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, LLC 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

      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/01-92x92.jpg"
        alt="Groundbreaking Ceremony - photo"
        title="Groundbreaking Ceremony"
      >
    
        06/05/2006
      
      Groundbreaking Ceremony
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/04-92x92.jpg"
        alt="Start Mass Excavation for Memorial - photo"
        title="Start Mass Excavation for Memorial"
      >
    
        06/21/2006
      
      Start Mass Excavation for Memorial
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/06-92x92.jpg"
        alt="Mass Excavation Complete - photo"
        title="Mass Excavation Complete"
      >
    
        09/29/2006
      
      Mass Excavation Complete
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/07-92x92.jpg"
        alt="Site Prep Phase Complete - photo"
        title="Site Prep Phase Complete"
      >
    
        02/28/2007
      
      Site Prep Phase Complete
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/08-92x92.jpg"
        alt="First Memorial Unit Production Cast - photo"
        title="First Memorial Unit Production Cast"
      >
    
        05/29/2007
      
      First Memorial Unit Production Cast
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/14-92x92.jpg"
        alt="Complete Foundations - photo"
        title="Complete Foundations"
      >
    
        06/21/2007
      
      Complete Foundations
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/19-92x92.jpg"
        alt="First Basin Set - photo"
        title="First Basin Set"
      >
    
        08/08/2007
      
      First Basin Set
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/24-92x92.jpg"
        alt="First Memorial Unit Set - photo"
        title="First Memorial Unit Set"
      >
    
        02/12/2008
      
      First Memorial Unit Set
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/16-92x92.jpg"
        alt="Complete Age Wall Construction - photo"
        title="Complete Age Wall Construction"
      >
    
        02/27/2008
      
      Complete Age Wall Construction
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/30-92x92.jpg"
        alt="Start Memorial Unit Granite Installation - photo"
        title="Start Memorial Unit Granite Installation"
      >
    
        03/06/2008
      
      Start Memorial Unit Granite Installation
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/43-92x92.jpg"
        alt="First Tree Planting - photo"
        title="First Tree Planting"
      >
    
        04/23/2008
      
      First Tree Planting
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/22-92x92.jpg"
        alt="Start Age Line Install - photo"
        title="Start Age Line Install"
      >
    
        04/23/2008
      
      Start Age Line Install
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/31-92x92.jpg"
        alt="Start Gravel Pave Surfacing - photo"
        title="Start Gravel Pave Surfacing"
      >
    
        05/19/2008
      
      Start Gravel Pave Surfacing
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/15-92x92.jpg"
        alt="Complete Perimeter Granite - photo"
        title="Complete Perimeter Granite"
      >
    
        05/30/2008
      
      Complete Perimeter Granite
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/11-92x92.jpg"
        alt="Last Memorial Production Unit Cast - photo"
        title="Last Memorial Production Unit Cast"
      >
    
        07/01/2008
      
      Last Memorial Production Unit Cast
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/33-92x92.jpg"
        alt="Plantings Complete - photo"
        title="Plantings Complete"
      >
    
        07/07/2008
      
      Plantings Complete
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/34-1-92x92.jpg"
        alt="Complete Gateway Construction - photo"
        title="Complete Gateway Construction"
      >
    
        07/30/2008
      
      Complete Gateway Construction
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/39-92x92.jpg"
        alt="Memorial Construction Complete - photo"
        title="Memorial Construction Complete"
      >
    
        08/01/2008
      
      Memorial Construction Complete
    
      <img width="92" height="92"
        src="https://www.pentagonmemorial.org/app/uploads/2021/07/41-92x92.jpg"
        alt="Dedication - photo"
        title="Dedication"
      >
    
        09/11/2008
      
      Dedication