Historic Site Plaque--Mackinac Straits

Plaque denotes Mackinac Straits as a Michigan Historic site, Electronic reproduction of text.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: Plaque denotes Mackinac Straits as a Michigan Historic site
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1957 (approximate)