A 50-mile stretch of Highway 12 west of Naches and east of Packwood will remain closed a second night because of a washout discovered Tuesday morning, according to the state Department of Transportation (DOT).
An estimated reopening cannot yet be determined, the DOT said Wednesday afternoon.
The Highway 12 washout is about 4 miles east of the White Pass summit. After learning of the washout Tuesday morning, DOT crews closed the highway from the Oak Creek feeding station west of Naches, Yakima County, to the intersection with Highway 123 west of the summit.
An alternative route is available via Highway 410 and Highway 123. However, commercial traffic is prohibited from using the route, which crosses through Mount Rainier National Park.
As of Tuesday evening, erosion from the washout was still occurring and crews were struggling to determine a cause and assess the damage to the road, DOT assistant maintenance engineer Bill Preston told the Yakima Herald-Republic.