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Upper Peninsula Regional Digitization Center

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    • 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...
    • Central High School

    • Cities and towns, School buildings, Courthouses
    • Stereoscopic photograph of the Central High School building (SW corner of Bingham and Portage). View is looking south from Portage, and the image was taken before the wing was added on the west side of the school. The building burned in 1926. The...
    • Railroad Bridge

    • Soo Locks (Mich.), Boats and boating
    • Photograph showing a portion of the railroad bridge at the Sault Rapids. View is to the northeast, with Ontario in the background. A moveable portion was added to the bridge as part of the construction of the third and fourth locks. It was a...
    • Central High School

    • Cities and towns ; School buildings ; Courthouses
    • Cyanotype, stereoscopic photograph from Portage Avenue looking south at Central High School and the Courthouse, showing part of the old Presybterian Church (just to the right of the corner of the school). Taken before wing was added to west side...
    • Anchor pier

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This photo shows the aggregate is above the surface of the surrounding water and the two inch reinforcing bar (rebar) is above the aggregate ready for the next course after grouting is completed below. The future superstructure will be added here...
    • Grouting

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Grout was pumped down the grout pipes to the bottom of the aggregate layer. As the grout raised through the voids between the aggregate it displaced the water that was above it. Before the grout ""set"" the pipes were pulled up to a prescribed...
    • Aerial view

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • A mobile crane is atop the framework at the center of the south anchor pier. As more structural steel is added it is then encased in concrete. When complete this will be a massive block of concrete and steel that will hold the cable ends for the...
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Construction of the first section of a tower caisson. Note the wedge shaped cutting edge. These sections were fabricated in Gary, Indiana and shipped to Rockport (Alpena), MI by barge where they were assembled by Wiltse Brothers Shipyard. This...
    • Cable bent pier cofferdam

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • The cofferdams used for the cable bent piers, built at St Ignace, were 75 feet high and 50 feet in diameter. They were sunk to bedrock (65 feet for pier No. 21, the north cable bent pier) sheet piling was added and excavation was done within.
    • Fearful wreck on DSS&A

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company
    • Source: The Alger County Republican
      Rock River, Alger County Mi.
      June 20, 1891 Saturday

      Fearful Wreck on The DSS&A at L'Anse

      A special from Marquette says: A frightful train wreck occurred Thursday on the L'Anse grade of the...
    • Duluth division towns

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company
    • Source: The Mining Journal, Marquette, Mi.
      Thursday, Feb. 13, 1892

      Duluth Division Towns

      Among the new towns that aspire to be manufacturing and commercial centers along the DSS&A, Ewen and Trout Creek are prominent. At Ewen...
    • South shore road

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company
    • Source: The Mining Journal, Marquette, Mi., December 11, 1886

      The South Shore Road

      The Duluth News gives this interesting history of the project to connect Duluth with Sault Ste. Marie by a railroad running along the south shore of...

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