SEARSPORT, Maine — A single-car crash on Route 1 near downtown Searsport killed a woman and sent three people to the hospital.

A four-door sedan driven by Robert Cassatt, 81, of Brooksville crashed into a tree at about 3:30 p.m. next to the Bayview Manor residential care community.

William Gregor, 66, and Grace Gregor, 64, both of Brooksville, were taken along with Cassatt to Waldo County General Hospital in Belfast. Eve Cassatt, 80, was flown by LifeFlight to Eastern Maine Medical Center where she later died.

Robert Cassatt and the Gregors were reported to be in good condition Thursday evening.

A woman watching rescue crews work after the injured passengers had been taken to the hospital said she was Robert Cassatt’s daughter. The Brooksville man suffers from Parkinson’s disease, Lydia Cassatt said. Lydia Cassatt said Eve Cassatt was her stepmother.

Before heading for the hospital, Cassatt, of Brooksville, said that her father and stepmother had been returning from taking their boat to Camden for the winter.

Traffic on the busy artery was “a nightmare” said Searsport police Officer Jessica Danielson. All traffic into and out of Searsport from the south was being rerouted, she said.

“I will get Route 1 opened up as soon as I can,” she said.

At 5 p.m. vehicles were backed up nearly a mile on the Back Searsport Road headed toward Belfast.

The accident remains under investigation, Danielson said.

Searsport, Belfast and Stockton Springs rescue crews assisted at the scene.