Mount Rushmore National Memorial, the most visited park in the network, lies in the central Black Hills of southwestern South Dakota. Although most visitors come to see the sculpture, Mount Rushmore is quite rich in natural resources. Its steep canyons, cliff faces, and rocky outcroppings host a variety of wildflowers, birds, bats, and butterflies. The park also hosts stands of old growth ponderosa pine, a unique and valuable resource since much of the surrounding Black Hills has been logged.
As is the case in many other network parks, controlling the spread of exotic plants and fire management are priorities for the park. Another major natural resource concern is the mountain pine beetle. This species can quickly kill entire stands of pines, threatening the old growth ponderosa pines as well as the integrity of the trees throughout the park as a whole.