AZ 166
State Route 166 was an access road to Walnut Canyon National Monument from US 66. On older maps, SR 166 appears on a route from Winslow to Second Mesa which became SR 65 which then became SR 87.
Length: 3 miles
Existed: 1957-1970
Historical Route: Walnut Canyon National Monument to US 66
Major Junctions: US 66
Page last updated: 2/23/2022