Spokeswoman Summer Derry in Yakima said drivers will be directed through the washout area by portable lights and should expect periodic closures as work continues.
A contractor hopes to restore two lanes of travel before winter. A permanent repair will have to wait until spring.
After heavy weekend rain, a 500-foot section along the highway gave way Tuesday three miles east of the White Pass summit. A 45-mile stretch of highway between Packwood and Naches was closed.
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