The gorge was formed approximately 25,000 years ago by glacial meltwater scouring the bedrock.
The 'Lemon Squeezer' is a famous tight passage within the boulder field that requires maneuvering through a narrow rock crevice.
The river that creates the gorge is actually a tributary of the Pemigewasset River.
The caves are categorized as talus caves, created by rockfall rather than limestone dissolution.
The site was historically promoted as a tourist attraction as early as the mid-19th century.
Lost River Gorge & Boulder Caves features a boardwalk system winding through a glacial gorge carved during the last ice age. The site is defined by a series of talus caves formed by massive granite boulders that fell into the ravine. Visitors navigate a one-mile trail that includes staircases, boardwalks, and optional tight passages through caves such as the Lemon Squeezer and the Hall of Ships. The Lost River itself flows underground beneath the boulder piles, emerging at various points along the canyon floor. The area includes a forest adventure trail and a suspension bridge providing views of the gorge from above. It is located in Kinsman Notch, part of the White Mountain National Forest. The site is a privately managed attraction that requires visitors to follow a one-way loop through the geological features.
The suspension bridge overlooking the deep, forested ravine.
Wear sturdy, closed-toe footwear with good grip, as boardwalks and rocks can be slippery.
Bring a light jacket, as the temperature inside the gorge and caves is significantly lower than the surface.
Complete the entire boardwalk trail before entering the caves, as the path is one-way.
Skipping the boardwalk sections to head straight for the caves; the full experience requires navigating the gorge in order.
Open seasonally from mid-spring through late autumn; closed during winter months due to ice accumulation.
No pets allowed on the gorge trails. Do not climb on fragile moss-covered rocks outside marked paths.
