NO. 647 BUTTERFIELD OVERLAND MAIL ROUTE - This pass, Puerta, between the desert and the cooler valleys to the north, was used by the Mormon Battalion, Kearny's Army of the West, the Butterfield Overland Mail stages, and emigrants who eventually settled the West. The eroded scar on the left was the route of the Butterfield stages, 1858-1861. The road on the right served as a county road until recent years.
Blair Valley, 0.5 Miles Eastof County Road S2 (Milepost 23.0), 5.8 Miles South of Highway 78