Tower caisson for the Mackinac Bridge (44 of 45)

Finishing up on ring number 16 to be used on the tower caisson at pier 19 (2), Electronic reproduction of photograph.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: Finishing up on ring number 16 to be used on the tower caisson at pier 19 (2)
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1954 (approximate)