USGS Water-Year Summary for Site 08051100

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	Available Parameters
	45592 Gate opening, height(Max.,Min.,Mean)
	45592 Gate opening, height(Max.,Min.,Mean)
	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

08051100 Ray Roberts Lake near Pilot Point, TX

LOCATION - Lat 33°21'19", long 97°02'59" referenced to North American Datum of 1927, Denton County, TX, Hydrologic Unit 12030103, in control room of outlet works tower located 336 ft upstream from center line of Ray Roberts Dam (and Farm Road 455 which is located on top of dam) on Elm Fork Trinity River, 3.7 mi upstream from Bray Branch, 5.7 mi southwest of Pilot Point, and at river mile 60.0.

DRAINAGE AREA - 692 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - July 1987 to Sept. 2000 (U.S. Army Corps of Engineers furnished contents), Oct. 2000 to Sept. 2002 (contents), Oct. 2002 to current year. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Sept. 1996. BIOLOGICAL DATA: Sept. 1996. PESTICIDE DATA: Sept. 1996. RADIOCHEMICAL DATA: Sept. 1996.

GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 and 0.14 ft above NAVD of 1988. To obtain elevations in NAVD of 1988, subtract 0.14 ft. Satellite telemeter at station.

REMARKS - Some records listed in the "Period of Record" for surface water and water quality may not be available electronically. Lake is formed by a rolled earthfill dam 15,250 ft long. There is an uncontrolled, broad-crested spillway excavated in natural ground about 5,000 ft right of right end of dam. A reinforced concrete tower houses the flood-control and low-flow gates and operating equipment. Construction started Sept. 16, 1980, and closure was made in May 1986. The dam was built and is owned by the U.S. Army Corps of Engineers. Deliberate impoundment started June 30, 1987. The lake was built for water supply, flood control, and recreation purposes. Data regarding the dam are given in the following table:

                                                                              Elevation (feet)
Top of dam............................................................          665.0
Spillway crest (uncontrolled).........................................          645.5
Top of flood-control pool.............................................          640.5
Invert, lowest gated outlet...........................................          551.0

Water-quality records available from Feb. 1989 to Aug. 2006 were published separately as:

Site ID                Site name
332138097024101  Ray Roberts Lk Site AC nr Pilot Point, TX
332200097010001  Ray Roberts Lk Site AL nr Pilot Point, TX
332301097050601  Ray Roberts Lk Site BC nr Pilot Point, TX
332353097020101  Ray Roberts Lk Site CC nr Pilot Point, TX
332459097063001  Ray Roberts Lk Site DC nr Pilot Point, TX
332509096595301  Ray Roberts Lk Site EC nr Pilot Point, TX
332758097063301  Ray Roberts Lk Site FC nr Pilot Point, TX
332642096561201  Ray Roberts Lk Site GC nr Pilot Point, TX
332800096565401  Ray Roberts Lk Site HC nr Pilot Point, TX

EXTREMES FOR PERIOD OF RECORD - Maximum contents, 1,219,000 acre-ft, May 3, 1990, elevation, 644.48 ft; minimum contents after initial filling, 405,700 acre-ft, Oct. 13, 2001, elevation, 615.33 ft.