City Light System Reliability Work Will Impact Traffic on I-5

Seattle City Light is enhancing the reliability of its electrical system by replacing two transmission line poles on the east and west sides of Interstate 5 at NE 60th Street. The work requires transferring the existing transmission line onto the new poles.

The two-day project is planned for Thursday, Aug. 27 and Friday, Aug. 28, from 1 a.m. to 4 a.m. Intermittent rolling slowdowns in both directions on I-5 between Northgate Way and State Route 520 are necessary for motorist and worker safety. Traffic will be escorted through the construction zone. See map on page 2. A maximum of four rolling slowdowns are necessary with each lasting from 20 to 25 minutes. All on-ramp traffic from Northgate Way through State Route 520 will be held and will merge with the next rolling slowdown. The I-5 Express lanes will be closed.

Drivers are advised to carefully abide by traffic restrictions and consider using alternate routes during construction. Normal traffic flow will follow once the transfer of wire is complete.

For more information about this project 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.