Western explorer Joseph Walker has been historically credited with leading the first Anglo-American party to view Yosemite Valley in 1833. Secondary sources have recently questioned that distinction, in part because Zenas Leonard’s narrative, a chronicle for the Walker journey to and from the Rocky Mountains to the California coast, did not allow conformance with reasonable travel rates for the party via previous routing through the eastern Sierran foothills. This article asserts the veracity of the Walker party’s Yosemite Valley viewing, while modifying previous routing. Support for this assertion comes from event and location agreement by independent narratives or accounts regarding the Sierran journey by Leonard, explorer Lafayette Bunnell, party member George Nidever, and Joseph Walker himself. Changes in Sierran mapping between 1845 and 1848 by John Fremont, attributed to Walker’s influence, corroborate these narratives and accounts.
Patrick Vaughan (2026) studied this question.