Archive for the ‘Engineering’ category

Overview of Pepco’s Capital Grid Project

May 2, 2017

Diagram showing existing (green) and new (yellow) substations that will be involved in Pepco’s Capital Grid Project.

On the evening of May 1st, Pepco hosted Ward 1 Advisory Neighborhood Commissioners to brief them on their upcoming Capital Grid Project. The project’s goal is to build an underground transmission route through the District from the north to the south. This is necessary to create multiple pathways of power supply to connect multiple substations in the Capital area with higher electrical load capacity. In short, this creates a “networked system” that improves reliability and resiliency.

The underground transmission lines will be constructed from the Takoma Substation in Prince George’s County through the District to the Waterfront Substation. The feeders will travel approximately 10 miles, connecting five substations: Takoma, Harvard, Champlain, Mount Vernon (proposed) and Waterfront. The flexibility this will create will support faster service restoration and reduce the potential impact of major unforeseen event.

In our area, work will begin around Fall 2018/Winter 2019 in the area of New Hampshire and Georgia avenues and move south along Georgia Avenue through the Spring/Summer of 2019. On Georgia Avenue, the scope of work will close two of the four lanes as new transmission cables are put underground via trenching. Each night steel plates will cover the trenches. Work will continue down Georgia to Harvard or Gresham, before turning west to the Harvard Street substation.

The Havard Street Substation will also be upgraded and expanded as part of this project, with work commencing as early as 2019 and estimated to be completed around 2022 or 2023.

I will continue to share more information about the construction aspect of this project as we get nearer to the start date. Pepco will also be sharing information directly to the community.

Sixteenth Street Bridge Decorated for the Season

December 23, 2013

Sixteenth Street bridgeOver the weekend I noticed that the Sixteenth Street Bridge — located just south of Arkansas Avenue on the Ward 1/4 border — was decorated for the season. I suspect that this is a tradition, but don’t know how long the bridge has been decorated in December.

Whether decorated or not, the bridge is a handsome structure that was built by the Pennsylvania Bridge Company and Cranford Paving Company from 1907 to 1910. It was designed and directed by the D.C. Bridge Division to span the Piney Branch Valley below.

Those familiar with the bridge may know that the four tigers — a pair flanking both ends of the bridge — were designed by sculptor Alexander Phimister Proctor in 1910. These predate the bisons that Proctor designed for the Q Street (or “Buffalo”) Bridge in 1916.

What many people may not know is that the Sixteenth Street Bridge is notable for being the first parabolic arch constructed in the United States, making it a noteworthy engineering feat.

If you want to learn more about the bridge, you can open the bridge’s data pages on the Library of Congress Web site.

Sixteenth Street Bridge


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