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."
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A rather cloudy morning will clear to sunny intervals and showers this afternoon.