Northbound I-405 Construction in Bellevue this weekend; find alternate routes to Kirkland


Bellevue Way, Richards Road, 124th Avenue NE and 116th Avenue NE are good alternatives for Summerfest visitors coming  from Bellevue

Round two of the northbound I-405 Bellevue construction closure is set for this weekend, Friday, Aug. 9 at 10 p.m. through Monday, Aug. 12 at 4 a.m. Drivers can avoid the worst congestion by traveling before 10 a.m. or after 6 p.m., or taking well-chosen parallel roads and detour routes.


“We reviewed data from the last closure and found that most people flocked to the 148th Avenue detour route,” said Jamie Holter, INRIX Traffic Analyst. “Bellevue Way, Richards Road, 124th Avenue NE and 116th Avenue NE were underused.”


INRIX recommends drivers check traffic conditions on all detour routes before heading into Bellevue. “The road less traveled really can make all the difference, especially getting into Bellevue,” said Holter.


The Washington State Department of Transportation will close all lanes of northbound I-405 from SE Eight Street to State Route 520 for concrete repair. The ramps from I-90 to northbound I-405 will also be closed. All local traffic will be detoured off northbound I-405 at SE Eighth Street.


By the numbers:

  • Congestion on northbound I-405 between I-90 and SE Eighth St. picked up at 8 a.m., peaked at 11 a.m. and 2 p.m. and didn’t let up until 7 p.m. Between 9 a.m. and 6 p.m. the backup stretched from SE Eighth St. to I-90.
  • Congestion on 148th Ave. NE picked up at 10 a.m., peaked at 1 p.m. with about 30 percent more congestion and tapered off around 4 p.m. The road was back to typical Saturday traffic by 6 p.m.
  • Congestion on Bellevue Way picked up at 11 a.m., peaked at 1 p.m. and 3 p.m. and was back to normal by 6 p.m. The change from a typical day was very small indicating that it was not used by many drivers.
  • Congestion on 124th Ave. NE showed no change.
  • Saturday congestion was significantly worse than Sunday congestion.


“During the last closure, WSDOT closed SR 520 as well, so that certainly added to the traffic dynamic. But the data shows drivers can save time by checking all the alternate routes in advance,” said Holter.

Kirkland Summerfest, the city's largest festival of music and arts takes place in downtown Kirkland Aug 9, 10, 11. Learn more at