Country= U.S.A. Station= FOUR CORNERS, CO River= SAN JUAN R Area= 37811.76 Lat= 37 Lon= -109.03 Source= USGS PointID= 9371010 Area Units= km2 Discharge Units= m3/sec Starting Year= 1931 Ending Year= 1993 Total Years= 63 Total Usable Years= 62 Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Avg Annual 1931 98.74 120.05 120.41 102.05 49.74 9.15 0 0 0 20.13 47.18 64.7 52.68 1932 55.46 66.44 73.76 53.09 32.98 32.71 4.04 2.68 3.81 56.31 67.62 63.86 42.73 1933 77.06 58.34 81.33 74.17 131.45 31.81 0 1.64 69.27 58.14 65.46 67.4 59.67 1934 76.46 58.46 58.75 36.74 1.51 0 0 0 0 0 0 31.42 21.94 1935 43.32 63.07 43.86 22.83 108.44 257.58 9.66 0.15 2.46 6.28 37.98 32.01 52.3 1936 37.72 43.48 69.13 21.92 21.13 8.33 0 0 0 0 13.35 25.21 20.02 1937 9.4 63.97 90.62 33.77 2.98 28.09 0 0 1.49 16.43 41.74 54.92 28.62 1938 64.72 73.37 64.9 28.67 58.6 28.03 14.43 6.67 84.09 28.64 61.34 46.48 46.66 1939 71.18 48.93 111.64 105.27 18.64 13.72 4.24 0.48 0 5.58 9.98 20.79 34.2 1940 25.46 51.44 64.33 15.9 6.33 19.03 0.01 0 0.02 0 13.62 10.68 17.24 1941 9.23 9.24 9.63 10.68 8.68 4.97 3.53 1.53 1.18 2.13 4.78 4.43 5.83 1942 9.51 13.41 30.19 31.47 255.19 119.12 45.01 5.45 32.12 17.99 23.06 47.49 52.5 1943 48.29 52.12 45.46 61.88 38.84 35.21 5.22 6.74 11.17 16.06 30.98 32.51 32.04 1944 37.33 33.94 37.78 37.22 64.33 14.99 8.02 13.57 13.77 23.65 35.16 54.18 31.16 1945 38.74 44.58 38.63 28.27 26.9 58.2 17.95 18.81 19.81 30.82 31.12 28.37 31.85 1946 42.68 41.2 45.9 24.76 27.43 18.5 11.1 10.95 21.68 52.54 34.07 41.77 31.05 1947 35.6 37.23 44.05 43.31 23.75 90.27 92.36 22.43 29.01 33.82 32.64 43.34 43.98 1948 47.23 54.66 73.7 48.02 24.9 23.94 15.24 25 12.63 25.22 45.06 37.03 36.05 1949 28.45 49.17 76.68 67.65 56.1 167.25 51.69 15.77 25.12 40.74 49.04 49.72 56.45 1950 40.29 52.23 55.97 49.73 35.72 18.88 10.55 7.71 20.04 34.92 45.29 46.81 34.85 1951 46.49 52.84 53.23 46.88 57.77 66.11 43.41 24.52 53.7 52.59 60.39 49.67 50.63 1952 67.74 109.9 120.78 77.89 56.68 43.27 20.23 12.68 12.35 25.01 29.96 31.94 50.7 1953 44.17 43.97 49.15 37.93 32.83 15.42 6.26 4.51 4.61 17.85 32.63 35.32 27.05 1954 32.07 39.3 34.28 25.51 24.61 6.89 5.06 13.25 3.69 18 26.04 25.65 21.2 1955 27.32 35.67 38.81 24.68 9.06 14.47 6.28 4.7 3.97 17.07 24.22 24.55 19.23 1956 26.14 26.11 27.95 23.07 4.84 7.59 4.49 2.37 1.55 11.45 18.15 16.22 14.16 1957 17.2 20.48 18.84 22.72 70.2 46.32 9.6 4.45 17.01 28.19 29.65 32.95 26.47 1958 35.07 41.11 51.98 62.99 72.15 51.1 21.12 11.22 9.09 21.83 29.82 30.8 36.52 1959 31.15 39.52 48.03 50.09 23.02 6.58 6.28 4.76 13.92 33.79 35.8 33.64 27.22 1960 34.09 43.37 66.38 46.03 28.63 23.09 10.5 3.64 6.38 23.41 24.99 26.73 28.1 1961 28.47 27.83 32.21 28.56 25.18 40.43 5.28 12.77 9.65 37.06 48.95 41.16 28.13 1962 38 61.43 61.65 33.13 23.26 