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H-Frame Construction Work Continues

Traffic Impact Map for Phase 2 of H-Frame Project

Construction work continues as City Light works to increase the electrical capacity and reliability to the Duwamish Valley with the H-Frame Replacement and Feeder Installation Project. City Light is replacing eight outdated H-Frame structures and cables that transmit electricity on high voltage lines across I-5 due to their age and increasing electricity demand. The project will improve system safety and increase electrical reliability for customers.

This phase of the project will close southbound Martin Luther King Jr Way S/SR900 at Boeing Access Road and the southbound I-5 on ramp south of Boeing Access Road as workers install a steel pole on the west side of I-5 (between I-5 and the railroads) south of Boeing Access Road.

On 9/13 (Saturday into Sunday), construction work will occur during the hours of 11 p.m. and 8 a.m. On 9/14 (Sunday into Monday) and 9/15 (Monday into Tuesday), construction work will occur during the hours of 10 p.m. and 5 a.m.

The traffic impacts and restrictions for this project are necessary for motorist and worker safety. Drivers are advised to carefully follow traffic detours and consider using alternate routes during construction.

Street Closures:

  • Southbound Martin Luther King Jr Way S/SR 900 at Boeing Access Road (follow detour)

On-Ramp Closures:

  • Boeing Access Road/Martin Luther King Jr Way S/Ryan Way S intersection to southbound I-5 (follow detour)

Detour Route:

  • Immediately south of Boeing Access Road motorists will be detoured to use the NB I-5 on-ramp
  • Exit NB I-5 at Swift/Albro (Exit 161)
  • Turn left onto northbound Swift Ave S
  • Turn left onto westbound S Albro Pl
  • Turn right onto northbound Stanley Ave S
  • Turn left onto westbound S Bailey St
  • Turn right onto the I-5 on ramps at Carleton Ave S (Michigan/Corson ramp)
  • Enter southbound I-5 and continue southbound on I-5 or take Exit 157 to southbound MLK/SR900

Project Map:

H-Frame Phase 2-01

Traffic Impact Map for Phase 2 of H-Frame Project

For more information about this and other City Light construction projects, please visit

 About Seattle City Light
Seattle City Light is the 10th largest public electric utility in the United States. It has some of the lowest cost customer rates of any urban utility, providing reliable, renewable and environmentally responsible power to nearly 1 million Seattle area residents. City Light has been greenhouse gas neutral since 2005, the first electric utility in the nation to achieve that distinction.