information from WSDOT

Crews will coordinate staggered lane closures to complete important work on State Route 99/Aurora Avenue North starting Friday, May 8, in part to help Mariners fans get to and from Safeco Field this weekend.

The Washington State Department of Transportation will close all southbound lanes of SR 99/Aurora Avenue North between the Battery Street Tunnel and Valley Street from 10 p.m. Friday, May 8, until 5 a.m. Sunday, May 10. To help with traffic flow following the Mariners game that night, the northbound lanes will not close until 11 p.m.

On Saturday, May 9, crews will temporarily reopen the southbound lanes between the Battery Street Tunnel and Valley Street at 3 p.m. and the northbound lanes at 8:30 p.m. Crews will close all lanes again at either 10:30 p.m. or two hours after the end of the Mariners game, whichever is later.

These lane closures are necessary for two reasons: Seattle City Light crews must remove electrical lines and poles for the Seattle Department of Transportation’s Mercer West Project, while crews working for WSDOT need to connect a new water main under SR 99/Aurora Avenue North near Harrison Street. This work is essential for continued construction of the on- and off-ramp connections for the SR 99 tunnel’s north portal.

Southbound lanes of SR 99 between south end of Battery Street Tunnel and Valley Street
Closed from 10 p.m. Friday, May 8, to 5 a.m. Sunday, May 10.
At least one lane will temporarily reopen 3–10:30 p.m. Saturday, May 9.

Northbound lanes of SR 99 between south end of Battery Street Tunnel and Valley Street
Closed from 11 p.m. Friday, May 8, to 5 a.m. Sunday, May 10.
Both lanes will temporarily reopen 8:30–10:30 p.m. Saturday, May 9.