In 1924, NY 3 was assigned to the New York portion of the Theodore Roosevelt International Highway, an auto trail that extended from Portland, Maine, to Portland, Oregon. In New York, it connected North Tonawanda (near Niagara Falls) in the west to Plattsburgh in the east via Rochester and Watertown. In Jefferson County, the trail and NY 3 entered Watertown on modern U.S. Route 11 and exited on what is now NY 12F. At Dexter, NY 3 turned north to follow current NY 180 and NY 12E to Clayton, where it continued eastward on modern NY 12.