Accession Number:

ADA142659

Title:

National Dam Inspection Program. Quillinan Reservoir Dam (CT 00024), Housatonic River Basin, Ansonia, Connecticut. Phase I Inspection Report.

Descriptive Note:

Corporate Author:

CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV

Personal Author(s):

Report Date:

1980-02-01

Pagination or Media Count:

81.0

Abstract:

The dam, built in 1880 and reconstructed in 1884, has a total length of a 510 feet and consists of a stone and mortar masonry gravity section including the spillway with right and left earth-fill embankments. The top of the masonry section has an elevation of 138.5 and the top of the embankments ranges in elevation from 138.0 to 140.0. The masonry section is 100 feet long and 18 or - feet in height above the streambed of Beaver Brook. The spillway is a 35.0 foot long broad crested weir, is located at the center of the masonry section and has a crest elevation of 135.0. The outlet facilities are a 2.5 foot by 2.5 foot square conduit at the right end of the spillway and an 8 inch cast iron supply line at the center of the right section of embankment. Based upon the visual inspection at the site and past performance, the project is judged to be generally in poor condition. No evidence of instability was observed in the embankment, masonry section or appurtenant structures. However, there are areas which require monitoring and maintenance such as seepage at the right end of the masonry section, the uneven crest of the embankment and spalling of the concrete apron at the base of the spillway. The spillway capacity not including low point overflows with the reservoir level to the top of the dam is 720 cfs, which is equivalent to 29 of the routed test flood outflow.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE