Update 8:10 a.m. - Crews have uprighted the semi that overturned Thursday morning along I-40 & Garth Brooks Boulevard.
The accident happened just before 4:30 a.m. when the driver says a motorist slammed on their brakes in front of the semi causing the semi to roll into a ditch.
The semi driver suffered a minor head injury and was treated on the scene.
OHP troopers have closed one westbound lane while they try to move the semi out of the ditch.
Yukon firefighters are assisting OHP with the investigation.