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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).

October 8

Notice of Saturday work at the Seward Park construction site

The construction team will be on site on Saturday, October 10th between 9:00 a.m. and 6:00 p.m. to work on the guide wall. Work will include digging, concrete pouring, and equipment maintenance activities. A Seattle Public Utilities (SPU) representative will be on site during this time.

Continued Saturday work in 57th Ave South near Martha Washington Park

The contractor will continue to work on Saturdays between 9:00 a.m. and 6:00 p.m. in order to complete construction activities as quickly as possible.

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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