The last contact Lucius Robbi of Orleans, California, had with his family was at about 2 p.m. Tuesday.
He was supposed to attend orientation at the school on Wednesday but never arrived.
He's driving a green 1979 Subaru Legacy with California plates and one or two kayaks on top.
It's unclear which route Robbi might have chosen to drive to Montana.
Robbi, a native of Twisp, Washington, was working at a local rafting company in Idaho.
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