National Program for Inspection of Non-Federal Dams. Williams Pond Dam (CT 00551), Thames River Basin, Lebanon, Connecticut. Phase I Inspection Program.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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Williams Pond Dam is an earth dam with a stone masonry downstream face constructed about 1865. The dam has a maximum height of 23.0 feet and is approximately 280.0 feet in length. It has a left and right embankment of 60.0 feet and 180 feet, respectively, separated by an earth filled masonry spillway structure 39.0 feet wide. Located southwest of the main dam approximately 200.0 feet, an earth embankment dike 475.0 feet long protects Route 207. Due to its age, Williams Pond Dam was neither designed nor constructed by present state of the art methods. Based upon the visual inspection at the site, the lack of engineering, operational or maintenance data, there are areas of concern which must be corrected to assure the long term performance of this dam. The dam is considered to be in fair condition. Signs of visible distress which indicate a potential hazard are seepage emerging along the downstream toe of the dam at both embankments and the spillway, leakage through the downstream masonry face of the spillway structure erosion and wear on the upstream face of the dam and dike, and accumulation of debris and vegetation in the downstream channel. Assuming the pool level at top of the dam, the spillway can pass a flow of 283 cfs, which represents 16 percent of the test flood outflow.
- Hydrology, Limnology and Potamology
- Civil Engineering