New Hampshire Route 112 follows the Lost River from Kinsman Notch to Moosilauke Brook. Hotels near Lost River Gorge and Boulder Caves, Hotels near White Mountains Visitor Center, Hotels near (LEB) Lebanon Regional Airport, Things to do near Lost River Gorge and Boulder Caves, SledVentures Snowmobile Rentals and Tours, Game & Entertainment Centers in Woodstock, Lost River Gorge and Boulder Caves: Tickets & Tours‎, White Mountains Visitor Center: Tickets & Tours‎, Kancamagus Collectables: Tickets & Tours‎, Jack O'Lantern Resort Golf Course: Tickets & Tours‎. Kids enjoyed crawling through caves and between rocks. not available built in . 1 Reviews (603) 745-5044 Website. I have lived in NH for all of my 57 years and have seen many advertisements for Lost River in my life. The gorge is owned by the Society for the Protection of New Hampshire Forests and is operated as a tourist attraction, with trails and ladders accessing many of the caves. Help. I wish we had brought our children here when they were. The Lost River begins on the eastern slopes of Mount Moosilauke below the peak of Mount Jim and above Kinsman Notch, one of the major passes through the White Mountains. Stick to the tour route & speed limit for the best experience. Legal.