A - There are three tunnels on Rim Rock Drive. There are two tunnels on the west side and one on the east side of the park. Heights: The clearance above the lanes of traffic ranges from a low point of 10'6' two feet near the edge of the curb to a maximum of 16' above the centerline of the road. Lengths: The east tunnel has a length of 530 feet. The lower west tunnel has a length of 236 feet, while the upper west tunnel has a length of 182 feet.