Mackinac Bridge construction during winter (37 of 48)

A marker is placed in the ice to keep track of its movement, Electronic reproduction of photograph.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: A marker is placed in the ice to keep track of its movement
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1955 (approximate)