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
White River (Arizona) White River (Arizona) The White River is a tributary of the Salt River in the U.S. state of Arizona. Formed by two forks that drain part of the White Mountains, it begins in Navajo County and ends in Gila County, where it meets the Black River to form the Salt River. The White River lies entirely within the Fort Apache Indian Reservation in the east-central part of the state. The North Fork White River and the East Fork White River merge near Fort Apache to form the main stem, which continues generally southwest to its confluence with the Black River.