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USGS Water-Year Summary 2024
08090885 Lake Granbury at US Highway 377, Granbury, TX
LOCATION - Lat 32°25'58", long 97°47'20" referenced to North American Datum of 1927, Hood County, TX, Hydrologic Unit 12060201, on downstream side of U.S. Highway 377 bridge, 0.6 mi southeast of downtown Granbury, and 0.3 mi east of Highway 144.
DRAINAGE AREA - 25,679 mi² of which 9,566 mi² probably is noncontributing.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Oct. 2005 to current year.
GAGE - Water-stage recorder. Datum of gage is 1.11 ft below NGVD of 1929 (Brazos River Authority Datum) and 1.12 ft below NAVD of 1988. To obtain elevations in NAVD 1988, add 1.12 ft. Satellite telemeter at station.
REMARKS - The lake is formed by an Ambursen-type concrete and earthfill dam 2,256 ft long, including a 932-ft concrete spillway. The dam was completed on Aug. 30, 1969, and deliberate impoundment began Sept. 15, 1969. The spillway consists of sixteen 36- by 35-ft tainter gates and two 7- by 8-ft sluice gates. Outflow through the sluice gates discharges into a bay where the outflow is then controlled by two 4- by 4.5-ft sluice gates with inverts at 625.8 ft. Flow is affected at times by discharge from the flood-detention pools of twelve floodwater-retarding structures with a combined detention capacity of 13,940 acre-ft. These structures control runoff from 53.9 mi² in the East Keechi, Kickapoo, and Ruckers Creeks drainage basins. The lake was built by the Brazos River Authority for the conservation of water for irrigation, municipal, and industrial uses. Water is also diverted into Squaw Creek Reservoir (station 08091730, conservation pool storage 151,030 acre-ft). The City of Granbury returns wastewater effluent into Lake Granbury. Conservation pool storage is 129,011 acre-ft. Data regarding the dam are given in the following table:
Elevation (feet) Top of dam............................................................ 706.5 Top of tainter gates (design flood)................................... 693.0 Crest of spillway..................................................... 658.0 Lowest gated outlet (invert).......................................... 640.0
EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 693.30 ft, May 10, 2015; minimum elevation, 681.48 ft, June 21, 2014.
