Sherwood Allen Pond Dam Reservoir Report
Nearby: Pine Lake Dam Beaver Lake Dam
Last Updated: December 28, 2025
Sherwood Allen Pond Dam, located in Mamakating Park, New York, is a private dam that serves primarily for recreation purposes.
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Summary
Constructed in 1963, this earth dam stands at a height of 8 feet and spans a length of 720 feet, with a storage capacity of 236 acre-feet. The dam overlooks the South Brook river and has a spillway width of 35 feet, making it a vital structure for water resource management and flood control in the area.
Despite being classified as having a low hazard potential, Sherwood Allen Pond Dam is regulated by the New York State Department of Environmental Conservation (NYS DEC) and undergoes regular inspections, with the last one conducted in August 2012. The dam's risk assessment is considered moderate, highlighting the importance of ongoing monitoring and management to ensure its structural integrity and safety. With its picturesque location and significant role in water storage and management, Sherwood Allen Pond Dam is a notable feature in the Sullivan County landscape, appealing to water resource and climate enthusiasts alike.
Year Completed |
1963 |
Dam Length |
720 |
Dam Height |
8 |
River Or Stream |
SOUTH BROOK |
Primary Dam Type |
Earth |
Surface Area |
58 |
Drainage Area |
0.6 |
Nid Storage |
236 |
Hazard Potential |
Low |
Nid Height |
8 |
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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.
Sherwood Allen Pond Dam
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