Traffic Impacts for Final Phase of H-Frame System Upgrades

(Traffic Impact Map for Fri., Oct. 24- Sat., Oct 25)

Drivers using I-5 and State Route 900 near Boeing Field should plan for delays and prepare to use alternate routes as Seattle City Light crews work to replace overhead utilities that span the busy highways on Fri., Oct. 24 to Sat., Oct. 25. To complete this work, City Light’s traffic control contractor will close both directions of I-5 between SR 599 and Boeing Access Road, and MLK Way (SR 900) between S 129th St and Boeing Access Road. The highway closures will provide crews with the space they need to safely replace an overhead communication and lightning protection cable.

(Traffic Impact Map for Fri., Oct. 24- Sat., Oct 25)

Closure details

Fri., Oct. 24 to Sat., Oct. 25  

• Traffic closures on both directions of I-5 between SR 599 and Boeing Access Road and SR 900 (MLK Way). The first lane will close at 9 p.m.  All lanes will be closed by midnight and reopen by 6 a.m.
• Both directions of MLK Way (SR 900) will be closed between S 129th St and Boeing Access Road from 11 p.m. to 6 a.m. 
• The Interurban Avenue on-ramp to northbound I-5 and the Corson Avenue on-ramp to southbound I-5 will also be closed between 10 p.m. and 6 a.m.    

 Signed detour routes will be provided. Drivers are advised to carefully follow traffic detour routes and consider using alternate routes during construction.

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 This is the final phase of construction to replace eight outdated H-Frame structures and cables that transmit electricity on high voltage lines across I-5 due to their age and increasing electricity demand.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. For more information about this project and other City Light construction projects, please visit http://www.seattle.gov/light/aboutus/construction/.

MLK/SR900 Detour Routes:

Northbound:

• Turn left onto westbound S 129^thSt
• Proceed northwest on 50th Pl S
• Turn west onto S 124^th St
• Turn left onto southbound 42^ndAve S
• Turn right onto northboundInterurban Ave S
• Continue northbound on 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 115^thSt
• Proceed southbound on 42^ndAve S
• Turn left onto eastbound S 124^thSt
• Turn right onto southeast bound 50^thPl S
• Proceed east on S 129^th 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