Investigation revealed that a 2012 Peterbilt semi truck, being operated by Shannon Dwinell (46) of Great Bend, KS, was westbound on I-84 when for unknown reasons left the roadway, struck the guardrail, and overturned.
Dwinell sustained fatal injuries and was pronounced deceased at the scene.
The stock trailer was loaded with 28 cattle, 5 died as a result of the crash.
Oregon State Police and emergency personnel are on scene of a single vehicle semi truck crash on I-84 near milepost 284 westbound.
A commercial motor vehicle hauling cattle has struck a guardrail and flipped over on Interstate 84 - 2 miles west of North Powder.
The operator sustained fatal injuries and was pronounced deceased at the scene.
Several cattle escaped and are loose on the freeway, unfortunately several cattle also died in the crash.
Investigation is continuing no more information to be released at this time.