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Lewis and Clark Caverns State Park is located in southeastern Jefferson Countymarker, Montanamarker. The primary feature of the park is its namesake cavern.

The cavern was discovered in 1892 by Dan A. Morrison. The site was first established as "Lewis and Clark Cavern National Monument" on May 11, 1908, but was not fully surveyed and declared until May 16, 1911 by President Taft as . The limestone cave is named after the explorers Meriwether Lewis and William Clark since the cavern overlooks over of the trail from the Lewis and Clark Expedition along the Jefferson River, although Lewis and Clark never saw the cavern. It is located approximately west of Bozeman, Montanamarker, and northwest from the northwest corner of Yellowstone National Parkmarker.

The caverns are also notable in that much of the work done to make the cave system accessible to tourists was performed by the New Deal-era Civilian Conservation Corps.

It was disbanded as a national monument on August 24, 1937, and transferred to the state of Montana. The site was formally dedicated as a state park in 1941, Montana's first state park.


Lewis and Clark Caverns was dissolved by slightly acid groundwater in tilted beds of the Madison Limestone of Mississippian age. Most of the cave was probably excavated during the ice ages, a time of much greater water supply than today.


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