SODO-CID alternatives

SODO-CID, the central segment of the corridor, includes stations at Chinatown/International District, Stadium and SODO. Link light rail will continue south of downtown Seattle toward a new terminus in West Seattle.


Explore the alternatives

Learn more

Use the map to the right to explore the different route options we're considering for the SODO-CID segment of the corridor. Select an alternative at the top of the page to learn more about the key takeaways for each alternative.

In case you missed us, review the presentation from our 9/11 open house and neighborhood forum.

ST3 Representative Project

The West Seattle Extension is along an elevated guideway through SODO towards downtown along the E-3 transitway, with an elevated station at SODO and an at-grade station at Stadium. The Ballard Extension enters into a cut-and-cover tunnel near Stadium Station and extends under 5th Avenue S with a new cut-and-cover station at S King Street, connecting with the existing International District/Chinatown Station.

What is the representative project and its alternatives?

The representative project is the voter-approved general route and station locations. The other alternatives for this segment are refined options of the route and station locations to be considered along with the representative project.

Massachusetts Tunnel Portal

The West Seattle Extension is along an at-grade guideway through SODO towards downtown along the E-3 transitway, with a stop at SODO Station, and connects into the existing Stadium Station. New roadway overcrossings at S Lander Street and S Holgate Street separate light rail from traffic. The Ballard Extension enters into a bored tunnel near S Massachusetts Street and 6th Avenue S, before turning west towards 5th Avenue S. Includes a new cut-and-cover station at S King Street, connecting with the existing International District/Chinatown Station.

How it compares to other alternatives:

  • New at-grade SODO station on E-3 transitway at S Lander Street
  • Transfer at existing SODO Station
  • Bus operations on E-3 transitway displaced
  • New grade-separated roadway crossings at S Lander Street and S Holgate Street improve existing rail/traffic/freight operations
  • Property effects at tunnel portal site
  • Avoids impacts to Ryerson Base
  • Shallow cut-and-cover station under 5th Avenue S; easy rider access/transfers
  • Construction effects, lane closures on 5th Avenue in station area
  • $200 million less than the cost of the ST3 Representative Project

Surface E-3

The West Seattle Extension is along an at-grade guideway through SODO towards downtown along the E-3 transitway, with a stop at SODO Station, and connects into the existing Stadium Station. New roadway overcrossings at S Lander Street and S Holgate Street separate light rail from traffic. The Ballard Extension enters into a cut-and-cover tunnel near Seattle Boulevard S and 5th Avenue S. Includes a new cut-and-cover station at S King Street, connecting with the existing International District/Chinatown Link Station.

How it compares to other alternatives:

  • New at-grade SODO Station on E-3 transitway at S Lander Street
  • Transfer at existing SODO Station
  • Bus operations on E-3 transitway displaced
  • New grade-separated roadway crossings at S Lander Street and S Holgate Street improve existing rail/traffic/freight operations
  • Shallow cut-and-cover station under 5th Avenue S; easy rider access/transfers
  • Construction effects, lane closures on 5th Avenue in station area
  • $400 million less than the cost of the ST3 Representative Project ($100 million less in the SODO sub-segment; $300 million less in the CID sub-segment)

4th Avenue Cut-and-Cover Chinatown-International District

The West Seattle Extension is along an elevated guideway through SODO towards downtown along the E-3 transitway, with an elevated station at SODO Station and an at-grade station at Stadium Station. The Ballard Extension enters into a cut-and-cover tunnel near Stadium Station and then turns west under 4th Avenue S with a cut-and-cover tunnel station south of S Jackson Street.

How it compares to other alternatives:

  • Shallow cut-and-cover station under 4th Avenue S; easy rider access/transfers
  • Major engineering/constructability constraints (4th Avenue Viaduct demolition/rebuild, active BNSF railway, existing transit tunnel, etc.)
  • Large property effects (King County Admin Building)
  • May cause potential schedule delay compared to the ST3 Representative Project
  • $600 million more than the cost of the ST3 Representative Project; requires third party funding of 4th Avenue Viaduct re-build

4th Avenue Mined Chinatown-International District

The West Seattle Extension is along an elevated guideway through SODO towards downtown along the E-3 transitway, with an elevated station at SODO Station. The Ballard Extension is along an at-grade guideway along the transitway near S Stacy Street before entering into a tunnel south of the transitway just north of S Massachusetts Street. The tunnel turns west under 4th Avenue S with a tunnel station south of S Jackson Street.

How it compares to other alternatives:

  • Deep mined station (~200') under 4th Avenue S with poor rider access/transfers
  • Major engineering/constructability constraints (4th Avenue Viaduct demolition/rebuild, active BNSF railway, existing transit tunnel, etc.)
  • Large property effects (Ryerson Base for tunnel portal site)
  • Results in very deep Midtown Station (~250 feet deep)
  • May cause potential schedule delay compared to the ST3 Representative Project
  • $500 million more than the cost of the ST3 Representative Project; requires third party funding of 4th Avenue Viaduct re-build

5th Avenue Mined Chinatown-International District

The West Seattle Extension is along an at-grade guideway through SODO towards downtown along the E-3 transitway, with a stop at SODO Station, and connects into the existing Stadium Station. New roadway overcrossings at S Lander Street and S Holgate Street separate light rail from traffic. The Ballard Extension enters into a bored tunnel near S Massachusetts Street and 6th Avenue S, before turning west towards 5th Avenue S. Includes a new deep mined station at S King Street, connecting with the existing International District/Chinatown Station.

How it compares to other alternatives:

  • Deep mined station (~200') under 5th Avenue S with poor rider access/transfers
  • Less construction effects, lane closures on 5th Avenue with mined station
  • Some property effects (for mined station access shaft)
  • Results in very deep Midtown station (~250 feet deep)
  • Similar cost to the ST3 Representative Project

Occidental Avenue

The West Seattle Extension is along an elevated guideway heading north on Occidental Avenue S with an elevated station at S Lander Street. The guideway turns east and becomes at-grade near S Walker Street and the E-3 transitway before turning north. Includes an at-grade station at Stadium Station. The Ballard Extension enters into a cut-and-cover tunnel near Seattle Boulevard S and 5th Avenue S. Includes a new cut-and-cover station at S King Street, connecting with the existing International District/Chinatown Station.

How it compares to other alternatives:

  • New elevated SODO station on Occidental Avenue S at S Lander Street
  • Transfer at existing Stadium Station
  • Long span bridges over BNSF tracks and longer track connection to maintenance facility
  • Bus operations on E-3 transitway partially displaced
  • Property effects along Occidental Avenue S, BNSF crossings and maintenance facility connection
  • $200 million more than the cost of the ST3 Representative Project (in the SODO sub-segment only)

The online survey is now closed. Read below to see the feedback we’ve received so far.

Speech bubble icon What your neighbors have said

Alternative details

 
Tunnel
 
At-grade
 
Elevated
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Station