North Georgia's mixed-surface Swinging Bridge routes come 42 and 60 mile versions. Both cross the Tocoa river twice, on an antique non-swinging steel bridge in the quaint town of Aska and again on the cable suspended bridge which really does swing. The 60 mile version adds the infamous climb to Winding Stair Gap. Take a moment to visit the US Fish and Wildlife Service fish hatchery on Rock Creek Rd if you have the time. This is one of the prettiest routes in the state.
Set a few minutes west of Dahlonega, Georgia on some of the same roads used for the Southern Cross gravel race, the 47 mile Nimblewill Gap gravel route includes an unmaintained US Forest Service road over the gap from which the route takes its name. A mountain bike wouldn't be out of place on this route.