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| Reservoirs in New York (state) | |
|---|---|
| Name | Reservoirs in New York (state) |
| Location | New York |
| Type | Reservoirs |
| Basin countries | United States |
Reservoirs in New York (state) are artificial lakes and impoundments created across New York (state) to store water for urban supply, flood control, hydropower, and recreation. They include the system serving New York City, the reservoirs of the Hudson River watershed, and western New York impoundments tied to the Niagara River and Erie Canal. The reservoirs intersect with numerous institutions, engineering firms, and conservation organizations involved in water resource management.
New York's reservoirs range from small municipal impoundments to vast systems such as the Delaware River basin reservoirs and the Neversink Reservoir, each linked to agencies like the New York City Department of Environmental Protection and the New York State Department of Environmental Conservation. Prominent reservoirs include Ashokan Reservoir, Cannonsville Reservoir, Kensico Reservoir, and Croton Reservoir components, with ancillary works at Hillview Reservoir and New Croton Dam. Reservoirs interact with regional infrastructure such as the New York State Thruway, Taconic State Parkway, Metropolitan Transportation Authority corridors, and municipal utilities in Albany, New York, Buffalo, New York, and Rochester, New York.
Reservoir construction in New York accelerated during the 19th and 20th centuries alongside projects like the Erie Canal and municipal expansion in Brooklyn, Manhattan, and Bronx. Engineering milestones included designs by firms associated with Olmsted Brothers landscape projects and designers influenced by Frederick Law Olmsted principles for watershed protection. Major works such as the New Croton Dam and the Catskill Aqueduct were authorized under state legislation and municipal charter actions involving the New York State Legislature and the Mayor of New York City. Conflicts over eminent domain and displacement affected communities like Dunraven, New York and villages submerged to create reservoirs, prompting litigation in courts including the New York Court of Appeals.
The New York City water supply system integrates the Catskill Mountains, Delaware River, and Croton River reservoirs—key nodes include Ashokan Reservoir, Pepacton Reservoir, Slide Mountain catchments, Kensico Reservoir as a balancing basin, and the Jerome Park Reservoir. Upstate, the Niagara Power Project and tributary reservoirs serve the Niagara River and connect to Hydropower installations at Lewiston, New York. The Finger Lakes region includes reservoirs that feed municipal systems in Ithaca, New York and Geneva, New York, while the Mohawk River corridor features impoundments tied to the Erie Canal system and flood control projects coordinated with the U.S. Army Corps of Engineers.
Operational management is overseen by entities such as the New York City Department of Environmental Protection, Department of Environmental Conservation, and regional water authorities like the Westchester County Department of Public Works and Metropolitan Water Board. Treatment facilities at Catskill/Delaware UV Disinfection Facility and infrastructure including the Delaware Aqueduct and Catskill Aqueduct mediate flows to urban centers like New York City and suburban counties including Westchester County and Putnam County. Management strategies reference federal statutes administered by the Environmental Protection Agency and programs coordinated with the Federal Emergency Management Agency for flood response.
Reservoir creation altered habitats for species protected under statutes such as the Endangered Species Act and the New York State Environmental Conservation Law, affecting fish communities like brook trout and migratory routes of American eel. Watershed protection initiatives involve collaborations with organizations such as the Sierra Club and The Nature Conservancy to preserve riparian buffers in the Catskill Park and Hudson River Valley National Heritage Area. Issues include algal blooms monitored by the U.S. Geological Survey and invasive species responses coordinated with the New York State Invasive Species Council.
Many reservoirs permit regulated recreation overseen by agencies like the New York State Office of Parks, Recreation and Historic Preservation and county park departments in Suffolk County and Westchester County. Public amenities are associated with sites such as Croton Gorge Park and trails connecting to the Appalachian Trail corridor. Restrictions for potable supply reservoirs often limit activities; exceptions and permit regimes involve stakeholders including local municipalities and advocacy groups like the Open Spaces Institute.
Major engineering elements include earthen embankments, masonry structures exemplified by the New Croton Dam, spillways at Ashokan Reservoir, and conveyance tunnels like the Catskill Aqueduct and Delaware Aqueduct. Projects have engaged firms and authorities such as the U.S. Army Corps of Engineers, private engineering consultants, and academic partners at Columbia University and Cornell University for hydrologic modeling. Maintenance programs address sedimentation, dam safety retrofits complying with standards from the Federal Energy Regulatory Commission where hydropower facilities exist.
Policy frameworks derive from state statutes administered by the New York State Department of Environmental Conservation and municipal codes enforced by city agencies including the New York City Department of Environmental Protection. Federal laws such as the Clean Water Act and programs by the Environmental Protection Agency shape water quality standards, while regional compacts like the Delaware River Basin Commission influence allocation for interstate basins. Litigation and stakeholder negotiations have involved entities such as the New York State Attorney General and municipal governments in disputes over land acquisition, water rights, and environmental review under the National Environmental Policy Act.