Tannenbaum Reservoir Dam Reservoir Report
Last Updated: December 6, 2025
Tannenbaum Reservoir Dam, also known as Spruce Lake, is a private dam located in Ellicottville, New York.
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Summary
Built in 2006, this earth dam stands at a height of 31 feet and has a length of 3000 feet, providing a storage capacity of 220 acre-feet. The dam's primary purpose is for recreation and other uses, with a normal storage capacity of 190 acre-feet and a surface area of 12.6 acres.
Managed by the New York State Department of Environmental Conservation, the Tannenbaum Reservoir Dam is regulated, inspected, and enforced by state authorities. Its high hazard potential is coupled with a satisfactory condition assessment as of December 2019. In the event of an emergency, the dam is subject to an Emergency Action Plan (EAP) which was last revised in January 2021.
Surrounded by the picturesque landscapes of Cattaraugus County, this dam serves as a vital resource for water storage and recreational activities in the region. With its moderate risk assessment and ongoing risk management measures, the Tannenbaum Reservoir Dam remains a key infrastructure for water resource and climate enthusiasts to explore and appreciate in the heart of New York's natural beauty.
Year Completed |
2006 |
Dam Length |
3000 |
Dam Height |
31 |
Primary Dam Type |
Earth |
Surface Area |
12.6 |
Nid Storage |
220 |
Hazard Potential |
High |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Allegheny River At Salamanca Ny
|
1540cfs |
Cattaraugus Creek At Gowanda Ny
|
490cfs |
Allegheny River At Eldred
|
473cfs |
Chadakoin River At Falconer Ny
|
64cfs |
Conewango Creek At Russell
|
822cfs |
Oswayo Creek At Shinglehouse
|
60cfs |
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.
Tannenbaum Reservoir Dam