Pompeys Pillar National Monument overlooks the Yellowstone River, approximately 25 miles east of Billings, Montana. Pompeys Pillar is a sandstone butte that bears the signature of Captain William Clark of the Lewis and Clark Expedition, and the date, July 25, 1806, when he passed along the Yellowstone during his return journey. Although Captain Clark referred to this sandstone outcropping in journal as Pompeys Tower, it may have named in honor of Jean Baptiste Charbonneau, Sacagawea’s son, whom he had given the nickname “Pomp.”
The Pompeys Pillar Interpretive Center opened in 2006 and provides exhibits related to Clark’s 1806 journey through the Yellowstone Valley. The 5,700-square foot center also highlights native culture, flora, fauna, the story of the Corps of Discovery expedition, and the historical legacy of Pompeys Pillar. A gift store, operated by the Friends of Pompeys Pillar, is also located at the interpretive center.
Pompeys Pillar National
Monument Mailing Address 5001 Southgate Drive Billings, MT 59101 US, Monument Physical Address 3039 US Highway 312 Pompeys Pillar, MT 59064 US