East Branch Reservoir, is a reservoir in the town of Southeast, New York, near the village of Brewster. Part of the New York City water supply system, it was formed by impounding the East Branch of the Croton River. Forming part of the Croton Watershed, it was placed into service in 1891, and lies some 56 km north of the city, in the southeast corner of Putnam County.
The East Branch Reservoir has a surface area of (2.12 km2, reaches a mean depth of 9.8 m, and holds 20 million m3 at full capacity.
