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Upper Peninsula Regional Digitization Center

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  • All fields: Straights
(56 results)



Display: 20

    • Advertising

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Billboard signs such as this were erected on both sides of the straights so the public could have a better understanding of what was going on out there in the lake.
    • Advertising

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Billboard signs such as this were erected on both sides of the straights so the public could have a better understanding of what was going on out there in the lake.
    • Advertising

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Billboard signs such as this were erected on both sides of the straights so the public could have a better understanding of what was going on out there in the lake.
    • Aerial view

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This aerial view of the site looking northeast shows the foundations of piers 17 through 22. These were the piers that were the deepest and those which support the entire suspension part of the bridge structure. Note the causeway sticking out...
    • Aerial view

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This aerial view of the site looking northeast shows the foundations of piers 17 through 22. These were the piers that were the deepest and those which support the entire suspension part of the bridge structure. Note the causeway sticking out...
    • Aerial view

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Aerial view looking south with Mackinaw City in the upper left. This view shows the entire marine construction site, from the causeway at the bottom and all the piers in a line across the straights.
    • Aerial view of the straights

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This aerial view is looking to the Northeast. Mackinaw City at the lower right and St.Ignace upper middle. State of Michigan Automobile ferry ""Vacationland"" can be seen rounding the point as it heads south. At the bridge site, most of the...
    • Anchor pier

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This anchor pier ( pier No. 17 ) foundation is completed as they continue to work in the sough cable bent pier, No. 18 before winter sets in at the Straights of Mackinac
    • Cable anchor framework

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Cranes place one section of the steel framework for one of the cable anchor piers. The critical placement of the first section was guided by surveyors stationed on several of the seven survey towers located through the Mackinac Straights area.
    • Cable anchor pier

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • With sighting rods (white sticks) in place, cranes lower the framework for pier No. 17, the sough anchor pier, into exact position as surveyors give direction by radio from several of the seven surveying towers placed in the Mackinac Straights...
    • 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...
    • Causeway

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This 4200 foot long causeway which became a part the north end approaches to the bridge span was built in 1941 as a part of an attempt to bridge the Straights of Mackinac. During bridge construction it was used as a staging area and parking lot. ...
    • Corral

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Corrals for guiding caissons into position are loaded on barge ready for the trip from St. Ignace (at the north end of the bridge site) to the location in the straights were they will guide the caisson to its final resting place.
    • Corral

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • One of four corrals being unload from a barge. It then stood on the bottom of the Straights of Mackinac and was used to guide the pier caisson as it went into position. Surveyors guided this operation through triangulation from the seven survey...

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