Accession Number:

ADA142688

Title:

National Program for Inspection of Non-Federal Dams. Margerie Lake Reservoir Dam (CT 00063), Housatonic River Basin, Danbury, Connecticut. Phase I Inspection Report.

Descriptive Note:

Inspection rept.

Corporate Author:

CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV

Personal Author(s):

Report Date:

1978-12-01

Pagination or Media Count:

60.0

Abstract:

Margerie Lake Reservoir Dam is an earthfill embankment about 735 ft. long with a maximum height of about 28.5 ft. and a crest width of 10 ft. It is located at the south end of the reservoir. The dike at the north end is also an earthfill embankment, about 1,104 ft. long with a maximum height of about 16 ft. The spillway is located at the right abutment of the main dam, all or mostly in ledge rock, and a 1.2 ft. high concrete control sill with its crest 6.5 ft. below the crest of the dam, near the low point of the valley. The outlet is a 30 in. dia. pipe through the dam and continued in buried trench to the filter plant about 600 ft. south of the dam. No bypass or blowoff from this outlet has been provided. The dam appears to be in good condition. The spillway is adequate to pass the full PMF test flood without overtopping the dam. The north dike also appears to be in good condition. Seepage at the downstream toe of the dam was noted. A toe drain at the north dike appears to be functioning as intended. The outlet control valves may not be serviceable.

Descriptors:

• *EARTH DAMS
• DEFICIENCIES
• SAFETY
• VISUAL INSPECTION
• CONNECTICUT

Subject Categories:

• Hydrology, Limnology and Potamology
• Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE