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Upper Peninsula Regional Digitization Center

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    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Cranes using clam buckets remove overburden from within the tower caisson. As material was removed, resistance was lowered at the cutting edge of the caisson which allowed it to cut its way to bedrock. It worked like a cookie cutter.
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Photo shows the cutting edge of the tower caisson No. 19 during fabrication at Alpena, MI. Designed to work like a cookie cutter this caisson is filled with aggregate in the double wall area which acts as weight to drive it through the...

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