Tower caisson

Ring No. 17 was added of the 20 required to pier 19, the north tower pier  (2), Electronic reproduction of photograph.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: Ring No. 17 was added of the 20 required to pier 19, the north tower pier (2)
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1955-01