Northbound 23rd Ave detour extending north to E Union St on Nov. 30

Central Area commuters and neighbors should plan ahead for traffic changes and delays


The Seattle Department of Transportation advises travelers of major detour changes on 23rd Avenue starting Nov. 30 as crews move north to continue constructing much needed safety and mobility improvements.

South Jackson Street to East Union Street

Northbound 23rd Avenue traffic is currently closed from South Jackson Street to East Cherry Street with a detour to Martin Luther King Jr Way. Crews will extend the detour from East Cherry Street to East Union Street on Nov. 30. This detour will likely stay in place through spring 2016, when 23rd Avenue is expected to re-open between South Jackson and East Cherry streets.

Beginning at 6:30 a.m. on Monday, Nov. 30, travelers can expect the following changes:

  • Northbound lanes on 23rd Avenue will be fully closed to traffic between South Jackson and East Union streets. Northbound traffic will be detoured to Martin Luther King Jr. Way at South Jackson Street and reconnect with 23rd Avenue at East Union Street.
  • Southbound travel on 23rd Avenue will be maintained at all times, though reduced to one lane (except at key intersections). Drivers should expect delays.
  • Access to some side streets from 23rd Avenue may be intermittently restricted.
  • Police officers will help manage traffic at the start of the extended detour.
  • Metro bus route detours and changes:
      • Northbound Route 48 will follow the extended detour on Martin Luther King Jr Way around the construction zone, returning to 23rd Avenue at East Union Street.
      • Southbound Route 48 will continue to operate along 23rd Avenue but may be delayed during construction due to traffic congestion.
      • On weekdays, Route 4 will continue to only operate as far south as 21st Avenue and East James Street. On weekends, Metro will continue to operate a revised Route 4 using a diesel bus that does not require a trolley wire.
      • Route 8 will continue to stay on Martin Luther King Jr Way in both directions.
      • For more information about Metro changes and detours during construction visit or call 206-553-3000.
East Union Street to East Madison Street

23rd Avenue remains open to two-way traffic between East Union and East Madison streets; however, traffic has been reduced to one lane in each direction since Oct. 26.

Pedestrian access will be maintained and all businesses will be open and accessible.

For more project information and to view detour maps, please visit