USGS Water-Year Summary for Site 08088500

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	Available Parameters
	62614 Elevation, lake/res, NGVD29(Max.,Min.,Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

08088500 Possum Kingdom Lake near Graford, TX

LOCATION - Lat 32°52'20", long 98°25'32" referenced to North American Datum of 1927, Palo Pinto County, TX, Hydrologic Unit 12060201, at Morris Sheppard Dam on the Brazos River, 2.6 mi upstream from Loving Creek, 11.3 mi southwest of Graford, and at mile 687.5.

DRAINAGE AREA - 23,596 mi² of which 9,566 mi² probably is noncontributing.

REVISIONS HISTORY - WDR TX-76-2: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Mar. 1941 to Sept. 2010 (contents), Oct. 2010 to current year. Prior to Oct. 1977, published as "Possum Kingdom Reservoir". PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Mar. 1962 to Sept. 1997. BIOCHEMICAL DATA: Jan. 1975 to Sept. 1977.

GAGE - Water-stage recorder. Datum of gage is 0.00 ft above NGVD of 1929 and 0.83 ft below NAVD of 1988. To obtain elevation values in NAVD 1988, add 0.83 ft. Satellite telemeter at station.

COOPERATION - Capacity Table 3-C was provided by the Brazos River Authority. Capacity Table 4-C, provided by the Texas Water Development Board, was put into use Oct. 1, 1996. All contents values above 556,200 acre-ft are estimated. Capacity Table No. 5, from a survey performed by the Texas Water Development Board, was put into effect beginning Oct. 1, 2009.

REMARKS - Some records listed in the "Period of Record" for surface water and water quality may not be available electronically. The lake is formed by a reinforced concrete dam, Ambursen-type, massive buttress with flat-slab deck, a controlled spillway, two bulkhead sections, and an earthen-dike section. Total length of the dam is 2,740 ft. The dam is owned by the Brazos River Authority, was completed and storage begun Mar. 21, 1941. The spillway has nine roof-weir gates (modified bear-trap type) that are 73.66 x 13 ft each and are designed to discharge about 100,000 ft³/s at a gage height of 1,000 ft. The outlet works consist of one controlled 54-in diameter conduit. Water is used for power development, irrigation, municipal, industrial, and recreational purposes. Eleven major reservoirs, with a combined capacity of 607,800 acre-ft, largely regulate the inflow. Flow is affected at times by discharge from the flood-detention pools of 12 floodwater-retarding structures with a combined detention capacity of 24,710 acre-ft. These structures control runoff from 108 mi². Conservation pool storage is 540,340 acre-ft. Data regarding the dam are given in the following table:

                                                                               Elevation (feet)
Top of dam............................................................         1,024.0
Design flood (top of gates)...........................................         1,000.0
Crest of spillway.....................................................           987.0
Invert of penstock....................................................           911.5
Lowest gated outlet (invert of 54-inch conduit).......................           874.8

Water-quality records available from Feb. 1978 to Sept. 1997 and Aug. 2006 were published separately as:

Site ID                Site name
325218098254101  Possum Kingdom Lk Site AC nr Graford, TX
325208098254201  Possum Kingdom Lk Site AR nr Graford, TX
325256098275301  Possum Kingdom Lk Site BC nr Graford, TX
325250098275301  Possum Kingdom Lk Site BR nr Graford, TX
325129098311801  Possum Kingdom Lk Site CC nr Graford, TX
325327098314001  Possum Kingdom Lk Site DC nr Graford, TX
325347098265701  Possum Kingdom Lk Site EC nr Graford, TX
325557098264401  Possum Kingdom Lk Site FC nr Graford, TX
325715098250501  Possum Kingdom Lk Site GC nr Graford, TX
325047098291201  Possum Kingdom Lk Site P3 nr Graford, TX
325125098323701  Possum Kingdom Lk Site P5 nr Graford, TX
325301098342901  Possum Kingdom Lk Site P7 nr Graford, TX
325915098243001  Possum Kingdom Lk Site P9 nr Graford, TX
325725098280301  Possum Kingdom Lk Site P10 nr Graford, TX

EXTREMES FOR PERIOD OF RECORD - Maximum contents observed, 743,700 acre-ft, Oct. 5, 1941, elevation, 1,001.00 ft; maximum elevation, 1,003.60 ft Oct. 13, 1981; minimum contents observed, 273,000 acre-ft, Feb. 19 to Mar. 17, 1953, elevation, 967.00 ft.