Welcome to Brinton Brook Sanctuary! Brinton Brook Sanctuary, located in Croton-on -Hudson, is managed by the Saw Mill River Audubon and is its largest sanctuary at 156 acres. The preserve originated as a donation of 112 acres to the National Audubon Society from Laura and Willard Brinton. In 1975, after Laura Brinton’s death, an additional 17 acres were added to the preserve. Saw Mill River Audubon gained full ownership of the preserve in 1991 from the National Audubon Society.