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National Program for Inspection of Non-Federal Dams. North Stamford Reservoir Dam (CT 00048), Rippowam River Basin, Stamford, Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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North Stamford Reservoir Dam is a concrete masonry gravity dam 350 ft. long, with a maximum height of 40 ft. An earth fill covers the down-stream slope of the dam. To the right of the concrete dam there is an earth dike embankment 437 ft. long with a maximum height of 24 ft. The spillway at the right abutement has an ungated ogee crest 280 ft. long with provision for flashboards. The dam is operated as a water supply facility for the City of Stamford. Maximum storage capacity of the reservoir to top of dike is about 2,330 acre-feet and the drainage area is 23.2 square miles. There is a some seepage through the rock in the spillway outlet channel. Brush and several trees are growing on the earth dike. The concrete on the spillway abutment and center walls is spalling, and there are minor seeps at construction joints in the spillway overflow weir. The concrete dam, earth dike and spillway are all judged to be in generally good condition. The test flood inflow is 23,700 cfs. Of the test flood outflow of 23,800 cfs, 17,900 cfs would be discharged by the spillway, providing that the flashboards were not installed 4,800 cfs would flow over the gravity dam and 1,000 cfs would flow over the dike. The gravity dam would be overtopped by 2.8 ft. and the dike by 0.8 ft. The facility could handle 38 percent of the test flood without any overtopping, with a 6,900 cfs. spillway discharge.
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