12th Avenue Northeast road closure: Low point sump pipe installation

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As early as Monday, May 8 through May 26, Sound Transit's contractor will begin work that will take place along 12th Avenue Northeast between Northeast 58th and Northeast 56th streets.

The contractor will be installing the pipe that will connect the tunnel's sump pump to the drainage system. In order to complete this work there will be several temporary and complete road closures. This work will happen in three phases:

Road closure

What to expect:

Phase 1: May 8 – 12, Install thrust block

  • Traffic impacts: 12th Avenue Northeast road closure (local access only) between Northeast 58th and Northeast 56th streets during work hours. Road will be opened at night to the current one lane configuration. Bicycle traffic will be temporarily rerouted to use the sidewalk during this work. Parking will be removed at/near the work area. Some driveways will blocked during the work hours (you will be contacted directly if you are affected).
  • Construction activities: Crews will first excavate the ground in the work area, build the formwork for the thrust block and pour the concrete. There will be excavating, forming and pouring concrete.
  • Work hours: Monday - Friday, 7:30 a.m. to 5 p.m.

Phase 2: May 15 – 21 includes the weekend – Install vertical pipe

  • Traffic impacts: 24/7 road closure of 12th Avenue Northeast between Northeast 58th and Northeast 56th streets. Bicycle traffic will be temporarily rerouted to use the sidewalk during this work. Parking will be removed at/near the work area. Some driveways will blocked during the work hours (you will be contacted directly if you are affected).
  • Construction activities: Crane delivery and use of the crane in the work area to install the vertical pipe. This work will also include welding.
  • Work hours: Monday - Friday - 7:30 a.m. to 5 p.m.
  • Road will be closed 24/7 during this timeframe including the weekend of May 20 - 21.

Phase 3: May 22 – 26, Install service connects of the surface main*

  • Traffic impacts: 24/7 road closure of 12th Avenue Northeast between Northeast 58th and Northeast 56th streets during work hours. Bicycle traffic will be temporarily rerouted to use the sidewalk during this work. Parking will be removed at/near the work area. Some driveways will blocked during the work hours (you will be contacted directly if you are affected).
  • Construction impacts: Crews will excavate, trench, install pipe then back fill. Noise and vibrations due to the compacting of the soil will occur.
  • Work hours: Monday – Friday, 7:30 a.m. to 5 p.m.

*There is a possibility that other work will occur soon after this work is completed. We will provide an update as we get closer to the end of the work.

Restoration: Permanent restoration will be carried out to the Seattle Department of Transportation standards. Current expectations for the permanent restoration is for spring/summer of 2017.