Moving tower caisson for the Mackinac Bridge (6 of 11)

Depth lines painted onto the caisson section allows the crew to know when it is ready to float. These marks are used like the load lines on a ship. Like a ship, these sections had to have concrete ballast placed inside so they would float upright and ride properly to the bridge site., Electronic reproduction of photograph. The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: Depth lines painted onto the caisson section allows the crew to know when it is ready to float. These marks are used like the load lines on a ship. Like a ship, these sections had to have concrete ballast placed inside so they would float upright and ride properly to the bridge site.
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1954 (approximate)
Title: Moving tower caisson for the Mackinac Bridge (6 of 11).
Name(s): Superiorland Library Cooperative, contributor
Mackinac Bridge Authority, contributor
Type of Resource: still image
Date Created: 1954 (approximate)
Physical Form: photographs
Extent: 1 item
Abstract/Description: Depth lines painted onto the caisson section allows the crew to know when it is ready to float. These marks are used like the load lines on a ship. Like a ship, these sections had to have concrete ballast placed inside so they would float upright and ride properly to the bridge site.
Note(s):

Electronic reproduction of photograph. The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Held by: Superiorland Library Cooperative
Restrictions on Access: In copyright (http://rightsstatements.org/vocab/InC/1.0/)
Is Part Of: Mackinac Bridge Authority photographs. Identifier: SLC-011
In Collections: