Andover Dam Reservoir Report
Nearby: Herr Pond Dam Foster Lake Dam & Dike
Last Updated: December 6, 2025
Andover Dam, located in Allegany County, New York, was completed in 1951 and stands at a height of 9 feet with a length of 370 feet.
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Summary
The dam, primarily constructed as a Timber Crib type, serves various purposes including recreation and other activities. With a storage capacity of 294 acre-feet, Andover Dam holds a normal storage amount of 118 acre-feet and covers a surface area of 25 acres. Despite its low hazard potential and moderate risk assessment rating, the dam has not been rated for its condition.
Managed by the local government, Andover Dam is regulated by the New York State Department of Environmental Conservation (NYS DEC) and undergoes regular state inspection and enforcement. Situated on Liberty Brook in the city of Andover, the dam features an uncontrolled spillway with a width of 102 feet. While the dam has not been modified in recent years, it remains a prominent structure within the area and provides valuable water resource management for the community and recreational opportunities for visitors. For water resource and climate enthusiasts, Andover Dam represents a significant piece of infrastructure that plays a crucial role in the region's water management and environmental conservation efforts.
Year Completed |
1951 |
Dam Length |
370 |
Dam Height |
9 |
River Or Stream |
LIBERTY BROOK |
Primary Dam Type |
Timber Crib |
Surface Area |
25 |
Drainage Area |
5.47 |
Nid Storage |
294 |
Hazard Potential |
Low |
Nid Height |
9 |
Seasonal Comparison
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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.
Andover Dam