The 48-hour shutdown will last until 11:59 p.m. Sunday. Drivers can still go south through the Battery Street Tunnel but must immediately exit using the Western Avenue offramp.
The southbound lanes of the Alaskan Way Viaduct are closed this weekend so concrete can be poured for the future Highway 99 tunnel Sodo interchange.
The 48-hour shutdown is from 11:59 p.m. Friday until 11:59 p.m. Sunday. Drivers may still go south through the Battery Street Tunnel but must exit immediately at the Western Avenue offramp.
Meanwhile, previously announced repaving closures were rained out for both northbound I-5 from Sodo to Lake Union and westbound Highway 2 from Snohomish to Interstate 5 in Everett.
This fall the viaduct along Seattle’s waterfront will close permanently so that end ramps at both Sodo and South Lake Union can be attached to the 1.7-mile tunnel, which bypasses downtown Seattle.
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This weekend’s work is at South Atlantic Street. The new interchange will have ramps from the stadium area and a future waterfront Alaskan Way boulevard, which will be the main route for ferry traffic.
The Washington State Department of Transportation says it will issue a warning one month in advance before carrying out its “Realign 99” operation, when it will close Highway 99 through Seattle for three weeks.
After that, the four-lane tunnel will have its grand opening. The new northbound exit to Dearborn Street near the stadiums will require two more weeks of construction.