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 in the process of a federally required environmental assessment phase that will continue into fall 2021. The in-depth process will involve an update of the Environmental Assessment which will be completed in 2021. Efforts will produce a detailed environmental document called a Supplemental Environmental Assessment.

The End Result 
In this project, crews will build the 3 remaining miles of SR 510 between Cullens Road and SR 507. 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.


  • Environmental reevaluation – Winter 2019 – Spring 2022
  • Project advertised for competitive bidding – Early 2023
  • Construction – Summer 2023
  • Project completion – Early Fall 2025


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 $58,658
Total $58,658


Bill Elliott
WSDOT Project Design Engineer

Doug Adamson
WSDOT Media Relations 

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