Takes a lot of time going through guide school and doing check outs. There's not really an interview. They analyze the way you act among others during guide school and how you handle certain situations. Basically don't suck and don't be a jerk.
Whitewater Raft Guide applicants have rated the interview process at USNWC with 2 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 70.4% positive. This is according to Glassdoor user ratings.
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