Pompey's Pillar

Pompey's Pillar

Located in Yellowstone County, Montana, the pillar stands 150 feet above the Yellowstone River. It was designated a National Monument in January of 2001.

William Clark's Signature

Co-leader of the Lewis and Clark Expedition. His signature, with the date of July 25, 1806, is the only remaining physical evidence found along the route that the expedition traveled.

The Yellowstone River
The pillar was named after Jean Baptiste Charbonneau, the son of expedition member Sacagawea, whom Clark nicknamed Pompy. It was changed from Pompy's Tower to Pompey's Pillar in 1814.