National Program for Inspection of Non-Federal Dams. Mount Higby Reservoir Dam (CT 00140), Connecticut River Basin, Middletown Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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Mount Higby Reservoir Dam is an earthfill embankment about 865 ft. long, with a maximum height of about 30 ft. The spillway channel is located at the left abutment and appears to be excavated in bedrock. A wet well outlet structure is connected to a water treatment plant below the dam by means of a buried 20 in. dia. service main. There is also a 36 in. dia. blowoff pipe with an outlet into a natural channel below the dam. Mount Higby Reservoir is utilized as a water storage facility for the City of Middletown. It is about 6,000 ft. long and has a surface at normal storage of 134 acres. The drainage area is 1.44 sq. mi. and the maximum storage to the top of the dam is 1,750 acre-ft. The test flood inflow is 3,500 cfs., while the outflow is 1,160 cfs. at a surcharge elevation of 366.5, about 0.3 ft. below the top of the dam. The spillway is therefore adequate to pass the test flood outflow without overtopping the dam. The dam is judged to be in generally good condition. Flows of undetermined origin, which may be seepage from the reservoir, appear in the downstream channel and cause two marshy areas below the dam. The dam and appurtenant structures appear to be well maintained, but there is some brush growth and several mature trees on the downstream side of the access road berm.
- Hydrology, Limnology and Potamology
- Civil Engineering