Built in the 1960s, Seattle's old S.R. 520 floating bridge spanned Lake Washington to connect Seattle to its eastern suburbs and Microsoft's headquarters. It had become vulnerable to windstorms and earthquakes, had limited capacity and no access for pedestrians and bicyclists. The Washington State Department of Transportation (WSDOT) wanted to replace the bridge to improve safety and access for more vehicles and modes. Funding the $4.56 billion full-corridor project, however, was a challenge. WSDOT found a portion of the solution through toll financing.
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