3 Line (Sound Transit)

Future light rail line in Seattle, Washington, U.S. From Wikipedia, the free encyclopedia

The 3 Line (colored magenta) is a future light rail line in the Seattle metropolitan area in the U.S. state of Washington, to be part of Sound Transit's Link light rail system. It is planned to connect Everett and Snohomish County to Downtown Seattle and West Seattle. The 3 Line would share tracks with the 2 Line from southern Everett to International District/Chinatown station along the 1 Line corridor.[2]

Quick Facts Overview, Status ...
3 Line
Overview
StatusPlanned
OwnerSound Transit
LocaleSeattle metropolitan area, Washington, US
Termini
Stations25 (9 new, 1 provisional)
Service
TypeLight rail
SystemLink light rail
History
Planned opening2032 (West Seattle)
2037 (Southwest Everett)
2041 (Downtown Everett)[1]
Technical
Number of tracks2
CharacterUnderground, elevated, and surface
Track gauge4 ft 8+12 in (1,435 mm) standard gauge
ElectrificationOverhead line, 1,500 V DC
Operating speed55 miles per hour (89 km/h)
Route map

Provisional route
Everett Station (2041)
SR 526/Evergreen (2041)
SW Everett Industrial Center (2037)
SR 99/Airport Road (provisional) (TBD)
Mariner (2037)
Ash Way (2037)
West Alderwood (2037)
Everett Link Extension
Lynnwood City Center
Mountlake Terrace
Shoreline North/185th
Shoreline South/148th
Pinehurst (2026)
Northgate
Roosevelt
U District
University of Washington
Capitol Hill
to Ballard (2039)
Westlake
Symphony
Pioneer Square
International District/
Chinatown
to Downtown Redmond (2025)
Stadium
reroute (2039)
SODO
West Seattle Link Extension (2032)
Delridge
Avalon
Alaska Junction
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The line is planned to reuse existing tracks that are part of the 1 Line and its future expansions; the 1 Line will then be rerouted through a new Downtown Seattle tunnel to be built for the Ballard Link Extension.[3] The 16.3-mile (26.2 km) Everett Link Extension to the north of Lynnwood will have six stations and is scheduled to open between 2037 and 2041.[4] The 4.7-mile-long (7.6 km) West Seattle Link Extension will include three new stations southwest of SODO station and is scheduled to open in 2032.[5] The 3 Line was created as part of the Sound Transit 3 program, approved by voters in 2016, which included both projects.[6]

The West Seattle Link Extension would include a high bridge crossing the Duwamish River adjacent to the existing West Seattle Bridge. In 2024, Sound Transit and HNTB proposed a cable-stayed bridge design that would be 1,690 feet (520 m) long and have two towers that are 374 feet (114 m) tall.[7] The western end of the line would be tunneled between Alaska Junction and Avalon stations, where trains would begin to use an elevated guideway.[8] The Federal Transit Administration issued their preliminary approval for the project via a record of decision in April 2025.[9] The project is expected to cost $6.7 to $7.1 billion to construct and carry 26,000 daily passengers.[10][11]

The Everett Link Extension includes a new operations and maintenance facility that is scheduled to open in 2034 at one of three sites near Paine Field and the Boeing Everett Factory.[12] The project is estimated to cost between $5.05 billion and $6.9 billion and open either as a single phase in 2037 with its funding shortfall addressed or in two phases from 2037 to 2041.[13]

Stations

Names and locations for future stations are provisional.

More information Station, City ...
Station City Location Planned
opening

[1]

Type Connections and notes
Everett Link Extension (Everett Station to Lynnwood City Center)
Everett Station Everett 3201 Smith Avenue 2041 Elevated Transfer to Sounder commuter rail, Amtrak, Swift Bus Rapid Transit
SR 526/Evergreen Everett State Route 526 at Evergreen Way 2041 Elevated
SW Everett Industrial Center Everett State Route 526 at Airport Road 2037 Elevated
SR 99/Airport Road Everett Airport Road at State Route 99 TBD Elevated Provisional station
Mariner Everett 4th Avenue West at 128th Street Southeast 2037 Elevated 2 Line terminus[2]
Ash Way Lynnwood Interstate 5 at 164th Street Southwest 2037 Elevated
West Alderwood Lynnwood Vicinity of Alderwood Mall 2037 Elevated
West Seattle Link Extension (SODO to Alaska Junction)
Delridge Seattle Delridge Way Southwest near Southwest Genesse Street 2032 Elevated
Avalon Seattle Southwest Avalon Way near 35th Avenue Southwest 2032 Retained cut[14]
Alaska Junction Seattle Southwest Alaska Street near California Avenue Southwest 2032 Underground
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References

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