National Program for Inspection of Non-Federal Dams. Congdon Dam (CT 00234), Thames River Basin, Montville, Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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Congdon dam is a stone-faced earth embankment dam constructed around 1900 and was used for power and process water at a mill located downstream which is presently abandoned. The dam has a maximum height of 35 feet and is approximately 150 feet in length including the spillway. The spillway is a stone masonry uncontrolled, vertical fall, sharp crested weir, 50 feet in length. The assessment of the facility is based on the visual inspection sine engineering, operational and maintenance data are not available. The dam is judged to be in FAIR condition with several maintenance items that require attention to insure the long-term performance of the structure. They include inoperable outlet works structures, missing and dislodged masonry blocks on the downstream face of the dam, seepage along the downstream face of the right of the overflow spillway, missing mortar between the stone masonry, the lack of a scheduled inspection or maintenance program, an irregular crest surface, and trees and brush growing in the stone masonry walls, spillway and on top of the dam. Assuming the pool elevation at the top of the dam, the spillway can pass a flow of 1,845 CFS, which represents only 24 percent of the routed test flood outflow.
- Hydrology, Limnology and Potamology
- Civil Engineering