September 3, 2018 -- Labor Day
For a nod to "labor day", this is a memorial to iron workers who lost their lives during the building of the Mackinac Bridge (shown in distance behind the memorial). This memorial sits in Bridgeview Park in St. Ignace, Michigan on the shore of Straits of Mackinac.
Pronounced as “Mackinaw” the 26,372-foot-long (4.995 mi; 8.038 km) bridge bridge opened on November 1, 1957. This 5-mile bridge connects Michigan's Upper and Lower peninsulas and took 48 months to complete with over 3, 500 workers and $99,800,000 dollars. Also known as the "Big Mac" or the "Mighty Mac", the bridge is the fourth longest suspension bridge in the world, with a total span of approximately 5 miles.
The main bridge cables are made from 42,000 miles of wire and the towers stand 554 feet above the water and 210 feet below to the bedrock. The engineering of the Mackinac Bridge was designed to accommodate the high winds, temperature changes and constant changes of weight. In severe conditions the deck at center span can move up to 35 feet. Under more subtle conditions, the deck will move slowly in one direction based on the force and direction of the winds.
Some interesting trivia about this bridge:
* 89,000 blueprints and structural drawings were made
* 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
* 350 engineers
* 522 feet tall
* 1,024,500 tons in total weight
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