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Search and rescue crews were looking for a 63-year-old woman who went missing after her raft overturned on the Green River in Dinosaur National Monument on Friday.

A commercial company was guiding the raft when it flipped at Disaster Falls in the Canyon of Lodore about 5 p.m., a news release from the National Park Service said. All occupants, aside from the woman, made it safely to shore.

The trip leader notified monument officials of the incident by satellite phone, the release said. Strong currents, meanwhile, had pinned the raft to a rock in the river.

A helicopter and multiple law-enforcement agencies responded to help search Friday night until it was too dark to continue. A search and rescue team was headed to the scene Saturday morning.

Disaster Falls has an intermediate to advanced class III-IV rating, depending on river levels, according to the International Scale of River Difficulty. The National Park Service release said it is in a remote section of the Canyon of Lodore, about 7 miles from the river launch at the Gates of Lodore.

The Green River was flowing at approximately 8,600 cubic feet per second at the time of the incident, the release said.

The name of the missing person is being withheld until the family has been notified. Further details were not immediately available Saturday, due the remoteness of the area and "spotty" reception even for satellite phones, said Dinosaur National Monument spokesman Dan Johnson.

Twitter: @mnoblenews