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Peak Streamflow for Texas

USGS 08150700 Llano Rv nr Mason, TX

Mason County, Texas
Hydrologic Unit Code 12090204
Latitude  3039'38", Longitude  9906'32" NAD27
Drainage area 3,247  square miles
Contributing drainage area 3,242  square miles
Gage datum 1,230.36 feet above sea level NGVD29
Water
Year
Date Gage
Height
(feet)
Stream-
flow
(cfs)
1889 unknown 1889   218,0007
1935 unknown 1935 46.00 380,0007
1952 unknown 1952   258,0007
1968 May 5, 1968 10.38 18,100
1969 Jun. 24, 1969 5.77 3,080
1970 Oct. 5, 1969 18.53 55,700
1971 Aug. 12, 1971 12.94 31,600
1972 Oct. 20, 1971 11.40 23,200
1973 Jul. 31, 1973 8.94 12,000
1974 Oct. 13, 1973 26.30 151,000
1975 May 24, 1975 6.42 5,040
1976 Sep. 2, 1976 12.48 26,900
1977 Apr. 16, 1977 16.64 52,000
1978 Aug. 3, 1978 21.35 92,500
1979 Jun. 1, 1979 12.20 25,500
1980 Sep. 8, 1980 37.00 260,000
1981 Jun. 17, 1981 12.71 29,800
Water
Year
Date Gage
Height
(feet)
Stream-
flow
(cfs)
1982 Oct. 13, 1981 25.06 114,000
1983 May 21, 1983 2.15 340
1984 May 20, 1984 1.94 367
1985 Dec. 31, 1984 25.22 115,000
1986 Oct. 19, 1985 16.18 48,300
1987 Jun. 4, 1987 12.35 24,900
1988 Jul. 12, 1988 18.40 61,600
1989 May 17, 1989 4.34 1,800
1990 May 3, 1990 17.49 55,200
1991 Sep. 17, 1991 10.13 16,400
1992 Feb. 25, 1992 8.87 11,800
1993 Dec. 15, 1992 2.16 496
1994 May 15, 1994 7.27 6,780
1995 Sep. 22, 1995 8.75 11,400
1998 Aug. 24, 1998 16.38 49,300
1999 Jun. 22, 1999 2.67 743
2000 Sep. 25, 2000 4.07 1,820
2001 Nov. 4, 2000 32.00 170,000
Peak Streamflow Qualification Codes.
  • 7 -- Discharge is an Historic Peak