SR 305 - Construction - Safety & Mobility Improvements

Project news

​Why roundabouts?

The centerpiece of the proposed improvements include roundabouts at several major intersections along the corridor. The proposed locations are: Johnson Road, Totten Road, Milepost 7.9 (Masi Shop/Sandy Hood Road), Adas Will Lane, Port Madison Road, and Day Road. Transit, bicycle and pedestrian improvements are also planned in conjunction with intersection improvements.

Due to a number of benefits, WSDOT currently has about 100 roundabouts on other state highways in Washington. These benefits include helping reduce the potential for crashes while keeping traffic moving. There are several reasons why roundabouts help reduce the likelihood and severity of collisions:

  • Low travel speeds – Drivers must slow down and yield to traffic before entering a roundabout. Speeds in the roundabout are typically between 15 and 20 miles per hour. The few collisions that occur in roundabouts are typically minor and cause few injuries since they occur at such low speeds.
  • No light to beat – Roundabouts are designed to promote a continuous flow of traffic. Drivers need only yield to traffic before entering a roundabout; if there is no traffic in the roundabout, drivers are not required to stop. Because traffic is constantly flowing through the intersection, drivers don't have the incentive to speed up to try and "beat the light," like they might at a traditional intersection.
  • One-way travel – Roads entering a roundabout are gently curved to direct drivers into the intersection and help them travel counterclockwise around the roundabout. The curved roads and one-way travel around the roundabout eliminate the possibility for T-bone and head-on collisions.

Why not widen SR 305?
The proposed improvements represent an incremental approach to improve mobility. This approach maximizes the capacity of current infrastructure.

What about the Agate Pass Bridge?
A WSDOT study (Type, Size, and Location) estimates a new 3-lane bridge could cost upwards of $122 million. While funding has not been identified, WSDOT will continue efforts to preserve this span through annual bridge cleaning. Beginning in spring 2019, crews also will repaint the entire bridge for the first time since 1991.

The End Result
Working with community partners, WSDOT is continuing the process to produce the final suite of improvements for the corridor.

Needs & benefits

  • Reduced potential for crashes.
  • Improved safety and better access to the corridor is crucial to ensure enhanced travel time, reliability and economic vitality.

The process initially began with an effort by the West Sound Alliance, which produced a report on Strategic Corridor Investments. Following the report, the Washington State Legislature funded the SR 305/ Winslow Ferry to Hostmark St. – Safety Improvements project. The 2015 Connecting Washington transportation package included $36.8 million for investments in the corridor. Kitsap Transit working with community partners followed with a study that has established a vision and goals for this corridor.


Preliminary design - winter 2019
Construction - (Johnson Road) spring 2020
Project completion - 2023


Financial Data for PIN N30500R
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $0
CWA $36,800
Total $36,800


Doug Adamson
WSDOT Communications

Michele Britton
Project Engineer

SR 305 – Winslow Ferry to Hostmark St – Safety Improvements – Project vicinity map