This long and strenuous loop begins along the Big Run Portal Trail, offering beautiful views of the river at its greatest volume. Veering left on the Brown Mountain Trail, enjoy views of rocky cliffs and long-ranging vistas from the ridgeline. Approaching Skyline Drive, take a brief spur to the Brown Mountain Overlook before continuing along the Rocky Mountain Run Trail (aptly named for the towering Rocky Mountain just to the south). As this trail parallels the creek, enjoy the serenity of various springs and deciduous groves that cling to the edges of the water. When the trail intersects with the Big Run Portal Trail, make a right. This final stint along Big Run is similarly beautiful, with several impromptu fords necessary to make it back to the parking area.