Towers for the Mackinac Bridge going up (7 of 50)

Using the barge mounted derrick to set the first sections of the towers was slow going as there was a constant effect of wind, water currents and waves.  Slipping these sections over the bolts required much time and expert equipment operator skills.`, Electronic reproduction of text.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: Using the barge mounted derrick to set the first sections of the towers was slow going as there was a constant effect of wind, water currents and waves. Slipping these sections over the bolts required much time and expert equipment operator skills.`
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1955 (approximate)