Mount Si, photo by Seattle City Light employee, Todd Andrews
Seattle City Light LARRY WEIS, General Manager and CEO
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Project Details

H-Frame Replacement

Posting Date: 8/22/2014                

Contact: Mary Junttila - Project Coordinator

Phone: (206) 684-3825

PROJECT UPDATE (4/13/2016)

Work within City Light’s Transmission Right of Way between I-5 and Beacon Ave S (near S 109th St & 47th Ave S and adjacent to Beacon Ave S, south of S 107th) is complete. Contracted crews will be transporting planting materials into and working within City Light's electrical transmission line right-of-way near E Marginal Way S at S 112th St in Tukwila during the fall. The work is necessary to restore the right-of-way and its associated wetlands.

Concrete sidewalk restoration along E Marginal Way S at S 112th Street in Tukwila is complete; no additional traffic impacts (sidewalk and vehicle/bike lane closures) are anticipated. However, truck movement to and from City Light’s Right of Way on the east side of E Marginal at S 112th will continue until all restoration is complete


Seattle City Light has replaced aging wooden H-Frame structures with new steel monopoles that now support transmission, distribution and communication lines. Contracted crews constructed new foundations and towers in City Light right-of-way and restored the right-of-way under the power lines and the associated wetlands. Planting will continue throughout the fall this year. Mitigation establishment, including plant monitoring and maintenance will continue for several years to ensure that improvements are successful.


The project will improve system safety and critical City Light communications, and increase electrical reliability and capacity for customers.


The project corridor extends from City Light's Creston-Nelson substation, located at 5300 South Bangor Street, proceeds west across Beacon Avenue South, Interstate Highway 5, the Union Pacific and Burlington Northern Santa Fe Railroads, and proceeds west to East Marginal Way South. All of this work will be within City Light's Transmission Right-of-Way and/or within City of Seattle or City of Tukwila street Right-of-Way.


Construction Start: Started Summer 2013

Duration: Approximately 2.5 years

Daily Work Schedule: Completion expected Fall 2016

Alternate Contact: -

Alternative Contact Phone:

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