Alert: The 9/11 Pentagon Memorial is closed to visitors, effective August 2, 2021.
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Pentagon Memorial Construction Timeline

The Pentagon’s Washington Headquarters Service (WHS) had overall responsibility for the construction of the Memorial, with the Pentagon Renovation & Construction Program Office (PENREN) serving as the construction agent and providing overall project management support. The Pentagon awarded a contract to design and build the Pentagon Memorial to Centex-Lee, LLCĀ  in August of 2003. Centex-Lee, along with its subcontractors, was responsible for completing all design and construction activities for the Pentagon Memorial. During the contract, Centex Lee was acquired by Balfour Beatty, PLC.

The Pentagon Memorial Fund is very grateful to Chris Hartzler, Senior Project Manager for Balfour Beatty, and to PENREN for sharing the photographs that make up the Constructution Timeline.

Explore the construction timeline, by clicking below, to learn about the process of building the first national 9/11 memorial, from groundbreaking to completion.

 

Note: The interactive timeline is optimized for Internet Explorer 8 and higher and Firefox 4.0 and higher. If you have trouble viewing the timeline, please upgrade to the latest version of your browser.

Saturday September 11, 2001

Groundbreaking Ceremony - photo
06/05/2006
Groundbreaking Ceremony
Start Mass Excavation for Memorial - photo
06/21/2006
Start Mass Excavation for Memorial
Mass Excavation Complete - photo
09/29/2006
Mass Excavation Complete
Site Prep Phase Complete - photo
02/28/2007
Site Prep Phase Complete
First Memorial Unit Production Cast - photo
05/29/2007
First Memorial Unit Production Cast
Complete Foundations - photo
06/21/2007
Complete Foundations
First Basin Set - photo
08/08/2007
First Basin Set
First Memorial Unit Set - photo
02/12/2008
First Memorial Unit Set
Complete Age Wall Construction - photo
02/27/2008
Complete Age Wall Construction
Start Memorial Unit Granite Installation - photo
03/06/2008
Start Memorial Unit Granite Installation
First Tree Planting - photo
04/23/2008
First Tree Planting
Start Age Line Install - photo
04/23/2008
Start Age Line Install
Start Gravel Pave Surfacing - photo
05/19/2008
Start Gravel Pave Surfacing
Complete Perimeter Granite - photo
05/30/2008
Complete Perimeter Granite
Last Memorial Production Unit Cast - photo
07/01/2008
Last Memorial Production Unit Cast
Plantings Complete - photo
07/07/2008
Plantings Complete
Complete Gateway Construction - photo
07/30/2008
Complete Gateway Construction
Memorial Construction Complete - photo
08/01/2008
Memorial Construction Complete
Dedication - photo
09/11/2008
Dedication
06/05/2006

Groundbreaking Ceremony

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06/21/2006

Start Mass Excavation for Memorial

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09/29/2006

Mass Excavation Complete

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02/28/2007

Site Prep Phase Complete

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05/29/2007

First Memorial Unit Production Cast

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06/21/2007

Complete Foundations

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08/08/2007

First Basin Set

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02/12/2008

First Memorial Unit Set

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02/27/2008

Complete Age Wall Construction

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03/06/2008

Start Memorial Unit Granite Installation

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04/23/2008

First Tree Planting

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04/23/2008

Start Age Line Install

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05/19/2008

Start Gravel Pave Surfacing

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05/30/2008

Complete Perimeter Granite

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07/01/2008

Last Memorial Production Unit Cast

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07/07/2008

Plantings Complete

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07/30/2008

Complete Gateway Construction

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08/01/2008

Memorial Construction Complete

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09/11/2008

Dedication

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