The scenic, yellow-blazed Koppenhaver Trail in Pine Grove Furnace State Park begins at the far end of Fuller Lake behind the bathhouse. Follow the paved/gravel trail around the hill behind the bathhouse. On the left, before crossing the creek, is a grassy area. The trailhead is in th emiddle of the tree line parallel to the gravel path.This 1-mile loop crosses Tom’s Run and passes through stands of mature pines and hemlocks.
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