Ashbrook Dam Reservoir Report

Last Updated: December 5, 2025

Located in Loudoun, Virginia, the Ashbrook Dam is a privately owned structure designed for flood risk reduction along the Russell Branch tributary.


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Summary

Standing at a height of 20 feet with a length of 325 feet, the dam has a storage capacity of 82.4 acre-feet, providing essential protection for the surrounding area. Despite being designated as "Undetermined" in terms of hazard potential and "Not Rated" in condition assessment, the state of Virginia has regulatory oversight over the dam, ensuring regular inspections, permitting, and enforcement to maintain its safety and functionality.

Owned and operated by a private entity, Ashbrook Dam plays a crucial role in mitigating flood risks in the region. The dam's primary purpose is flood risk reduction, reflecting its importance in safeguarding the local community from potential water-related disasters. With a structure primarily composed of earth materials, the dam stands as a reliable defense against flooding events, holding back water and preserving the integrity of the surrounding landscape. Although specific details about the dam's construction date and modifications are not provided, its strategic location and design underscore its significance in water resource management.

While the Ashbrook Dam's hazard potential and condition assessment remain undetermined and not rated, respectively, the Department of Conservation and Recreation in Virginia ensures that the dam meets regulatory standards through inspections, permitting, and enforcement. The dam's storage capacity of 82.4 acre-feet, normal storage of 35.4 acre-feet, and surface area of 6.2 acres highlight its importance in flood control efforts. As a key component in the state's water infrastructure, Ashbrook Dam serves as a critical asset in protecting the local community from the impacts of extreme weather events and climate variability.

Dam Length

325

Dam Height

20

River Or Stream

Russell Branch tributary

Primary Dam Type

Earth

Surface Area

6.2

Hydraulic Height

20

Nid Storage

82.4

Structural Height

20

Hazard Potential

Undetermined

Nid Height

20
       
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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.