• Project

SR 520 I-5 Express Lanes Connection Project

The Sept. 29 - Oct. 2 planned weekend closure of the southbound I-5 off-ramp to Mercer Street is postponed. A new date will be announced soon.

Project overview

The SR 520/I-5 Express Lanes Connection Project will create a dedicated reversible transit and carpool connection between SR 520 and the I-5 Express Lanes, along with a reversible transit/carpool ramp at the I-5/Mercer Street interchange.

August 2021 - 2024
Project status
$68 million
Project hotline

What to expect

The southbound I-5 & I-5 express lanes off-ramps to Mercer Street in Seattle will close for four consecutive weekends, listed below, beginning at 10 p.m. Friday until 5 a.m. Monday.

Sept. 8-11,

Sept. 15-18,

Sept. 22-25 and,

Sept. 29 - Oct. 2

Any schedule changes to upcoming closures will be communicated here and on the SR 520 Construction Corner webpage.

The lane reduction on the westbound State Route 520 ramp to southbound I-5 will extend until March 2024. The lane reduction on the express lanes will continue through October 2023. More details on these extensions are available in the news release.

Area map of SR 520/I-5 Express Lanes Connection Project in Seattle.