Moving materials during Mackinac Bridge construction

The derrick similar to those used atop the towers were set up to lift materials from barges to the roadway level before the deck was completed to the shore., Electronic reproduction of text.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: The derrick similar to those used atop the towers were set up to lift materials from barges to the roadway level before the deck was completed to the shore.
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1957 (approximate)