The bridge above Little River also marks the city limits dividing Roswell and Milton in north Fulton County on the east end of the bridge and unincorporated east Cherokee County on the west end of the bridge.
The bridge is expected to be completed in January 2019, according to the Georgia Department of Transportation. Posts at both ends of the current bridge are dated 1952.
The new bridge will be wider and higher above the ground than the current bridge. The road will remain two lanes, according to Georgia transportation officials. The bridge will be wide enough to include a 10-foot shoulder.
The bridge is expected to be completed around Nov. 30.
RELATED: What's up with the castle guarded by dwarves or garden gnomes on Arnold Mill Road?
MAP: Arnold Mill Road at the Milton / Cherokee County line