The route then continues eastward through DeKalb, Gwinnett, Walton, Clarke, Oglethorpe, Wilkes, McDuffie and Columbia Counties into Augusta and then onto one of the twin bridges across the Savannah River into South Carolina.
The route then continues eastward through DeKalb, Gwinnett, Walton, and Oconee counties. From there US 78 passes through Oglethorpe, Wilkes, McDuffie and Columbia Counties into Augusta and then onto one of the twin bridges across the Savannah River into South Carolina.