Accession Number:

ADA091274

Title:

National Dam Safety Program. Helderberg Lake Dam (Inventory Number NY276), Lower Hudson River Basin, Albany County, New York. Phase I Inspection Report,

Descriptive Note:

Corporate Author:

NEW YORK STATE DEPT OF ENVIRONMENTAL CONSERVATION ALBANY

Personal Author(s):

Report Date:

1980-08-15

Pagination or Media Count:

86.0

Abstract:

Helderberg Lake Dam consists of a 285 foot long earth embankment with concrete cutoff wall and a 55 foot wide concrete channel spillway. The maximum height above the original stream bed is approximately 35 feet. Both the upstream and downstream slopes of the earth embankment are 1 vertical to 2 horizontal, and the crest width is 12 feet. The dam was reconstructed in 1944 after a failure of the original structure in 1938. The spillway crest was increased in length from 35 feet to 55 feet and lowered 2 feet. The original cutoff wall which is founded on bedrock was lengthened and increased in height by 2.25 feet. A 20 in. drain pipe was installed and incorporated into the tunnel that was in the original dam. The examination of documents and visual inspection of Helderberg Lake Dam and appurtenant structures did not reveal conditions which constitute a hazard to human life or property. The discharge capacity of the spillway is inadequate for all storms in excess of 50 of the PMF Probable Maximum Flood.

Subject Categories:

  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE