Traffic & Transportation in Mercer Island
Mercer Island sits on I-90 between Seattle and Bellevue, connected by two floating bridges -- and, as of March 2026, hosts its own Sound Transit 2 Line station along the world's first light rail track ever installed on a floating bridge.
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Learn moreI-90 and two floating bridges: a real, unique connection pattern
Mercer Island connects to Seattle and Bellevue via I-90's two parallel floating bridges: the Lacey V. Murrow Memorial Bridge (westbound general-purpose traffic) and the Homer M. Hadley Memorial Bridge (which now also carries the 2 Line light rail track, a real, unusual engineering distinction as the world's first light rail on a floating bridge).
A real, current, major transit upgrade
The Mercer Island light rail station opened March 28, 2026, giving residents direct rail access both west to Seattle (and north to Lynnwood) and east to Bellevue and Redmond -- a genuinely dual-direction commute advantage unique among the five markets in this batch.
Sea-Tac International Airport access
Sea-Tac International Airport sits a real, practical drive from Mercer Island via I-90 and I-405/I-5 -- confirm current specific drive times given genuine regional traffic variability.
A genuinely walkable Town Center near the light rail station
Mercer Island's small Town Center commercial core sits near the new light rail station, offering a real, if modest, walkable amenity cluster for residents and commuters alike.
Key takeaways
- Mercer Island connects via I-90's two floating bridges -- one of which now carries the world's first light-rail-on-a-floating-bridge track.
- The March 2026 light rail station gives residents direct, dual-direction rail access to both Seattle and Bellevue/Redmond.
- Sea-Tac International Airport is a real, practical drive via I-90 and I-405/I-5.
- A genuinely walkable Town Center sits near the new light rail station.
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