Accession Number:

ADA090938

Title:

National Dam Safety Program, Mill Pond Dam (Inventory Number NY 368), Lake Champlain Basin, Essex County, New York. Phase I Inspection Report

Descriptive Note:

Corporate Author:

NEW YORK STATE DEPT OF ENVIRONMENTAL CONSERVATION ALBANY

Personal Author(s):

Report Date:

1980-08-28

Pagination or Media Count:

114.0

Abstract:

Examination of available documents and a visual inspection of the dam did not reveal conditions which constitute an immediate hazard to human life or property. Several deficiencies were noted and these should be corrected within 6 months of the date of final approval of this report. Among the actions which should be taken are refilling the cribs which are missing material, repair of displaced timbers on the downstream face, replace broken timbers, repair of the valve on the drain, and repair of the spalling concrete on the wingwall which extends downstream of the north abutment. In addition, a detailed emergency action plan and warning system should be developed. This dam does not have sufficient spillway capacity to adequately discharge the peak outflow from one- half the PMF. The analysis indicates that the dam would be overtopped by all storms exceeding 15 of the PMF. However, the structural stability analysis indicates that the dam would be stable when subjected to the PMF storm event. Therefore, the spillway is assessed as being inadequate. The water surface level for either the PMF or one-half the PMF would result in flow around the northern end of the concrete wingwall which extends from the abutment of the dam. An accurate topographic survey should be performed where this end around flow is likely to occur.

Subject Categories:

  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE