National Program for Inspection of Non-Federal Dams. Pecks Pond Dam (MA 00843), Housatonic River Basin, Pittsfield, Massachusetts. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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Pecks Pond Dam is a stone masonry and earth embankment dam approximately 490 feet long with a maximum hydraulic height of 31 feet and a top of dam storage of 155 acre-feet. The dam has a variable top width of between 8 feet and 20 feet and side slopes of approximately 2H to 1V. Discharge is over a grouted stone masonry spillway which has a length of about 40 feet. There is now a partial breach in the spillway. The bottom of the breach opening is 11 feet below the original spillway crest and 13 feet below the top of the dam. The dam presently impounds about 15 acre-feet. The storage capacity at the elevation of the test flood is 150 acre-feet. Based on engineering judgment and past performance of the dam and outlet works, the project is considered to be in poor condition. The breaching activities have left a portion of the embankment in an unstable condition and subject to erosion by discharge through the breach in the spillway. A 5-foot diameter penstock has been partially removed however, discharge through the penstock is still possible and could cause erosion of a large portion of earth embankment. The spillway capacity at the top ot the dam is 108 of the test flood outflow. However, because of the structural condition of the spillway and adjacent walls, it is unlikely that the dam could safely pass high discharges.
- Hydrology, Limnology and Potamology
- Civil Engineering