Lake Allatoona (officially called Allatoona Lake) is a U.S. Army Corps of Engineers reservoir on the Etowah River in northwestern part of the State of Georgia. This reservoir is mostly in southeastern Bartow County and southwestern Cherokee County. A small portion is located in Cobb County near Acworth. The major highways Interstate 75 and U.S. Highway 41 pass along the southern and western sided of Lake Allatoona, and they cross the Etowah River downstream from the Allatoona Dam.