Puget Sound road closures to snarl I-5, I-405, SR 520 and SR 99 through Monday

Key Points:

• Major construction closures and lane reductions will impact travel across the Puget Sound region from Friday through Monday, affecting Interstates 5 and 405, and state routes 520 and 99, leading to expected congestion and longer travel times.
• The I-5 express lanes through Seattle will be fully closed from Friday night to Monday morning for drainage improvements under the Ship Canal Bridge, with northbound mainline I-5 reduced to two lanes, creating a significant traffic bottleneck.
• Eastbound SR 520 between I-5 and Montlake Boulevard will close over the weekend for bridge preparation work, forcing drivers to seek alternate routes amid limited crossing options between Seattle and the eastside.
• Southbound I-405 in Tukwila will have lane closures and an HOV ramp closure affecting airport access, while Kirkland will see full ramp closures and road shutdowns on Northeast 85th Street for paving projects.
• Additional maintenance includes an overnight closure of the SR 99 Tunnel Friday night and lane reductions on the Aurora Bridge during Saturday and Sunday mornings.