As part of construction to extend light rail from Seattle to the Eastside, crews will shut down a portion of westbound Interstate 90 on Tuesday night.

Sound Transit will close westbound I-90 between Bellevue Way Southeast and Interstate 405 to safely disassemble and move a crane across the freeway lanes. This crane, known as a traveler, has been lifting and positioning concrete segments, which are fastened together to form the future train bridge from Mercer Island into Bellevue.

Ramps will begin to close at 8 p.m. Tuesday with the full closure lasting from 11 p.m. to 5 a.m. Wednesday. Partial westbound freeway closures, with at least one lane available, are expected the next three nights.

Traffic Lab is a Seattle Times project that digs into the region’s thorny transportation issues, spotlights promising approaches to easing gridlock, and helps readers find the best ways to get around. It is funded with the help of community sponsors Alaska Airlines, Kemper Development Co., NHL Seattle, PEMCO Mutual Insurance Company and Seattle Children’s hospital. Seattle Times editors and reporters operate independently of our funders and maintain editorial control over Traffic Lab content.

This is the second night of planned closures.

Drivers will be detoured onto northbound I-405 to exit at Southeast Eighth Street, turn west on Eighth, then return to I-90 via 112th Avenue Southeast and Bellevue Way Southeast. Ramps from Bellevue Way Southeast to I-90 will remain open.

Trucks more than 10,000 pounds are required to travel farther on I-405, then use I-5 or other routes to reach Seattle, instead of local streets near Mercer Slough Nature Park.

Light-rail service between Seattle, Mercer Island, Bellevue and Overlake is scheduled to open in 2023.


Sound Transit encourages motorists to plan ahead and allow extra time to reach destinations. Weather or other unforeseen issues may affect dates and closure times.