Trail Creek Rd Access provides entry to a scenic 70-mile mostly-gravel road through central Idaho that connects Sun Valley to Challis, following the Big Lost River area.

The rough, minimally-maintained road is only passable during summer months (typically May through September) and features steep drop-offs, rockslides, and washouts, making it unsuitable for heavy vehicles or trailers.

Access to dispersed camping and several developed campgrounds (including Wildhorse Campground at 7,400 feet) is available along the route, though facilities are basic and water is summer-only.