|Primary inflows||Flint River|
|Primary outflows||Flint River|
|Basin countries||United States|
|Max. length||20 mi (32 km)|
|Max. width||1 mi (1.6 km)|
|Surface area||8,500 acres (34 km2)|
|Average depth||10.5 ft (3.2 m)|
|Max. depth||44.2 ft (13.5 m)|
|Shore length1||95 mi (153 km)|
|Surface elevation||237 ft (72 m)|
|1 Shore length is not a well-defined measure.|
The Crisp County Power Dam, also known as the Warwick Dam, was the first county owned, constructed, and operated power dam in the United States, requiring an amendment to the Georgia State Constitution to make the project legally possible. It came online in August, 1930, under the authority of the Crisp County Power Commission.
The lake is approximately 20 miles (32 km) long and varies in width, but is rarely more than one mile (1.6 km) wide; it covers approximately 8,500 acres (34 km2). It was named for David Blackshear, the founder of Fort Early. When the dam was constructed, little effort was made to cut the trees that would soon be underwater. It was believed that the trees would soon die and decompose once submerged. While this was true for many of the trees, there are still many living Cypress trees in the middle of the lake and there are still many dead trees that have not fallen down. The lake borders five counties in Southwest Georgia: Crisp, Dooly, Lee, Sumter and Worth.