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A fire broke out on a semi-trailer rig Thursday morning, closing down U.S. 6 through Spanish Fork Canyon.

Utah Highway Patrol gt. Todd Royce said the driver — who was unhurt — was able to detach the semi cab from its trailer, but flames completely destroyed the big rig's load of paper products.

As of 7:30 a.m., about three hours after the westbound semi caught fire, one lane of the highway had been reopened at the scene. Traffic flow resumed one-way, with vehicles alternating east and west travel through the area of mile post 192.

The scene should be cleared and normal traffic flow restored by 9:15 a.m., though there were concerns the blaze may have damaged the road surface.

Flames also damaged some nearby power lines, prompting Rocky Mountain Power to dispatch repair crews to the scene.

The cause of the fire remained under investigation.

Twitter: @remims