Drivers should plan ahead for closures on State Route 99/Aurora Avenue North between the south end of the Battery Street Tunnel and Valley Street Friday through Sunday morning.

However, WSDOT is timing the closures to help Mariners fans get to and from the game Saturday.  Work wraps up and all lanes reopen by 5 a.m. Sunday morning.

During the closures, crews will connect a new water main under the highway near Harrison Street – a critical step toward building the on- and off-ramp connections for the SR 99 tunnel’s future north portal. Seattle City Light crews will also take advantage of the closure to remove overhead power lines.

The Alaskan Way Viaduct will remain open during this time.

Closure Details:

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 southbound lane temporarily reopens 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 temporarily reopen 8:30–10:30 p.m. Saturday, May 9.