Brant Lake is a hamlet in the town of Horicon in Warren County, New York, United States. It is located approximately halfway between Albany to the south and Plattsburgh to the north. Since the mid-1880s, Brant Lake has been a popular fishing and hunting area among wealthy visitors, including Theodore Roosevelt. Circa 1900, several hotels began catering to th…Brant Lake is a hamlet in the town of Horicon in Warren County, New York, United States. It is located approximately halfway between Albany to the south and Plattsburgh to the north. Since the mid-1880s, Brant Lake has been a popular fishing and hunting area among wealthy visitors, including Theodore Roosevelt. Circa 1900, several hotels began catering to these wealthy visitors. Summer camps for youth were established around the same time.