The Third Reservoir Spillway and Dam, located in Thiells, New York, is a state-owned structure designed for water supply purposes.
Wind
Humidity
Completed in 1946, this earth dam stands at a height of 25 feet and spans 510 feet in length, with a storage capacity of 373 acre-feet. The dam is regulated by the New York State Department of Environmental Conservation and undergoes regular inspections to ensure its safety and effectiveness in managing water resources.
With a spillway type classified as uncontrolled and a spillway width of 15 feet, the Third Reservoir Dam poses a significant hazard potential and has been assessed to be in poor condition as of July 2019. Despite these challenges, the risk assessment for the dam is moderate, with measures in place for risk management. The surrounding area, which includes Rockland County, New York, relies on this dam for water supply, highlighting the importance of maintaining and monitoring its structural integrity in the face of climate change and increasing water demands. Enthusiasts in water resource and climate fields can appreciate the complexities and responsibilities associated with managing such critical infrastructure in the evolving environmental landscape.
Year Completed |
1946 |
Dam Length |
510 |
Dam Height |
25 |
River Or Stream |
TR-HORSE CHOCK BROOK |
Primary Dam Type |
Earth |
Surface Area |
21 |
Drainage Area |
0.28 |
Nid Storage |
373 |
Hazard Potential |
Significant |
Nid Height |
25 |
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Beaver Pond - Harriman State Park
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Beaver Pond Campsite
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Blue Mountain Reservation
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Croton Point Park
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Round Pond Military
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