Gilboa Reconstruction Named National Dam Rehabilitation Project of the Year

The $138 million dam reconstruction – believed to be the largest public works project in the Catskills – was completed two years ahead of schedule.

Pictured at the award ceremony are members of ASDSO, NYCDEP, and DEP’s consulting engineering firms for the project, Hazen and Sawyer and Gannett Fleming.

Working closely with NYCDEP, Hazen and Sawyer inspected the facilities in joint venture and identified a number of immediate steps that would improve dam stability before the long-term rehabilitation was complete.

Siphons provide up to 500 mgd of releases from the reservoir and can be used with the crest gate system to manage water levels in Schoharie Reservoir to meet Snowpack Management targets, a capability which was nonexistent with the original design.

(NEW YORK, NY – October 1, 2015) – The NYCDEP’s $138 million full-scale rehabilitation of Gilboa Dam was recently named the Association of State Dam Safety Officials (ASDSO) National Dam Rehabilitation Project of the Year.

Despite a nine-month setback in the wake of Hurricane Irene, which inflicted historic damage upon the Catskills, staff completed the project in 2014, two years ahead of schedule. Work included the addition of approximately 234 million pounds of concrete, molded and dyed to resemble the original bluestone face of the dam, along with more than 500 massive spillway slabs and upgrades to the abutment walls that support the dam.

Several new features were added to the dam during its rehabilitation, including an inspection gallery inside the dam that runs its entire length. The gallery—which also includes instruments to constantly measure stress on the dam— will allow engineers to visually inspect the inside and outside of the dam on a regular basis.

The dam was also designed with 3-, 6- and 12-foot steps that dissipate the energy of water as it spills from the reservoir. The east and west abutment walls that support Gilboa Dam were also strengthened through the installation of 40 post-tensioned anchors, or steel cables that pull them tight to the bedrock.

The National Dam Rehabilitation Project of the Year recognizes unique projects that advance state-of-the-art designs in the field of dam safety and embody the professional engineering and construction standards that dam safety requires.

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