Middle Fork Trail #4001 is a backcountry access point located at the Middle Fork Transfer Camp & Trailhead near Boundary Creek, offering toilet facilities, stock holding areas, and a ramp for pack animals.

The trail provides foot and horse access into the Frank Church River of No Return Wilderness along the Middle Fork Salmon River, though users should check current trail condition reports before attempting as portions may be flooded in spring and the trail experiences rockfall and downed trees.

This is a remote wilderness location requiring proper preparation including saw, shovel, first aid gear, and food/water supplies, with no cell service available.