Percy Jones, Jr., born in 1888, was the chief locating engineer who personally located more miles of Arizona highways than any other person. His college training in mining and geology, combined with the instincts of a pioneer desert traveler, gave him unusual ability in pushing roads across undeveloped country. The drive through Salt River Canyon on U.S. 60 was considered a high point of his career as a born locator. He worked for the Arizona Highway Department for a year before entering World War I in 1917, returned in 1925, became chief locating engineer in 1931, served until 1948, and was called back in 1955 for three more years to troubleshoot corridors for the new billion dollar interstate system.