Westchester Lake Dam
Westchester Lake Dam is a stone dam located in Westchester County, New York, built in 1920. It carries a High hazard potential classification and has a poor condition assessment.
About Westchester Lake Dam
The primary purpose of Westchester Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Kim Harcourt (private). It impounds the Annsville Creek near Annsville.
The dam stands 10 feet tall and stretches 150 feet across, creates a reservoir covering 19 acres, and has a maximum storage capacity of 72 acre-feet. Completed in 1920, the structure is over a century old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 03/20/2024.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The New York dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | New York |
| County | Westchester |
| Nearest City | Annsville |
| River/Stream | Annsville Creek |
| Coordinates | 41.31517, -73.93108 |
Physical Characteristics
| Dam Type | Stone |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 150 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| NID Storage | 72 acre-ft |
| Max Storage | 72 acre-ft |
| Normal Storage | 58 acre-ft |
| Surface Area | 19 acres |
| Max Discharge | 260 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Kim Harcourt |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 03/20/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00019 |
| Federal ID | NY00019 |
| More Info | State Dam Safety Program |