Rehabilitation of Crescent and Vischer Ferry Dams—Construction Techniques & Problem Solutions

by Andrew C. Sumner, New York Power Authority, United States,



Document Type: Proceeding Paper

Part of: Geotechnical Practice in Dam Rehabilitation

Abstract: This paper reviews some of the problems encountered during the rehabilitation of the Crescent & Vischer Ferry Dams and the techniques used to comply with strict water level regulations and other restrictions imposed on this navigable waterway. In particular, the paper focuses, not so much on what was done, but how the following tasks were accomplished: Installation of post tension anchors while maintaining normal water levels and discharges over the Crescent spillway. Rehabilitation of the Crescent regulating structure. Relocation of the Vischer Ferry regulating structure and diversion of required river discharges during construction of powerhouse expansion. Construction of the Vischer Ferry pier nose. Access and dewatering techniques used for various repairs on the dam structure at both projects. Rehabilitation of dam crest and flashboard upgrade while maintaining near normal river levels. The dam rehabilitation work was completed in 1990. It's success is due to the cooperative efforts and value engineered approach by the Owner, the Engineer, and the Contractor to solve the numerous obstacles encountered during the course of construction.

Subject Headings: Rehabilitation | Ferries | Spillways | Water discharge | Dams | Water level | Drop structures | Construction management

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