Locale : North America (English)
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A critical link in the Sound Transit network

To meet growing demand and the needs of the 2010 Olympics, the 770 Airport Link connects downtown Seattle with Sea-Tac Airport.


2010 Engineering Excellence Gold Award, American Council of Engineering Companies (Washington)

National Recognition Award - ACEC


Undertaken to create flexibility for future capacity and the 2010 Winter Olympics in nearby Vancouver, BC, the 770 Airport Link is a critical component of Seattle’s Sound Transit network.

Connecting downtown Seattle to Seattle-Tacoma International Airport, the 1.7-mile (2.7-kilometer) LRT guideway includes 0.9 miles (1.4 kilometers) of elevated trackwork, three long span structures over key highways and roads, a pedestrian bridge and drop-off area, and a signature station at the south terminus.


Mott MacDonald had been previously contracted to design Sound Transit’s 5-mile Tukwila alignment. We were chosen again for the 770 Airport link as a follow-on assignment.

The preliminary and final design of the alignment was our responsibility, and drew expertise from in-house civil, rail alignment, structural, station architecture, geotechnical, survey, landscape architecture, traffic and systems integration subgroups.


Our alignment design was optimized to allow for minimum intrusion into the Seattle landscape while maximizing LRT vehicle speed.

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