This 1953 color slide was shot during our trip to South Dakota that summer. The internet tells us that the tunnel, located on U.S. 60 east of Superior, Arizona, was completed in 1952 which explains why the rock surrounding the entrance look freshly exposed to the elements.
[From my personal collection]
[Shell Highway Map of Arizona. 6-DD-1956-1. Source: David Rumsey Historical Map Collection]
It was serendipity that a car and trailer was just emerging from the tunnel at the moment Dad snapped this picture.*
You can see postcards of the tunnel here.
*Our rig was a red Dodge truck and Boles Aero trailer, seen here in South Dakota.
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