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USGS Water-Year Summary 2024
08079700 Lake Alan Henry Reservoir near Justiceburg, TX
LOCATION - Lat 33°03'46", long 101°02'50" referenced to North American Datum of 1927, Garza County, TX, Hydrologic Unit 12050004, on left bank at left end of John T. Montford Lake Alan Henry Dam inside intake structure control room 14.6 river miles downstream of the Double Mountain Fork of the Brazos River stream gage, 0.5 mi west of Garza and Kent county line and 9.0 miles east of Justiceburg, TX.
DRAINAGE AREA - 1,617 mi² of which 1,222 mi² probably is noncontributing.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Oct. 1997 to Sept. 2003 (contents), Oct. 2003 to current year.
GAGE - Water-stage recorder. Datum of gage is 0.00 ft from Brazos River Authority benchmark (vertical control datum unknown). Satellite telemeter at station.
COOPERATION - Records of diversion may be obtained from the Brazos River Authority.
REMARKS - The dam was completed Oct. 1993. The reservoir is formed by a rolled earthfill dam, 3,600 foot long. The dam and lake are owned by the city of Lubbock and operated by Brazos River Authority for recreation and future municipal use. The spillway consists of a fixed gate type service spillway with an ogee crest and a 1,700-foot-long emergency spillway cut into natural ground near right end of dam. The control works consist of 30- and 42-inch-diameter gated steel conduits, encased in concrete, that discharge from the outlet structure. Data regarding the dam are given in the following table:
Elevation (feet)
Top of dam............................................................ 2,263.0
Design flood.......................................................... 2,259.4
Crest of spillway..................................................... 2,240.0
Crest of service spillway............................................. 2,220.0
Lowest gated outlet (invert).......................................... 2,140.0
EXTREMES FOR PERIOD OF RECORD - Oct. 1997 to Sept. 2003: Maximum contents, 93,590 acre-ft, Sept. 12, 2003; minimum contents, 34,640 acre-ft, Mar. 16, 17, 1999; Oct. 1997 to current year: maximum elevation, 2,229.64 ft, July 5, 2010; minimum elevation, 2,180.91 ft, Mar. 16, 17, 1999.
