Tower parts pre-fab for Mackinac Bridge (1 of 7)

These tower were fabricated horizontally, on the ground, at the yards of American Bridge Div. Of U.S. Steel, at Ambridge, Pennsylvania, Electronic reproduction of photograph.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: These tower were fabricated horizontally, on the ground, at the yards of American Bridge Div. Of U.S. Steel, at Ambridge, Pennsylvania
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1955 (approximate)