Coosawattee River Bridge Carters Dam This through-truss bridge spans the Coosawattee River just below Old Hwy. 411 and Carters Dam. Located on the "New Line" of the former L&N Railroad, it is now in use by CSX. RailGa.com. Georgia's Railroad History & Heritage. © Steve Storey Railroad History | The Depot List | Locomotives On Display | Odds & Ends | Sources & References | Home