• Project

SR 520 West Approach Bridge North Project

Project overview

The West Approach Bridge North Project extended SR 520’s three westbound lanes, including a transit/HOV lane, from the new floating bridge to Seattle’s Montlake neighborhood. It also expanded the new SR 520 Trail across Lake Washington to Seattle.

Construction began in September 2014 and finished in December 2017.
Project status
$264 million

What to expect

To make room to construct a parallel eastbound bridge, we've temporarily shifted all traffic over Union Bay onto the north bridge, with two lanes and a 40-mph speed limit in both directions. This configuration will last until Montlake Project construction finishes in 2023-2024. At that time, the north bridge will return to a three-lane, westbound-only bridge.

When the new eastbound bridge is complete, travelers will have three lanes in each direction of SR 520 between Montlake Boulevard in Seattle and 108th Avenue Northeast in Bellevue, including dedicated HOV/transit lanes and full shoulders. Pedestrians and cyclists can already use the new SR 520 Trail to cross Lake Washington.

Area map of the SR 520 West Approach Bridge North Project