Evans Pond Dam Reservoir Report

Last Updated: December 5, 2025

Evans Pond Dam is a privately owned structure located in Loudoun, Virginia, serving as a critical water supply source for the surrounding area.


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Summary

Standing at a height of 18 feet with a length of 206 feet, the earth-type dam regulates an un-named tributary to the Potomac River, providing a storage capacity of 69.6 acre-feet. Despite being under state regulation and inspection, the dam's hazard potential and condition assessment remain undetermined and not rated, respectively.

With its primary purpose being water supply, Evans Pond Dam also offers recreational opportunities in addition to its essential role in ensuring water availability. Situated within the Baltimore District of the US Army Corps of Engineers, the dam plays a crucial part in managing water resources and maintaining a stable water supply for the region. While the dam's emergency action plan and risk assessment details are yet to be fully developed, its significance in water resource management and climate adaptation efforts cannot be undermined.

As water resource and climate enthusiasts continue to monitor and assess infrastructure like Evans Pond Dam, its role in safeguarding water supply and enhancing resilience to changing climate conditions becomes increasingly important. With ongoing state regulation and inspection, the dam represents a vital asset in ensuring water security and environmental sustainability in the Loudoun, Virginia region.

Dam Length

206

Dam Height

18

River Or Stream

Un-named tributary to Potomac River

Primary Dam Type

Earth

Surface Area

6.7

Hydraulic Height

18

Nid Storage

69.6

Structural Height

18

Hazard Potential

Undetermined

Nid Height

18
       
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.