I-405

Plan for full directional, lane and ramp closures in the Alderwood area

LYNNWOOD – Local residents, commuters and businesses in the Lynnwood and Alderwood area will see overnight grinding and paving work starting on State Route 525 as early as April.

Weekend closures part of Puget Sound’s high-impact construction in 2026

BOTHELL – A visible shift is about to take place at the Interstate 405/State Route 522 Interchange in Bothell. Beginning Feb. 20, crews will start removing large flyover ramps that once carried northbound I-405 traffic to SR 522.

UPDATE: Oct. 31, 2025 - The northbound I-405 overnight lane reductions scheduled to begin at 11 p.m. Friday, Oct. 31, is canceled due to weather. The work will be rescheduled to a later date.

UPDATE: The series of westbound SR 18 lane, ramp and directional closures has been postponed and will be rescheduled at a later date. The scheduled work on the SR 99 First Avenue Bridge has also been canceled. The information has been removed in the news release below.

Update: Oct. 10, 2024 - I-5 lane closures in Seattle will now include northbound lanes between mid-Boeing Field and the West Seattle Bridge. The updated information is reflected in the release below.

Update: Oct. 9, 2024 - The hours for the I-405 overnight lane reductions and ramp closures have changed. Note the lane closures will occur 8 p.m. Friday, Oct. 11 to 8 a.m. Saturday, Oct. 12. Ramps will be closed from 11 p.m. Friday to 8 a.m. Saturday. This updated information is reflected in the release below.

Closure runs from late Friday, July 12, to early Monday, July 15 

RENTON – Summer is here and so is the summer construction season, including a full closure of northbound and southbound Interstate 405 in Renton starting at 11 p.m., Friday, July 12, to 4 a.m., Monday, July 15.

KIRKLAND – Relief is coming for drivers who regularly experience delays accessing Interstate 405 in Kirkland’s Totem Lake area.

Weather permitting, crews working for the Washington State Department of Transportation will open the new Northeast 132nd Street on-ramp to northbound I-405 and southbound I-405 off-ramp to Northeast 132nd Street on Monday, April 29.

Evening work planned at different sites from March through June

SHORELINE – A project to update and improve the safety of 24 guardrails and barriers across King, Snohomish and Whatcom counties begins mid-March, adding energy-absorbing features to reduce the impacts of crashes.