Roads in Grand Teton National Park were designed to accommodate visitors in automobiles, and most visitors travel through the park in this way. But with narrow or nonexistent shoulders, roads present a challenge for those wishing to travel through the park in other ways (Conflict). To increase...

Denali National Park and Preserve offers visitors the premier opportunity in North America to see large concentrations of charismatic wildlife, including grizzly bears and wolves. The park is managed in ways that allow visitor access but guard against wildlife disturbance (Impacts to wildlife) and...

The road serving Zion Canyon - the scenic heart of Zion National Park - was often congested, and parking lots overflowed (Impacts to roads/parking; Impacts to attraction sites; Crowding; Conflict). This made the Canyon noisy (Impacts to natural quiet), and unauthorized parking along the road...

A wondrous display of synchronous fireflies at Great Smoky Mountains National Park draws many visitors to the park each spring. However, the small viewing area and limited number of days over which this natural event takes place challenges the National Park Service to prevent associated resource...

On peak summer days, thousands of hikers can be found along the extensive and diverse trail system in Acadia National Park. The collective use by so many visitors can take a toll on trail resources. Some visitors alter and build rock cairns; walk off-trail to avoid rocks, roots, and wet spots; and...