HNTB Corp | SR 99 South Portal


Title: Urban Gateways: South Portal, SR99 Tunnel

Project: SR 99 Tunnel Project

Firm: HNTB Corporation

Summary: This gateway sits as the southern bookend of the Seattle waterfront and emphasizes the point of arrival to the city from the south. Travelers will experience a progression from the forested landscapes of the Puget Sound to the order and rhythm of the city. From there, one transitions to the language of the boulevard emerging with street trees and pedestrian scale environments. The landscaping associated with the tunnel’s South Operations Building establishes the railroad way as a pedestrian and open space corridor, linking the waterfront Pioneer Square and the stadium district. Serving as a prominent beacon, the building’s “safety yellow” ventilation stacks are a striking contrast to the surroundings.