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National Program for Inspection of Non-Federal Dams. Acme Pond Dam (CT 00172), Quinebaug River Basin, Killingly, Connecticut. Phase I Inspection Report.

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The dam at Acme Pond is an earth embankment structure with a vertical downstream stone masonry wall. It is 12 feet wide at the crest, 570 feet long, and 10 feet high above the roadway which runs along the entire toe of the downstream side of the dam. Its maximum height above the tail race channel to the mill, at the spillway, is 18.7 feet. This channel passes beneath the roadway and the mill, and then exits into a small mill pond about 200 feet downstream of Acme Pond Dam. The stone masonry spillway, located near the right abutment of the dam, is a broad crest weir 16 feet long and 3.2 feet high. The dam is located on Whetstone Brook and is at the outflow point of a 5.2 square mile watershed which contains 5 other reservoirs. Together, these reservoirs provide substantial storage capacity to dampen the effect of major flooding. The storage capacity of Acme Pond at the top of the dam is 29 acre feet. As a result of the visual inspection and hydraulic and hydrologic calculations, the dam is considered to be in FAIR condition. To assure the long term performance of this structure, several items will require further attention. These items concern themselves with the downstream masonry wall, which has tilted and is bulging at many locations, indicating potential future instability the crest of the dam, which has settled near the left abutment and the capacity of the spillway and the downstream channel, which are inadequate to pass the test flood outflows, particularly beneath the mill structure. This test flood has an inflow of 1,670 cfs and an outflow discharge of 1,660 cfs, and will overtop the dam by 1 foot.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

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