Accession Number:

ADA143050

Title:

National Program for Inspection of Non-Federal Dams. Crystal Lake Dam (CT 00104), Connecticut River Basin, Winchester, Connecticut. Phase I Inspection Report.

Descriptive Note:

Corporate Author:

CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV

Personal Author(s):

Report Date:

1979-08-01

Pagination or Media Count:

76.0

Abstract:

The dam is an earthfill embankment with a concrete and masonry spillway at the central part of the dam. A new highway embankment for Route 263 was constructed in 1976 just downstream from the dam. The old road is now used as an access to the dam lies just below the crest and extends along the dam from the right abutment to the spillway. The dam is approximately 520 feet long an 8 feet wide at the crest, which is 14 feet above the streambed of Sucker Brook. The spillway consists of a 45 foot long broad-crested concrete weir and a concrete apron which is just below the weir and enclosed by masonry training walls. This apron funnels the water into a 60 inch asphalt coated corrugated metal pipe through the new highway embankment. Based upon the visual inspection at the site and past performance, the dam is judged to be in fair condition. No evidence of structural instability was observed, however there are areas requiring attention such as seepage on the right toe of the dam, spalling of the spillway weir and wet areas and lime deposits on the masonry training walls. Peak inflow to the reservoir is 1250 cfs peak outflow is 550 cfs with the dam overtopped 0.1 feet. The spillway capacity is 410 cfs., which is equivalent to 75 of the routed test flood outflow. The hydraulichydrologic calculations do include the effects of the Route 263 highway embankment and 60 inch culvert.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE