SR 166 - Bay Street / Bethel Avenue / Maple Avenue Intersection Pre-Design Study

SR 166 Bethel E. Bay Streets and Maple Avenue Pre-Design Study mapStudy News

WSDOT has completed the SR 166 Bay Street / Bethel Avenue / Maple Avenue Intersection Pre-Design Study and the report (pdf 1.3 mb) is now available for viewing.

Study Purpose

WSDOT is conducting a pre-design study of the intersection of SR 166 and Bay Street, Bethel Avenue and Maple Street in Port Orchard as the existing traffic signal at this intersection has reached the end of its useful life. This in-depth review has included collaboration with local business owners, City of Port Orchard, Kitsap County, Kitsap Transit, Port Gamble S'Klallam Tribe, the Suquamish Tribe, and the Washington Department of Fish and Wildlife.

Following this collaborative process that involved research and analysis, WSDOT proposes to replace the existing traffic signal with a modern single-lane roundabout.

Roundabout Benefits

Roundabouts are safer than traditional traffic signals or stop sign controlled intersections, and they accommodate vehicles of various sizes, including emergency vehicles, buses, semi-trucks with trailers, farm and logging equipment. Studies show roundabouts reduce injury crashes by 75% at intersections where stop signs or traffic signals previously existed. Roundabouts improve the flow of traffic because users don't have to wait for a green light to get through the intersection. Other benefits of a roundabout include vehicles moving in the same direction which helps improve traffic flow. Roundabouts reduce maintenance and repair costs when compared to traffic signals.

Community Input

The comment period has ended. Thank you for submitting comments about the SR 166 and Bay Street, Bethel Avenue and Maple Street intersection proposed roundabout. A summary of the comments we received will be included in the study report. Design visualizations displays, which are graphical representations of the proposed modern roundabout, are available for viewing. 

End Result

WSDOT will publish a report at the conclusion of the study that will aid in the upcoming project design work scheduled for the fall of 2020. 


  • Pre-Design Study - December 2019 to summer 2020
  • Project Design - fall 2020 
  • Anticipate Project Construction - summer 2022


Dennis Engel, Multimodal Planning Manager

Yvette Liufau, Study Lead

Doug Adamson, Media Relations