Parts of Aurora Avenue North and eastbound Mercer Street will be closed to traffic from 3 a.m. Saturday until 5 a.m. Monday.

Aurora Avenue North will be closed between Valley Street and the south end of the Battery Street Tunnel. Here’s a map of closures and suggested detour routes.

Mercer Street will be closed between Fifth Avenue North and Dexter Avenue North. Traffic heading east toward Interstate 5 from Queen Anne will be detoured to eastbound Broad Street and reconnect to Mercer Street at Ninth Avenue North to continue toward the Mercer Street I-5 ramps.

The sidewalk on Mercer Street will also be closed for the same stretch. Pedestrians will be detoured to Broad Street.

Broad Street and the I-5 ramps at Mercer Street will remain open during the weekend work.

Travelers can expect significant traffic and delays and should plan ahead and use alternate routes, according to Seattle Department of Transportation. The closures are due to demolition of the Aurora Avenue North bridge over Mercer Street.