Pioneer Square Pergola Repair and Restoration
Location: Seattle, WA
The Pioneer Square Pergola, a National Historic Landmark in Seattle, was originally constructed in 1910 as a grand entrance to a below-grade comfort station (restrooms). Made of cast iron, it remains one of the city’s most iconic landmarks. After a vehicular collision caused the structure to collapse in 2001, we led a meticulous restoration effort to repair and preserve its historic integrity while meeting modern seismic and building codes.
Collaborating with the project fabricator, we developed an innovative solution to add an internal steel structure within the existing cast iron framework, maintaining the historic “skin” while providing the necessary support. The project also included structural design at the structure’s base to accommodate potential future restoration of the original restrooms below.
With no original design documentation, the team worked closely with the engineering consultants and contractor to ensure precise reinstallation and adherence to National Park Service Standards, bringing this cherished Seattle landmark back to life.
