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The Quabbin Reservoir is the largest inland body of water in the Commonwealth of Massachusetts and was built between 1930 and 1939. Today along with the Wachusett Reservoir, it is the primary water supply for Boston, some 65 miles (105 km) to the east, as well as 40 other communities in Greater Boston. It also supplies water to three towns west of the reservoir and acts as backup supply for three others.It has an aggregate capacity of 412 billion US gallons (1.56 km3) and an area of 38.6 square miles (99.9 km²). Quabbin Reservoir water flows to the Wachusett Reservoir using the Quabbin Aqueduct. The Quabbin watershed is managed by the Massachusetts Department of Conservation and Recreation, while the water supply system is operated by the Massachusetts Water Resources Authority. The Winsor Dam and the Goodnough Dike form the reservoir from impoundments of the three branches of the Swift River. The Quabbin Reservoir is part of the Chicopee River Watershed, which in turn feeds the Connecticut River.