Big Run (Of Gandy) Trailhead provides access to the Big Run Trail, a moderate 3. 2-mile hiking and mountain biking route that follows an old logging railroad grade along Big Run and connects to the Allegheny Mountain Trail system.

The trailhead parking area is located on Forest Road 112 and offers a relatively easy descent option for cyclists heading down to Gandy Creek, as well as access to the popular Big Run, North Prong, and Allegheny Mountain Trail Loop (approximately 8 miles).

An active beaver dam is located along Big Run Trail, and the area features a grassy double-track North Prong Trail that passes by a mountain meadow.