A Sonoma County judge Monday sentenced a 13-time convicted drunken driver from Santa Rosa to five years, eight months in state prison for his most recent offense involving a non-injury accident.

Judge Elliot Daum handed down the aggravated term to Robert Feenan, 50, who was arrested in Nov. after rear-ending another car on Stony Point Road. A toxicology report showed he had a .44 percent blood-alcohol level — nearly five times the legal limit, said Diana Gomez Assistant District Attorney.

The crash happened while he was on probation for a 2008 drunken-driving conviction and five months after he completed an alcohol treatment program, Gomez said.

"We believe in this case the only way to keep the public safe is to incarcerate him as long as possible," Gomez said.

All of his convictions have been in Sonoma County. Seven of his DUIs came within the last 10 years and were admissible as priors. He had four others between 1983 and 1990.

Since 1983, just before Feenan turned 24, the longest he went without a DUI was four years between from 1999 to 2003, when he was in prison for 27 months. In 1999 he was sentenced to three years, eight months in prison for his 10th DUI.

But jail time has been brief largely because he has not injured others on the roadway.

Judge Daum, who meted out a year in county jail for his last conviction, gave Feenan three years for the latest DUI, two years for his prison priors and eight months for violating probation, Gomez said.

Under the 50 percent sentencing law, he could be out in 2 years nine months, Gomez said.