Trail Creek Road Access provides entry to the Big Lost River area via a challenging 80-mile gravel route from Sun Valley that is only passable during summer months.

The road features steep drop-offs, rockslides, and washouts, making it unsuitable for heavy vehicles or trailers; dispersed camping and designated campgrounds are available at turnoffs along the route.

This access point serves as a gateway to outdoor recreation including hiking, rock climbing, and fishing in the remote Big Lost Valley region.