Pine Grove Lake Dam
Pine Grove Lake Dam is an earth dam located in Rockland County, New York, built in 1968. It carries a High hazard potential classification and has a poor condition assessment.
About Pine Grove Lake Dam
The primary purpose of Pine Grove Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Association Of Property Owners At Pine Grove (private). It impounds the Tr-ramapo River near Sloatsburg.
The dam stands 12 feet tall and stretches 335 feet across, creates a reservoir covering 5 acres, and has a maximum storage capacity of 26 acre-feet. Completed in 1968, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 04/16/2025.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The New York dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | New York |
| County | Rockland |
| Nearest City | Sloatsburg |
| River/Stream | Tr-ramapo River |
| Coordinates | 41.16000, -74.17778 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 335 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 26 acre-ft |
| Max Storage | 26 acre-ft |
| Normal Storage | 16 acre-ft |
| Surface Area | 5 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | ASSOCIATION OF PROPERTY OWNERS AT PINE GROVE |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 04/16/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY13266 |
| Federal ID | NY13266 |
| More Info | State Dam Safety Program |