An Alaska State Troopers spokesman told Sky News Steve Morton, who is reported to have died following a white-water rafting accident, was on a trip arranged with NOVA River Runners.
The company described the risks of the route on their website, saying the risk of injury to swimmers was "moderate to high", whilst water conditions "may make self-rescue difficult."
It added that the route could include "obstructed or very violent rapids which could expose a participant to above average endangerment."
More top news
Robert Moore believes Donald Trump lost his way during the first head-to-head presidential debate with Hillary Clinton.
Police excavating a site on the Greek island of Kos say they have found pieces of fabric in their search for Ben Needham.
Donald Trump and Hillary Clinton have clashed in a fiery first presidential debate in the race for the White House.