Accession Number:

ADA142592

Title:

National Dam Inspection Program. Lake Housatonic Dam and Dike (CT 00026 and CT 01714). Connecticut Coastal Basin, Housatonic River, Derby-Shelton, Connecticut. Phase I Inspection Report.

Descriptive Note:

Corporate Author:

CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV

Personal Author(s):

Report Date:

1981-08-01

Pagination or Media Count:

62.0

Abstract:

The Lake Housatonic Dam, formerly known as the Derby Dam, was completed in October, 1870 to facilitate river traffic on the Housatonic River and supply water to nearby factories. The entire facility consists of a 400-foot-long earthfill dike along the left bank average crest El. 39.4 NGVD a gatehouse at the left abutment that regulates flow into an industrial water supply canal a 675-foot-long by 23-foot-high spillway section spanning the river and a second gatehouse and boat lock at the right abutment. The earthfill dike has a maximum height of approximately 10 feet and is 15 feet wide at the crest. The total height of the dam from the downstream toe to the spillway section to the top of the earthfill dike is approximately 40 feet. The visual inspection of the Lake Housatonic Dam indicated that the structure is in fair condition. Deterioration of the right abutment, as evidenced by seepage through the masonry joints and the missing stone blocks near the spillway dam flashboards, may adversely effect the integrity of the abutment and the spillway section by permitting water to enter the interior of the structures. In addition, erosion the growth of trees and brush the lack of riprap slope penetration and the absence of protective ground cover on the dike adjacent to the left gatehouse will promote the deterioration of the embankment and ultimately diminish the stability of the structure if allowed to continue. The site also lacks the means to drawdown the impoundment.

Subject Categories:

  • Hydrology, Limnology and Potamology
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE