Lake Blalock
To increase the safe yield of the reservoir, Spartanburg Water System raised the level of Lake Blalock by 10 feet (3.0 m), increasing the water surface elevation to 710 feet (220 m) in 2004. 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. The existing spillway was also upgraded by furnishing and installing three hydraulically operated spillway crest gates, constructing a new cast-in-place concrete ogee crest, and constructing a bridge across the spillway. In addition, the project also cleared approximately 300 acres (42 miles of shoreline) around the perimeter of the reservoir.