The Trinity River Authority or TRA was formed in 1955 by the Texas

Texas

Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

 legislature. Its main concerns are water

Water

Water is a chemical substance with the chemical formula H2O. A water molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state . Water also exists in a...

 supply and water conservation

Conservation ethic

Conservation is an ethic of resource use, allocation, and protection. Its primary focus is upon maintaining the health of the natural world: its, fisheries, habitats, and biological diversity. Secondary focus is on materials conservation and energy conservation, which are seen as important to...

 in the Trinity River Basin

Trinity River (Texas)

The Trinity River is a long river that flows entirely within the U.S. state of Texas. It rises in extreme north Texas, a few miles south of the Red River. The headwaters are separated by the high bluffs on the south side of the Red River....

. The authority extends over 17965 square miles (46,529 km²), including all or part of 17 counties. The general offices of the authority are located in Arlington, Texas

Arlington, Texas

Arlington is a city in Tarrant County, Texas within the Dallas–Fort Worth metropolitan area. According to the 2010 census results, the city had a population of 365,438, making it the third largest municipality in the Metroplex...

.

Dams and reservoirs

Since 1911, 31 major reservoirs have been constructed in the drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 of the Trinity River, 29 of which fall under the jurisdiction of the Trinity River Authority.

• Lake Anahuac
  Lake Anahuac
  Lake Anahuac is an artificial lake fed by the Trinity River, east of downtown Houston, Texas, USA in western Chambers County. The city of Anahuac lies on its eastern shores....
  
  
• Lake Arlington
• Lake Amon G. Carter
• Lake Bardwell
• Benbrook Lake
  Benbrook Lake
  Benbrook Lake is a reservoir on the Clear Fork of the Trinity River in Tarrant County, Texas, USA. The lake is located approximately 10 miles southwest of the center of Fort Worth, where the Clear Fork and the West Fork of the Trinity River join. The lake is impounded by the Benbrook Dam. The...
  
  
• Lake Bridgeport
• Cedar Creek Reservoir
  Cedar Creek Reservoir (Texas)
  Cedar Creek Reservoir is a reservoir located in Henderson and Kaufman Counties, Texas , 60 miles  southeast of Dallas. It is built on Cedar Creek, which flows into the Trinity River...
  
  
• Fairfield Lake
• Grapevine Lake
  Grapevine Lake
  Grapevine Lake is a freshwater lake located in the north Texas area, approximately northwest of Dallas, Texas. It was impounded in 1952 by the US Army Corps of Engineers when they dammed Denton Creek. The lake's primary purposes are flood control and to act as a water reservoir, with a secondary...
  
  
• Lake Halbert

• Houston County Lake
• Lake Ray Hubbard
  Lake Ray Hubbard
  Lake Ray Hubbard, formerly Forney Lake, is a reservoir located in Dallas, Texas in the counties of Dallas, Kaufman, Collin, and Rockwall County, Texas, just north of Forney, Texas, built on the East Fork Trinity River and impounded by the Rockwall-Forney Dam.It measures 22,745 acres in size with...
  
  
• Lake Lavon
  Lake Lavon
  Lake Lavon is a reservoir located in North Texas on the East Fork of the Trinity River in Collin County near Wylie. It is off of State Highway 78. Lake Lavon's dominant fish species are the largemouth bass, white bass, blue catfish, and crappie....
  
  
• Lewisville Lake
  Lewisville Lake
  Lewisville Lake is a reservoir located in North Texas on the Elm Fork of the Trinity River in Denton County near Lewisville. The lake is primarily used recreationally for boating and watercraft, however, it was built for flood control purposes and to serve as a water source for Dallas and its...
  
  
• Lost Creek Reservoir
• Lake Livingston
  Lake Livingston
  Lake Livingston is a reservoir located in the East Texas Piney Woods. Lake Livingston was built, and is owned and operated, by the Trinity River Authority of Texas under contract with the City of Houston for water supply purposes. The lake is the largest lake constructed for water supply purposes...
  
  
• Eagle Mountain Lake
  Eagle Mountain Lake
  Eagle Mountain Lake is a freshwater lake in North Texas. The lake was created by damming the West Fork of the Trinity River and sits below Lake Bridgeport and above Lake Worth . The lake dam was finished on October 24, 1932. In 1965, the District voters approved a bond issue to allow the District...
  
  
• Joe Pool Lake
  Joe Pool Lake
  Joe Pool Lake is a fresh water impoundment located in the southern part of the Dallas/Fort Worth Metroplex in North Texas . The lake encompasses parts of Tarrant, Dallas and Ellis counties. The lake measures with a conservation storage capacity of...
  
  
• Mountain Creek Lake
  Mountain Creek Lake
  Mountain Creek Lake is a reservoir located southwest of downtown Dallas, Texas in the Mountain Creek area of the city. It is located south of SH 180, west of Spur 408, north of I-20, and east of FM 1382. The defunct Naval Air Station Dallas is located on the northwestern shore of the lake...
  
  
• Navarro Mills Lake

• North Lake
  North Lake (Dallas County, Texas)
  North Lake is a reservoir located in Dallas,Texas , southeast of Coppell. North Lake Park is on its southern side.- History :The lake area was once a large bowl-like valley, that was being used for farming. Construction on North Lake Dam began in 1956 and the dam was complete in August 1957...
  
  
• Richland-Chambers Reservoir
  Richland-Chambers Reservoir
  Richland-Chambers Reservoir is the third largest inland reservoir by surface area and the 8th largest reservoir by water volume in Texas formed by the impoundment of Richland Creek and Chambers Creek east-southeast of the town of Corsicana and south of Kerens, in Navarro County and Freestone...
  
  
• Ray Roberts Lake
  Lake Ray Roberts
  Lake Ray Roberts is a reservoir located north of Denton, Texas, between the cities of Pilot Point, Texas and Sanger, Texas.. It was named after Ray Roberts in 1980....
  
  
• New Terrell City Lake
• Trinidad Lake
• Wallisville Lake
• Lake Waxahachie
• Lake Weatherford
• Lake Worth
  Lake Worth (Texas)
  Lake Worth is located on the West Fork of the Trinity River. It is entirely inside the Fort Worth, Texas city limits.Lake Worth is a reservoir in Texas. It was built in 1914 as a reservoir and for recreation. The lake is controlled by the City of Fort Worth Lake Worth Management Office. The lake...