The National Park Service said low water levels at the Echo Bay boat ramp launch have prompted the closure announcement.
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Family members of the couple, who went missing March 27, said on social media they had been found but one had died.
Meanwhile, in Clark County, there were 418 new cases reported Sunday, for a total of 61,237, according to the Southern Nevada Health District.
A person wanted in a domestic violence disturbance who had barricaded in a residence in the southwest Las Vegas Valley has been taken into custody, police said.