May 21, 2023




Clark's signature and date, July 25, 1806 is inscribed on the wall. Clark wrote that he climbed the sandstone pillar and "had a most extensive view in every direction on the Northerly Side of the river". He named the outcropping after Jean Baptiste Charbonneau—the son of expedition member Sacagawea—whom he nicknamed "Pompey". His original name for it was "Pompey's Tower"; it was changed to the current title in 1814.



Yellow-bellied marmot

Gopher/Bull Snake