Water-Data Report 2009 08088500 near Graford, TX Middle Brazos-Bosque Basin Middle Brazos-Palo Pinto Subbasin

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 , 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. SURFACE-WATER RECORDS PERIOD OF RECORD.--Mar. 1941 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. REVISED RECORDS.--WDR TX-76-2: Drainage area. GAGE.--Water-stage recorder. Datum of gage is NGVD of 1929. Satellite telemeter at station. COOPERATION.--Capacity table 3-C was provided by the . Capacity table 4-C, provided by the Water Development Board, was put into use Oct. 1, 1996. All contents values above 556,200 acre-ft are estimated. REMARKS.--Records good except those for estimated daily contents, which are fair. 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. Two generators located in the powerhouse at the dam can produce 22,500 kilowatts at a 1,000 ft gage height. 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 556,220 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:

U.S. Department of the Interior U.S. Geological Survey Water-Data Report 2009 08088500 Possum Kingdom Lake near Graford, TX—Continued

Site ID Site name 325047098291201 Possum Kingdom Lk Site P3 nr Graford, TX 325125098323701 Possum Kingdom Lk Site P5 nr Graford, TX 325129098311801 Possum Kingdom Lk Site CC nr Graford, TX 325208098254201 Possum Kingdom Lk Site AR nr Graford, TX 325218098254101 Possum Kingdom Lk Site AC nr Graford, TX 325250098275301 Possum Kingdom Lk Site BR nr Graford, TX 325256098275301 Possum Kingdom Lk Site BC nr Graford, TX 325301098342901 Possum Kingdom Lk Site P7 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 325725098280301 Possum Kingdom Lk Site P10 nr Graford, TX 325915098243001 Possum Kingdom Lk Site P9 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. EXTREMES FOR CURRENT YEAR.--Maximum contents, 531,200 acre-ft, Oct. 15, elevation, 998.54 ft; minimum contents, 470,500 acre-ft, Sept. 11, elevation, 994.81 ft.

— 2 — Water-Data Report 2009 08088500 Possum Kingdom Lake near Graford, TX—Continued

RESERVOIR STORAGE, ACRE FEET WATER YEAR OCTOBER 2008 TO SEPTEMBER 2009 DAILY MEAN VALUES [e, estimated] Day Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1 523,600 524,400 e518,000 514,700 511,800 502,900 496,100 489,300 487,400 492,800 491,200 475,400 2 524,000 524,500 517,800 515,000 511,100 502,500 496,200 489,000 e487,000 492,600 493,600 475,000 3 524,400 521,700 518,300 515,400 511,000 502,500 494,900 488,800 487,100 492,000 494,100 474,500 4 524,600 518,600 517,100 514,500 510,700 502,700 495,300 488,900 486,800 491,300 494,700 474,100 5 524,400 518,800 e516,800 513,900 511,000 502,800 494,700 489,200 486,300 490,200 495,500 473,900 6 527,100 518,600 516,900 514,500 511,300 502,600 493,300 490,100 485,900 490,100 495,800 473,600 7 528,200 518,200 517,000 514,500 511,500 502,300 492,600 490,700 485,300 489,900 495,800 473,300 8 528,000 518,300 e517,500 514,600 511,200 502,200 493,100 491,100 485,000 490,400 495,500 472,900 9 528,300 518,300 517,600 515,100 511,600 502,000 493,100 490,800 484,400 490,700 495,100 472,300 10 528,300 518,500 516,300 514,400 511,800 501,900 491,800 490,300 484,100 491,300 494,800 471,700 11 528,500 518,900 e516,000 513,700 509,700 500,700 490,700 490,200 484,400 491,800 494,400 471,500 12 528,500 518,700 516,400 514,200 507,200 501,200 492,100 490,100 484,900 491,900 494,000 473,300 13 529,000 518,700 516,700 513,400 507,500 501,500 492,400 490,200 485,100 491,800 493,500 475,300 14 530,200 519,200 517,200 513,400 506,400 502,200 492,100 489,700 485,400 491,300 493,000 475,800 15 529,800 518,200 516,000 513,000 506,300 502,200 491,900 489,400 486,600 490,800 492,600 476,300 16 520,800 517,700 515,300 512,600 506,000 502,600 491,400 490,500 488,700 490,400 492,100 476,900 17 520,100 517,900 515,600 513,300 506,500 502,600 492,100 490,500 491,100 490,100 491,700 477,100 18 520,900 517,700 516,100 513,400 506,800 502,400 492,500 490,200 493,200 489,700 491,200 477,300 19 521,400 518,000 516,500 513,400 505,800 502,200 492,500 489,900 494,600 489,100 489,700 477,400 20 522,100 517,900 516,400 512,900 505,600 501,700 492,000 489,600 495,200 488,500 483,200 477,700 21 522,400 516,800 515,200 512,500 505,600 501,600 492,200 489,400 495,700 489,000 481,700 477,900 22 522,400 516,800 514,600 512,700 504,600 501,100 492,200 489,200 496,100 487,000 481,600 477,500 23 522,100 517,300 514,700 513,300 504,800 500,500 e491,600 488,800 e496,200 484,700 481,100 477,000 24 522,600 518,000 515,000 511,900 505,300 500,500 490,900 489,000 e495,400 484,700 480,600 476,700 25 523,300 518,500 515,100 511,600 505,400 499,400 490,600 e489,300 494,900 484,600 480,200 476,300 26 524,100 518,700 515,900 511,700 505,600 499,700 490,000 489,600 e494,900 484,300 479,800 476,700 27 523,400 518,500 516,100 511,400 504,900 499,200 489,800 490,100 e494,100 483,900 478,900 476,700 28 523,100 518,700 514,800 511,000 504,100 498,500 489,300 e490,300 494,200 484,100 478,300 476,000 29 523,500 518,500 514,900 511,200 --- 497,400 489,100 e490,700 e493,800 484,100 477,500 475,000 30 523,800 518,700 515,300 511,300 --- 497,600 489,300 e490,200 e492,900 487,000 476,800 474,900 31 524,100 --- 514,900 511,500 --- 496,900 --- 488,100 --- 488,700 476,000 --- Mean 524,700 518,800 516,200 513,200 507,900 501,200 492,200 489,800 489,900 489,000 488,200 475,300 Max 530,200 524,500 518,300 515,400 511,800 502,900 496,200 491,100 496,200 492,800 495,800 477,900 Min 520,100 516,800 514,600 511,000 504,100 496,900 489,100 488,100 484,100 483,900 476,000 471,500

Calendar Year 2008 Water Year 2009 Mean 524,100 500,500 Max 542,600 530,200 Min 498,000 471,500

— 3 — Water-Data Report 2009 08088500 Possum Kingdom Lake near Graford, TX—Continued

540,000

530,000

520,000

510,000

500,000

490,000 MEAN RESERVOIR STORAGE, ACRE FEET ACRE FEET MEAN RESERVOIR STORAGE, 480,000

470,000 O N D J F M A M J J A S 2008 2009

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