Dorchester Heights Monument Restoration
One of eight sites that make up Boston National Historic Park, this prominent South Boston landmark has experienced chronic moisture problems, despite multiple restorations over the years. Today, 3D modeling helped SmithGroup determine the true cause and design a sustainable solution.
Client
National Park Service
Location
Boston, Massachusetts
Markets/Services
Historic Preservation, Cultural, Historic Sites & Monuments, Federal, Federal Cultural
The quest for American independence took a major step forward at Dorchester Heights, one of the highest spots in Boston. General George Washington and his troops were able to fortify the high hill overlooking the Boston harbor with a ring of cannons, prompting the British to flee the city in March 1776. The115-foot-high marble monument erected in 1902 marks the occasion, Washington’s first victory in the Revolutionary War. The design was a result of a well-publicized competition with the firm of Peabody and Stern being selected as the winners.
A century of exposure had taken its toll on the Georgian Revival structure. The National Park Service engaged SmithGroup to evaluate the monument’s condition, which had chronic moisture problems and structural deficiencies.
SmithGroup’s integrated team—with expertise in historic preservation, structural engineering, mechanical engineering, electrical and plumbing—examined schematics and modeling options for passive ventilation, which was likely part of the monument’s original design. This computer modeling utilized a 3D constructed version of the monument that was then run through programming that considers weather conditions, humidity and temperature fluctuation, thermal dynamics, and air flow. The team also analyzed ways to improve accessibility to the site.
The shifting of the structure over time had resulted in dislocated stones and cracks in the masonry. The SmithGroup team analyzed the many attempts at structurally bracing the monument over time to design long-term solutions to correct these chronic issues. Similarly, masonry cleaning and repairs were planned and undertaken to address soiling of the stone and localized cracks and stone spalls.
As the United States celebrates 250th anniversary of independence in 2026, improvements to the Dorchester Heights Monument ensures that another century visitors can experience and learn from pivotal events in our nation’s history.