Town of Mt. Pleasant Water District #1 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 · 35 ft35 ft tall and 400 ft long, taller than 80% of U.S. dams with a recorded height. 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 Town of Mt. Pleasant Water District #1 Dam
The primary purpose of Town of Mt. Pleasant Water District #1 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 North Tarrytown.
The dam stands 35 feet tall and stretches 400 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 60 acre-feet, and collects water from a drainage area of 0 square miles. 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.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | New York |
| County | Westchester |
| Nearest City | North Tarrytown |
| River/Stream | Rockefeller Brook |
| Coordinates | 41.09694, -73.82278 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 400 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 60 acre-ft |
| Max Storage | 60 acre-ft |
| Normal Storage | 53 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 39 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 | NY00932 |
| Federal ID | NY00932 |
| More Info | State Dam Safety Program |