Missouri State Capitol Stone Restoration

Jefferson City, Missouri

Client: State of Missouri

Size: 329,000

Trivers Role: Lead Architect, Historic Architect

Photographer: Sam Fentress

Perched on the bluffs of the Missouri River, the 1917 Missouri State Capitol is a remarkable domed structure, showcasing extensive use of premier local materials. Many of the meticulously maintained interior features are a source of pride for the state’s citizens and have received national acclaim. The exterior stonework, while equally as impressive, had succumbed to decades of weathering.

Trivers was engaged by the State of Missouri to evaluate the existing building conditions and address stone degradation, aiming to implement innovative repair solutions. As the lead architect and historic architect for the 329,000 sf project, Trivers developed design strategies to meet the State’s primary goals: life safety, water management, and aesthetics.

The design team provided detailed repair and cleaning specifications for the limestone across the ¼ mile of the building’s façade and up to the 340-foot height of the lantern above the dome. Each stone on the facades was numbered, and unique repair instructions were documented for each one. All sky-facing surfaces were treated with modern waterproofing materials or covered with new period-correct, lead-coated copper. Additionally, the project included replacing severely deteriorated paving stones and refurbishing historic cast-iron light fixtures and statues around the building.

Consultants on the project included Wiss, Janney, Elstner Associates; McClure Engineering (Columbia, MO); Pillar Design Group; The Russell Group Ingenium; SSC Engineering; and Randy Burkett Lighting Design.

Despite the challenges of working on a fully occupied and operational building, the design and construction were successfully completed on a multi-year project schedule. This quality renovation ensures the Missouri State Capitol will continue to serve the public for the next 100 years.

Awards:

Honor Award with Citation for Preservation, American Institute of Architects Mid-Missouri

Pinnacle Award, Natural Stone Institute

Acanthus Award, Chicago-Midwest Chapter of the Institute of Classical Architecture & Art

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