Needles Highway to Iron Mountain Road

The Needles Highway threads between towering granite spires that’ll have you questioning whether your rig will actually fit through the tunnels ahead. Built in the 1920s with tunnels barely wide enough for modern trucks, this route connects to Iron Mountain Road’s famous pigtail bridges and one-lane tunnels that frame Mount Rushmore through your windshield. The Eye of the Needle tunnel at 8 feet 4 inches wide separates drivers from wannabes real quick.

This is moderate technical driving requiring precise maneuvering and a cool head in tight spaces. High-clearance vehicles recommended, though stock SUVs can make it with careful spotting. Best driven May through October when snow doesn’t complicate the already challenging granite passages. No permits needed, but fuel up in Custer beforehand—you’ll be crawling through some sections. The payoff is pure Black Hills granite country that most tourists never see up close.