Main Boulder Road Fishing Access Site provides hand launch access to the Boulder River approximately 3. 5 miles south of Big Timber via Old Boulder Road, with basic amenities including camping, toilet facilities, and parking.

This undeveloped site serves as a primary access point for anglers and paddlers on the Boulder River, a blue-ribbon trout stream known for outstanding fishery values.

The location offers primitive camping and is suitable for those seeking a more rustic access experience compared to developed facilities.