Lake Dark Hollow Dam, also known as Whippoorwill Lake, is a privately owned earth dam located in Thornwood, Westchester, New York.
Wind
Humidity
Built in 1913, the dam serves as a water supply source with a storage capacity of 116 acre-feet and a surface area of 9 acres. The dam stands at a height of 28 feet and spans a length of 600 feet, regulating the flow of the TR-PLEASANTVILLE COVE stream.
Despite its age, the dam has been deemed to have a significant hazard potential and poor condition, with a last inspection conducted in November 2017. The dam's spillway is uncontrolled with a width of 10 feet, and it has a maximum discharge capacity of 335 cubic feet per second. While the risk assessment categorizes the dam as moderate, there are no specific risk management measures or plans in place as of the latest data update in March 2021. The dam is under the jurisdiction of the NYS DEC and is subject to state regulation, permitting, inspection, and enforcement. For water resource and climate enthusiasts, Lake Dark Hollow Dam presents a blend of historical significance and current challenges in dam management and safety.
Year Completed |
1913 |
Dam Length |
600 |
Dam Height |
28 |
River Or Stream |
TR-PLEASANTVILLE COVE |
Primary Dam Type |
Earth |
Surface Area |
9 |
Drainage Area |
0.4 |
Nid Storage |
116 |
Hazard Potential |
Significant |
Nid Height |
28 |