Iron Mountain Road (US-16A)
US-16A between Custer State Park and Mount Rushmore packs 314 curves, 14 switchbacks, three wooden pigtail bridges, and three single-lane tunnels engineered to frame Mount Rushmore in the windshield. Ride it south-to-north for the tunnel framing, and expect heavy tourist traffic in summer.
What you'll hit along the way.
Rider-verified stops, overlooks, fuel, and the corners worth knowing about — in the order you'll meet them.
Custer, SD
Western end of US-16A with full services — fuel and food before entering Custer State Park.
Mount Rushmore National Memorial
The memorial the road's tunnels were designed to frame; paid parking structure at the entrance.
Keystone, SD
Northern terminus town below Rushmore — fuel, food, and lodging, but crowded during peak season.
No runs logged on this road yet — be the first.
Runs are rider-logged & GPS-traced in the app
Ride your own ride — times are rider-logged & GPS-traced, never a race on public roads.
Shot by the riders who've run it.
Riders upload photos to their profile and tag the road or stop — tagged shots show up here automatically.