Clinton Washington, 49, said to be homeless, was arrested Thursday by Watertown police on a charge of first-degree criminal sex act.
He was placed in the Metro-Jefferson Public Safety Building following arraignment before Watertown City Judge Eugene R. Renzi, who set bail at $10,000.
Mr. Washington, formerly of 623 Burchard St., is accused of having sexual contact with a girl on several times between June 1 and January 15, according to a police document. The girl was 11 when the conduct began, police said.
A friend of the family alerted police to the alleged activity, a detective said.