The semi lay on its side in the ditch about 20 kilometres west of Indian head.
Westbound traffic was down to one lane during the afternoon while people cleared the contents from the side of the road and placed them into another vehicle. The truck was carrying boxes, apparently with paper inside.
Eastbound traffic was unaffected.
RCMP did not say whether there were any injuries in the crash. Witnesses saw only the single semi in the ditch Sunday afternoon.