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In 1940, the Tacoma Narrows Bridge opened at a cost of $6.4 million; it collapsed into Puget Sound four months later in 40 mph winds

"Galloping Gertie" swayed from day one, but its fatal flaws taught engineers how to build safer bridges.

In 1940, the Tacoma Narrows Bridge opened after 19 months of construction at a cost of $6.4 million; it collapsed into Puget Sound four months later in 40 mph winds

The bridge opened on July 1, 1940, and had the third-longest suspension span in the entire world, according to the Washington ...