The Salt Lake City Police Department says 25-year-old Robin Putnam is considered to be a missing and endangered adult.
Police say that according to family members, Putnam was traveling from Oakland to Grand Junction by Amtrak train earlier in the week, and that while his belongings arrived in Colorado, the family believes he got off the train during a stopover in Salt Lake City at 3 a.m. on Sunday.
Putnam was described as 6 feet 1 inch tall, 140 lbs., blue eyes, blond hair and possibly wearing glasses.
Police say Putnam is considered a missing and endangered adult due to mental health issues.
Anyone with information as to the whereabouts of Putnam was asked to call (801) 799-3000.