National Program for Inspection of Non-Federal Dams. Massapoag Pond Dam (MA 00136), Merrimack River Basin, Dunstable, Massachusetts. Phase I Inspection Report.
Abstract
Massapoag Pond Dam is approximately 200 feet long and 12 feet high. The dam consists of earth embankments on each side of a timber weir. Sidewalls of the weir are constructed of concrete. One 2 ft. x 3 ft. timber gate is present in the timber weir and serves as a reservoir drain. The age of the dam is unknown but records of repair work in 1949 and 1973 have been located. The dam is in good to fair condition. There are no obvious signs of failure. It is therefore recommended that remedial work should be performed within two years of the owners receipt of this report. Based on the size and hazard classification in accordance with the Corps of Engineers guidelines, the recommended spillway test flood is the 100-year flood. Hydraulic analysis indicates that the spillway can only pass 36 percent of the test flood before overtopping the earth embankments. A 100-year test flood outflow would overtop the earth embankments by approximately 1 foot. It is recommended that an investigation be made on the earth embankments for the purpose of increasing the height of the embankments and allow the test flood to be confined to the spillway.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1978
- Accession Number
- ADA146163
Entities
Organizations
- New England District, U.S. Army Corps of Engineers