From the Mt.Rushmore site--
park fees includes:
There is no entrance fee for Mount Rushmore National Memorial. However, fees are required to park at the memorial.
Parking is readily available in the memorial's parking complex, which is managed by Presidential Parking, Inc. This park concession operates under a contract between the National Park Service and the Mount Rushmore Society, which constructed the parking facility and continues to operate and maintain it. No federal funding was used to construct the parking facility. A parking fee is assessed to offset the expenses of construction, operation and maintenance of the parking facility. This parking permit entitles a non-commercial vehicle unlimited entry to the memorial for the calendar year.
The America The Beautiful - The National Parks and Federal Recreational Lands Pass, the Senior Pass and the Access Pass cannot be used for parking fees at Mount Rushmore National Memorial. These passes cover entrance fees and in some cases provide a discount on special use fees such as camping and tours, but do not cover concession fees such as parking.
Cars, Motorcycles and RVs $11 per vehicle
Commercial Tour Bus $50*
Verified, nonprofit Educational Bus $25*
*Parking passes for buses are valid for 24 hours from time of first entry.
Parking fees may be paid with cash, traveler's check, or local personal check. Credit cards are not currently accepted.
No reservations are needed to visit the memorial. Parking for vehicles pulling trailers or extra long vehicles is extremely limited.
For questions concerning parking and parking fees, please call Presidential Parking, Inc. at (605) 574-2643.