This article was updated July 18 with a new estimate from the Dunsmuir Fire Department of the amount of vegetation burned

A fire that started in the engine compartment of a commercial truck Sunday evening, July 16, on Interstate 5 spread to adjacent vegetation, burning 1.9 acres, according to information from Dunsmuir Fire Department Chief Dan Padilla.

The fire was reported at approximately 5:35 p.m. at north bound Interstate 5, just north of Exit 732 Siskiyou Ave., near the “Fox Farm” curve. It was in the Dunsmuir Fire Department’s jurisdiction, and they were assisted by Castella Fire Protection District, Mount Shasta City Fire Department, Mount Shasta Fire Protection District, USFS, CAL FIRE, and CHP.

According to Chief Padilla: The driver stated he noticed his engine begin to overheat as he started up the grade. He pulled to the right hand shoulder to let the engine cool. When he opened the hood, he saw flames coming from the engine compartment. He attempted to put out the fire with a portable fire extinguisher with no success.

The cause had not been determined as of Monday afternoon.

Chief Padilla said he believes the truck was transporting bottled drinking water, and it was not damaged by the fire, which only extended from the tractor to the vegetation and not to the trailer.

-- Note: This article was updated July 18 with a new estimate from the Dunsmuir Fire Department of the amount of vegetation burned, which was initially reported as less than a quarter acre.