To get to Mt. Rushmore and the Roosevelt Inn from the east, take Exit 61 off of I-90 just east of Rapid City. This is is the junction with the US16 Truck Route. As you exit the Interstate, you will make a left turn (south) and follow the truck route for about 7 miles to the junction with US16. Follow US16 west for about 18 miles to the junction of US16A (The road to Mt. Rushmore). Follow US16A into the town of Keystone. When you see the town's only traffic light, proceed straight for 1/2 mile toward Mt. Rushmore. The Roosevelt Inn will be on the left side of the road about a quarter mile before you enter the Mt. Rushmore boundary.
To get to the Roosevelt Inn from the west, go to Mt. Rusmore then drive down the hill into Keystone. The Roosevelt Inn will be the first building you see. If you happen to find yourself in Custer, SD, do not follow the signs to Keystone. The shortest route is to take US385 North to SD244 East which is the route to Mt. Rushmore. The signs in Custer direct you via US16A which, though scenic, is a considerably longer route.
From the South, if you are driving north on SD 79 (now called the Heartland Expressway), turn East onto SD 40 at Hermosa. Follow SD 40 approximately 13 miles into Keystone and turn left at the traffic light. Go approximately 1/2 mile.
Note: Mapquest will misplace the Roosevelt Inn, showing the location about a mile down Old Cemetery Road. We are actually located right at the junction with US Highway 16A. Google also has issues. The entry for Roosevelt Inn works. The one for The Roosevelt Inn doesn't. By the way therre is no "the" "thy" or "thou" in our name.