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Project Details

Arroyo Conduit Installation Project

Posting Date: 12/15/2017                

Contact: Thomas Gravell - Supervisor, Electrical Service Representative

Phone: (206) 386-1672

Project Update (7/23/2020)

Crews will be trenching and installing underground conduit on 42nd Avenue SW (between SW 108th and 109th streets) and SW 109th Street (towards 44th Avenue SW).

  • Street crossings will be required in these areas. Customers can expect traffic detours through these construction work areas. Flaggers and uniformed police officers will be present to direct traffic.
  • Maintenance power outages may be required to do the work safely. Affected customers will be notified in advance of any scheduled outage.
  • Please be aware that due to the nature of our work maintaining the electrical system, some essential tasks require crew members to work closely together for their safety. We ask that residents continue to adhere to social distancing guidelines when walking near a construction site. The safety of our customers and crews is our number one priority.
  • This work is in accordance with protocols in place to meet all COVID-19 guidelines from the Centers for Disease Control and Prevention, Washington State Department of Health, and Occupational Safety and Health Administration.

Project Overview

Underground, direct buried cables in the Arroyo neighborhood are approaching the end of their useful life and will require new electrical conduits and cables. Seattle City Light has identified several areas within the Arroyo neighborhood that will require installing new conduits, vaults, and other associated work. Streetlights will also be replaced as part of this work.

Construction Work Area

*To follow the progress of this work, please subscribe to our email updates or check our website each month.

Project Benefits

  • This work will result in enhanced electrical reliability and efficiency.

Project Impacts

  • City Light crews will be working in multiple locations at a time. Customers can expect temporary parking and traffic restrictions. Crews will work to limit traffic impacts.
  • Maintenance power outages are required to do the work safely. Affected residents will be notified in advance before any outage.
  • Trenching for conduits will occur in the public right-of-way (e.g. street and planting strips). Some sidewalk and driveway aprons will be affected. Trenches will be covered with steel plates or fenced off outside of construction work hours.
  • City Light crews will work closely with Seattle Department of Transportation's (SDOT) Urban Forestry group to ensure the protection of trees. SDOT staff may be onsite to monitor this work.
  • All affected areas will be restored and repaved, in accordance with SDOT guidelines.
  • Individual electrical service connections to new developments (homes/buildings) are not included in this work. The homeowner is responsible for installing conduit in their private property. Learn more at
  • Crews will be installing 3000K LED streetlights in several areas. The Cleveland style streetlight fixture will be installed in smaller, residential streets. The Arieta fixture will be installed along Marine View Drive. These installations are anticipated to occur after civil construction is completed.

    See photos for more information: Arroyo Streetlight Fixtures

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Construction Start: early to mid-May 2018

Duration: 18-20 months w/ additional streetlight work

Daily Work Schedule: Mon-Fri, 9am-3pm; weekends 9am-6pm, evenings

Alternate Contact: -

Alternative Contact Phone:

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    700 5th Avenue
    Suite 3200
    P.O. Box 34023
    Seattle, WA 98124-4023

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