Long-Term Lane Closures on Denny Way Due to Electrical Substation Work

Construction at the future Denny Substation will begin to affect Denny Way on Aug. 28.

On Sunday, Aug. 28 crews will begin electrical duct bank excavation work on Denny Way. This project will require closures of both westbound lanes on Denny Way weekday and weekend nights. The westbound lanes closure is the first of three phases of work that will occur in Denny Way over the next three months. After the first phase, work will require nighttime eastbound lane closures from mid-September to mid-October and then 24/7 closures of one eastbound and one westbound lane from mid-October to mid-November for the third phase.

The specific closures for late August through mid-September (Phase 1) take place during the night and early morning to minimize impacts to the morning commute:

  • Weekdays: 11 p.m. to 5 a.m. – Both westbound lanes of Denny Way will be closed from Stewart Street to Minor Avenue N
  • Weekends: 11 p.m. to 7 a.m. – Both westbound lanes of Denny Way will be closed from Stewart Street to Minor Avenue N

During the Phase 1 closure, westbound traffic on Denny Way will be detoured southwest on Stewart Street to Boren Avenue, northwest on Boren Avenue to Fairview Avenue, then north on Fairview Avenue to Denny Way. The timing of the work is being coordinated with other projects on Stewart Street to limit the impact for commuters.

Project Background: As part of the Denny Substation Program, Seattle City Light is building a new substation (Denny Substation) and underground electrical distribution network (Denny Network) and designing a transmission line (Denny-Massachusetts Transmission Line) that will ensure more reliable power delivery to customers in and beyond the South Lake Union and Denny Triangle neighborhoods. The new substation, located on Denny Way near Stewart Street, will be City Light’s first and largest substation in 30 years. The Denny Substation Program will increase system-wide reliability and operational flexibility, achieving a major electrical system upgrade for the city of Seattle. For further information, visit the project website at: http://www.seattle.gov/light/dennysub/