American Bridge's Ambridge plant, at that time the largest structural steel fabricating plant in the world, fabricated the bridge's towers.
According to the Mackinac Bridge Authority,
The towers were fitted together horizontally at Ambridge, PA., taken apart and shipped by rail to St. Ignace (MI). The pieces were then placed on a barge and towed to the site and the creeper set them in place. This was like putting together a puzzle.
I'm not sure what phase of fabrication the photos below show. Maybe someone who knows more about this project can provide some helpful descriptions.
Fabrication of Mackinac Bridge towers American Bridge Co., Ambridge circa 1955 credit: Mackinac Bridge Authority |
Fabrication of Mackinac Bridge towers American Bridge Co., Ambridge circa 1955 credit: Mackinac Bridge Authority |
Fabrication of Mackinac Bridge towers American Bridge Co., Ambridge circa 1955 credit: Mackinac Bridge Authority |
Fabrication of Mackinac Bridge towers American Bridge Co., Ambridge circa 1955 credit: Mackinac Bridge Authority |
Fabrication of Mackinac Bridge towers American Bridge Co., Ambridge circa 1955 credit: Mackinac Bridge Authority |
Fabrication of Mackinac Bridge towers American Bridge Co., Ambridge circa 1955 credit: Mackinac Bridge Authority |
The plant was closed for virtually all production in mid-1982, and closed for good in the spring of 1984.
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