Following the completion of the Williams bypass in 1984, ADOT approved a plan to deal with the remains of the highway in Arizona. All of US 66 in Arizona was no longer recognized as an active U.S. Highway. The sections of US 66 that were not concurrent with I-40 were re-designated as multiple Business Loops of I-40 and the section of highway from Kingman to Seligman was re-designated State Route 66. The section from Seligman to Crookton was abandoned to Yavapai County. On June 26, 1985, AASHTO approved a request by the states of Arizona, New Mexico, Texas, Oklahoma, Kansas and Missouri to retire the US 66 designation from the U.S. Highway System.