Today in History: Nov. 7
The first Tacoma Narrows Bridge collapsed on this date in 1940. The bridge was opened to traffic in July of that year, and it was the third-longest suspension bridge in the world up until the day it collapsed, but it moved vertically in the wind, sometimes violently so, sometimes like a piece of clothing hung out to dry. (The bridge is seen bending, twisting in the photo at top.)
The bridge was built too narrow and constructed with shallow girders, which is why it waved in the breeze. Thus, even while it was under construction, the workers who were building it nicknamed it “Galloping Gertie” for its lack of stability. Engineers at the University of Washington were hired to find a solution to the oscillations, and they completed their first studies on November 2, 1940.
Read More

