A single-engine Socata TBM700 plane crashed into Ridgway Reservoir in Ouray County on Saturday afternoon, authorities said. Authorities believe there are no survivors.

Ouray County spokeswoman Marti Whitmore says five people were believed aboard the plane, headed from Bartlesville, Okla., to Montrose, about 180 miles southwest of Denver and 50 miles north of the reservoir.

Federal Aviation Administration spokesman Ian Gregor says it crashed south of Montrose, just before 2 p.m. Saturday. He said he didn’t know the cause of the accident.

Whitmore said search and rescue operations were suspended Saturday night, but no victims have been recovered. No identities have been released.

She said the aircraft crashed in 60 to 90 feet of water.

The plane is registered to an Alabama corporation. Messages left for the company Saturday evening weren’t returned.

Whitmore said recovery work will continue Sunday.

The reservoir is within the Ridgway State Park, referred to as the “Switzerland of America” on the park’s website. The park is 15 miles from Ouray.

Park rangers and other staff members were assisting, said Randy Hampton, spokesman for Colorado Parks and Wildlife.

Denver Post staff writer Kirk Mitchell contributed to this article.