Eddie, For many years when new settlements were made in Va..a committee would be appointed to approve where waterpowered mills could be located..If a person wanted to erect a mill and didn't own the land required for the mill dam and race, the committee would determine the value of the land and it could be bought..so a "millseat" would be a location suitable for the building of a mill..such as enough water available to run it and the "fall" of the creek from the location of the mill dam to the "millseat"..The less "fall" the creek had, the further upstream the dam had to be located in order that the water would run above and fall onto the mill wheel..Good millseats probably added value to otherwise useless land...G. Lee Hearl Abingdon, Va...