Seattle Public Utilities Mami Hara, General Manager/CEO

North Henderson

  • North Henderson Project Site Mid July Aerial photo of North Henderson Combined Sewer Overflow Reduction project site July 15, 2016.
  • North Henderson Basin 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).

December 9

Construction activities at the Seward Park site:

The majority of work continues to be inside the storage tank – including mechanical and electrical installations. Shoreline planting is ongoing and will be completed by the end of 2016.

This Saturday, Dec. 10, the contractor will be on site to prepare for the upcoming installation of permanent power to the site. Work hours are expected to be 9 a.m. to 5:30 p.m. The contractor will not work on Monday, Dec. 26, or Monday, Jan. 2, in observance of winter holidays.

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 in the following locations:


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)

Sign up for email updates.

For interpretation services please
call (206) 233-1565.

Para servicios de interpretación por favor llame al (206) 233-1565.

Về dịch vụ phiên dịch xin gọi (206) 233-1565.

Hadii aad u baahantahay turjubaan, fadlan inaga soo wac telefoonkan (206) 233-1565.

如需要口譯服務,請撥電話號碼 (206) 233-1565.