On the Move Blog Department of Transportation

On The Move

Advisories from the Seattle Department of Transportation

Mercer Corridor Project: Northbound 9th Ave N closed
April 2; Westlake Ave N full closure begins April 3

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The Seattle Department of Transportation (SDOT) announces upcoming road closures and detours necessary for construction on Westlake Avenue N, as part of the east phase of the Mercer Corridor Project:

9th Avenue N closed to northbound traffic the evening of Tuesday, April 2

In preparation for closing Westlake Avenue N on April 3, 9th Avenue N will be closed to northbound traffic north of Mercer Street the evening of April 2, from 8 p.m. to approximately 6 a.m. the following morning, for rechannelization of the roadway.

During this closure, all northbound 9th Avenue N traffic will be detoured onto eastbound Mercer Street and northbound on Westlake Avenue N. One southbound lane on 9th Avenue N will be maintained as crews complete the work.

Westlake Avenue N fully closed to traffic for Stage 4 construction beginning Wednesday, April 3

Westlake Avenue N will be fully closed to through traffic between Mercer and Aloha streets beginning the morning of April 3, as crews begin underground utility installations and roadway demolition and restoration.

  • Overnight on Tuesday, April 2, crews will complete the rechannelization of 9th Avenue N to allow for two northbound lanes and one southbound lane between Broad Street and 8th Avenue N.
  • Northbound traffic on Westlake Avenue N will be detoured onto Mercer Street and then to 9th Avenue N to continue north.
  • For the first few days as traffic flow adjusts, uniformed police officers will be positioned at key intersections to facilitate traffic flow during peak travel times:
    • 9th Avenue N and Mercer Street
    • Westlake Avenue N and Mercer Street
    • Local access to Westlake Avenue N businesses between Mercer and Valley streets will be maintained. No through travel onto Valley Street will be permitted.
    • This configuration will be in place for approximately four months while crews complete utility improvements and rebuild the roadway on Westlake Avenue N.

Please note this work is dependent on weather and subject to cancelation.

Detour information available for Stage 4 construction

A detour maps illustrating restrictions on Westlake Avenue N is available online for vehicles at: http://www.seattle.gov/transportation/mercercorridor.htm.