Twelve Mile Dam Fishing Access Site on the Tongue River, 13 miles south of Miles City, offers free primitive camping with vault toilets, an ADA-accessible fishing pier, and a boat launch.

The site features multiple level campsites with fire rings and picnic tables, well-maintained grassy areas, and river access via maintained paths, though there is no potable water or trash service. First-come, first-served with a 7-night maximum stay limit.