Maybe
Timothy S. McCarty? Originally from Polk, OH, was last seen in Castro (Valley?), California June 3, 1981.
A blog post claiming to be from a family member says that Timothy ran away from home following getting caught using marijuana with his friends. He went to California, where he contacted his aunt to stay overnight and for money. He fled his aunt's house the middle of the night since a family friend who was a cop came over the night he was staying over.
If he was trying to get back to Ohio from California it's reasonable to say he could have been traveling through Utah. Maybe he was afraid to go home, hence what happened to him.
Picture below seems like it was taken during high school, so a few years prior to his disappearance. I could see him possibly growing a mustache and sideburns in the time being.
Vital statistics also match:
Sex:
Male
Race:
White/Caucasian
Age:
21
Height:
5' 5" - 5' 8" (65 - 68 Inches)
Weight: 125 - 130 lbs
Hair Color: Brown (would turn lighter in the summertime)
Eye Color:
Green
Scar/mark: Light scar on upper part of lip
No mention of scar on upper lip but maybe it was covered by the mustache?