The Scituate Reservoir is the largest inland body of water in the state of Rhode Island. It has an aggregate capacity of 39 billion U.S. gallon and a surface area of 5.3 square miles (13.7 km²). It and its six tributary reservoirs—which make up a total surface area of 7.2 square miles (18.6 km²)—supply drinking water to more than 60 percent of the state population. The surrounding drainage basin that provides water to the reservoir system covers an area of about 94 square miles (243.5 km²), which includes most of the town of Scituate and parts of Foster, Glocester, Johnston, and Cranston. The Scituate Reservoir is operated by Providence Water Supply Board.
The reservoir is formed by an earth-filled dam spanning the North Branch Pawtuxet River, about 3200 feet (975 m) long by 100 feet (30 m) high. An aqueduct from the dam carries water to a nearby treatment plant, which filters the water. Two major aqueducts carry the water from the plant into the distribution system. The origin (from [www.wikipedia.org](http://www.wikipedia.org/wiki/Scituate_Reservoir).