Construction to Impact Traffic on I-5

City Light is working to increase the electrical capacity and reliability to the Duwamish Valley with the H-Frame Replacement and Feeder Installation Project. This project will impact traffic on I-5 with intermittent ramp closures, lane closures, rolling slowdowns and traffic detours and surface street closures between the West Seattle Bridge and S 188th St as workers remove transmission cable currently spanning across the highway.

The construction work will occur during the hours of 9 p.m. to 5 a.m. on Sept. 7 (Sunday night into Monday morning) and Sept. 8 (Monday night into Tuesday morning).

City Light is replacing eight outdated H-Frame structures and cables that transmit electricity on high voltage lines across I-5 due to their age and increasing electricity demand.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.

The traffic impacts and restrictions for this project are necessary for motorist and worker safety. Drivers are advised to carefully obey the direction of the on-site uniformed law enforcement Officers, follow traffic detours and consider using alternate routes during construction.

Several I-5 north- and south-bound on-ramps within the traffic impact area will be closed intermittently during hours of construction as well as surface street, exit and I-5 lane closures. Uniformed law enforcement officers will control traffic flow onto the interstate both Northbound and Southbound, and within the affected area.

Traffic Advisory Map for 9/7 and 9/8

Lane Closures

  • Traffic will be reduced to one lane on SB I-5 between the West Seattle Bridge and S 188th St
  • Traffic will be reduced to three lanes on NB I-5 between the West Seattle Bridge and S 188th St

Intermittently closed on-ramps:

  • S Columbian Way to I-5 SB
  • West Seattle Bridge to I-5 SB
  • Carlton Ave to I-5 SB
  • Interurban Ave to I-5 NB
  • Southcenter to I-5 NB
  • I-405 Carpool to I-5 NB
  • I-405 to I-5 NB
  • S 188th St to I-5 NB

Street Closures:

  • Southbound Martin Luther King Jr Way S/SR 900 at Boeing Access Road (follow detour)
  • Northbound Martin Luther King Jr Way S at S 129th St (follow detour)

On-Ramp Closures:

  • Boeing Access Road/Martin Luther King Jr Way S/Ryan Way S intersection to I-5 SB
  • Northbound Martin Luther King Jr Way S to I-5 NB

Exit Closures:

  • Northbound I-5 Exit 157 (to Martin Luther King Jr Way S/SR 900)
  • Southbound I-5 Exit 157 (to Martin Luther King Jr Way S/SR 900)
  • Northbound I-5 Exit 158 (to Boeing Access Road)

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.

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City Light Addresses Strategic Plan Updates on KUNS-TV (Univision) Sat., March 29 at 6 p.m.

Univision hosts Teresa Gonzalez (left) Jaime Méndez (middle) welcomed City Light’s General Manager and CEO Jorge Carrasco (right) to a TV town hall to talk about the Strategic Plan Update.

Tune in Saturday, March 29, at 6 p.m. to KUNS-TV (Univision) and learn about Seattle City Light’s Strategic Plan Update. Jorge Carrasco, City Light’s general manager and CEO, served as a special guest joining a “Community Conversation” for 30 minutes entirely in Spanish. Community involvement is a founding element of City Light’s Strategic Plan. Carrasco leads by example by reaching out to our Spanish-speaking customers to provide them with important information about our programs and goals for the future.

The Strategic Plan is a blueprint for making informed decisions to meet customers’ current and future needs and the Strategic Plan update is an opportunity to gather further community input, reflect current conditions and incorporate necessary adjustments.

City Light proudly exceeded expectations in the second year of its six-year Strategic Plan and ambitiously raises the bar for years to come. By 2018, City Light’s goal is to reduce baseline costs by an ongoing $18 million per year, aggressively improve its safety record, expand community engagement and environmental leadership, and strengthen our ability to meet customer’s electricity needs.

“Most importantly, the Strategic Plan is about fulfilling our commitment to transparency and accountability.” said Carrasco. “This blueprint outlines our path forward and is also our report card to the community on how we are doing.”

Stay informed and learn more this Saturday on KUNS-TV (Channel 51) and read about our Strategic Plan Update.