This year’s busy summer season of roadwork in the Seattle metropolitan area starts Friday night with a weekend-long closure of all lanes on state Route 520 across Lake Washington.

Contractor crews working for the Washington State Department of Transportation will use the closure Friday, May 30, to Monday, June 2, to continue pouring concrete — up to 55 truckloads — for the roadway deck on the new West Connection Bridge.

This weekend’s closure is the first of four SR 520 closures planned in the next five weeks. The bridge will remain open the weekend of June 14 to accommodate drivers attending graduation ceremonies at the University of Washington.

 From Friday, May 30, to Monday, June 2:

•Crews will close all lanes of SR 520 from Montlake Boulevard to Interstate 405 at 11 p.m.

•To cross Lake Washington, use Interstate 90 or an alternate route around the lake.

•Crews will install tolling infrastructure and place more than 10,000 tons of asphalt for the Eastside Transit and HOV Project.

•All lanes are scheduled to reopen in time for the morning commute at 5 a.m. Monday.

From June 6 to 9, a trio of closures will take place the first full weekend in June, all scheduled to begin at 10 p.m. that Friday and conclude by 5 a.m. the following Monday:

•Both directions of SR 520 will close between Montlake Boulevard and I-405 for ongoing bridge work.

•The two right lanes of northbound Interstate 5 at the West Seattle Bridge will close to replace aging expansion joints. 

Additionally, on Saturday and Sunday only, up to two northbound lanes across the Ship Canal Bridge will closed from 3:30 to 11 a.m. and one lane through dusk for pavement repair and guardrail work.

•Southbound state Route 99 from Denny Way to South Spokane Street will close to shift southbound traffic onto a new route through the SR 99 tunnel project site.

Many other road construction projects to maintain, repair and preserve highway infrastructure get underway this summer on I-5, I-90 and SR 99:

•Beginning in July, more than 300 concrete panels will be replaced on I-5 between North 117th Street and state Route 104. The work will require overnight closures of multiple lanes and ramps.

•Concrete road panel replacement will require overnight closures of multiple lanes of SR 99 between Spokane Street and the Alaskan Way Viaduct from August until fall.