The Chestatee River is a 50.8-mile-long (81.8 km) river in the Appalachian Mountains of northern Georgia, USA.It is a major tributary of the Chattahoochee River, into which it ended at a point now under the waters of Lake Lanier, since Buford Dam was built in the 1940s. The watershed area above this point is 153 square miles (400 km2). The National Weather Service has set a flood stage for this gauge of 19 feet (5.8 m). The highest level ever recorded was in 1967, at 25.17 feet (7.67 m) on August 23. This is about ten times its average height or depth.