Stiffening trusses for the Mackinac Bridge (60 of 67)

The historic passenger steamer "South American" passes under the bridge as preparations are made to hoist stiffening trusses into place, Electronic reproduction of text.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: The historic passenger steamer "South American" passes under the bridge as preparations are made to hoist stiffening trusses into place
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1957 (approximate)