Mercer Island Station head house construction continues

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As the summer construction season draws to a close, significant progress has been made at the Mercer Island station. For the last few months, crews have erected structural steel for both the east and west head houses. Recently, the last pieces of structural steel were installed for the west head house at 77th Avenue Southeast as the existing path and landscape have been removed to prepare for plaza construction. Steel for the east head house at 80th Avenue Southeast is nearing completion as well. The photos below give you a glimpse of recent construction progress.

West head house at 77th Avenue Southeast.

Steel installation has been completed at the west head house at 77th Avenue Southeast. Crews have begun painting the steel and will begin installing stairs, escalator, steel decking and glass walls in the coming months.

Area adjacent to the 77th Avenue Southeast entrance.

The area adjacent to the 77th Avenue Southeast entrance has been cleared to prepare for the new plaza and landscaping.

Structural steel installation at the 80th Avenue Southeast head house.

Structural steel installation at the 80th Avenue Southeast head house is nearing completion.

Supports and wooden form work for the stairs and escalator in the 77th Southeast head house.

In this photo, you can see the supports and wooden form work for the stairs and escalator in the 77th Southeast head house.

Looking ahead

This falls, crews will continue work at the station and will begin preparing to install rail. In the coming months, crews plan to:

  • Excavate and install the station platform.
  • Install utilities, concrete and landscaping for the 77th Avenue Southeast entrance plaza.
  • Complete installing steel for the 80th Avenue Southeast head house and pour the final sound walls.
  • Receive ballast for track, weld additional track and begin installation this winter.