The agency says the incident happened at 10:25 pm (local time) yesterday.
Its statement says "this individual was immediately arrested by USSS Uniformed Division Officers," and says the person was taken into custody and charges are pending.
The Secret Service did not identify the person arrested or divulge other details.
The agency has been beset by a series of security lapses, including an incident last Sept. 19 in which authorities said a man with a knife jumped a fence and ran inside the executive mansion, looking for the president.