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Upper Peninsula Regional Digitization Center

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    • Cable bent pier

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Pier 21, the north cable-bent piers, consists of a pair of circular foundations 50 feet in diameter founded on bedrock, 65 feet below the surface. Each concrete cylinder was topped with a pedestal 16 feet in diameter. The sheet piling used for...
    • Wreck of Portage Bridge

    • Bridges, Portage Lake (Houghton County, Mich.)
    • Photo taken from the Hancock side shows wreckage of the turntable span which was struck by a steamer that was attempting to pass through. Note the two levels clearly visible in the left. Lower level is for railroad and while the upper level is...

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