Lake Travis is a reservoir on the Colorado River in central Texas in the United States. The reservoir was formed in 1942 by the construction of Mansfield Dam. Lake Travis has the largest storage capacity of the seven reservoirs known as the Highland Lakes, and stretches 65 miles (105 km) upriver from western Travis County in a highly serpentine course into southern Burnet County to Max Starcke Dam, southwest of the town of Marble Falls.