Both directions of I-405 in Bothell to close for ramp removal, March 7-9 and March 13-16, 2026

SR 522 interchange concept map. Courtesy WSDOT

BOTHELL – Construction across the greater Puget Sound region continues to intensify as multiple projects move forward at the same time. As part of that sustained work, both directions of Interstate 405 in Bothell will fully close during the first two weekends of March so crews can remove the remaining portion of the previous northbound I-405 to State Route 522 ramp over I-405.

Closure details

March 7-9: 6pm Saturday, March 7, to 4am Monday, March 9, crews will close all lanes of northbound I-405 at the SR 522 Interchange and all lanes of southbound I-405 from SR 527 to SR 522 to remove ramp sections over I-405.

March 13-16: 9pm Friday, March 13, to 4am Monday, March 16, crews will close all lanes of northbound I-405 at the SR 522 Interchange and all lanes of southbound I-405 from SR 527 to SR 522. All lanes of southbound I-405 may reopen as early as 9am Sunday, March 15, depending on ramp removal progress.

Ramp closures

Ramp closures are required overnight to restripe the northbound I-405 detour route temporarily to two lanes to increase capacity and again to reset the lanes. Travelers can expect closures of the following ramps overnight:

• The northbound I-405 on-ramp to westbound SR 522
• The eastbound and westbound SR 522 on-ramps to northbound I-405.

During the southbound I-405 full closures the following ramps will also close:

• SR 527 on-ramps to southbound I-405.
• Northeast 195th Street on- and off-ramps (exit 24) to southbound I-405.

This work is part of the I-405/Brickyard to SR 527 Improvement Project, which expands and enhances 4.5 miles of I-405 through Bothell. Full closures of I-405 are necessary to keep drivers safe and protect the I-405 bridge deck below the ramp during its removal.

“We learned a lot during the removal of the first few sections of these ramps over SR 522,” said I-405/SR 167 Program Administrator Lisa Hodgson.

“Now we need to close I-405 to remove the remaining portions of ramp. Leveraging our lessons learned from the previous ramp sections, we are able to reduce the time we plan to fully close I-405 on both weekends. However, we still expect these closures to have significant impacts to regional travel."

Detour routes

Signed detour routes will be in place:

• Northbound I-405 nighttime detour: In place while crews restripe lanes for daytime detour and reset lanes before reopening to traffic Monday morning.
• Northbound I-405 daytime detour: Westbound SR 522 traffic will make a right turn at the traffic signal instead of using the merge ramp to help prioritize northbound I-405 traffic.
• Southbound I-405 detour.

Drivers are advised to slow down and pay attention through the detours. Uniformed police officers will help direct traffic.

Effect on traffic

Detour routes are limited and cannot carry normal I-405 freeway volumes. Travelers should expect 2- to 3-mile backups on I-405 during the full closures. A one-hour delay in both directions is the best-case scenario during peak travel times.