An interstate in Portland appeared icy at first glance Thursday evening, but Oregon Department of Transportation officials confirmed that the road wasn't covered with ice.

Instead, a drywall mud spill covered a stretch of Interstate 5 in Portland.

"What a mess," DOT wrote on Twitter, while posting photos of the white substance covering the road, and the cleanup process involved.

The drywall mud spill shut down traffic in the area for awhile, while crews worked to remove the substance and make the roadway safe for travel. Drivers were urged to avoid the area.

All lanes have since reopened.