SR 510 - Yelm Loop - New Alignment Phase 2

Project news

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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 mid 2020. The in-depth process will involve an update of the Environmental Assessment completed for this project in 2000. 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 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.


  • Environmental reevaluation – Winter 2019 – Summer 2020
  • Project advertised for competitive bidding  – Summer 2021
  • Construction – Early 2022
  • Project completion – Late 2023


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


John Romero
WSDOT Project Office 

Doug Adamson
WSDOT Media Relations 

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