Natural Bridge State Park

About this park

Natural Bridge State Park protects a genuine geological rarity on just 48 acres in North Adams: the only naturally formed white marble arch anywhere in North America. Geologists date the bedrock marble to roughly 550 million years old, with the arch itself carved by glacial meltwater over the course of about 13,000 years, making it one of the clearest demonstrations of glacial erosion anywhere in New England. The arch spans rushing Hudson Brook as it tumbles through a steep, 60-foot-deep gorge, and the site also contains a man-made white marble dam, likewise believed to be the only one of its kind in North America. The area operated as an active commercial quarry from 1810 to 1947, producing the coarse-grained white marble used in local buildings and cemeteries throughout the Berkshires, before becoming a privately run roadside tourist attraction from 1950 to 1983. The Commonwealth acquired the site and made it a state park in 1985 specifically to preserve its unique geology. A wide, family-friendly walking trail follows the ridgeline of the old quarry, offering views across the surrounding Berkshire Hills, though direct access to the path beneath the bridge itself was closed in 2023 after the 70-year-old structure was deemed unsafe. The park operates seasonally from mid-May through mid-October and sits just a couple miles from downtown North Adams and the acclaimed MASS MoCA contemporary art museum, making it an easy add-on stop for visitors already exploring the city's cultural offerings.