Accession Number:

ADA144580

Title:

National Program for Inspection of Non-Federal Dams. Mashhpaug Pond Spillway (CT 00640), Dike (CT 01699), Dam (CT 01700), Quinebaug River Basin, Union, Connecticut. Phase I Inspection Report.

Descriptive Note:

Corporate Author:

CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV

Personal Author(s):

Report Date:

1981-03-01

Pagination or Media Count:

154.0

Abstract:

Mashapaug Pond Dam is an earth embankment dam approximately 290 feet long, 20 feet wide at the crest and 21 feet high at the outlet works. The dike is an earth embankment structure approximately 500 feet long, 15 feet high, and 16 feet wide at the crest. The spillway is located at the southerly end of the pond. It is a concrete structure 60 feet in length and 10 feet high. As a result of the visual inspection and hydraulic and hydrologic computations all three structures are considered to be in POOR condition. To assure the long term performance of these facilities, several items of concern require attention 1 The extensive seepage observed downstream of the dam and dike, which represents a potential for piping, erosion and embankment instability 2 Extensive tree growth on the dam and dike, which represents the risk of damage due to tree uprooting and seepage along decaying roots 3 The erosion at certain areas of the dike crest, the irregularity of the surface, and apparent creep of the downstream slope of the dike, which indicate insufficient stability 4 The deterioration of the concrete spillway structure, which can eventually result in its failure. The test flood has an inflow of 7,800 cfs and an outflow discharge equal to 6,1000 cfs. This outflow will overtop the dam and dike embankments by 1.5 feet and the spillway abutments by 4.3 feet.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE