Brewerton is a census-designated place (CDP) in the town of Cicero in Onondaga County and the town of Hastings in Oswego County in the U.S. state of New York. It lies at the west end of Oneida Lake at its outlet into the Oneida River. The population was 4,549 at the 2020 census. Maps of the 19th century indicate that this area was once known as Fort Brewerton, while Brewerton meant the Cicero portion.

Interstate 81 (I-81) is a part of the Interstate Highway System that runs from I-40 at Dandridge, Tennessee, to the Thousand Islands Bridge at Wellesley Island in New York, beyond which the short 2.7-mile (4.3 km) Ontario Highway 137 (Highway 137) links it to Highway 401. In the US state of New York, I-81 extends 183.60 miles (295.48 km) from the Pennsylvania state line southeast of Binghamton to the Canadian border at Wellesley Island northwest of Alexandria Bay. The freeway runs north–south through Central New York, serving the cities of Binghamton, Syracuse, and Watertown. It passes through the Thousand Islands in its final miles and crosses two bridges, both part of the series of bridges known as the Thousand Islands Bridge.