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.