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USGS Water-Year Summary 2024
08206900 Choke Canyon Reservoir near Three Rivers, TX
LOCATION - Lat 28°29'01", long 98°14'44" referenced to North American Datum of 1927, Live Oak County, TX, Hydrologic Unit 12110108, at Choke Canyon Dam on Frio River, 3.9 mi upstream from Atascosa River, and 4.0 mi west of Three Rivers.
DRAINAGE AREA - 5,490 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - Oct. 1984 to current year.
GAGE - Water-stage recorder. Datum of gage is 0.046 ft. above NADV88 done by RTK on 9/21/2023. Prior datum of gage was NGVD of 1929. Satellite telemeter at station.
COOPERATION - Capacity table computed June 1, 1983, provided by the City of Corpus Christi. Prior to Oct. 1, 1999, elevation and reservoir contents record provided by the City of Corpus Christi.
REMARKS - Some records listed in the "Period of Record" for surface water and water quality may not be available electronically. The reservoir is formed by a rolled earthfill dam, 3.5 mi long. The dam was completed and deliberate impoundment began on Oct. 12, 1982. The spillway has seven radial gates, each 50 ft long and 24 ft high. Water for municipal and industrial use to meet the needs of the Coastal Bend area is released downstream through a 5.0- x 5.0-foot square slide gate. The dam is owned by the City of Corpus Christi. Conservation pool storage is 695,271 acre-ft. Data regarding the dam are given in the following table:
Elevation (feet)
Top of dam........................................................... 241.1
Top of spillway gates................................................ 222.5
Crest of spillway.................................................... 199.5
Lowest gated outlet (invert)......................................... 136.3
Beginning in Water Year 2006, water-quality data that were published with this site are now published separately as:
Site ID Site name 08206890 Choke Canyon Reservoir Site AC near Three Rivers, TX 08206880 Choke Canyon Reservoir Site BC near Three Rivers, TX 08206870 Choke Canyon Reservoir Site CC near Three Rivers, TX 08206860 Choke Canyon Reservoir Site DC near Three Rivers, TX 08206850 Choke Canyon Reservoir Site EC near Three Rivers, TX 08206840 Choke Canyon Reservoir Site FC near Three Rivers, TX
EXTREMES FOR PERIOD OF RECORD - Maximum daily contents, 767,000 acre-ft, Sept. 12, 2002; elevation, 223.34 ft; minimum daily, 4,500 acre-ft Oct. 1-9, 1984, elevation, 156.91 ft.
