On 8 January 1806, Clark took a trip over the summit, where he remarked, "...from this point I beheld the grandest and most pleasing prospects which my eyes ever surveyed..."[3] Lewis originally named the summit "Clark's Mountain and Point of View."

However, the name didn't catch on and the entire promontory was later called Tillamook Head.

[3] In the early 2000s, the Oregon Chapter of the Lewis and Clark Trail Heritage Foundation campaigned to officially name the highest point on Tillamook Head "Clark's Mountain".

[3] Clark's Mountain is notable for being one of five American federally-recognized place names with a possessive apostrophe.

[a] The U.S. Board on Geographic Names allowed the apostrophe as a way to emphasize the tribute to William Clark.