Planning for a quieter new Washington State Route 520

In the scenic Pacific-Northwest corner of the United States, between the rugged shores of the Pacific Ocean and the towering Cascade Mountains, lies State Route 520 (SR 520) in Washington State. SR 520 is a vital transportation corridor connecting Seattle, the state's largest city, with its neighboring communities to the east. Each day, the highway enables over 150,000 vehicles to travel across Lake Washington over a series of structures, including the Evergreen Point Bridge, the world's longest floating bridge. As one of only two routes from Seattle across Lake Washington, SR 520 is extremely important for both local and regional traffic, including the tens of thousands of employees of Amazon.com, Boeing, and Microsoft and many other global corporations which contribute significantly to Washington State's economy.