SEATTLE - State Route 520 drivers should plan ahead for five closures of the floating bridge and highway, one direction at a time, during August and September.
During the closures, construction crews will tackle a variety of work throughout the corridor, from pouring concrete column foundations for the new west end bridge to shifting traffic onto new highway lanes near Bellevue, according to WSDOT spokesman Andrew Richardson.
The westbound direction of 520 between 92nd Avenue Northeast and Montlake Boulevard will be closed during these times:
• 11 p.m. Thursday, Aug. 22 to 5 a.m. Friday, Aug. 23 (Note: A single lane will be closed from 9-11 p.m. and 5-6 a.m.)
• 11 p.m. Thursday, Aug. 29 to 5 a.m. Friday, Aug. 30 (Note: A single lane will be closed from 9-11 p.m. and 5-6 a.m.)
• 11 p.m. Friday, Sept. 6 to 5 p.m. Saturday, Sept. 7
• 9 p.m. Saturday, Sept. 14 to 9 a.m. Sunday, Sept. 15
The four westbound SR 520 closures mark the first major steps to build the interim structure that will join the new SR 520 floating bridge to the existing highway near the west high rise. Crews will park trucks on the existing highway to pump concrete into shafts in Lake Washington. When hardened, the concrete will form the bases of columns that will hold up the new highway lanes.
"Concrete delivery trucks and a huge pump will block both westbound lanes of the bridge so we need drivers to find another way across the lake," said Dave Becher, engineering manager for WSDOT's SR 520 West Connection Bridge Project.
The eastbound direction of 520 between Montlake Boulevard and Interstate 405 will be fully closed 11 p.m. Friday, Aug. 23 to 9 a.m. Saturday, Aug. 24.
All eastbound lanes will close overnight Aug. 23 between Montlake Boulevard and I-405 when SR 520 Eastside Transit and HOV Project crews move eastbound traffic onto new highway lanes between 92nd Avenue Northeast and 108th Avenue Northeast. This shift makes room to build new, wider westbound lanes.