Drivers on Vashon Island should rebuild north-south routes as early as August 18, 2026. King County expects to close Judd Creek Bridge #3184 on Vashon Highway SW for up to six weeks of deck resurfacing, with the corridor shut 24 hours a day in both directions.
The bridge sits just north of Burton on the island’s busiest road. About 4,700 vehicles use it each day, and the official detour will also apply to pedestrians, bicyclists, and emergency responders while crews replace the worn deck with polyester polymer concrete.
- Start window: Construction expected as early as August 18, 2026, for up to six weeks.
- What closes: Judd Creek Bridge on Vashon Highway SW, both directions, 24/7.
- Limits: Vehicles, pedestrians, bikes, and emergency units all use the signed detour.
- Why now: Cracked, potholed deck needs a polymer overlay before rebar damage worsens.
- Cost: About $1.6 million, funded mainly by a Federal Local Bridge grant.
What King County confirmed for August 18
On its Judd Creek Bridge #3184 project page, King County posted an August 12, 2026 status update that construction should begin as early as August 18 and last up to six weeks. Vashon Highway SW at the bridge will stay closed around the clock while work runs.
The closed segment runs between SW Quartermaster Drive and SW 228th Street. County engineers say the span is too narrow to keep a live traffic lane beside heavy equipment, so partial lane closures are not on the table.
An earlier King County Road Alert had flagged a possible August 17 start. The later project-page update is the clearer current schedule travelers should use when they rebuild island drives this week.
Local coverage such as the Vashon-Maury Island Beachcomber’s six-week resurfacing report has tracked the same full-closure plan through the summer planning window. Treat the official King County page as the live authority for start day and daily status.
Why the bridge cannot stay open during the work
Judd Creek Bridge is 370 feet long and 30 feet wide including the sidewalk. Crews plan to grind roughly the top half inch of the existing deck, including an older epoxy overlay, repair deeper spalling, and place about 1.5 inches of polyester polymer concrete.
County materials describe a 72-year-old concrete deck that is cracked, prone to large potholes, and nearly worn down to steel rebar in places. Water seeping through cracks is rusting the steel and causing the deck to spall further.
If the overlay is delayed, deterioration can reach the rebar and force a full deck replacement. Officials put that larger job above $40 million and say it would take far longer than a six-week resurfacing window.
The new polyester polymer concrete layer is expected to last at least 30 years. It replaces cement with a polyester resin binder, cures faster than traditional deck systems, and is meant to seal water out of the deck structure.
How the signed detour works for island trips
All travelers, including people on foot or bike, must follow the marked detour using SW 204th Street, 111th Avenue SW, SW 220th Street, Old Mill Road SW, SW 232nd Street, and SW 228th Street. The path is designed to reconnect the same north-south island movement that Vashon Highway SW normally carries.
Plan for extra minutes even when traffic looks light. The highway is the island’s main spine, so the detour will absorb the same daily volume that used to cross Judd Creek in a straight line.
Ferry arrivals that feed car traffic onto Vashon can stack at the same hours as school, work, and errand peaks. If you are connecting a mainland Seattle day with an island stay, leave more curb-to-curb time than a normal island map suggests.
Visitors combining Vashon with a Seattle base can still use Deep Arrival’s guide to things to do in Seattle for city days, then treat the island drive as a separate timing problem once the bridge closes. Do not assume a same-day city-plus-island loop still fits a tight ferry return.
Emergency access, school calendars, and summer timing
The entire bridge closes to emergency response vehicles as well as ordinary traffic. Fire, sheriff, and other responders must use the detour.
County communications staff say responders will keep updated maps, but residents should still expect longer response paths during the window.
King County’s goal is to avoid overlapping the work with the school year. Officials note that material availability, crew scheduling, and weather can still shift the start or stretch the finish into fall.
Summer is required for the chosen material. Polyester polymer overlays are highly weather dependent, and warmer, drier conditions help the mix cure faster, which shortens the total closure compared with cooler seasons.
