| Lake Austin | |
|---|---|
 Seen from Mount Bonnell | |
  Lake Austin Location of Lake Austin in Texas | |
| Location | Austin, Texas |
| Coordinates | 30°17.66′N 97°47.18′W / 30.29433°N 97.78633°W |
| Lake type | Hydroelectric reservoir |
| Part of | The Texas Highland Lakes |
| Primary inflows | Colorado River (from Lake Travis) |
| Primary outflows | Colorado River (into Lady Bird Lake) |
| Basin countries | United States |
| Managing agency | Lower Colorado River Authority |
| Built | 1939 |
| Surface area | 1,599 acres (647 ha) |
| Max. depth | 75 ft (23 m) |
| Surface elevation | 492 ft (150 m) above sea level |
Lake Austin, formerly Lake McDonald, is a water reservoir on the Colorado River in Austin, Texas. The reservoir was formed in 1939 by the construction of Tom Miller Dam by the Lower Colorado River Authority. Lake Austin is one of the seven Highland Lakes created by the LCRA, and is used for flood control, electrical power generation, and recreation.