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Upper Peninsula Regional Digitization Center

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    • Tower caisson move

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • 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...
    • Second Bridge

    • Bridges, Portage Lake (Houghton County, Mich.)
    • This view of the second Portage Lake bridge build in 1895 was taken from the Houghton side. This two level bridge allows the train to use the lower level of the bridge to make its crossing. The upper deck is where autos and pedestrians cross...

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