Travelers who only visit Vashon on weekends should still recheck the project page the morning of departure. A delayed start or weather hold can move the first closed day by hours or days without changing the underlying six-week plan.
What this means for ferry, cruise, and regional plans
Vashon is not a cruise homeport, but many regional itineraries pair Seattle waterfront days with island side trips. Guests who book a Seattle embarkation can review Deep Arrival’s Seattle cruise port embarkation guide for terminal timing, then add the Judd Creek detour only if their pre-cruise or post-cruise plan includes a Vashon drive.
If your trip is a broader Washington loop toward the Olympics, keep the island detour separate from mountain-day logistics. Deep Arrival’s Olympic National Park guide remains useful for park access, while the Judd Creek closure only changes the Vashon Highway SW segment itself.
Delivery vans, contractors, and short-term rental guests should treat the six-week window as a hard route change, not a minor construction squeeze. GPS apps may still suggest Vashon Highway SW until they ingest the full closure, so print or screenshot the signed detour streets before you leave the ferry lane.
Businesses south of the bridge toward Burton and points beyond should expect customers to arrive later and leave earlier while the detour is the only legal path. Northbound island returns toward the ferries can bottleneck when evening ferry banks and the detour meet.
How to verify the live start day before you drive
Use the King County project page and MyCommute map as the first check on the morning you travel. The August 18 date is the anticipated start, not a guarantee that cones appear at midnight if crews or weather slip.
The earlier Road Alert’s August 17 language shows how start messaging can move. When official pages disagree by a day, prefer the newest dated status block on the project site and confirm with the live map layer.
If you manage a guest rental or a multi-car family trip, assign one person to recheck status the night before and again before the first ferry. A single stale group text is how island visitors still aim for a closed bridge.
Keep a low-data offline note with the detour street list. Cell coverage can dip in tree-lined segments, and the signed route is simpler to follow when everyone in the car already knows the sequence of turns.
| If you… | What to do |
|---|---|
| Drive Vashon Highway SW from August 18 onward | Avoid Judd Creek Bridge and follow the signed SW 204th Street detour path. |
| Have a same-day Seattle-plus-Vashon plan | Add ferry and detour buffer; do not count on a straight island spine. |
| Need emergency or medical access south of the bridge | Assume responders also use the detour and allow more travel time. |
| Host guests or manage deliveries on the island | Send the detour street list before arrival and recheck the project page that morning. |
| Travel after the six-week window | Confirm reopening on King County channels before restoring old shortcuts. |
- Rebuild the route: Replace Vashon Highway SW at Judd Creek with the signed six-street detour for up to six weeks.
- Pad ferry days: Leave extra time between ferry arrivals and any south-island appointment.
- Recheck start day: Confirm August 18 on the project page the morning you drive.
- Share the map: Give guests and delivery drivers the detour streets before they leave the dock.
- Watch school timing: County staff aim to avoid school overlap, but weather can still push the finish later.
Treat August 18 as the working start and the official detour as the only legal path while the deck is open. Recheck King County status before each island drive until the project page reports the bridge fully reopened.
When does Judd Creek Bridge close on Vashon Island?
King County’s August 12, 2026 status update expects construction to begin as early as August 18, 2026, with a closure lasting up to six weeks.
Is any traffic allowed across the bridge during construction?
No. Both directions close 24/7 to vehicles, pedestrians, bicyclists, and emergency response units while crews resurface the deck.
What detour should drivers follow?
Use the signed route on SW 204th Street, 111th Avenue SW, SW 220th Street, Old Mill Road SW, SW 232nd Street, and SW 228th Street.
Why is a full closure required instead of one lane?
County engineers say the bridge is too narrow to keep a safe travel lane open beside construction equipment and crews.
How long should the new deck surface last?
King County expects the polyester polymer concrete overlay repairs to last at least 30 years.
