Stories, Riverside, CA, 1984. LOC catalog number: 84–72920. Lech, Steve. Along the Old Roads: A History of the Portion of Southern California that became Riverside County 1772-1893, Riverside, CA, 2004. External links San Gorgonio Pass Historical Society website Mountain passes of California Rail mountain passes of the United States Landforms of Riverside County, California Beaumont, California Cabazon, California Bradshaw Trail Interstate 10 U.S. Route 99 U.S. Route 70 U.S. Route 60 Southern Pacific Railroad