Reserve a Trip: Moose River Spring Trip Minimum Age 18. Moose River Spring trips are the double Black Diamonds of rafting. Be sure you know what you are getting into before booking. That being said, our guides LOVE the Moose. Date Number of Guests View Results Find Trips Trips No upcoming trips were found. Try our general trip search page, which may show more results. Or call us, 800-525-7238, we are happy to help find the right trip for your needs!