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. Cartersville is the nearest city to Allatoona Dam. Also, Red Top Mountain State Park is located on its shores, on the peninsula between the two arms of the lake. Most of the north side of the lake remains protected from land development because of its isolated location, mostly blocked by the lake. 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. Allatoona Dam Allatoona Dam is a concrete gravity dam on the Etowah River, authorized by the Flood Control Acts of 1941 and 1944. Delayed due to World War II, construction on the dam began in 1946. The reservoir began to fill in during December 1949 and the dam and power station were in operation in January 1950. The power station has an installed capacity of 85 MW and the dam facility is owned and operated by the U.S. Army Corps of Engineers. Operations Allatoona serves seven authorized purposes: Flood Control Hydropower generation Water supply Recreation Fish and wildlife management Water quality Navigation There are several private marinas and public boat ramps on the banks of the lake. Lake Allatoona also supplies much of the drinking water for the three counties that it is in. The water is supplied mostly by the Etowah River, and its major tributary the Little River (which joins the lake at Bell's Ferry), and in turn Noonday Creek. The other major arm of the lake is Allatoona Creek, extending down to Acworth, where pre-existing Lake Acworth now empties directly into Allatoona at Lake Acworth Drive (Georgia 92). Other significant streams include Kellogg Creek and Rose Creek. The Allatoona Dam holding back the lake was completed in 1949 on the Etowah River, which in turn merges with the Oostanaula River at Rome, Georgia to form the Coosa River of Georgia and Alabama. Its basin upstream (mostly northeast) of Lake Allatoona covers about . This is nearly as large as the basin of Lake Lanier (Atlanta's biggest water source), but since Lake Allatoona is smaller, it drains and