By Emma Breysse

Wyoming Highway Patrol is investigating a semi-truck wreck that left Teton Pass dusted with powder Monday evening. 

The truck crashed through a guard rail while heading east down the pass toward Wilson. The cargo of what those at the scene said was talcum powder spilled all over the area.

The driver was responsive and apparently unhurt at the scene. The truck was virtually destroyed, as was that section of the guard rail, observers said.

As of Monday night, troopers had not released information on why the driver went off the road. The crash slowed traffic for more than an hour following the crash, which happened just after 7 p.m.