South Lander Street Grade Separation Project

Revised March 28, 2013

This project was placed on hold as of March 2008 due to funding limitations. The future schedule of the project is unknown at this time, though the project remains a priority for SDOT.

The project would serve a need recognized in The Access Duwamish Report. The comprehensive study, of transportation and freight needs, recommended a series of projects to separate railroad tracks from street crossings, increasing safety and improving mobility. Thanks to the Bridging the Gap transportation funding package a type, size and location study was begun in 2003 for one of these projects, the South Lander Street Grade Separation.

The proposed bridge structure over the BNSF railroad tracks would touch down at First Avenue S and Fourth Avenue S, ultimately providing a roadway that would no longer be impacted by the railroad operations.

In January of 2007, SDOT staff and a design consultant began the early stages of design and the process of meeting with property owners immediately adjacent to the project.  However, this project was placed on hold as of March 2008 due to funding limitations. The future schedule of the project is unknown at this time, though the project remains a priority for SDOT.

Benefits of this important project:

• Improve safety on a road that currently crosses BNSF railroad tracks by separating vehicles and pedestrians from train activities.
• Improve access to SODO and the Duwamish industrial areas.
• Reduce traffic delays caused by train crossings, improving mobility and reliability for travel east and westbound between key south and northbound corridors.
• Enhance access to one of the largest port operations in the United States.
• Help keep traffic moving during the replacement of the Alaskan Way Viaduct.
  
  

1. Type, Size, and Location Study (Word format)
   
   
2. Vicinity Map (PDF format)
   
   
3. Photo Key (PDF format)
   
   
4. Photos in numerical order:
   
   01 - First Avenue S. and S. Lander Street - Facing East
   02 - Occidental Avenue S. - Facing South
   03 - Occidental Avenue S. - Facing North
   04 - Occidental Avenue S. and S. Lander Street - Facing East
   05 - BNSF Tracks and S. Lander Street - Facing Southeast
   06 - BNSF Tracks and S. Lander Street - Facing South
   07 - Third Avenue S. and S. Lander Street - Facing West
   08 - Third Ave S. - Facing South
   09 - Third Ave S. - Facing North
   10 - BNSF Tracks and S. Lander Street - Facing Northwest
   11 - BNSF Tracks and S. Lander Street - Facing North
   
   Drawings
   
   
5. Plan and Profile
   
   
6. Plan View At-Grade
   
   
7. Typical Roadway Cross-Section
   
   
8. Concrete Box Girder Bridge Plan and Elevation
   
   
9. Concrete Box Girder Bridge Typical Section
   
   Other Concepts Considered
   
   
10. 2 Lane Overcrossing Concept
    
    
11. 4 Lane Undercrossing Concept
    
    
12. 2 Lane Undercrossing Concept
    
    
13. Option 1A - Steel Girder Bridge Plan and Elevation
    
    
14. Option 1A - Steel Grider Bridge Typical Section
    
    
15. Option 1B - Dual Pony Truss Bridge Plan and Elevation
    
    
16. Option 1B - Dual Pony Truss Typical Section
    
    Turning Movement Analysis
    
    
17. First Avenue S. and S. Lander Street WB-67 Turning Movements
    
    
18. First Avenue S. and S. Lander Street WB-67 Turning Movements
    
    
19. Occidental Avenue S. WB-50 Northbound Turning Movements
    
    
20. Occidental Avenue S. WB-50 Southbound Turning Movements
    
    
21. Occidental Avenue S. WB-67 Northbound Turning Movements
    
    
22. Occidental Avenue S. WB-67 Southbound Turning Movements
    
    
23. Third Avenue S. and S. Lander Street WB-67 Turning Movements
    
    
24. Fourth Avenue S. and S. Lander Street WB-67 Turning Movements
    
    
25. Fourth Avenue S. and S. Lander Street WB-67 Turning Movements