National Program for Inspection of Non-Federal Dams. Winchester Lake Dam (CT 00105), Lower Housatonic River Basin, Winchester, Litchfield, Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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Winchester Lake Dam is a 675-foot long earth embankment dam with a maximum height of 23 feet. The top width of the dam is 14 feet. The upstream embankment slope is 2.51 and is protected with riprap below the water surface. The downstream slope is 21. The spillway is 25 feet wide, located at the right side of the dam. A 24-inch diameter cast iron pipe under the center of the dam provides a low level outlet. The lake is open to the public and used for recreational purposes. Winchester Lake has a storage volume of 3,120 acre-feet the size classification is thus intermediate. The dam and its appurtenances were judged to be in generally fair condition. The dam embankment is overgrown with extensive vegetation on both the upstream and downstream faces. Many large trees are in the vicinity of the toe of the slope. General erosion and sloughing of the slopes were noted. A 3-inch pipe was discharging a significant quantity of clear water at the toe of the slope adjacent to the blow-off location. The slope in this vicinity was wet and spongy. The upstream face has riprap in good condition however, the upper 7 feet of the slope is not protected. Erosion has occurred on both sides of the spillway structure. The capacity of the spillway is adequate to pass the 12 PMF spillway test flood outflow with a freeboard of 0.7 feet.
- Hydrology, Limnology and Potamology
- Civil Engineering