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
A family dog was 'best man' as he stood by a wounded veteran's side when he married his school sweetheart.
Mild and muggy - with more rain.
After six years of cuts to local authority budgets, the money simply isn't there to fund every request for adult social care.