Lake Blalock (formally, the H. Taylor Blalock Reservoir) is a reservoir in Spartanburg County, South Carolina, located on the Pacolet River about five miles north of Spartanburg.

After its creation was authorized in 1976 by the Commissioners of Spartanburg Water System, Blalock Dam was constructed in 1983.

It was originally designed for a normal operating pool of 700 feet (210 m), and the lake had approximately 35 miles (56 km) of shoreline.

This project was completed in 2006 and involved overlaying the existing earthen dam with a layer of roller compacted concrete, approximately 3 ft (0.91 m) in thickness, and constructing a new RCC stilling basin.

In addition, the project also cleared approximately 300 acres (42 miles of shoreline) around the perimeter of the reservoir.