Guard Walls and the Park Road System

Crater Rim Historic District. All of the guard walls constructed along Crater Rim Drive conformed to the specifications for the Type 2 guard wall developed by the NPS landscape department. The plan for the loop road was part of a service-wide initiative to develop master plans for all parks. The NPS approached park planning with a more cohesive vision, and the specifics of the road design conformed to agency standards.