| Lewisville Lake | |
|---|---|
| Lake Dallas (previously) | |
 Aerial view of Lewisville Lake and Dam | |
  Lewisville Lake  Lewisville Lake | |
| Location | Denton County, Texas |
| Coordinates | 33°04′09″N 96°57′52″W / 33.06917°N 96.96444°W |
| Type | reservoir |
| Primary inflows | Elm Fork of the Trinity River |
| Catchment area | 325,700 acres (1,318 km2) |
| Basin countries | United States |
| Managing agency | United States Army Corps of Engineers |
| Built | 1948 |
| First flooded | 1955 |
| Max. length | 11 mi (18 km) |
| Max. width | 4.24 mi (6.82 km) |
| Surface area | 29,592 acres (11,975 ha) |
| Max. depth | 67 ft (20 m) |
| Water volume | 555,000 acre⋅ft (685,000,000 m3) |
| Surface elevation | 522 ft (159 m) |
| Frozen | 16 February 2021 |
| Islands | has islands and islets |
| Settlements | Lewisville, Texas |
Lewisville Lake, formerly known as Garza-Little Elm Reservoir, is a reservoir in North Texas (USA) on the Elm Fork of the Trinity River in Denton County near Lewisville. Originally engineered in 1927 as Lake Dallas, the reservoir was expanded in the 1940s and 1950s and renamed Lewisville Lake. It was built for flood control purposes and to serve as a water source for Dallas and its suburbs, but residents also use it for recreational purposes.