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In page Hood Canal Bridge:

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The design and planning process for the Hood Canal Bridge took nearly a decade amid criticism from some engineers throughout that time. Critics questioned the use of floating pontoons over salt water, especially at a location with high tide fluctuations and the concern that the funneling effect of the Hood Canal might magnify the intensity of winds and tides. The depth of the water, however, made construction of support columns for other bridge types prohibitively expensive.[1] The water depth below the pontoons ranges from 80 to 340 feet (25 to 105 m).[2] In its marine environment, the bridge is exposed to tidal swings of 16.5 feet (5 m).[3]