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Seattle City Light DEBRA SMITH, General Manager and CEO
Denny Substation Project
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Construction [Denny Network]

Construction Update


City Light's contractor, Shimmick Construction Company, Inc. (SCCI), began construction of the network in February 2016. Work begins with the installation of vaults, followed by the installation of a duct bank system that connects the vaults. Street restoration will conclude each stage. The network map (below) displays a view of where underground electrical duct banks are being installed, what has been accomplished (as of 4/1/18), and what work remains.

South of Denny Way, the vaults have been installed and there are only two small areas along 6th Avenue that remain unfinished.

North of Denny Way, all the vaults have been installed. SCCI has multiple crews simultaneously installing duct bank; restoring roads, sidewalks and ADA ramps; and installing pedestrian lighting and landscaping. The final stage after roadway restoration will be installing the asphalt driving surface. This is scheduled to begin in the 2nd quarter of 2018.


Distribution Network


The Denny Network is being built underground in South Lake Union and the Denny Triangle. Construction is occurring by block and mostly in the public right-of-way. Typical impacts include daytime and nighttime work, parking restrictions, transit and pedestrian detours, dust, and noise. Work sometimes requires lane restrictions and street detours, but streets typically remain open to traffic during construction.

Below are examples of what typical construction activity looks like in the project area.

demolition example photo

Potholing to confirm utility locations

excavation example photo

Excavation

installation example photo

Shoring (trench reinforcement)

restoration example photo

Duct Bank Installation

demolition example photo

Vault Installation

excavation example photo

Back Filling Vault

installation example photo

Temporary Street Restoration

installation example photo

Final street restoration


Network construction, occurring over a period of approximately 24 months, consists of the following steps:
  • Locating underground utilities
  • Excavating and removing concrete and asphalt
  • Installing duct banks and electrical vaults
  • Backfilling excavation
  • Installing permanent concrete and asphalt pavement
  • Repairing and installing sidewalks, curb ramps and curb bulbs
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Project Hotline:
(206) 257-2142

Email Address:
SCL_DennySub@seattle.gov

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


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