58.44 111.8 72.05 56.27 47.89 39.02 35.39 69.69 115.43 107.79 67.03 1978 115.71 108.99 71.4 107.18 208.44 99.3 154.46 69.94 134.72 104.95 97.16 126.24 116.54 1979 113.54 120.25 212.56 461.94 332.32 156.54 65.62 83.76 122.76 50.76 120.21 132.46 164.39 1980 132.59 119.72 71.73 115.82 95.39 169.06 55.41 107.71 211.21 167.34 81.75 101.37 119.09 1981 106.51 136.16 163.06 192.94 119.47 63.96 56.21 57.94 83.46 184.96 91.93 103.59 113.35 1982 151.3 116.43 104.58 283.48 152.34 99.25 96.29 116.42 59.55 74.34 249.13 279.74 148.57 1983 177.01 141.01 288.5 193.89 214.53 164.38 72.67 59.48 143.3 168.31 143.92 184.98 162.67 1984 139.01 124.54 159.95 102.59 216.51 188.44 124.53 66.23 147.58 209.44 360.83 196.24 169.66 1985 204.46 162.65 308.39 388.13 127.19 52.1 64.97 92.31 148.6 200.02 327.16 243.57 193.3 1986 190.63 131.87 163.15 351.13 133.37 107.68 135.7 115.38 265.17 402.83 171.67 111.4 190 1987 159.88 161.13 108.77 126.32 123.73 73.94 48.96 51.22 56.11 54.85 113.49 151.95 102.53 1988 128.81 140.51 117.93 138.72 83.54 38.93 29.15 30.65 38.03 79.5 122.35 98.74 87.24 1989 83.96 91.29 132.4 134.87 101.69 240 56.69 51.23 38.95 58.1 84.88 73.72 95.65 1990 73.58 72.78 177.03 80.88 173.04 238.87 94.7 125.55 148.48 104.92 105.46 96.51 124.32 1991 97.79 84.38 139.89 226.45 173.75 115.55 61.59 65.07 59.57 78.89 197.94 190.79 124.31 1992 134.62 97.03 166.34 189.1 168.5 93.3 65.05 48.77 159.25 107.14 197.93 210.97 136.5 1993 147.81 126.17 141.81 351.27 368.12 377.55 441.65 204.53 182.81 150.77 166.82 129.24 232.38 1994 116.82 127.76 235.52 114.54 196.4 65.85 163.19 91.29 124.78 118.84 122.59 135.76 134.44 1995 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 Avg 115.8 116.81 146.1 205.7 170.87 134.56 94.58 72.35 81.7 92.63 114.2 114.64 121.66 Std Dev 37.16 33.84 61.61 111.03 88.28 70.89 59.04 38.51 55.1 64.48 63.38 42.44 35.58