SEATTLE – City Light is working 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 City Light is replacing eight outdated H-Frame structures and cables that transmit electricity on high voltage lines across I-5 due to their age and increasing electricity demand.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.
During this phase of work crews will install 11 transmission, distribution and communications cables across I-5 and Martin Luther King Jr Way S (MLK)/SR900.
This phase of the project will close both directions of I-5 between SR599 and Boeing Access Road and both directions of MLK/SR900 between S 129th St and Boeing Access Road.
I-5 closure hours:
9/19 (Friday into Saturday) and 9/20 (Saturday into Sunday)
- Lane closures will begin at 9 p.m.
- Full closure will begin at 11:59 p.m.
- All lanes will be open at 6 a.m.
9/21 (Sunday into Monday)
- Lane closures will begin at 9 p.m.
- Full closure will begin at 11:59 p.m.
- All lanes will be open at 5 a.m.
MLK/SR900 closure hours:
- 9/19 (Friday into Saturday) and 9/20 (Saturday into Sunday): 11 p.m. and 6 a.m.
- 9/21 (Sunday into Monday): 11 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.
On Saturday night, 9/20, WSDOT Signals will keep the left 4 lanes of northbound I-5 closed from Boeing Access Road to I-90.
Project Area Map:
Traffic Impacts for H-Frame Phase 3
MLK/SR900 Detour Routes:
Northbound:
- Turn left onto westbound S 129thSt
- Proceed northwest on 50th Pl S
- Turn west onto S 124th St
- Turn right onto northbound 42nd Ave S
- Proceed westbound on S 115th St
- Turn right onto northbound E Marginal Way S
- Turn right onto eastbound Boeing Access Road
- Turn left onto northbound MLK/SR900
Southbound:
- Turn right onto westbound Boeing Access Road
- Turn left onto southbound E Marginal Way S
- Turn left onto eastbound S 115th St
- Proceed southbound on 42nd Ave S
- Turn left onto eastbound S 124thSt
- Turn right onto southeast bound 50th Pl S
- Proceed east on S 129th St
- Turn right onto southbound MLK/SR900
I-5 Detour Routes:
Northbound at Interurban
- Proceed northwest on Interurban
- Proceed northbound on E Marginal Way S at E Marginal Way S
- Turn right onto Boeing Access Road
- Enter NB I-5 from the Martin Luther King/Boeing Access Road/Ryan Way intersection
Northbound at Southcenter Blvd
- Proceed eastbound on Southcenter Blvd
- Turn left onto Interurban Ave S
- Proceed northbound on E Marginal Way S at E Marginal Way S
- Turn right onto Boeing Access Road
- Enter NB I-5 from the Martin Luther King/Boeing Access Road/Ryan Way intersection
Southbound
- Exit SB I-5 at Boeing Access Road (Exit 158) onto westbound Boeing Access Road
- Turn left onto southbound Pacific Hwy S
- Turn left onto southbound SR599
- Enter southbound I-5 from SR599
For more information about this and other City Light construction projects, please visit http://www.seattle.gov/light/aboutus/construction/.
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.