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Project Details

Roy Street Loop (SE of Lake Union)

Posting Date: 12/19/2017                

Contact: Mark Green - Crew Chief

Phone: (206) 735-0321

PROJECT UPDATE (7/19/2018)

Crews have installed the second of two vaults on Minor Avenue North between Valley and Roy streets. They continue to make connections between those vaults and have moved onto the second phase of the project. Phase 2 involves excavating for and installing a group of conduits (duct bank) on Roy Street. See the map for Phase 2 below.


Seattle City Light crews are taking steps to enhance electrical reliability for customers in an area southeast of South Lake Union. The new underground electrical facilities are designed to connect customers with the Denny Substation network system. City Light crews will install three (total) new electrical vaults and a new duct bank system for underground conduit.

At a future date, this Roy Street Loop project will include similar work in these additional phases: a street crossing at Minor Avenue North and Valley Street and work on Minor Avenue North, for approximately 40 feet, to the north of its intersection with Valley Street. The sequence of these additional phases will need coordination, so will be communicated at a future date.



The project will increase electrical reliability since the area will have power from the redundant network system.


During Phase 2, the crews will excavate for and install approximately 250 lineal feet of duct bank between Minor Avenue North and Fairview Avenue North on Roy Street.

  • There are no power outages expected during the project.
  • During Phase 2, equipment will be parked on the north side of Roy Street, with construction taking place on the south side. See map.
  • Customers can expect noise from saw cutting and breaking concrete in the initial parts of the work. The noise will lessen as the work transitions to excavation.
  • Police officers will be onsite to help with local access on Roy Street should it be required.


Construction Start: Mid-January 2018

Duration: Estimated for completion in late August 2018

Daily Work Schedule: 9 a.m.-3 p.m., M-F; & 9 a.m.-6 p.m., Sat.-Sun.

Alternate Contact: -

Alternative Contact Phone:

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