USGS Water-Year Summary 2023

08052800 Lewisville Lake near Lewisville, TX

LOCATION - Lat 33°04'09", long 96°57'51" referenced to North American Datum of 1927, Denton County, TX, Hydrologic Unit 12030103, in intake structure of Lewisville Dam on Elm Fork Trinity River, 2.0 mi upstream from bridge on State Highway Business 121, 2.4 mi northeast of Lewisville, 12.0 mi upstream from Denton Creek, and 30.0 mi upstream from mouth.

DRAINAGE AREA - 1,660 mi².

REVISIONS HISTORY - WSP 1922: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Nov. 1954 to Sept. 2000 (U.S. Army Corps of Engineers furnished contents), Oct. 2000 to Sept. 2002 (contents), Oct. 2002 to current year. Prior to Oct. 1970, published as "Garza-Little Elm Reservoir near Lewisville". PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Jan. 1964 to Sept. 1977.

GAGE - Water-stage recorder. Datum of gage is 0.00 ft above NGVD of 1929 and 0.04 ft above NAVD of 1988. To obtain elevations in NAVD of 1988, subtract 0.04 ft. Prior to May 17, 1955, nonrecording gage at site 4,000 ft upstream at same datum. Satellite telemeter at station.

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 rolled earthfill dam 32,888 ft long, including a 560-ft uncontrolled off-channel concrete-gravity spillway with ogee weir section. Deliberate impoundment began Nov. 1, 1954, and the dam was completed in Aug. 1955. The controlled low-flow outlet works consist of a 16.0 ft diameter conduit that is controlled by three 6.5 by 13.0 ft broome-type gates and two 60 in steel pipes with service valves. The dam is owned by the U.S. Army Corps of Engineers. The lake was built for flood control and water conservation. The City of Dallas obtains most of its municipal water supply from this lake. Inflow is affected at times by discharge from the flood-detention pools of 118 floodwater-retarding structures with a combined detention capacity of 81,670 acre-ft. These structures control runoff from 298 mi² in the Elm Fork Trinity River, Clear, Little Elm, and Hickory Creek watersheds. An unknown amount of water was diverted for municipal and industrial uses. Data regarding the dam are given in the following table:

                                                                              Elevation (feet)
Top of dam............................................................          560.0
Crest of spillway.....................................................          532.0
Lowest intakes to wet wells (invert)..................................          481.0
Invert of three broome-type gates.....................................          448.0

Water-quality records available from Sept. 1975 to July 1997, Jan. 1999 and Aug. 2006 were published separately as:

Site ID                Site name
330419096575401  Lewisville Lk Site AC nr Lewisville, TX
330410096584501  Lewisville Lk Site AL nr Lewisville, TX
330450096560501  Lewisville Lk Site BC nr Lewisville, TX
330606097025601  Lewisville Lk Site CC nr Lewisville, TX
330755096572001  Lewisville Lk Site DC nr Lewisville, TX
330959096565301  Lewisville Lk Site EC nr Lewisville, TX
330722096592201  Lewisville Lk Site FC nr Lewisville, TX
330944097003601  Lewisville Lk Site GC nr Lewisville, TX
330918096594601  Lewisville Lk Sec 1 nr Lewisville, TX
330930096571501  Lewisville Lk Sec 2 nr Lewisville, TX

EXTREMES FOR PERIOD OF RECORD - Maximum contents, 1,181,000 acre-ft, May 4, 1990, elevation, 536.73 ft; minimum since initial filling in 1957, 184,700 acre-ft, Sept. 28, 1980, elevation, 498.65 ft; maximum elevation, 536.94 ft, May 31, 2015.