HNTB-designed SR 99 project honored by AIA WA Council

The design team utilized scale, materiality and lighting to successfully integrate SR 99 infrastructure buildings into the fabric of the city.


BELLEVUE, Wash. (Oct. 15, 2020) –
The American Institute of Architects Washington Council honored the HNTB-designed SR 99 project with a Merit Award in its 2020 AIA WA Civic Design Awards. The award was announced at a virtual ceremony earlier this month.

According to AIA WA’s website, the 2020 Civic Design Awards celebrate the best examples of what can be realized when architects and civic clients work together to achieve quality design. The winning projects represent the finest standards in innovation, sustainability, building performance, and overall integration with the client and surrounding community.

“This is a tremendous honor for the Washington State Department of Transportation, HNTB and our project partners. The engineering challenges of designing a 1.7 mile, 58-foot-diameter tunnel beneath the city were met with a high degree of innovation,” said, Robert Steel, RIBA RIAS, HNTB’s director of design. “Architecturally, the design team utilized scale, materiality and lighting to successfully integrate infrastructure buildings into the fabric of the city.”

The SR 99 design-build project was led by Seattle Tunnel Partners, a joint venture between Dragados USA and Tutor Perini. Serving as lead designer and engineer of record for the complex project, HNTB was responsible for design of the bored mega-tunnel. The firm designed the permanent structures and facilities, including the tunnel liner, the interior stacked roadway structure, approach cut-and-cover tunnels, approach roadways and operations buildings located at each portal.

The American Institute of Architects Washington Council is a member-driven professional society for architects and associate architects in the State of Washington. AIA WA Council is the state arm of the National AIA and is focused primarily on policy and advocacy.