The creation of Lake Jocassee by Duke Power Company's massive Keowee-Toxaway Project in the late 1960s and early 1970s flooded a quaint mountain valley whose earliest recorded history was in 1539, when Spanish explorer Hernando de Soto led an expedition through the present-day Jocassee Gorges. In 1971, hundreds watched the slow retreat of the Whitewater, Thompson, Horsepasture, Toxaway, and Keowee Rivers as they formed one large lake, smothering homes, lands, and farms in the process. Years of monitoring the water flow through the valley proved initial estimates correct, and Lake Jocassee became the deepwater source it was intended to be, providing an adequate supply of water to generate electricity. Today, a new generation enjoys many recreational activities on what is known as the "Jewel in South Carolina's Crown," a pristine lake surrounded by the Blue Ridge Mountains in Oconee and Pickens Counties.