Lake Isaac Dam Reservoir Report
Last Updated: December 5, 2025
Lake Isaac Dam, located in Frederick, Virginia, is a privately owned structure that serves as a recreational spot for water resource and climate enthusiasts.
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Summary
Situated on Isaacs Creek, this earth dam stands at 39 feet high and stretches 393 feet in length, with a storage capacity of 424 acre-feet. Despite its impressive size, the dam is classified as having a high hazard potential but is currently in satisfactory condition, as of the last inspection in July 2020.
Managed by the Department of Conservation and Recreation, Lake Isaac Dam is regulated and inspected by the state of Virginia to ensure its safety and compliance with regulations. The dam's primary purpose is for recreation, offering visitors a serene environment for activities such as boating, fishing, and wildlife observation. With a surface area of 20 acres and a drainage area of 2.85 square miles, the dam provides a valuable resource for both locals and tourists to enjoy.
While the dam has not undergone any significant modifications or improvements in recent years, its emergency action plan is up to date, with a satisfactory risk assessment in place. Despite its high hazard potential, Lake Isaac Dam continues to stand as a reliable and well-maintained structure, reflecting the commitment to safety and preservation of water resources in the region. For water resource and climate enthusiasts, this dam represents a harmonious blend of recreation and conservation efforts in the heart of Virginia.
Dam Length |
393 |
Dam Height |
39 |
River Or Stream |
Isaacs Creek |
Primary Dam Type |
Earth |
Surface Area |
20 |
Hydraulic Height |
39 |
Drainage Area |
2.85 |
Nid Storage |
424 |
Structural Height |
39 |
Hazard Potential |
High |
Nid Height |
39 |
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.
Lake Isaac Dam
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