Early Wednesday, June 17, Eastside Fire & Rescue said it responded to a collision between a motorcycle and a semi-truck on westbound State Route 18 at milepost 25. The agency described the crash as a fatality and said both westbound lanes were closed while emergency crews worked the scene. Washington State Patrol's public information office was cited as the source for forthcoming updates on the investigation and roadway reopening.
EF&R is responding to a motorcycle and semi-truck collision on WB18 at MP25. Both lanes are closed at this time. Tragically, this is a fatality incident. @wspd2pio will have updates on the investigation and closure. https://x.com/i/status/2067050545769320570
— Eastside Fire & Rescue (@eastsidefire) June 17, 2026
Officials and response
According to Eastside Fire & Rescue, crews were on scene and both westbound lanes were closed at MP 25 after a collision between a motorcycle and a commercial semi. The agency characterized the incident as a fatality and indicated that the Washington State Patrol public information office will have updates about the investigation and the closure. No further details about victims or the commercial vehicle were released in the initial post.
Traffic impact and corridor context
The closure at milepost 25 affects the primary westbound corridor over Tiger Mountain and is likely to produce significant backups, so motorists should expect delays and seek alternate routes where possible. WSDOT has been widening and reconfiguring the route to improve flow and safety, and real-time updates are available on the agency's travel map at WSDOT. A similar fatal collision closed SR 18 in late May, as reported in a similar fatal crash in May, underscoring how disruptive crashes can be on this stretch.
How to get updates
Authorities say the Washington State Patrol's public information account will post official details; check the Washington State Patrol for updates on the investigation and reopening timeline. This story will be updated as officials release more information.
