• Project

2023-24 Northwest Regional Pavement Repairs and Breakaway Cable Terminal

The southbound I-5 off-ramp to westbound South 188th Street will close from 10 p.m. to 5 a.m. nightly Monday, June 10, through Friday morning, June 14, for sidewalk and signal work. A short detour will be available, with more details on our Travel Center Map.

Project overview

A regional project beginning in March 2024 will update 24 guardrails and attenuators along Interstates 5, 90 and 405, US 2 and State Routes 522 and 527 in King, Snohomish and Whatcom counties. The breakaway cable terminals, or guardrail protective end caps, face oncoming traffic. This project also will replace impact attenuators, which act like a cushion protecting concrete barriers, at the James Street and Northeast 71st Street exits from southbound I-5 in Seattle.

In September 2023, a second regional project improved and preserved a five-mile stretch of SR 18 near the Tiger Mountain State Forest. The project sealed cracks between Issaquah-Hobart Road Southeast and just south of Raging River. After pausing during the winter, the project resumed in April and made pavement repairs on 27 ramps at 12 interchanges along I-405 in Tukwila, Kirkland and Bothell, SR 509 in SeaTac, and SR 99/SR 599 in Tukwila and Edmonds.

A second phase of the regional repair project began work in May 2024, and will continue pavement repairs, grinding down damaged sections of pavement and repairing those sections with hot mix asphalt. The project also will retrofit curb ramps to meet Americans with Disabilities Act requirements and upgrade signals. Work is scheduled on I-5 ramps in SeaTac and Tukwila, I-405 ramps in Tukwila and Kirkland and on SR 18 from Issaquah-Hobart Road to just south of Deep Creek.

Fall 2023 - Summer 2024
Project status
$5.7 million (combined)

What to expect

During ramp pavement repairs, expect nighttime ramp, lane and shoulder closures, with signed detours available where needed. Work on the curb ramps will require sidewalk closures, with pedestrian detours available. Work on SR 18 will require up to seven nights of directional closures in each direction between I-90 and Issaquah-Hobart Road, with a detour available. Freight traffic should detour using I-405 and I-90 during the SR 18 directional closures.

The Breakaway Cable Terminal Replacement project will require shoulder and some lane and ramp closures, with detours available around ramp closures.

The guardrail protective end cap along the Swift Avenue South on-ramp to northbound I-5 in Seattle was replaced on Monday, March 11.