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Upper Peninsula Regional Digitization Center

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  • All fields: rings
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    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Engineers inspect as crewmen work on the assembly of the tower caisson rings. They are standing on ring 8-20. This is ring number eight of the twenty in the finished unit.
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Engineers inspect as crewmen work on the assembly of the tower caisson rings. They are standing on ring 8-20. This is ring number eight of the twenty in the finished unit.
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Adding the next double walled steel ring. As rings were added the space between the two walls was filled with aggregate and the center was dredged. This action caused the caisson to cut its way through the overburden and eventually reach...

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