National Program for Inspection of Non-Federal Dams. Portland Reservoir Dam (CT 00149), Connecticut River Basin, Portland, Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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Portland Reservoir Dam is an earthfill dam with an impervious cores, about 400 ft. long, with a maximum height of about 28 ft. A 450 ft. long earthfill embankment serves as right abutment closure dike. The spillway is a 94 ft. long ungated overflow ogee crest located about 300 ft from the left abutment. A wet well and gate house just to the right of the spillway on the crest of the earth embankment houses the control valves for the inlet and outlet pipes. The test flood inflow equals 9,350 cfs. The routed test flow outflow 8,450 cfs overtops the dam by about 2.3 ft.. The spillway is adequate to pass about 25 percent of the routed test flood outflow with overtopping the dam. The dam appears to be in good condition, but there is extensive erosion along the upstream face of the right abutment dike. Brush growth has begun to intrude on the upstream face of the dike. Along the crest of the dam to the left of the spillway there are several mature trees.
- Hydrology, Limnology and Potamology
- Civil Engineering