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A landslide is blocking all lanes heading west on State Route 20 (SR 20) in Newhalem, according to the Washington State Department of Transportation (WSDOT).

UPDATE 1:10am: WB SR 20 just east of (MP 121) remains blocked after a landslide. Our maintenance crews are plowing the EB lane so that EB & WB SR 20 traffic can alternate. We will re-evaluate in the morning.

Please continue to use caution if you’re in the area.

— WSDOT North (@wsdot_north)

WSDOT maintenance crews said the slide happened at approximately 12 a.m. Traffic in both directions is currently alternating using the eastbound lanes until the westbound lanes are cleared.

Crews will re-evaluate sometime later Monday morning, as there is no timetable for when the westbound lanes will reopen, as of this reporting.

UPDATE 12:45am: WB SR 20 just east of (MP 121) is blocked by a landslide. Part of the EB SR 20 lane is also partially blocked.

Our maintenance teams are on scene. Please use caution if passing through the area.

— WSDOT North (@wsdot_north)

This is a developing story, check back for updates