Interstate 10 in Arizona 2013. The remainder of the old US 80 section was rebuilt to interstate standards, with completion in 2014. East of Tucson, I‑10 parallels and in some cases overlies old US 80 to Benson, and was originally co-signed as US 80 and SR 86. The section of I-10 from Valencia Road to Rita Road was the first construction project in the state of Arizona funded by the Federal Aid Highway Act of 1956. Construction began in 1957 and was completed in 1960. From Benson, the Interstate follows the Southern Pacific mainline east through Willcox and Bowie to New Mexico, rather than
Arizona State Route 260 eastern Rim. It is also closed during winter storms because of its elevation changes between Payson and Show Low. SR 260 was originally designated in 1955 as SR 160 from Payson to Show Low. In 1969, US 160 extended into Arizona, so SR 160 was renumbered to SR 260 to avoid confusion. In 1972, it extended east to Eagar, replacing SR 173 and part of SR 73. On December 15, 1989, SR 260 extended west to Cottonwood over SR 279. Arizona State Route 260 State Route 260, also known as SR 260, is a major east–west state highway in north-central