This is a list of megaprojects in the Seattle area. For this list, a megaproject follows the often cited definition of $1 billion (2017 dollars) or more.
Name | Type | Status | Cost | Notes |
---|---|---|---|---|
Sound Transit 3 | Transit | In progress | $54 billion[1] | Divided between several projects, to open between 2024 and 2041 |
Vancouver B.C.–Seattle–Portland high-speed railway | Transit | Proposed | $24–$42 billion[2][3] | Initiative of the Pacific Coast Collaborative between state and provincial governments |
State Route 520 bridge replacement and corridor program | Road | In progress | $4.56 billion[4] | New bridge opened in April 2016, rest of corridor anticipated to be complete by 2029 |
Alaskan Way Viaduct replacement tunnel | Road tunnel | Completed in 2019 | $4.25 billion (2009 est.)[5] | |
Amazon headquarters, Seattle | Office buildings | In progress | $4 billion[6] | |
East Link Extension | Transit line | In progress | $3.7 billion[7] | Scheduled to open in 2023 |
Lynnwood Link Extension | Transit line | In progress | $2.9 billion[8] | Scheduled to open in 2024 |
Interstate 405 (Eastside) improvements | Road | In progress | More than $2.8 billion[9] | 2003 Nickel and 2005 Transportation Partnership Account: $1.5 billion; 2015 Connecting Washington package: $1.3 billion |
Central Link, Seattle and Tukwila | Transit line | Completed in 2009 | $2.44 billion[10] | |
Spring District, Bellevue | Urban development | In progress | $2.3 billion[11] | Scheduled to open in phases from 2017 to 2026 |
Puget Sound Gateway (SR 167 and SR 509) | Road | In progress | $1.989 billion[12] | |
Northgate Link tunnel | Transit tunnel | Completed in 2021 | $1.9 billion[13] | |
Brightwater Tunnel | Sanitation infrastructure | Completed in 2011 | $1.8 billion[14] | First billion-dollar tunnel in Seattle |
University Link tunnel | Transit tunnel | Completed in 2012 | $1.7 billion[15] | Completed $200 million under budget. Central Link light rail service began in 2016. |
Interstate 5 HOV lanes in Tacoma and Fife | Road expansion | In progress | $1.6 billion[16] | Scheduled to be complete in 2022 |
Yesler Terrace redevelopment | Urban development | In progress | $1.5 billion[17] | May increase to $1.7 billion |
Lincoln Square expansion, Bellevue | Urban development | Completed in late 2017 | $1.2 billion[18] | |
Seattle–Tacoma International Airport third runway | Airport infrastructure | Completed in 2008 | $1.1 billion[19] | Does not include $200 million in soundproofing for schools |
Seattle seawall replacement | Shoreline infrastructure | Completed in 2017 | $1.07 billion (2014 estimate)[20] | |
Mount Baker Tunnel | Road tunnel | Completed in 1986 | Over $1 billion[21] | Earliest billion-dollar project on this list |
Point Ruston | Urban development | In progress | $1 billion[22] | |
Snoqualmie Ridge | Master-planned community | Completed in 2018 | $1 billion[23] | Made suburb of Snoqualmie the fastest growing city in Washington (2010) |
Hewitt Avenue Trestle replacement (U.S. Route 2, Everett) | Road bridge | Proposed | $620 million to $2 billion[24] | |
Puget Sound salmon recovery–culvert replacement | Stream restoration | In progress | $3.7 billion[25] | Began in 1991, expanded by June 2018 U.S. Supreme ruling in favor of tribal fisheries rights. Projected to continue through 2030.[25] |
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