The RCR includes a dam that creates the reservoir. As part of the preliminary design, an extensive geotechnical investigation took place. This investigation determined the site specific subsurface conditions at the dam site that allows for a design approach that addresses site specific geological constraints. The design incorporates internal controls that help strengthen the dam. These controls include excavating to rock and injecting a concrete grout curtain down 80 feet below the bottom of the dam, and also installing a concrete cut off wall deep within the interior of the earthen dam to control seepage and strengthen the structure. The RCR dam will be of similar design but much lower in height than the Carters Dam located West of Ellijay. The Carters Dam is the largest earthen dam east of the Mississippi and was constructed in the 1970s.