Tivoli Lake Dam Reservoir Report
Nearby: Tivoli Lake Spillway Potake Lake Dam
Last Updated: December 7, 2025
Tivoli Lake Dam, also known as Cranberry Pond, is a private dam located in Sloatsburg, New York, along the TR-RAMAPO River.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1908, this concrete buttress dam stands at 29 feet high and spans 140 feet in length. With a storage capacity of 1,100 acre-feet, this dam primarily serves for recreation purposes, including water supply. Despite its historical significance, recent assessments have labeled its condition as poor, signaling a need for maintenance and potential improvements.
The dam's uncontrolled spillway, measuring 205 feet wide, poses a high hazard potential, prompting regular inspections every two years. The New York State Department of Environmental Conservation regulates and inspects the dam, ensuring compliance with safety standards. The surrounding area boasts a surface area of 103 acres and a drainage area of 2.36 square miles, making it a vital component of the local ecosystem. With a moderate risk assessment rating of 3, stakeholders must prioritize risk management measures to mitigate potential hazards and safeguard the community and environment.
As a key feature along the TR-RAMAPO River, Tivoli Lake Dam exemplifies the intersection of water resource management and recreational enjoyment. Its rich history and role in the local landscape underscore the importance of maintaining and enhancing its infrastructure. By addressing its current poor condition and implementing necessary risk management measures, the dam can continue to provide valuable services while ensuring the safety and well-being of all those who benefit from its presence.
Year Completed |
1908 |
Dam Length |
140 |
Dam Height |
29 |
River Or Stream |
TR-RAMAPO RIVER |
Primary Dam Type |
Concrete |
Surface Area |
103 |
Drainage Area |
2.36 |
Nid Storage |
1100 |
Hazard Potential |
High |
Nid Height |
29 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Tivoli Lake Dam
Greenwood Lk At Awosting Nj
Wanaque Reservoir At Wanaque Nj
Ringwood-Ramapo Trail Ringwood
Dater Mountain Nature County Park
Ringwood State Park
Baseball Field Lighting
Commodore Perry Field
Continental Soldiers Park