SR 520 Bridge Replacement and HOV Program


For the most up-to-date information about SR 520 construction activities and planned road closures, check our SR 520 Construction Corner and its interactive construction map. You also can view Montlake Project construction photos taken daily, 'round the clock, by four mounted construction cameras.

Current News

SR 520 lane reduction in place to enable replacement of old eastbound lanes; temporary on-ramp opening soon

WSDOT contractor crews recently realigned SR 520 lanes in the Montlake area, reducing from six to four the number of travel lanes between Montlake Boulevard and the SR 520 floating bridge. This three- to four-year lane reduction is necessary to remove the old eastbound lanes over Union Bay and construct a stronger replacement structure. The graphic below shows how traffic now moves through the Montlake area. The graphic also shows where a temporary eastbound on-ramp will be opened by Dec. 19 as we permanently close the old eastbound on-ramp in the Arboretum. Read our latest blog to learn more about this important traffic shift.

map showing the location of a temporary eastbound SR 520 on-ramp in Montlake  

View a larger image. (pdf 9 mb)

Lights, camera … construction! View SR 520 work online and track its progress

SR 520 Montlake Project construction camera September 23, 2019

Want to follow our construction progress from home? Now you can since we’ve started taking selfies, robotically, of our Montlake Project construction!

Online photos from fixed-mount cameras show the worksite from four different viewpoints. New pictures are shot and posted every 10 minutes ‘round the clock. You can browse through photos from previous days, weeks or even months to see crews' progress. Two of the cameras offer time-lapse footage, while another feature (found in a rectangular box in the lower-right corner of the screen) lets you isolate a section of the work site and track its construction progress over time, while the rest of the image remains fixed in the site's current condition. 

Program overview

The SR 520 Bridge Replacement and HOV Program is enhancing public safety and mobility by replacing the highway's aging, vulnerable bridges and making significant transit and roadway improvements throughout the corridor. Built in stages, the construction program's completed and planned improvements extend from I-405 in Bellevue to I-5 in Seattle.

map of the SR 520 corridor's major projects

Click on the map above to visit our SR 520 Major Projects webpage.


Phone: 206-770-3500
Find SR 520 Program contact information: Contact Us


Eastside projectPontoon project