One lane of SR 18 blocked after semi-truck, motorcycle collision near Tiger Mountain
Aug 14, 2026, 9:15 AM | Updated: 9:24 am
A photo of a road closed sign. (Photo courtesy of KIRO 7)
(Photo courtesy of KIRO 7)
All westbound lanes of SR 18 near Tiger Mountain have reopened after a semi-truck and motorcycle collision. The left lane of eastbound SR 18 has been reopened, though the right lane remains blocked.
UPDATE 2: All westbound lanes of SR 18 just west of Tiger Mountain Summit have reopened. The left lane of eastbound SR 18 has also reopened while the right lane remains blocked.
Reminder: Issaquah-Hobart Road Southeast and city streets are not suitable for freight traffic. https://t.co/2YRp8JPGYs
— WSDOT Traffic (@wsdot_traffic) August 14, 2026
The collision occurred at approximately 8:55 a.m., the Washington State Department of Transportation (WSDOT) announced.
Washington State Patrol (WSP) Trooper Rick Johnson noted that the motorcyclist has serious injuries. Witnesses of the collision explained that the semi-truck forced the motorcycle into the barrier.
UPDATE: Both directions of SR 18 just west of Tiger Mountain Summit (MP 23) are blocked due to a collision.
Emergency crews are on scene. Expect delays.
Please note: Issaquah-Hobart Road Southeast and city streets are not suitable for freight traffic. https://t.co/lTaQJ4lO7y pic.twitter.com/p9TKthReF2
— WSDOT Traffic (@wsdot_traffic) August 14, 2026
Emergency crews are currently on the scene, and lengthy delays are expected.
WSDOT noted that Issaquah-Hobart Road S.E. and city streets are not suitable for freight traffic.
This is a developing story, check back for updates.
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