SR 510 - Yelm Loop - New Alignment Phase 2

Project news

Needs & benefits

Why is WSDOT proposing to complete the SR 510 Yelm Loop?
State Route 510 is a two-lane highway that is often congested in the Yelm area during peak commute hours. Congestion can also be heavy when drivers are diverting around crashes or other incidents on I-5 and during the summer travel season.

SR 510/Yelm Avenue is the main street through Yelm. Heavy traffic congestion has the potential to negatively affect emergency response times and economic vitality.

This project would improve travel times for regional traffic, reduce the volume of regional traffic in downtown Yelm, help reduce the potential for collisions on Yelm Avenue and provide new non-motorized route for cyclists and pedestrians. Phase 2 is proposed to have a shared use path on one side of the proposed new section of highway. 

Next steps: WSDOT is undertaking a Practical Solutions process to move forward on this project. WSDOT has re-engaged stakeholders and is taking a fresh look at previous project plans. The fresh look will include reviewing the project’s purpose and need to ensure the proposed design is still appropriate and will provide intended benefits. The process includes evaluating traffic control at each intersection along the proposed alignment, and updating the project’s environmental documents. 

The End Result
In this project, crews will build the 3 remaining miles of SR 510 between Cullens Road and 170th Street Southeast. The new connection, like the previously built Phase 1, is proposed to be a two-lane highway with bicycle and pedestrian facilities.

Project Benefits

  • Help reduce regional congestion through the business core.
  • Help reduce the potential for collisions.
  • ​Provide a new route for bicyclists and pedestrians.


  • Spring 2018 - Stakeholder involvement 
  • Spring 2018 - Project design  
  • Summer 2018/Early 2020 - Environmental reevaluation
  • Summer 2020  - Project advertised for competitive bidding
  • Early 2021 - Construction 
  • Late 2022 – Completed


Financial Data for PIN 351029A
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $0
CWA $58,500
Total $58,500


Doug Adamson 360-357-2717
WSDOT Communications

Bill Elliott, 360-357-2735
WSDOT Project Engineer

SR 510 – Yelm Loop – New Alignment Phase 2 – Project Vicinity Map