US 16A and SD 36 in Custer State Park. Along the highway….

This winding road runs between Mount Rushmore National Memorial and the junction of US 16A and SD 36 in Custer State Park. Along the highway….

Iron Mountain Road
✅ 17 Miles
✅ 314 Curves
✅ 14 Switchbacks
✅ 2 Pigtails
✅ 3 Tunnels
✅ 2 Splits
✅ 4 President