Tower going up

Tower continues going up.  Note the riveting platforms on each leg.  They to move up as the tower "grows"., Electronic reproduction of text.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: Tower continues going up. Note the riveting platforms on each leg. They to move up as the tower "grows".
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1955 (approximate)