Rockville Lake Dam Reservoir Report
Nearby: Caneadea Dam Bomac Lake Dam
Last Updated: December 6, 2025
Rockville Lake Dam, located in Belfast, New York, is a vital water resource that serves the primary purpose of recreation.
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Summary
Completed in 1977, this earth dam stands at a height of 12 feet and spans 1000 feet in length, with a storage capacity of 219 acre-feet. The dam overlooks the picturesque Black Creek, offering a serene backdrop for outdoor enthusiasts and nature lovers alike.
Despite its low hazard potential, Rockville Lake Dam is subject to state regulation, inspection, and enforcement by the NYS DEC. The dam's spillway, with a width of 40 feet, is uncontrolled and capable of handling a maximum discharge of 200 cubic feet per second. The surrounding area boasts a surface area of 27 acres and a drainage area of 24.3 square miles, making it a significant water management system in Allegany County.
With a moderate risk assessment rating of 3, Rockville Lake Dam continues to be a focal point for water resource and climate enthusiasts. While the dam's condition remains unrated, its role in providing recreational opportunities and managing water flow in the region underscores its importance in the local ecosystem. As a key feature of the Buffalo District and a symbol of responsible water management, Rockville Lake Dam stands as a testament to the balance between human recreation and environmental stewardship.
Year Completed |
1977 |
Dam Length |
1000 |
Dam Height |
12 |
River Or Stream |
BLACK CREEK |
Surface Area |
27 |
Drainage Area |
24.3 |
Nid Storage |
219 |
Hazard Potential |
Low |
Nid Height |
12 |
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.
Rockville Lake Dam