Salt Lake City

Salt Lake City & County Building seismic upgrades are now complete

The seismic upgrade work for the iconic Salt Lake City & County Building is now complete. A receiving system consisting of 16 tons of reinforcing steel, 285 cubic yards of concrete, and several new structural steel members was installed in less than a year.  Prior to constructing the new shoulder walls, crews removed more than 706 tons of existing foundation stone originally installed when the building was constructed in the 1890s.  

The Salt Lake City & County Building is an active City Hall, so work was performed with minimal disruption to employees and guests. Big-D mitigated noise during working hours by using the traditional “wedge-and-feather method” of stone removal, instead of typical jack hammers and other power tools. This unique method allowed crews to perform work during business hours.

The work conditions in the basement were challenging. Crews were often forced to crouch and crawl to install the receiving system components around the 447 base isolators supporting the building. Big-D is proud to report that 14,400 labor hours were performed on this project with no injuries recorded during construction. The efforts of VCBO Architecture, Reaveley Engineers, and City personnel for helping Big-D deliver the project on time and under budget. 

For more information on the project (including updates and frequently asked questions), please visit:

Photos of work available upon request.

About Big-D Construction

As one of the largest construction organizations in the country, Big-D’s family of companies includes more than 1000 associates and 49 years of experience providing Design-Build, General Contracting and Construction Management services to customers from a wide variety of industries. Regional offices are located in Salt Lake City, Ogden, Lindon and Park City, Utah; Pleasanton, California; Tempe, Arizona; Minneapolis, Minnesota; and Jackson Hole, Wyoming.  For more information, please visit: