Corral for Mackinac Bridge (2 of 6)

One of four corrals being unload from a barge.  It then stood on the bottom of the Straits of Mackinac and was used to guide the pier caisson as it went into position.  Surveyors guided this operation through triangulation from the seven survey towers located through the Straights., Electronic reproduction of photograph.  The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: One of four corrals being unload from a barge. It then stood on the bottom of the Straits of Mackinac and was used to guide the pier caisson as it went into position. Surveyors guided this operation through triangulation from the seven survey towers located through the Straights.
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1954 (approximate)