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Gilboa Dam Environmental Studies

Scientific investigations safeguard wildlife-rich area accounting for nearly one-fifth of New York City water supply.
  • Gilboa Dam Environmental Studies – Gannett Fleming

    Environmental studies of 170-acre Gilboa Dam project site help protect New York Catskills watershed.

New York City Department of Environmental Protection

Hazen & Sawyer

Schoharie, New York

Our Role
Archaeological Investigations, Cultural and Natural Resource Studies, Dam Design, Dam Inspection, Environmental Studies, Wetland Delineation.

170-acre area
In Progress
  • Cultural resource studies performed because of project dredging/disposal

  • Gilboa Dam inspection/design complied with New York City regulations

  • Helped to protect wildlife and nationally recognized historic property.

Situated within a 170-acre project area, the 1,800-foot-long Gilboa Dam impounds the Schoharie Reservoir, responsible for storing approximately 20 billion gallons of water and providing 16 percent of New York City's water supply. In support of a Gilboa Dam joint venture involving dam inspection and design, Gannett Fleming is performing environmental and natural resource investigations that comply with New York City regulations and support state and federal applications for a project of this magnitude.

In addition to protecting state wildlife and watershed resources, we conducted cultural resource studies because the project involved dredging and disposal operations. Our agency coordination and effective environmental mitigation measures resulted in expedient regulatory approval while helping to sustain precious New York environmental resources.

What We Did

As engineering consultant, Gannett Fleming delineated wetlands and waterways; and conducted vernal pool and detailed vegetation, herptile (amphibian and reptile), avian, and small mammal surveys. We identified 60 wetlands and various short-lived, intermittent, and perennial waterways within the Gilboa Dam area. Surveying methods include:

  • Avian (transects, targeted searches, and incidental observation)

  • Herptile (time-constrained searches, timed dip-net surveys, anuran calling surveys, and egg-mass surveys)

  • Small mammal (live and pitfall traps, track and scat identification, incidental observation, and mist nets)

  • Vegetation (0.1-acre plots, timed-meander surveys, and point-centered quarter transects). 

Key Features

  • Archaeological investigation unearthed historic structures

  • Clean Water Act review and local, state, and federal permitting compliance

  • Habitat evaluation and natural resource studies to mitigate environmental impact

  • Scientific analyses and assessments of water quality and water supply.

Sustainability Features & Outcomes

  • Drinking water analyses ensure safe and ample supply

  • Identification of 60 wetlands to help protect Schoharie watershed

  • Wildlife documentation mitigates natural habitat disturbance.

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