The NorthCascade Highway was covered by eight different slides Saturday night according to the Department of Transportation.
The DOT said Sunday afternoon that the road will remain closed indefintely due to incoming storms and the slides.
More photos from WSDOT of mudslides
SR 20 is closed between milepost 147, the winter gate closure, to milepost 157, Rainy Pass and the Chelan County Line.
DOT crews are working to clear the road.
State Route 20 is the northernmost route across the Cascade Mountain Range.