SR 520 Bridge Replacement and HOV Program


The eastbound lanes of SR 520 across Lake Washington will close for construction the weekend of Oct. 26-27. Learn more in our latest email update. 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

Join us for a 'Rest of the West' open house on Tuesday, Oct. 29

Please join us Tuesday, Oct. 29, at the Montlake Community Center for an open house on all four SR 520 “Rest of the West” projects in Seattle. Our team will be on hand to share the latest project designs and construction plans, address participants' questions, and capture their feedback. Learn more on our News and updates page.

Traffic notice: eastbound closure of SR 520 coming Oct. 26-27 weekend

Crews will close SR 520’s eastbound lanes across Lake Washington during the Oct. 26-27 weekend to shift all SR 520 traffic over Union Bay onto the westbound lanes. To make room for three to four years of Montlake Project construction, we are reconfiguring the westbound lanes to accommodate two lanes of traffic in each direction. Read more about this shift in our latest email update.

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, eventually, 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. 

Montlake Project Information Center now open -- another way to stay in touch 

SR 520 Montlake Project Information Center

We've opened a neighborhood drop-in office in Montlake to give the community another way to reach us regarding the SR 520 Montlake Project. Our project team is on hand to address your questions and comments about our work. Located at 2209 E. Lake Washington Blvd., the center's regular hours are Mondays and Wednesdays from noon to 6 p.m., Tuesdays and Thursdays from 8 a.m. to noon, and the third Saturday of each month from 9 a.m. to noon. 

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