Common construction methods of root cellars: Digging down into the ground and erecting a shed or house over the cellar. Digging into the side of a hill (easier to excavate and facilitates water drainage). Building a structure at ground level and piling rocks, earth, and/or sod around and over it. This may be easier to build on rocky terrain where excavation is difficult. Most root cellars were built using stone, wood, cement, and sod. Newer ones may be made of concrete with sod on top.
'Eutaw, residence of Mr. Wm. H. Sinkler of Eutawville, S.C. Built 1810. -- Original plantation lands were located near present-day Eutaw Springs and were between the Santee River and Eutaw Creek. It is now submerged under Lake Marion as a result of the Santee Cooper Hydroelectric and Navigation Project. image taken in 1901