The old SR 520 west approach bridge, built in the early 1960s, served as a vital link between Seattle’s Montlake neighborhood and the SR 520 floating bridge. Built on hollow columns, the old bridge was aging and vulnerable to earthquakes. The new westbound bridge is designed to modern earthquake standards and includes a dedicated HOV/transit lane, providing a safer and more reliable connection. Pacific Pile and Marine was tasked with Design-build installation and removal of 1.3 miles long pile-supported work trestle, large-diameter drilled shaft installation, and marine heavy lift support.
