Detailed map of the Sierra Nevada Range, extending from Walker's Pass to "New Pass" in Los Angeles County.
Walker Pass was one of the earliest routes from the Mojave Desert to the San Joaquin Valley. The pass was first charted in 1834 by Joseph Redford Walker, a member of the Bonneville Expedition. Walker utilized the pass again in 1843, when he led the first immigrant wagon train to California. The Pass was first surveyed by John C. Fremont in 1845, who named the pass after Walker. The map provides a detailed treatment of the topographical features in the Southern Sierras, including a remarkably detailed treatment of the sparsely traveled road system in region. Fort Tejon appears in the Center of the map, the epicenter of travel between Southern California and the Valley, both in the 1850s and in modern times.