Tower caisson for the Mackinac Bridge (28 of 45)

The first section of a tower caisson (caisson No. 20) is fabricated at Alpena, MI and ready to be towed to the construction site.  But first a channel must be dug to Lake Huron (background)., Electronic reproduction of photograph.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: The first section of a tower caisson (caisson No. 20) is fabricated at Alpena, MI and ready to be towed to the construction site. But first a channel must be dug to Lake Huron (background).
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1954 (approximate)