This is equivalent to 6.3 inches of water covering its drainage area of 12 square miles. The lake can store up to 1.27 billion gallons of water for flood control purposes. The flood storage area of the project, which is normally empty and is utilized only to store floodwaters, totals 266 acres. Hancock Brook Lake contains a 40-acre conservation pool that has a maximum depth of six feet. Maintenance of the dike is the responsibility of the railroad company. The weir’s crest elevation is 21 feet lower than the top of the dam. The project consists of an earthfill dam with stone slope protection 630-feet long and 57-feet high a 2,300-foot-long earthfill dike with a maximum height of 35-feet along the relocated railroad track an ungated 250-foot-long rectangular concrete conduit three feet wide and four feet six inches high and a chute spillway cut in rock with a concrete weir 100 feet long. The water level rose to 23.4 feet at the dam, utilizing 58 percent of the storage capacity. The highest pool level recorded since the completion of Hancock Brook Dam was in June 1982. The project has prevented $52.5 million in flood damages since it was built (as of September 2011). Project construction required the relocation of 1.3 miles of town roads and about two miles of railroad track. The project stores floodwaters to reduce flood damages on the Naugatuck River and the lower Housatonic River.Ĭonstruction began in July 1963 and was completed in September 1966. The dam is a part of a network of seven flood control reservoirs built by the Corps of Engineers in the Naugatuck River Basin. From Plymouth, it can be reached by taking Route 262 west to Graystone Road.
It is situated about 4.5 miles north of Waterbury. The dam at Hancock Brook Lake is located on Hancock Brook in Plymouth, Conn., and 3.4 miles upstream of the confluence of the brook and the Naugatuck River.
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