Summit County Sheriff Dave Edmunds said chances were good that the avalanche near Park City, about 20 miles east of Salt Lake City, trapped only one person.
Monday was the last day searchers would gather in large numbers. A limited search will continue, but bigger groups won't scale the mountain again unless authorities receive a credible tip that someone is missing.
''Right now, we believe that we have taken the one sole victim out of there,'' Edmunds said. ''There's been four solid days and there's just no reason to believe that there's more victims out there.''
Eyewitness accounts of Friday's slide initially led authorities to believe that as many as five people may have been caught in a debris field up to 30 feet deep in spots.
Police have cleared all but three names from a list of potential victims, ''but it's very probable they are not involved,'' Edmunds said. ''Some of these individuals have not contacted family for months.''
The body of one man, Shane Maixner, 27, of Sandpoint, Idaho, was recovered Sunday with the help of trained dogs, and rescuers sensed that the discovery of other clothing items meant more victims were nearby.
But Edmunds pulled back from that Monday, saying it's common during rescue efforts to find incidental items unrelated to a search.
The snow slide occurred in an out-of-bounds area near The Canyons resort that had been marked with skull and crossbones warning signs because of the avalanche danger.
Including Maixner, seven people have been killed in Utah avalanches so far this winter _ more than any other winter since the state started keeping records in 1951.
In northern Idaho, two snowboarders from Gonzaga University in Spokane, Wash., were killed in an avalanche Sunday while snowboarding south of Mullan, the Shoshone County sheriff's office said. A third snowboarder survived and walked to a nearby house to call for help, deputies said.
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