One of the most visible is the grandstand of the old Hall County Race Track. You can see it, protruding out of the water along a walking trail at Laurel park. Just across the lake at the bottom of Old Cleveland Highway, you can find the foundation of a filling station, complete with grease pit.
As of Sunday morning, the level of the lake was 1055.27, which is 15.73 feet below full pool.

Grand Stand of Hall County Race Track

Grease Pit

Grease Pit

Gas pump Island

Cabin Cruiser near Riverside Drive
http://accesswdun.com/article/2007/11/203673