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North Henderson


North Henderson project area.

What & Why?

What's happening now?

Construction will be underway on the Seward Park site between early 2015 and mid 2017. The park remains open, but parking will be affected. View parking map (pdf).

November 16

Look ahead for construction activities at the Seward Park Construction Site

  • The construction team has completed pile installation and will finish installing the dewatering well system this week. This will help control ground water during excavation.
  • In the next several weeks, the contractor will begin to excavate soil where the new, buried CSO storage tank will be constructed. Excavation and truck trips to haul away soils will create noise, dirt, and vibrations. Excavation work is expected to continue until spring 2016.
  • In order to complete work efficiently, work hours are expected to remain 7:00 a.m. to 8:00 p.m. on weekdays. Certain activities will require the construction team to work longer hours during weekdays, or on Saturdays. Seattle Public Utilities (SPU) will continue to provide listerv notices when longer work hours, or work on weekends, are needed.
  • During excavation, nearby homes can expect increased truck traffic, noise, dirt, and vibrations. The team will continue to take measures to reduce construction noise and impacts. For example, the contractor will continue to use less-noisy vehicle backup alarms, when possible.

Holiday work schedule at the Seward Park Construction Site

Below is a summary of the expected holiday construction work schedule.

  • Thanksgiving: No work on November 26-27, 2015
  • Chanukah: The contractor expects to work between 7:00 a.m. and 4:00 p.m. from December 7-14, 2015
  • Christmas Day: No work on December 25, 2015
  • New Year’s Day: No work on January 1, 2016

Look ahead for construction activities in 57th Ave South near Martha Washington Park

In the next week, the construction team will complete electrical work and will conduct paving and landscaping activities.

The construction team has been working to complete activities as quickly as possible and expects to finish ahead of schedule. Construction activities at the site are expected to be complete by the end of December 2015, weather permitting. We thank you for your patience during construction.

Project goals and benefits

This project will reduce the frequency of sewage overflows into Lake Washington to no more than one per year per outfall (on average). SPU plans to complete two new underground storage facilities in North Henderson to store excess combined sewage and stormwater during major rain. The underground storage facilities are located offshore in the following locations:

  • Seward Park - view map of Basin 44 CSO improvements (pdf)
    The project includes additional piping, outfall replacement, with shoreline work and landscape improvements.
  • 57th Ave. S. near Martha Washington Park - view map of Basin 45 CSO improvements (pdf)
    The proposed underground facility for Basin 45 consists of a 16,000 gallon pipe and piping improvements.


Ask Us

Alan Lord, PE, Project Manager
(206) 233-1565

Please specify the project site with your comments:

  • Seward Park (Basin 44) or
  • 57th Ave. S. right-of-way (Basin 45)

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