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National Program for Inspection of Non-Federal Dams. Fountain Lake Dam (CT 00025), Naugatuck River Basin, Ansonia & Seymour, Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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The Fountain Lake Dam consists of a mortared stone masonry structure with an upstream earth embankment, and an overflow spillway located near the center of the dam. An earth embankment forms the right end of the dam. The dam has a maximum height of 20 feet, and an overall length of 315 feet. The spillway consists of a concrete cap on the stone masonry wall. The crest length is 22.3 feet and the freeboard from spillway crest to the top of the concrete wall is 1.7 feet. The outlet works consist of a 12-inch supply main from an upstream intake structure or gate chamber to a downstream chemical treatment building. There are high level and low level 16-inch intake sluice gates located on the outside of the upstream wall of the gate chamber. The PMF was selected as the Test Flood. The dam has a water shed of only 0.17 square miles. The inflow was calculated to be 360 cfs and the routed outflow was 335 cfs. The spillway has a capacity of 140 cfs or 42 percent of the routed outflow. The Test Flood routed outflow would overtop the dam by 0.3 feet. The condition of the dam at the time of inspection was judged to be fair. Conditions that could affect the integrity of the dam are the seepage existing through the face and downstream of the dam the erosion of the upstream embankment the growth of large trees at the toe of the dam the outlet pipe being controlled by downstream gates instead of upstream sluice gates and the lack of adequate spillway capacity. Author
APPROVED FOR PUBLIC RELEASE