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| West Branch Reservoir | |
|---|---|
| Name | West Branch Reservoir |
| Location | Putnam County, New York, New York (state) |
| Type | Reservoir |
| Inflow | West Branch (Croton River), Muscoot River |
| Outflow | Croton River |
| Catchment | Croton Watershed |
| Basin countries | United States |
| Area | 2000 acres (approx.) |
| Volume | 22 billion US gallons (approx.) |
| Operator | New York City Department of Environmental Protection |
| Opened | 1890s–1900s |
West Branch Reservoir West Branch Reservoir is a man-made impoundment in Putnam County, New York that forms part of the New York City water supply system's Croton Watershed. The reservoir stores and releases water to supply Manhattan, Brooklyn, Queens, The Bronx, and Staten Island while integrating with regional infrastructure such as the New Croton Reservoir and Kensico Reservoir. It lies near communities including Patterson, New York and Mahopac and is managed by the New York City Department of Environmental Protection.
The reservoir is located within the larger network of the Croton Watershed and connects hydrologically to structures like the West Branch Croton River, the Muscoot Reservoir, and the New Croton Aqueduct. Its role complements the Catskill Aqueduct and the Delaware Aqueduct as part of the multi-basin supply array feeding the Croton Water Filtration Plant and downstream storage at Kensico Reservoir. Nearby transportation corridors include New York State Route 22 and U.S. Route 6, and the site lies within recreational and conservation landscapes associated with the Hudson River Valley and Putnam County parks.
Engineering and construction occurred during the late 19th and early 20th centuries as the City of New York expanded its water supply capacity following the completion of the Old Croton Aqueduct and the New Croton Dam. Key municipal actors included the New York City Department of Water Supply, Gas and Electricity and later the New York City Department of Environmental Protection. Major contractors and engineers of the era, influenced by practices from projects like the Catskill Aqueduct and works by firms associated with Chief Engineer John B. Jervis-era precedent, executed dam construction, land acquisition, and right-of-way negotiations affecting towns such as Patterson, New York and Brewster, New York. The project intersected with state-level infrastructure policy under administrations including those of Governor Theodore Roosevelt and later governors who oversaw public works funding and watershed protection statutes.
The reservoir receives runoff and tributary inflows from the Croton River basin, including feeder streams historically cataloged by the United States Geological Survey and monitored by the National Weather Service for precipitation and flood modeling. It contributes regulated releases to downstream impoundments such as the Muscoot Reservoir and the New Croton Reservoir, which in turn feed the New Croton Aqueduct en route to Kensico Reservoir. Hydrologic management considers stormwater from regional land uses in Putnam County, snowmelt from the Hudson Highlands, and climate-driven variability analyzed by research institutions like Columbia University and Cornell University. Water budgets reference interconnections with regional conveyance assets including Boyds Corner Reservoir and the Amawalk Reservoir.
Aquatic and riparian habitats around the reservoir support species documented by the New York State Department of Environmental Conservation and local conservation groups such as the Putnam Highlands Audubon Society. Vegetation zones include wetlands prioritized under protection programs mentioned by the New York State Department of State and monitored by the Environmental Protection Agency for nutrient loading. Water quality parameters—turbidity, dissolved oxygen, phosphorus, and microbial indicators—are tracked by the NYCDEP laboratory networks and academic partners like Colgate University and Fordham University. The area hosts native fish such as smallmouth bass and northern pike (regional species lists catalogued by DEC) and supports avifauna monitored under programs coordinated with the National Audubon Society.
Operational control is conducted by the New York City Department of Environmental Protection which coordinates with the United States Army Corps of Engineers on dam safety, inspection, and emergency action planning. Conveyance structures include spillways, outlet works, and inter-reservoir tunnels tied into the New Croton Aqueduct and flanked by control facilities comparable to those at Kensico Reservoir and New Croton Dam. Regulatory oversight involves state agencies including the New York State Department of Environmental Conservation and municipal entities such as the City of New York Department of Parks and Recreation where shoreline easements require joint management. Engineering standards reference guidance from professional bodies including the American Society of Civil Engineers.
Public access is limited by watershed protection policies administered by the NYCDEP and enforced in partnership with local law enforcement including the Putnam County Sheriff's Office. Nearby recreational amenities exist in parks such as Moraine Park and regional trails affiliated with the New York-New Jersey Trail Conference and the Appalachian Mountain Club. Angling, birdwatching, and hiking are pursued in adjoining public lands managed by Putnam County Department of Parks and Recreation and state facilities such as Fahnestock State Park. Educational outreach has been conducted with organizations like the Hudson River Sloop Clearwater and university extension programs.
Management addresses nonpoint source pollution, invasive species control, and habitat restoration in collaboration with agencies such as the New York State Department of Environmental Conservation, the Environmental Protection Agency, and local NGOs like the Putnam Land Trust. Challenges include nutrient runoff from development in Putnam County, sedimentation monitored using protocols from the United States Geological Survey, and climate-change impacts assessed by research centers at Columbia University and the Lamont–Doherty Earth Observatory. Remediation and adaptive management strategies reference federal statutes administered by bodies like the United States Environmental Protection Agency and state watershed regulations, while community engagement is fostered through partnerships with groups such as the Patterson Historical Society and regional watershed alliances.
Category:Reservoirs in New York (state) Category:New York City water supply system