National Program for Inspection of Non-Federal Dams. Moodus Reservoir Dam (CT 00350), Connecticut River Basin, East Haddam, Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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Moodus Reservoir is a homogeneous earth embankment dam constructed around 1824. The dam has a maximum height of 17.5 feet and is approximately 275 feet long. The dam consists of a mortared stone spillway 140 feet long by 15 feet in height. An earth embankment with a total length of 135 feet is located to the left of the spillway. The overflow spillway discharges into a stone and concrete lined channel leading to an 18 foot by 8 foot bridge opening beneath Falls bashan Road, which is immediately downstream. this bridge has a wooden deck and a load capacity limited to 5 tons per axle. The earth embankments are approximately 2.5H1.0V and are grassed on the crest and both slopes. There is also an outlet structure with a discharge opening measuring 7 feet by 3 feet at the left spillway abutment of the dam which discharges through a separate stone masonry channel beneath Falls Bashan Road. Due to its age, Moodus Reservoir 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 data available, and very limited operational or maintenance evidence, the dam is judged to be in good condition. However, there are areas of concern which must be corrected to assure the safety and long-term performance of this dam. It is estimated that a test flood outflow of 6898 cfs 657 csm will overtop the dam by about 3.7 feet therefore, the spillway is considered inadequate. With the pool level at the top of the dam, the spillway can discharge 2182 cfs, or 32 percent of the test flood outflow.
- Hydrology, Limnology and Potamology
- Civil Engineering