Construction overview

The SR 520 Bridge Replacement and HOV Program is reconstructing SR 520 in phases, primarily working from east to west.

The next phase of corridor improvements, the Montlake Project, started major construction in summer 2019 in Seattle’s Montlake neighborhood. You can learn more about later phases of SR 520 construction in Seattle on our Rest of the West webpage.

We designed our Construction Corner webpages to make it easier for the public to learn about any SR 520 construction that's underway or scheduled in the weeks ahead, whether it involves highway closures, detours, nighttime work, or other community effects. The Construction Corner also describes our responsibilities and protocols for limiting the community effects of our construction.