to Yavapai County in 1990 for maintenance. Old US 66 continued in a straight southeasterly direction for , then made a long curve south and east around a large volcanic bluff. After curving around the bluff, US 66 continued into Seligman, becoming Chino Street (today part of the Seligman I-40 Business Loop) into the center of town. Seligman is the birthplace of the first Historic Route 66 Association of Arizona, established by local barber Angel Delgadillo in 1987. The association obtained the first "Historic Route 66" designation, which the state initially placed on the segment of US 66 between Kingman and Seligman. East of Seligman, old US 66 diverged from the current business route. Where the business route turns south to return to I-40, US 66 headed southeast on Crookton Road. US 66 proceeded to follow Crookton Road through high desert towards Ash Fork. Seligman to Williams From Seligman, US 66 continued heading southeast for on Crookton Road. At I-40 exit 139, the highway briefly took on the route of the present-day Interstate, but curved southeast less than a mile later onto the south frontage road. The volcanic cinder asphalt road curved northeast from the Interstate and crossed over a small three-span concrete bridge, rejoining I-40 where the frontage road curves east. In the same spot as present day exit 144, US 66 curved northeast, taking Pine Avenue into downtown Ash Fork. US 66 continued straight onto 8th Street where Pine Avenue turned east, then made a right-hand curve onto Lewis Avenue. Today, Lewis Avenue is a one-way street, heading westbound only. Traffic heading east through Ash Fork must take Park Avenue, one block to the south. Both Lewis and Park make up a one-way pair carrying I-40 Business through town. At the spot where the I-40 Business Loop turns south to become SR 89, there used to be an intersection where US 66 met at a junction with US 89. US 89 shared a wrong-way concurrency with US 66 between Ash Fork and Flagstaff. Both US 66 and northbound US 89 continued straight east from this intersection on to a highway alignment which no longer exists. The former highway straddled the north side of I-40, at times, often joining and leaving the present westbound lanes of the Interstate. East of Ash Fork, the route left the high desert terrain and entered a mountainous area, covered with Ponderosa pine forests.