#TBT “Shift Change” – Mackinac Bridge construction, 1956

Shift Change at Mackinac Bridge

“Shift Change” – Mackinac Bridge construction, 1956, photo by otisourcat

What’s your commute looking like today? Mightymac.org has a great account of building the Mackinac Bridge, a process that began on May 7, 1954 and was completed November 1, 1957. It begins:

Construction of the Mackinac Bridge began with the construction of the pillars. Caissons were constructed, floated into position and sunk to provide the footings for the two immense towers which would suspend the center span of the bridge. Once the caissons were in place, creeper derricks were added, which raised materials to erect the towers and continued to climb higher.

The Mackinac Bridge roadway truss sections were assembled in sections and floated into position to be raised into place.

Constructing the Mackinac Bridge actually went on into 1958 and took 48 months, 3,500 workers, 895,000 blueprints & structural drawings, 71,300 tons of structural steel, 931,000 tons of concrete, 42,000 miles of cable wire, 4,851,700 steel rivets, 1,016,600 steel bolts and 99,800,000 dollars. There were 350 engineers and another 7,500 men & women worked at quarries, shops, mills and other locations.

When completed, the Mackinac Bridge was the longest suspension bridge in the world and it is currently the longest suspension bridge in North & South America and the third longest suspension bridge in the world.

Read on for lots more including excellent photos of the process and also see these photos of construction of the Mackinac Bridge from the Mackinac Bridge Authority.

otisourcat writes: This is a color slide, but the aged Ektachrome color is so wonky, that the image is much clearer in B&W. View the photo bigger and see more Mackinac shots right here.

There’s lots more Mackinac Bridge photos & info and lots more Throw Back Thursdays on Michigan in Pictures.

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