Pinopolis Dam is a dam in Berkeley County, South Carolina. The earthen and concrete dam was completed in 1941 by Santee Cooper, the state-owned electric and water utility also known as South Carolina Public Service Authority. The dam is 138 feet high and 11,500 feet long at its crest. The $48.2 million project (55 percent federal loan, 45 percent federal grant) first generated electricity on Feb. 17, 1942. As transmission lines were built, power flowed to customers in Berkeley, Georgetown and Horry counties, and ultimately to electric cooperatives serving customers in 46 counties.