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canvas prints tacoma canvas prints transportation canvas prints bridge canvas prints 1900s canvas prints 1940 canvas prints 1950 canvas prints black-and-white canvas prints bracing canvas prints bridge deck canvas prints collapse canvas prints dampened canvas prints diagram canvas prints diagrams canvas prints engineering canvas prints galloping gertie canvas prints

photographs tacoma photos transportation photos bridge photos 1900s photos 1940 photos 1950 photos black-and-white photos bracing photos bridge deck photos collapse photos dampened photos diagram photos diagrams photos engineering photos galloping gertie photos

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Tacoma Narrows bridges compared. Diagrams and text prepared by the Historic American Engineering Record (HAER) project in 1993 to document the differences between the two Tacoma Narrows bridges of 1940 and 1950. The 1940 bridge spanned 1810 metres across the Tacoma Narrows strait in Puget Sound, in the US state of Washington. It collapsed on 7 November 1940 (right) due to aeroelastic flutter in gale-force winds. The replacement 1950 design included extra bracing, space for wind to pass through, and dampers, to prevent a repeat of the collapse.