The Edgefield site consists of three conical earthen mounds arranged on a northwest-southeast axis. The two largest mounds are roughly 20 feet in height, while the third is just under ten feet. Much of the surrounding soil has been removed for use in levee construction, making the mounds appear taller than they are. Archaeological excavations in Mound A indicate that it was built in a single stage during the Mississippi Period, ca. AD 1200-1600.