Lewis & Clark Caverns in Three Forks

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Lewis & Clark Caverns in Three Forks

While Lewis and Clark themselves never visited the site, each day an average of 600 visitors from around the world tour the Lewis and Clark Caverns in Montana's first state park.

  • Montana's first state park is best known for its limestone cave complex, one of the largest in the Northwest.
  • Two-hour tours offered May 1 through September 30 and candle-light tours available in December. Dress for the 50° F air temperatures inside the cave, and be prepared to stoop, bend and navigate about 600 steps.
  • Park includes hiking trails, visitors center, facilities for picnickers and campers, and more.


Lewis and Clark Caverns State Park encompasses about 3,000 acres and features one of the largest cave complexes in the Northwest. Created over thousands of years by slightly acidic groundwater dissolving ancient limestone, the Lewis and Clark Caverns offer many of the classic "speleothems" or cave formations – stalagmites and stalactites, dripstone columns and flowstone ribbons – as well as unusual features such as "popcorn" and helictites. These fantastical caverns are a great way for young and old to learn about geology and to experience the World Without Light.


Located 19 miles west of Three Forks, 17 miles east of Whitehall, on Montana Hwy. 2. From Big Sky, drive 34 miles north on U.S. 191 to I-90; drive west, toward Butte, Montana, for 23 miles to Exit 274; drive south on US 287 to the junction with Montana Highway 2, about 11 miles; continue on MT 2 about 5 miles. The park and campgrounds are on the right.


Park open year-round; two-hour guided tours of caves offered May 1-Sept. 30. Winter candle-light tours are available in December.


Tour fees: $12 for adults 12 and over, $5 for children 6-11, free for children under 6. Winter Candlelight Tours: $15 for adults 12 and over, $8 for children 6-11.

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Lewis and Clark Caverns State Park also features a campground with conveniences, hiking trails, fishing access, and a visitor center.


The entrance to this stunning cave sits about 1,400 feet above the Jefferson River, which the famed leaders of the "Corps of Discovery" paddled in 1805, unaware of the nearby wonder. Native Americans knew of the cave, but non-natives didn't discover it until 1882. In 1892, two hunters rediscovered it, returning six years later to explore.

A local miner, Dan Morrison, developed the caverns for the public around 1900, building 2,000 wooden stairs inside, and named it "Limespur Cave." Shortly thereafter, however, the railroad laid claim to the land only to pass it to the U.S. government in 1908, whereupon President Theodore Roosevelt declared it the nation's 15th national monument and named it after the explorers. In 1937, the land was transferred to Montana's State Park System to become Montana’s first state park.