Part of State Route 99 in Seattle, including the Alaskan Way Viaduct, will be closed over five days next month as part of the viaduct replacement project.

WSDOT says the bridge over Broad Street and the street itself must be transformed to prepare for the future connection to the tunnel that will replace the viaduct, which includes on- and off-ramps to be built at Harrison and Republican streets.

The worst part of the closure begins at 10 p.m. Friday, Aug. 22. The entire stretch of SR 99 between the West Seattle Bridge and Valley Street will be shut down in both directions.

Aug. 22 is the same night the Seattle Seahawks host the Chicago Bears in a preseason game, which is likely to be a sellout. WSDOT says northbound SR 99 will stay open from S. Royal Brougham Way until midnight to accommodate traffic.

Most of SR 99 is scheduled to reopen at 5 a.m. that following Monday, Aug. 25. But, the closure will continue between the Battery Street Tunnel and Valley Street until 5 a.m. on Wednesday, Aug. 27. Northbound drivers will have to exit at Seneca Street or Western Avenue.

Other work that will be done during the closure includes utility work at Harrison Street, concrete panel replacement in SODO, expansion joint repairs on the viaduct near the Seneca Street off-ramp and removal of ivy from the viaduct in downtown Seattle.

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