The trooper, 14-year-veteran Sgt. Chris Dunn was struck by the driver of a utility truck who was reportedly distracted. The truck hit Sgt. Dunn as he was either getting into his patrol car or reaching into his patrol car while having his left hand on his car. The trooper's hand was severed.
He was flown to the University of Utah hospital and underwent surgery to reattach his hand.
The original crash involving a van and a semi truck happened on Interstate 80 and Lamb's Canyon.
A medical helicopter was dispatched to transport one of the people involved in the crash to a local hospital.
Both crashes forced the closure of I-80 for more than an hour so that the helicopters could land, and so that investigators could collect data and evidence at the scene.
The closure caused some travelers to wait more than three hours to pass through the canyon.
The cause of the crash was under investigation.
Stay tuned to ABC 4 News and ABC4.com for more on this story.