Modernized transportation in Coachella Valley dates back to the days of the Bradshaw Trail which was a stage route originating in San Bernardino which crossed through the Sonoran Desert east to the Colorado River. During the California Gold Rush the Bradshaw Trail was plotted through the Sonoran Desert by William D. Bradshaw. The Bradshaw Trail was plotted in 1862 through the Coachella Valley and Sonoran Desert east over the Colorado River to a new mining strike found in La Paz, Arizona. Bradshaw consulted the Cahuilla Tribe who advised him of the best route east of the Salton Sink between the Orocopia Mountains and Chocolate Mountains. More information regarding the Bradshaw Trail and where to find it can be found on desertusa.com.
Below the Bradshaw Trail can be seen aligned through Coachella Valley (shown as Cabazon Valley) on the 1873 Bancroft's Map of California, Nevada, Utah and Arizona
The California State Highway Engineer submitted a recommended routing of US Route 60 to the AASHO Executive Secretary on September 8, 1931. The route description of US Route 60 show as ending in Los Angeles by way of Pomona at an undisclosed terminus. The routing of US Route 60 defined it as entering Coachella Valley via LRN 64 through Box Canyon to Mecca towards Coachella. From Coachella US Route 60 joined US Route 99/LRN 26 passing through Coachella Valley towards San Gorgonio Pass.
A letter dated June 2, 1939, from the AASHO Executive Secretary to the State Highway engineers of; California, Nevada, Oregon and Idaho noted the proposed alignment of US Route 95 south to Blythe, California. A separate letter to the Nevada State Highway Engineer notes that a last-minute request was made to extend US Route 93 south of Las Vegas to the California State Line via Searchlight over Nevada State Route 5 instead of US Route 95.