Sound Transit
Connecting Northgate, Roosevelt, and U District neighborhoods to downtown Seattle and the airport via light rail, this project included excavating twin 4.3-mile tunnels and constructing three light rail stations. Challenging glacial tills and high groundwater pressures necessitated the use of diaphragm walls, secant piles, and ground freezing. The highly congested urban areas the project is located in required extraordinary coordination with the local communities and various government agencies including the University of Washington.
Sound Transit
Seattle, WA
2018
$499.1 million
Design-Bid-Build
