Information from WSDOT

It's March and that means it's time for a weekend-long inspection of the State Route 99 Alaskan Way Viaduct. Every March and October, the Washington State Department of Transportation closes SR 99 through Seattle so engineers can conduct a thorough inspection and make sure the viaduct remains safe for everyday driving.

On Saturday, March 4 and Sunday, March 5, the viaduct will close in both directions between South Spokane Street and the north end of the Battery Street Tunnel from 6 a.m. to 6 p.m.

On Sunday, March 5, the annual Hot Chocolate Run will also extend the closure north of the Battery Street Tunnel.

Drivers through Seattle should plan ahead and be prepared for additional congestion.

CLOSURE DETAILS

6 a.m. to 6 p.m. Saturday, March 4 and Sunday, March 5

Alaskan Way Viaduct closed for its scheduled inspection between South Spokane Street and the north end of the Battery Street Tunnel.
Sunday, March 5

The Hot Chocolate Run will close SR/99 Aurora Avenue North in both directions north of the Battery Street Tunnel.
Southbound SR 99/Aurora Avenue North will be closed to North 38th Street from 6:15 a.m. to 11:00 a.m.
The northbound lane closure will extend to North 45th Street from 6:15 a.m. to 11:15 a.m.
In addition, a Project Belltown walk through the Battery Street Tunnel could keep the northbound lanes of the Battery Street Tunnel closed as late as 1 p.m.