Holimont Upper Reservoir Dam Reservoir Report
Last Updated: December 6, 2025
Located in Ellicottville, New York, the Holimont Upper Reservoir Dam stands as a private structure regulated by the NYS DEC.
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Summary
Completed in 2003, this earth dam reaches a height of 35 feet and provides a storage capacity of 129 acre-feet. With a surface area of 5.5 acres, this dam plays a crucial role in water resource management in the region.
This dam serves a primary purpose of "Other" and has a high hazard potential, although its condition is currently rated as satisfactory. The last inspection in October 2019 reported no significant issues, with a regular inspection frequency of every 2 years. The dam's risk assessment is classified as high (2), emphasizing the importance of ongoing monitoring and maintenance to ensure its continued safety and effectiveness in managing water resources in the area.
With its strategic location and significant storage capacity, the Holimont Upper Reservoir Dam plays a vital role in water resource management in Cattaraugus County. As a private dam under state regulation, it highlights the importance of collaboration between private owners and regulatory agencies to ensure the safety and sustainability of water infrastructure in the region.
Year Completed |
2003 |
Dam Height |
35 |
River Or Stream |
NONE |
Primary Dam Type |
Earth |
Surface Area |
5.5 |
Nid Storage |
129 |
Hazard Potential |
High |
Nid Height |
35 |
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.
Holimont Upper Reservoir Dam