Truss assembly on the Mackinac Bridge (4 of 7)

The roadway trusses were built in-place.  Here a derrick lifts materials into place, Electronic reproduction of text.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: The roadway trusses were built in-place. Here a derrick lifts materials into place
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1956 (approximate)