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
Former state routes in Arizona decertified. It was instead extended to US 66. The road up to the dam site still exists today as a county route. It was the only spur route of State Route 72. In 1962, this route became part of State Route 95. State Route 173 was a north-south state highway in north-central Arizona, that connected Show Low and McNary Jct., now known as Hon Dah. The route and travels along part of the Mogollon Rim. It first appeared on a state map in 1946 and became part of State Route 260 in 1972. This route was a spur of State