Ferguson Lake Dam is an earth dam located in Westchester County, New York, built in 1915. It carries a Significant hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 200 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Ferguson Lake Dam
The primary purpose of Ferguson Lake Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Nys Parks & Recreation Taconic;town of Mt Pleasant (local government). It impounds the Rockefeller Brook near Tarrytown.
The dam stands 12 feet tall and stretches 200 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 15 acre-feet. Completed in 1915, the structure is over a century old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 02/18/2022.
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Location
| State | New York |
| County | Westchester |
| Nearest City | Tarrytown |
| River/Stream | Rockefeller Brook |
| Coordinates | 41.09917, -73.82694 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 200 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 15 acre-ft |
| Max Storage | 15 acre-ft |
| Normal Storage | 8 acre-ft |
| Surface Area | 3 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Nys Parks & Recreation Taconic;town of Mt Pleasant |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 02/18/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY13603 |
| Federal ID | NY13603 |
| More Info | State Dam Safety Program |