National Program for Inspection of Non-Federal Dams. Lake Saltonstall Dam (CT 00115), Connecticut Coastal Basin, East Haven-Branford, Connecticut. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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The dam is an earthfill structure with an upstream masonry and concrete retaining wall. The top of the dam is approximately 80 feet in width at the spillway and 20 feet above the streambed of the Farm River Diversion. The top of the dam is approximately 100 feet long along the upstream edge of the crest and approximately 200 feet long along the downstream edge of the crest. U.S. Route 1, a four lane highway, runs along the top of the dam. The spillway consists of a 10-foot-wide by 4.2-foot-high opening in the upstream masonry wall for the enclosed concrete ogee weir which feeds a 36 x 58-in. corrugated metal arch culvert through the embankment. The arch culvert connects to a junction box, as does the 24-inch low level outlet pipe, which runs from a concrete intake chamber 10 feet upstream of the upstream face of the dam. A 48-inch reinforced concrete pipe discharges from the junction box to the downstream streambed at the toe of the dam. Based upon the visual inspection at the site and past performance, the dam is judged to be in fair condition. No evidence of structural instability was observed, however surface sloughing and erosion of the downstream embankment slope was noted. Peak inflow to the reservoir is 7450 cfs peak outflow is 1900 cfs with the dam overtopped 1.9 feet. Based on our hydraulic computations, the spillway capacity is 220 cfs, which is equivalent to 12 of the routed test flood outflow.
- Hydrology, Limnology and Potamology
- Civil Engineering