Arizona State Route 86 to leaving the reservation. SR 86 curves towards the east as it enters Tucson. In Tucson, the highway continues east past an interchange with I-19 to 16th Avenue, which serves as its eastern terminus. SR 86 was originally designated in 1930, between Willcox and Bowie. In 1931, it was extended west to Benson and east to the New Mexico state line, effectively serving as a direct bypass to the US 80 Douglas loop. From 1927 to 1960, the remainder of the bypass between the Arizona border and Road Forks, New Mexico was served by New Mexico State Road 14. SR
Arizona State Route 66 line, much of US 66 has been replaced with I-40. Various stretches of the old highway exist as frontage roads and business loops of I-40. In 1984, US 66 was officially removed from the state highway system of Arizona. Most of the old highway had been replaced by I-40, but the portion between Kingman and Seligman where I-40 followed a new alignment to the south became SR 66. In 1990, the state turned over the easternmost of SR 66 (known as Crookton Rd) to Yavapai County for maintenance. Arizona State Route 66 State Route 66 (SR 66) is a surface