Grassy Sprain Reservoir

The Grassy Sprain Reservoir is a 150-acre (61 ha) storage reservoir in northern Yonkers, New York. It was completed in 1876 by the City of Yonkers as the city's main storage reservoir. The reservoir was formed by the Grassy Sprain Brook Dam which impounded the Sprain Brook River and Grassy Sprain River. The reservoir itself has a maximum capacity of 2,900 acre feet (3,600,000 m³), and water from the reservoir is sent to a water filtration plant prior to civil consumption.

Grassy Sprain Reservoir
Grassy Sprain Reservoir Show map of New York Grassy Sprain Reservoir Show map of the United States
Location	Yonkers, Westchester County, New York
Coordinates	40°58′18″N 73°51′4″W
Type	reservoir
Basin countries	United States

The Grassy Sprain Brook Dam is earthen, 40 feet (12 m) high, 600 feet (180 m) long and drains an area of 1.91 square miles (4.9 km²). In 1919 the City of Yonkers, which at that time had about 100,000 residents, estimated that the reservoir capacity would supply the city for 85 days.[1]