Do you know which dam being built affected the cemetery where you great grandmother was buried? I have come across various listings of graves that have been relocated because of dams being built. For example, on the Tennessee Valley Authority website there is a listing of cemetery and grave relocation's due to the dam. You might Google the name of the dam or lake in the area where you think your great-grandmother's grave was located. If it was Buckhorn Lake, I found a site that states that 873 graves from the lost community of Bowlington in Hazard, Kentucky were relocated to Buckhorn Cemetery. Hope this helps.