"That's a 1 lane 13'7" railroad underpass. Not a big deal, just be sure of your height."
I've followed many, many semi-truck-trailers under that trestle for a few decades (and that's two lane road, meaning one lane in each direction). But if it's a concern, one can always run US411 down to 136 and loop back up to US76 on Old US411
We will be there for 3 nights starting the 15th of September. Our route out heading to Pigeon Forge is expected to be US 76 to I75. RV Trip Wizard did not have any issues with that. WE are 13' 1". 44" Towing a Blazer.
I-75 S to the Rocky Face exit (Ex # 336). Take the US41/76 bypass around Dalton. Stay on US76E to Chatsworth. Turn S onto US411/76 at Ramhurst traffic light (Sunoco gas station on left) hang a left then a right to stay on US76. Go under the trestle and turn left to stay on US76. Once you go past the Food Lion (on your right) in Ellijay, turn right at the light onto 515 to go South. Go left on the road next to the Wal-Mart. Go slow thru Chatsworth. Sometimes it's a tight squeeze, other times it's no problem. But the Dalton & Chatsworth cops will pull you in a heartbeat.