National Program for Inspection of Non-Federal Dams. Columbia Lake Dam (CT 00520), Thames River Basin, Columbia, Connecticut. Phase I Inspection Report

Authors: CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV

Abstract:

Columbia Lake Dam is an earth dam which was constructed in 1865. The dam has a maximum height of 28.0 ft. and is approximately 295.0 ft. long (including spillway). The embankment slopes are approximately 2.5 H : 1.O V. The crest and downstream slope are grassed and the upstream face is riprapped above water level and to a depth of 3.0 ft. below water surface. The spillway is located on the extreme left abutment of the embankment and is a curved converging type contained between vertical rubble masonry walls. Based on existing information, this dam is considered to be in poor condition. There are several visible signs of distress which indicate a potential hazard at this site: undermining and erosion beneath the spillway bed, deterioration of the outlet gate to the point where its operation is difficult and unreliable, erosion holes adjacent to the operating mechanism which may indicate leakage or seepage along the outlet conduit, emerging seepage along the downstream toe of the dam, dislodged stonework and obstructed downstream spillway channel and a general lack of proper, regular maintenance. A spillway design test flood outflow of 1418 cfs (one-half of the probable maximum flood) will overtop the dam by approximately 0.93 ft.

Pages:

111

Report Date:

SEP 1978

Report Number:

A867441

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