55.13 24.47 9.84 20.54 30.32 42.05 36.9 36.39 1963 35.56 48.62 44.79 34.38 12.42 15.93 6.14 5.53 27.89 27.15 27.19 31.32 26.41 1964 34.11 32.53 35.56 33.61 14.12 15.06 7.23 12.51 12.79 25.01 26.25 28.19 23.08 1965 30.75 36.14 32.83 28.91 25.37 88.33 41.49 14.9 45.71 63.19 57.94 61.07 43.89 1966 56.1 57.48 68.28 61.16 17.54 16.77 8.75 9.98 17.54 31.7 30.77 29.57 33.8 1967 32.18 33.94 29.5 14.69 14.75 69.78 84.27 11.91 27.01 37.95 40.85 36.98 36.15 1968 40.42 41.55 40.59 36.29 28.96 14.51 9.55 14.82 24.71 36.65 38.61 38.08 30.4 1969 41.43 43.01 51.67 35.31 35.66 43.94 49.31 9.64 33.16 36.48 44.54 51.81 39.66 1970 50.92 64.87 64.43 71.24 54.39 81.26 32.07 13.18 30.75 52.78 45.29 57.76 51.58 1971 62.97 64.41 69.2 68.91 254.49 307.47 40.82 12.6 26.55 54.35 61.5 67.57 90.9 1972 76.09 82.44 95.44 54.3 64.52 17.7 13.05 21.07 26.66 52.79 55.12 47.27 50.54 1973 51.21 73.67 66.45 79.46 336.25 328.1 37.07 38.25 140.01 179.24 112.61 97.52 128.32 1974 99.31 127.24 185.25 196.86 57.92 22.34 9.46 13.61 26 31.8 31.63 36.92 69.86 1975 39.19 41.32 42.41 42.99 24.3 51.49 13.68 15.54 30.55 31.91 39.37 42.92 34.64 1976 49.28 51.82 47.27 49.47 26.49 11.04 8.5 5.65 22.28 25.95 29.74 37.12 30.38 1977 32.62 37.25 42.27 62.13 43.01 19.51 8.96 11.35 26.11 29.07 31.02 34.06 31.45 1978 29.28 29.96 46.24 40.67 21.82 10.35 10.29 11.01 16.29 27.63 30.76 32.24 25.55 1979 27.09 31.26 50.68 31.73 20.6 83.71 40.85 12.42 17.15 17.44 21.04 56.38 34.2 1980 64.9 77.74 85.62 138.89 277.39 152.36 7.05 10.45 24.54 23 26.25 32.96 76.76 1981 38.94 40.18 36.44 19.82 18.45 9.22 27.37 17.51 22.31 26.54 26.32 36.12 26.6 1982 28.09 43.58 45.19 24.75 16.92 11.14 7.09 8.8 24.71 23.79 48.83 54.31 28.1 1983 74.29 85.52 84.76 110.96 226.13 537.08 322.31 187.87 227.68 74.31 41.97 91.36 172.02 1984 121.22 190.57 204.06 284.69 356.52 268.81 48.46 20.23 116.45 119.52 163.26 141.91 169.64 1985 94.2 102.32 119.67 52.84 55.51 33.41 16.1 13.69 36.04 54.21 47 53.49 56.54 1986 82.75 94.28 71.69 110.29 80.79 97.06 39.99 70.72 113.02 111.09 84.38 80.72 86.4 1987 80.29 78.18 85.33 81.01 97.47 93.91 24.25 22.63 55.78 53.02 58.06 63.42 66.11 1988 61.79 92.25 73.04 55.45 61.5 13.92 29.94 21.15 28.07 30.29 23.19 33.62 43.68 1989 43.94 49.68 60.5 19.31 12.66 20.26 16.15 16.59 28.03 21.09 21.28 24.9 27.87 1990 36.57 39.77 44.97 54.62 34.44 11.64 7.28 20.87 14.72 19.28 24.21 21.54 27.49 1991 28.69 40.87 33.17 21.47 36.63 25.42 9.73 11.38 15.13 15.18 26.3 28.97 24.41 1992 34.23 41.99 66.37 32.68 12.62 14.26 21.24 17.82 11.89 30.47 27.15 36.35 28.92 1993 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 -9999 Avg 46.83 55.67 62.32 53.64 60.67 61.97 23.46 14.87 28.61 34.66 39.27 43.15 43.76 Std Dev 22.9 29.37 33.99 43.8 78.81 93.88 42.75 24.6 37.49 28.74 24.25 21.54 30.59