Traffic crunch: Alaskan Way Viaduct closes for the weekend

SEATTLE -- Drivers plan ahead. State Route 99 through Seattle will close this weekend.

In SODO, contractor crews for WSDOT will unveil the permanent concrete shape of the South Atlantic Street overpass above SR 99 by removing temporary steel and timber beams that supported construction.

North of downtown, SDOT crews will install a sewer line under the road for the Mercer Corridor project and grind the pavement in the southbound lanes of the Battery Street Tunnel.

Northbound SR 99 will be closed between South Spokane Street and Valley Street from 10 p.m. Friday to 5 a.m. Monday. Southbound SR 99 will be closed from the north end of the Battery Street Tunnel to Spokane Street from 10 p.m. Friday to 5 a.m. Monday.

Southbound SR 99 will be reduced to one lane between Highland Drive and the north end of the Battery Street Tunnel from 10 p.m. Friday to 5 a.m. Monday.