Survey tower in the Straits of Mackinac (2 of 5)

One of the seven survey towers located through out the straights area, Electronic reproduction of photograph.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: One of the seven survey towers located through out the straights area
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1954 (approximate)