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Peak Streamflow for Texas


USGS 08151500 Llano Rv at Llano, TX

Llano County, Texas
Hydrologic Unit Code 12090204
Latitude  3045'04", Longitude  9840'10" NAD27
Drainage area 4,197  square miles
Contributing drainage area 4,192  square miles
Gage datum 970.01 feet above sea level NGVD29
Water
Year
Date Gage
Height
(feet)
Stream-
flow
(cfs)
1935 unknown 1935 41.50 380,0007
1940 Jun. 20, 1940 12.90 28,200
1941 Apr. 27, 1941 12.64 26,700
1942 Aug. 23, 1942 11.22 23,400
1943 Jun. 5, 1943 16.92 50,600
1944 May 25, 1944 8.24 10,100
1945 Jan. 18, 1945 7.61 8,500
1946 May 17, 1946 10.47 18,200
1947 Jan. 18, 1947 7.55 8,500
1948 Jun. 25, 1948 22.90 108,000
1949 Apr. 25, 1949 9.78 14,600
1950 May 16, 1950 7.49 7,770
1951 May 25, 1951 9.27 13,900
1952 Sep. 10, 1952 32.60 232,000
1953 May 12, 1953 11.88 16,500
1954 Oct. 4, 1953 7.09 3,460
1955 May 19, 1955 19.00 72,000
1956 Aug. 31, 1956 5.82 1,850
1957 May 27, 1957 16.39 47,200
1958 Oct. 14, 1957 21.78 83,700
1959 Jun. 26, 1959 14.06 35,600
1960 Oct. 4, 1959 22.28 103,000
1961 Jun. 19, 1961 18.87 57,600
1962 Jun. 2, 1962 4.48 1,700
1963 Sep. 16, 1963 4.58 1,810
1964 Sep. 24, 1964 20.10 67,200
1965 May 16, 1965 12.66 24,800
1966 Apr. 25, 1966 9.97 15,400
1967 May 20, 1967 12.56 27,400
1968 Jan. 20, 1968 16.22 44,400
1969 May 7, 1969 6.22 4,520
Water
Year
Date Gage
Height
(feet)
Stream-
flow
(cfs)
1970 Oct. 5, 1969 27.02 154,000
1971 Aug. 12, 1971 14.14 28,000
1972 Oct. 20, 1971 13.37 24,5005
1973 Aug. 1, 1973 9.11 11,4005
1974 Oct. 13, 1973 26.98 154,0005
1975 May 24, 1975 10.92 19,4005
1976 Jul. 4, 1976 17.92 61,5005
1977 Apr. 16, 1977 18.66 67,5005
1978 Aug. 3, 1978 25.61 139,0005
1979 Jun. 1, 1979 12.31 25,8005
1980 Sep. 8, 1980 31.11 210,0005
1981 Jun. 18, 1981 14.24 32,9005
1982 Oct. 14, 1981 23.79 116,0005
1983 Jun. 6, 1983 7.58 5,9705
1984 Jul. 28, 1984 3.29 4905
1985 Dec. 31, 1984 24.00 119,0005
1986 Oct. 20, 1985 16.47 47,1005
1987 Jun. 4, 1987 14.04 35,2005
1988 Jul. 12, 1988 19.21 72,1005
1989 Jun. 11, 1989 5.33 3,3105
1990 May 3, 1990 20.94 87,9005
1991 Sep. 17, 1991 8.14 9,5305
1992 Feb. 4, 1992 20.51 83,7005
1993 Nov. 19, 1992 7.25 7,1605
1994 May 15, 1994 7.34 7,3905
1995 May 30, 1995 9.26 13,0005
1996 Aug. 30, 1996 8.14 9,5305
1997 Jun. 23, 1997 38.86 260,0005
1998 Aug. 24, 1998 14.05 34,7005
1999 Mar. 18, 1999 14.64 37,8005
2000 May 2, 2000 4.21 2,0205
2001 Nov. 4, 2000 29.05 151,0005
Peak Streamflow Qualification Codes.
  • 5 -- Discharge affected to unknown degree by Regulation or Diversion
  • 7 -- Discharge is an Historic Peak