Description
The project consists of a rolled earth fill dam with stone slope protection 12,420 feet (3,790 m) long and 68 feet (21 m) high. The spillway comprises a concrete weir 690 ft (210 m) in length. The weir's crest elevation is 16 feet (4.9 m) lower than the top of the dam. The permanent lake at Mansfield Hollow Dam, Naubesatuck Lake is 450 acres (1.8 km2) in size. The flood storage area for the entire project covers about 1,880 acres (7.6 km2) in the towns of Mansfield, Windham, and Chaplin, Connecticut. The entire project, including all associated lands, covers 2,472 acres (10.00 km2). The Mansfield Hollow Dam can store up to 16.1 billion US gallons (61,000,000 m3) of water for flood control purposes. This is equivalent to 5.8 inches (150 mm) of water runoff from its drainage area of 159 square miles (410 km2).
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