05/31/2026
Traffic Alert: SE May Valley Road Closure Begins June 15
Families who travel through May Valley, Mirrormont, Tiger Mountain, or the Issaquah-Hobart area should plan for significant traffic impacts this summer.
King County will replace the aging Fifteen Mile Creek Bridge on SE May Valley Road, resulting in lane restrictions and a full road closure that will affect local traffic and some school bus routes.
Important Dates
🚧 Beginning June 2
• Temporary lane restrictions may begin.
• School buses and emergency vehicles will be prioritized whenever possible.
🚧 Beginning June 15
• SE May Valley Road will fully close at the bridge location.
• No vehicle, bicycle, or pedestrian access will be available through the construction zone.
🚧 Projected Reopening
• August 23, 2026
• Construction is expected to last 10–12 weeks and could extend into the start of the 2026-27 school year.
Who Will Be Affected?
This closure will primarily impact families attending:
Maple Hills Elementary
Maywood Middle School
Liberty High School
Families who live in or travel through May Valley, Mirrormont, Tiger Mountain, and surrounding areas should expect longer travel times and increased traffic on detour routes.
School Bus Information
The Issaquah School District Transportation Department is actively planning for the closure.
• Bus stop locations will remain the same.
• Families on affected routes will receive updated bus schedules in early June.
• Morning pickup times may be earlier to ensure students arrive at school on time.
• Afternoon drop-off times may be later due to detours and traffic.
What You Can Do Now
✔ Review the detour route.
✔ Practice your alternate route before June 15.
✔ Allow extra travel time for drop-off and pickup.
✔ Watch for transportation updates from the district.
Stay Informed
For project details, detour maps, and construction updates, visit the King County project website and monitor MyCommute for the latest travel information.
You can also visit MyCommute for the latest travel information.
Thank you for your patience as King County completes this important infrastructure project.
An upcoming road closure will affect routes to and from school for some families and staff members in the South End of the district, and for those who commute through the area. King County’s Road Services Division will fully close Southeast May Valley Road at Fifteen Mile Creek Bridge for bridge r...