John Hart Dam Reservoir Report

Last Updated: December 5, 2025

John Hart Dam in Grayson, Virginia, is a state-regulated structure managed by the Department of Conservation and Recreation.


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Summary

Standing at a height of 29 feet, the dam has a maximum storage capacity of 29.35 acre-feet and a normal storage of 24 acre-feet. With a surface area of 2.5 acres, the dam plays a crucial role in water resource management in the area.

Although the hazard potential of the dam is currently undetermined and its condition is not rated, it undergoes regular inspections with a frequency of once a year. The Emergency Action Plan status and risk assessment for the dam are yet to be determined. Despite these uncertainties, the dam serves as an important infrastructure in the region, highlighting the intersection of water resource management and climate resilience.

As a key structure in Congressional District 09, Virginia, John Hart Dam symbolizes the importance of effective dam management in mitigating water-related risks. While the specific purposes and types of the dam are not listed, its presence underscores the need for ongoing monitoring and maintenance to ensure the safety and sustainability of water resources in the area.

Dam Height

29

Surface Area

2.5

Hydraulic Height

29

Nid Storage

29.35

Structural Height

29

Hazard Potential

Undetermined

Nid Height

29
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.