Survey tower in the Straits of Mackinac (3 of 5)

Engineers take sightings from one of the survey towers located in the straits area, Electronic reproduction of photograph.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: Engineers take sightings from one of the survey towers located in the straits area
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1954 (approximate)