AUBURN — Bates College student Zachary Fenno has pleaded guilty to a charge of failure to disperse as part of a plea deal that included dismissal of a misdemeanor charge of disorderly conduct.

Fenno, of Armonk, N.Y., was one of 11 people arrested last May after Lewiston police responded to Bates security officers’ reports of an unruly crowd on campus near Smith Hall. The problem started when Bates security staff tried to clear the crowd on Bardwell Street in front of Smith Hall to allow a United Ambulance crew through to help two women who needed medical attention, possibly because of alcohol use, at or near that dorm.

About half of the students left as requested, and security officers called Lewiston police for assistance clearing the remaining people who refused to leave. A number of people in the crowd became confrontational, according to police, and a Lewiston officer was injured as students and officers clashed.

At the time, Fenno was charged with disorderly conduct and failure to disperse following a police order to do so, and was detained briefly in the Androscoggin County Jail before posting bail.

In Androscoggin County Superior Court on Wednesday, Fenno agreed to a deal on the failure to disperse charge. If he pays a court-ordered $150 supervision fee and completes 50 hours of community service by Nov. 14, 2011, he can request that the conviction be dismissed on or after Dec. 22, 2011, leaving him no criminal record.

According to Fenno’s attorney, Henry Griffin, who practices in Lewiston, Fenno arrived in court prepared for a trial on both charges, but after consultation with Assistant District Attorney Andrew Matulis, agreed to a deal that included dismissal of the disorderly conduct charge.

Justice Robert Clifford, who presided over Fenno’s plea, said, “I think this is a very reasonable disposition in this case,” making it clear to Fenno that if he complied with the terms of the deal, “you’ll have no record at all” in a year’s time.

The deal Fenno accepted is nearly identical to one accepted by former Bates student Andrew Livingston earlier this month.

Livingston, who lives in Waterville, agreed to plead guilty to resisting arrest, and to serve 50 hours of community service in exchange for the state dropping two other charges against him, including a charge that he refused to submit to arrest. Livingston will also have the opportunity to return to court next year and request withdrawal of his plea, which would allow his criminal record to be cleared.

Of the 11 students arrested in connection with the college’s traditional wandering party when graduating seniors visit their first-year dorms on campus, three have accepted plea agreements and the rest are preparing to go to trial.