From the plaque:
Long ago, Mohave Indians
used a network of pathways to cross the Mojave Desert.
In 1826, American trapper Jedediah Smith used their paths
and became the first non-Indian to reach the California
coast overland from mid-America. The paths were worked
into a military wagon road in 1859. This 'Mojave Road'
remained a major link between Los Angeles and points east
until a railway crossed the desert in 1883.
Plaque placed by the State Department of Parks and Recreation in cooperation with Billy Holcomb Chapter of E Clampus Vitus, Bureau of Land Management and Mojave River Valley Museum Association. October 9, 1988.