Road Alert Reminder: Upcoming Road Closure for Fifteen Mile Creek Bridge Replacement Project

King County, Washington sent this bulletin at 06/12/2026 09:37 AM PDT

Fifteen Mile Creek Bridge #493C on SE May Valley Rd between Issaquah-Hobart Rd SE and 233rd Ave SE

Reminder: Upcoming Full Road Closure near Issaquah

The Fifteen Mile Creek Bridge #493C Bridge Replacement Project will take up to 12 weeks to complete, including a 10-week full closure of the bridge starting this Monday, June 15, 2026.

Beginning at 7 am this Monday, June 15, 2026, SE May Valley Road between Issaquah-Hobart Road SE and 233rd Avenue SE will be closed in both directions, 24/7, to all travelers, including emergency services, through 11:59 pm on August 23, 2026. All travelers will follow the marked detour route.

This work may be delayed due to machine, crew, or equipment availability or weather.

Update from Eastside Fire & Rescue about Response Times:
King County Road Services Division has been working closely with Eastside Fire & Rescue, Bellevue Fire, Puget Sound Regional Fire Authority, and the Renton Regional Fire Authority. The Eastside Fire & Rescue deputy chief of operations has asked us to reassure community members near the bridge and in the Mirrormont community that they do not expect any change to emergency response times and that their coverage remains strong. Even with the bridge closed, King County has been told three other stations in the Issaquah area are positioned to reach nearby neighborhoods quickly.

Eastside Fire & Rescue also shared that, before Station 78 opened in 2016, Station 71 was the primary responding engine for the Mirrormont community. Throughout the SE May Valley Road closure, TriMed Ambulance will post an additional unit at Station 71 each day from 6 am to 8 pm. During this period, TriMed will handle transports for the area, which will help keep more Eastside Fire & Rescue units available to serve the community.

For major incidents, the regional system will continue to automatically dispatch the closest available units, including support from their partners in Puget Sound Fire. That coordinated response model will not change during the closure.

In addition, Station 76 within Mirrormont will host the Washington State Department of Natural Resources wildland crews this summer, providing extra seasonal coverage and helping reduce concerns about wildfire response.

Additional Information:

To learn more about this project, visit the project website: https://KingCounty.gov/15MileCreek

For the most up-to-date travel information, visit MyCommute: KingCounty.gov/MyCommute

*FREIGHT ALERT: Issaquah-Hobart Road SE and Issaquah city streets are not suitable for freight traffic. Trucks should use the alternate routes shown on the project website.

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Information concerning state and some city routes is provided by non-King County agencies and included for the convenience of the public. If it is critical that you have more current information about the status of a road or a service request, please call 206-477-8100 or 800-527-6237. In major events, phone lines will be very busy and your patience is requested. Please do not e-mail for emergency road status information.

Please note that short-term road closures related to traffic collisions or utility work such as down powerlines are not reported via Road Alerts or My Commute as those closures are managed by outside agencies. During normal working hours, King County will attempt to post closure information of this type on our X (Twitter) account.

DISCLAIMER: King County Road Services provides Road Alerts as a service to the public. While we try to provide accurate and timely information, estimates of the nature and duration of closures are subject to variables such as weather and traffic conditions that are beyond the control of King County and, therefore, difficult to predict. People relying on this information should do so at their own risk. Neither King County nor its employees or agents shall be liable for the accuracy of this information, or any actions taken as a result.

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