US 70, in concurrency with US 25, enters from Tennessee as a two-lane mountain highway meandering through the Bald Mountains. In Hot Springs it crosses the French Broad River and the Appalachian Trail, then goes northeasterly through Tanyard Gap to Hurricane. Proceeding south, it goes through the Walnut Mountains and then joins NC 213 near Walnut. Continuing on a more southeasterly routing, it becomes the US 25 Bus./US 70 Bus. split-off towards downtown Marshall at Mashburn Gap. At the Hayes Run Road interchange, NC 213 splits and continues towards Mars Hill. Before US 25 Bus./US 70 Bus. rejoins at Ivy River Road, the highway widens to four lanes; afterwards, it follows along Ivy Creek before crossing the Madison/Buncombe county line.