Upper State Route 504 closed at milepost 45.2 due to large slide

Closure: Upper State Route 504/Spirit Lake Memorial Highway is closed between mileposts (MP) 45.2 and 51 until further notice with a possible re-opening date sometime in 2026. Johnston Ridge Observatory and Loowit Viewpoint is inaccessible by vehicle and the facility is closed to the public. View the South Coldwater Slide Information & Updates page for current updates. The road is blocked just outside the Hummocks Trailhead at the normal winter closure gate.You may access the South Coldwater Trail #207A on foot approximately one mile beyond the gate. You may also hike the Hummocks Trail to Boundary to access the Loowit Viewpoint and Johnston Ridge. Please contact Mount St. Helens National Volcanic Monument for more information at 360-449-7800, extension 0 to reach the front desk.

What's Open: Coldwater Science & Learning Center, Coldwater Lake Day Use and Hummocks Trail. Learn more.

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