The State Route 520 Floating Bridge is a unique bridge located in Washington State, connecting Seattle to Medina. It spans Lake Washington and is notable for being the longest floating bridge in the world, measuring approximately 7,580 feet. The bridge was opened to traffic in 1963 and serves as a vital transportation route for commuters and travelers. Constructed using a series of concrete pontoons, the bridge floats on the lake's surface, allowing it to adapt to changing water levels. The State Route 520 project also includes improvements to surrounding roadways and transit options, enhancing overall accessibility in the region.