The lake dam was built in 1910 and electricity was originally generated for Macon, GA. Lake Jackson is formed by the Alcovy, South, and Yellow Rivers and Tussahaw Creek. The largest single river drainage in the southeastern U.S. -up to 100,000 cubic feet per second- comes from Georgia’s Altamaha River. It flows into the Atlantic Ocean near St. Simons Island. Its headwaters are located in the upper Piedmont. The Alcovy is one of these upper Piedmont headwaters, with its water flowing into Lake Jackson, an impoundment lake that drains into the Ocmulgee. The Ocmulgee joins the Oconee in the coastal plain to form the Altamaha. Come visit Jackson Lake and see all of the wonderful things we have to offer our visitors. You can choose from many lake activities such as boating, fishing, swimming, camping, and more!