If you drive SR-3 between Belfair and Bremerton, 2026 is going to test your patience. Three overlapping infrastructure projects — a 16-day full road closure near Gorst, a new roundabout at the SR-3/SR-16 Spur intersection, and the politically uncertain Belfair Bypass — will reshape how North Mason residents get to PSNS, Bangor, and everywhere south of Gorst. Here’s what’s actually happening, when, and what it means for your daily drive.
The 16-Day SR-3 Closure: Fish Barrier Removal Near Gorst
WSDOT’s fish barrier removal project on SR-3, SR-16, and SR-166 near Gorst will require a complete closure of SR-3 for up to 16 consecutive days during summer 2026. Crews will remove a section of the highway near Sunnyslope Road Southwest and install a new 150-foot-long box culvert to restore fish passage.
This is not a lane restriction. This is a full road closure — no through traffic on SR-3 at that location for over two weeks.
Early work starts in April 2026 with nighttime lane closures at two locations for utility relocations and limited vegetation removal. The 16-day closure itself is scheduled for summer, though WSDOT has not yet locked the exact dates.
Detour Routes During the SR-3 Closure
WSDOT has published three signed detour routes:
- Passenger vehicles: Sunnyslope Road Southwest to Southwest Lake Flora Road
- Pedestrians, cyclists, and those who roll: Northeast Old Belfair Highway to West Belfair Valley Road
- Commercial vehicles: SR-16 to SR-302 (a significantly longer route)
For PSNS commuters leaving Belfair at 6 AM, the Sunnyslope/Lake Flora detour adds approximately 15-25 minutes depending on traffic volume. During shift changes — particularly the 7 AM gate surge — expect these detour roads to carry far more traffic than they were designed for.
The New Gorst Roundabout
As part of the same project, WSDOT will construct a new roundabout at the intersection of SR-3, SR-16 Spur, and West Sam Christopherson Avenue. This intersection has been an accident cluster point for decades, and the roundabout is designed to reduce collision potential and improve traffic flow.
For daily commuters, the roundabout should eventually smooth the stop-and-go pattern that defines Gorst. But during construction, expect lane shifts, temporary signals, and reduced speeds through the area.
The Belfair Bypass: Delayed or Dead?
The SR-3 Freight Corridor — commonly known as the Belfair Bypass — was a 6-mile new alignment designed to route regional through-traffic around Belfair’s commercial corridor rather than through it. The Federal Highway Administration issued a Finding of No Significant Impact (FONSI) in November 2024, and construction was originally planned to begin in spring 2026 with completion by 2028.
Then Governor Bob Ferguson’s proposed transportation budget pushed the project’s funding to the 2031-33 biennium. As reported by the Mason County Journal in February 2026, this delay could push the bypass back by five years or more.
For North Mason commuters, this means the Belfair commercial corridor — SR-3 through town — remains the only route. The 18,000+ daily vehicle count through Belfair’s main stretch will continue growing without relief.
What This Means for Your Daily Drive
If you commute from Belfair to PSNS or Bangor:
- Plan now for the 16-day closure. If your shift schedule allows flexibility, consider adjusting during the closure window. Carpooling through the detour reduces vehicle volume on roads not built for this traffic.
- The Sunnyslope/Lake Flora detour is narrow. These are rural roads. Two large trucks passing in opposite directions will slow everything down.
- Gorst roundabout construction will overlap. Even after the 16-day closure ends, expect reduced capacity through Gorst for months as the roundabout is built.
- The Belfair Bypass is not coming soon. Don’t make housing or commute decisions based on the bypass being operational by 2028. The current political reality suggests 2033 at the earliest.
Related Belfair Bugle Coverage
For more context on commuting from North Mason, see our complete guide to commuting from Belfair to PSNS, our military families in Belfair guide, and the latest commuter alert.
Frequently Asked Questions
When exactly will SR-3 be fully closed near Gorst in 2026?
WSDOT has confirmed the closure will last up to 16 consecutive days during summer 2026. Early utility work begins in April 2026 with nighttime lane closures. The exact summer closure dates have not been finalized — check WSDOT’s SR-3 project page for updates.
What is the best detour route from Belfair to PSNS during the SR-3 closure?
For passenger vehicles, WSDOT’s signed detour uses Sunnyslope Road Southwest to Southwest Lake Flora Road. This adds approximately 15-25 minutes to a typical Belfair-to-Bremerton commute depending on traffic volume during the closure.
Is the Belfair Bypass still being built in 2026?
The SR-3 Freight Corridor (Belfair Bypass) received federal environmental approval in November 2024, but Governor Ferguson’s proposed transportation budget delays construction funding to the 2031-33 biennium. Construction originally planned for spring 2026 is now unlikely before 2033.
Will the new Gorst roundabout help PSNS commuters from Belfair?
Yes, long-term. The roundabout at SR-3, SR-16 Spur, and West Sam Christopherson Avenue replaces a collision-prone intersection. Once completed, it should reduce stop-and-go delays through Gorst. During construction, expect temporary lane shifts and reduced speeds.
How many vehicles use SR-3 through Belfair daily?
SR-3 through Belfair’s commercial corridor carries more than 18,000 vehicles per day. Without the Belfair Bypass, this volume will continue increasing as the North Mason population grows.
What is the Gorst fish barrier removal project?
WSDOT is removing fish passage barriers on SR-3, SR-16, and SR-166 near Gorst. The project includes installing a 150-foot-long box culvert on SR-3 near Sunnyslope Road Southwest, which requires the 16-day full road closure, plus building a new roundabout to improve safety.
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