Tacoma Narrows Bridge Tacoma, Washington Proven engineering knowledge and state-of-the-art technology provide bridge sure footing in earthquake-prone region • Seismic know-how delivers strong, economical solution • Updated suspension bridge design integrates safety • Design allows for additional bridge deck later HNTB provided design, engineering and construction quality assurance to ensure the newest half of the Tacoma Narrows Bridge withstands strong earthquakes. The longest suspension spans in the world, the twin bridges carry traffic between Seattle-Tacoma and the Olympic Peninsula over a 4,600-foot Puget Sound channel, improving driver safety and relieving traffic congestion. HNTB’s seismic team proposed and, in 10 days, delivered a design to use massive, deep-water gravity c

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