Garnerville Dam
Garnerville Dam is a masonry dam located in Rockland County, New York, built in 1875. It carries a Significant hazard potential classification and has a fair condition assessment.
About Garnerville Dam
Garnerville Dam is a dam in Rockland, New York. The dam is owned by Rockland County Highway Department (local government). It impounds the Minisceongo Creek near West Haverstraw.
The dam stands 29 feet tall and stretches 330 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 198 acre-feet, and collects water from a drainage area of 17 square miles. Completed in 1875, the structure is one of the older dams in the region, with over a century and a half of service.
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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 10/10/2024.
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Location
| State | New York |
| County | Rockland |
| Nearest City | West Haverstraw |
| River/Stream | Minisceongo Creek |
| Coordinates | 41.20611, -74.00278 |
Physical Characteristics
| Dam Type | Masonry |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 330 ft |
| Year Completed | 1875 (151 years old) |
Storage & Hydraulics
| NID Storage | 198 acre-ft |
| Max Storage | 198 acre-ft |
| Normal Storage | 100 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 17 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | ROCKLAND COUNTY HIGHWAY DEPARTMENT |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/10/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00744 |
| Federal ID | NY00744 |
| More Info | State Dam Safety Program |