The Texas Highland Lakes are a chain of fresh water reservoirs in Central Texas formed by dams on the lower Colorado River.[1] The Texas Colorado River winds southeast from West Texas to Matagorda Bay and the Gulf of Mexico.
The lower Colorado River basin has a history of major flooding. The Lower Colorado River Authority (LCRA) built the dams to manage floods and generate hydroelectric power in the 1930s and 1940s.
Lady Bird Lake (formerly Town Lake) and the respective Longhorn Dam are sometimes considered the seventh "honorary" lake and dam of the Highland Lakes despite being commissioned and managed by the City of Austin instead of the LCRA.[2] [3] Unlike the other reservoirs in the chain which were constructed primarily to prevent flooding and generate hydroelectric power, Lady Bird Lake was constructed in order to provide a cooling pond for the city's new power plant.[4]
| Lake | Dam | Year completed | Managing Authority | Lake area (acres) | Lake length (mi) | Max lake width (ft) | Lake volume (acre-ft) | Dam length (ft) | Dam height (ft) | |
|---|---|---|---|---|---|---|---|---|---|---|
| Lake Buchanan | Buchanan Dam | 1938 | Lower Colorado River Authority | 22,452 | 30.65 | 26,000 (4.92mi) | 880,356 | 10,988 | 145.5 | |
| Inks Lake | Inks Dam | 1938 | Lower Colorado River Authority | 777 | 4.2 | 3,000 | 13,668 | 1,547.5 | 96.5 | |
| Lake LBJ | Wirtz Dam | 1951 | Lower Colorado River Authority | 6,432 | 21.15 | 10,800 | 131,618 | 5,491.4 | 118.3 | |
| Lake Marble Falls | Max Starcke Dam | 1951 | Lower Colorado River Authority | 613 | 5.75 | 1,080 | 7,597 | 859.5 | 98.8 | |
| Lake Travis | Mansfield Dam | 1942 | Lower Colorado River Authority | 19,044 | 1,115,076 | 7,089 | 278 | |||
| Lake Austin | Tom Miller Dam | 1940 | Lower Colorado River Authority | 1,830 | 20.25 | 1,300 | 24,644 | 1,590 | 100.5 | |
| Lady Bird Lake | Longhorn Dam | 1960 | City of Austin | 416 | 6 | 2,500 | 7,151 | 760 | 36 |
In all, the six official dams of the Highland Lakes have a hydroelectric power production capacity of 295MW, with Mansfield Dam alone able to provide 108MW. While Longhorn Dam has no hydroelectric production capacity, Lady Bird Lake served as a cooling pond for the 100MW Seaholm Power Plant and the 550MW Holly Street Power Plant until they were closed in 1996 and 2007, respectively.[5]