FAIRFIELD – A motorcyclist from Aurora was listed in critical condition at a Portland hospital Saturday after a crash that occurred on Interstate 95 south, near Exit 132.

Kenneth Stillwell, 51, suffered at least a partial amputation of his right leg during the accident, according to Maine State Police Sgt. Aaron Hayden, who investigated the crash.

Stillwell was riding a 1973 Harley-Davidson in the southbound lane with a group of four motorcyclists around 11:15 a.m. when the accident occurred, Hayden said.

“He was the last one in the group,” Hayden said. “It appeared he was preparing to exit the 132 ramp when he lost control.”

It was raining heavily at the time, and witnesses said Stillwell’s motorcycle started skidding back and forth, according to Hayden.

“He lost control, striking the guardrail,” he said. “It’s a partial amputation (of the right leg, below the knee) at this point,” Hayden said just before 4 p.m.

He said Stillwell also suffered what appeared to be a broken arm, as well as possible internal injuries.

He said Stillwell was conscious and alert at the scene and was taken by Delta Ambulance to Thayer campus, MaineGeneral Medical Center in Waterville, and then transferred to Maine Medical Center in Portland.

A spokeswoman at Maine Medical Center said that at 4:15 p.m., Stillwell was listed in critical condition there.