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Spokane Street Viaduct Widening Project
Current Detour Section
Revised September 1, 2009
Closures to the lower roadway of South Spokane Street occur during certain portions of this project, requiring detours for through traffic. Below find the:
- Projected time frames and locations of closures
- Recommended detour route
- Alternate routes into downtown or southbound from West Seattle
Approximate Time Frame (Quarters) |
Roadway Closure and Direction |
Between |
Second Quarter 2008 to Third Quarter 2010 |
Eastbound Lower Spokane |
1st Ave S and 4th Ave S |
Fourth Quarter 2008 to First Quarter 2010 |
Eastbound Lower Spokane |
4th Ave S and 5th/E-3 Busway |
Fourth Quarter 2008 to Fourth Quarter 2009 |
Eastbound Lower Spokane |
5th/E-3 Busway and 6th Ave S |
Third Quarter of 2009 |
Eastbound Lower Spokane |
East Marginal Way to 1st Ave S |
Third Quarter 2009 to Fourth Quarter 2011 |
Westbound Lower Spokane |
6th Ave S to 1st Ave S |
Second Quarter 2010 to Fourth Quarter 2011 |
Westbound Lower Spokane |
1st Ave S to E. Marginal Way S |
Fall 2009 (permanently) |
Existing Westbound Off-Ramp to Fourth Ave S |
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Spring 2010 (permanently) |
Existing Westbound On-Ramp from First Ave S |
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Extended lane closures are NOT expected for the upper roadway (i.e., on the Spokane Street Viaduct itself).
 Current Signed Detour route: Spokane eastbound detour
For through traffic from East Marginal Way toward I-5:
- North on EAST MARGINAL to HANFORD,
- East on HANFORD to 1 ST,
- North on 1st to LANDER,
- East on LANDER to 6th, and
- South on 6th to return to the SPOKANE STREET lower roadway
These streets will all be operating normally, in two directions. Signals along these routes have been adjusted to reduce congestion, but greater congestion and slower transit times should be expected.
The same detour, in the reverse direction, will also be used during westbound street closures. Pedestrian access on South Spokane Street and local business access will be maintained by the contractor.
Alternate Routes:
Alternate routes for commuters from West Seattle into downtown include:
- North on SR-99 to downtown exits at Seneca and Western Ave.
- North on East Marginal Way S/Alaskan Way S to Atlantic, Royal Brougham, King, Main, or Yesler.
- Stay on the Spokane Street Viaduct to I-5, then North on I-5 to downtown exits.
Alternate routes for commuters from West Seattle southbound include:
- South on East Marginal Way to Michigan, east to I-5
- South on East Marginal Way to First Avenue South Bridge, connect to I-509
- South on East Marginal to Lucille, then east to First or Fourth Avenues or Airport Way, then north or south on any of those arterials
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