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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...
    • Terrible ride

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company
    • Source: The Mining Journal
      Marquette, Mi.
      February 18, 1888
      Saturday

      A Terrible Ride

      At 7:30 Thursday evening that thrilling locomotive shriek was heard which instantly told people in Marquette that there...
    • E. E. Lee has resigned

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company

    • Source: The Daily Mining Journal
      Marquette, Mi.
      July 11, 1888
      Wednesday

      Three more of the new passenger coaches arrived here yesterday morning and the first new baggage car is on the way up.

      New and improved patterns of...
    • Don't like it at all

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company
    • Source: The Mining Journal
      Marquette, Mi.
      January 5, 1889

      Don't Like it at All.

      The duties of Mr. Edw. V. Sedgwick, superintendent of motive power and machinery on the D., S. S. & A., have brought him into contract [*contact]...
    • C Ludington Shaft of Chapin Mine

    • Mines and mineral resources
    • Photograph of the C. Ludington Shaft, facing east, shows the shaft housing which rose 114 feet above the collar of Iron Mountain's Chapin Mine. The chutes to the left allowed ore cars, like those pictured, to be loaded directly, as the ore came up...
    • First cables

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • The first cables are heading across the straits. The cable unrolls from the reels as the tug pushes the barge across. These catwalk support cables will be pulled out of the water and hoisted to the top of the towers where they will be adjusted to...
    • Information

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This sign was setup in a low just east of the bridge on the Mackinaw City side of the bridge. There was one just like it five miles across the water on the north side in a similar area.
    • Drawing

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Large bill-board sized rendering of the Mackinac Bridge. Shows foundations and all bridge-work. Signs like this were located near the bridge on the north and south shore so people viewing the progress of the bridge could get an understanding of...
    • Cable bent  cofferdam

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • The first section of the south cable bent pier was fabricated in Toledo, OH and towed to the site where it was placed within a corral and sunk to bedrock like the other piers. The round objects are tubes (digging wells) used by clamshell bucket...
    • 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.
    • Quarry

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Machinery, at the Drummond Island quarry, used for screening, sorting, grading, and conveying dolomite limestone like that used in the construction of the Mackinac Bridge
    • Equipment

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Specially built equipment like this derrick, being assembled on a barge at the railroad ferry dock, were brought in by train. The railroad ferry steamer ""Sainte Marie"" is in the background. Vessel was retired in 1961.
    • Tower going up

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • The towers were fitted together horizontally at Ambridge, PA., taken apart and shipped by rail to St. Ignace. The pieces were then placed on a barge and towed to the site and the creeper set them in place. This was like putting together a puzzle.
    • 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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