State Route 166 Former state routes in Arizona
state route 166, known sr 166, state highway in north-central part of arizona, starting @ junction u.s. route 66 , ended @ walnut canyon national monument. first appeared on state map in 1957 , decommissioned in 1970 when route through national monument taken on forest service. appeared in older state maps on route winslow second mesa. known winslow-toreva highway, route became part of state route 65, state route 87. there historical marker highway north of winslow.
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