Massapequa Lake Dam Reservoir Report
Last Updated: January 2, 2026
The Massapequa Lake Dam in Massapequa, New York, serves as a crucial water resource for the area, with a primary purpose of recreation.
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Summary
Completed in 1890, this earth dam stands at a height of 11 feet and a length of 350 feet, creating a reservoir with a storage capacity of 141 acre-feet. The dam is located on the Massapequa Creek and is under the jurisdiction and regulation of the New York State Department of Environmental Conservation.
Despite being rated as having a low hazard potential and not having a current condition assessment, the dam has been deemed to pose a moderate risk. With an uncontrolled spillway and a width of 12 feet, the Massapequa Lake Dam is a vital structure that requires ongoing attention and maintenance to ensure the safety of the surrounding community and the preservation of the water resource. Although the last inspection was conducted in 1997, the dam's risk management measures and emergency action plans are unclear, highlighting the need for updated assessments and preparedness in the face of changing climate conditions.
Year Completed |
1890 |
Dam Length |
350 |
Dam Height |
11 |
River Or Stream |
MASSAPEQUA CREEK |
Primary Dam Type |
Earth |
Surface Area |
38 |
Nid Storage |
141 |
Hazard Potential |
Low |
Nid Height |
11 |
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.
Massapequa Lake Dam
Milburn Creek Boat Launch