Bourque apologized in a statement Wednesday after admitting in Lawrence District Court that prosecutors have sufficient evidence to convict him of driving under the influence when his Mercedes-Benz rear-ended a minivan on June 24.
Police said Bourque had a blood-alcohol level of 0.249, three times the state's legal limit to drive.
Under Massachusetts law, Bourque's "admission to sufficient facts" plea will resolve the case without a guilty finding if he successfully completes a one-year term of probation.
A judge also suspended Bourque's driver's license for 45 days.
Bourque played for the Bruins for 21 seasons, then helped the Colorado Avalanche win a Stanley Cup in 2001 before retiring.