Town of Mt. Pleasant Water District #3 Dam is a concrete dam located in Westchester County, New York, built in 1915. It carries a Significant hazard potential classification.
Dam profile
NID height · 7 ft7 ft tall and 300 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Town of Mt. Pleasant Water District #3 Dam
The primary purpose of Town of Mt. Pleasant Water District #3 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 Town of Mt Pleasant (local government). It impounds the Rockefeller Brook near Tarrytown.
The dam stands 7 feet tall and stretches 300 feet across, creates a reservoir covering 2 acres, and has a maximum storage capacity of 10 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 | 41.09778, -73.82528 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 300 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 10 acre-ft |
| Max Storage | 10 acre-ft |
| Normal Storage | 6 acre-ft |
| Surface Area | 2 acres |
| Max Discharge | 30 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | 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 | NY13602 |
| Federal ID | NY13602 |
| More Info | State Dam Safety Program |