Tomkins Cove Dam
Tomkins Cove Dam is an earth dam located in Rockland County, New York, built in 1915. It carries a Significant hazard potential classification and has a poor condition assessment.
About Tomkins Cove Dam
The primary purpose of Tomkins Cove Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by William Dwyer & Maureen Naughton (private). It impounds the Tr-hudson River near Tomkins Cove.
The dam stands 8 feet tall and stretches 325 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 16 acre-feet, and collects water from a drainage area of 5 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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 04/26/2023.
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Location
| State | New York |
| County | Rockland |
| Nearest City | Tomkins Cove |
| River/Stream | Tr-hudson River |
| Coordinates | 41.25028, -73.98944 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 325 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 16 acre-ft |
| Max Storage | 16 acre-ft |
| Normal Storage | 14 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 5 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | WILLIAM DWYER & MAUREEN NAUGHTON |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 04/26/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NY13523 |
| Federal ID | NY13523 |
| More Info | State Dam Safety Program |